[go: up one dir, main page]

CN110878914B - Leakage monitoring method and device for oil and gas pipeline - Google Patents

Leakage monitoring method and device for oil and gas pipeline Download PDF

Info

Publication number
CN110878914B
CN110878914B CN201811033843.6A CN201811033843A CN110878914B CN 110878914 B CN110878914 B CN 110878914B CN 201811033843 A CN201811033843 A CN 201811033843A CN 110878914 B CN110878914 B CN 110878914B
Authority
CN
China
Prior art keywords
pressure value
monitoring substation
steady
state
monitoring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811033843.6A
Other languages
Chinese (zh)
Other versions
CN110878914A (en
Inventor
王洪超
王立坤
张弢甲
富宽
蔡永军
李在蓉
郑健峰
吴家勇
吴琼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petrochina Co Ltd
Original Assignee
Petrochina Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petrochina Co Ltd filed Critical Petrochina Co Ltd
Priority to CN201811033843.6A priority Critical patent/CN110878914B/en
Publication of CN110878914A publication Critical patent/CN110878914A/en
Application granted granted Critical
Publication of CN110878914B publication Critical patent/CN110878914B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention discloses a leakage monitoring method and device for an oil and gas pipeline, and belongs to the technical field of oil and gas storage and transportation. The method comprises the following steps: acquiring process operation information of each monitoring substation; acquiring an unsteady station-entering pressure value and an unsteady station-exiting pressure value of each monitoring substation; determining a stable station entering pressure relative value and a stable station exiting pressure relative value of the monitoring substation according to the process operation information of the monitoring substation, and the unstable station entering pressure value and the unstable station exiting pressure value of the monitoring substation; and monitoring the leakage of the oil-gas pipeline between two adjacent monitoring sub-stations according to the relative values of the steady-state entering pressure and the steady-state exiting pressure of any two adjacent monitoring sub-stations. According to the invention, the unsteady station-entering pressure value and the unsteady station-exiting pressure value are obtained, and pressure value fluctuation caused by process operation is eliminated under the unsteady working condition according to the process operation information of the oil-gas pipeline, so that leakage monitoring of the oil-gas pipeline under the unsteady working condition is realized, and the accuracy of the monitoring result is improved.

Description

Leakage monitoring method and device for oil and gas pipeline
Technical Field
The invention relates to the technical field of oil and gas storage and transportation, in particular to a leakage monitoring method and device for an oil and gas pipeline.
Background
The leakage accidents of the oil and gas pipelines occur frequently under the influence of factors such as external corrosion, accidental damage and the like, and especially some lawbreakers wantonly carry out artificial damage on the oil and gas pipelines under the drive of benefits, such as punching, oil stealing and the like, so that the behaviors greatly threaten the safe operation of the oil and gas pipelines in service. However, once the oil and gas pipeline leaks, not only huge economic loss is caused to the country, but also serious environmental pollution and casualties are caused, so that it is necessary to monitor the operation condition of the oil and gas pipeline and discover the leakage of the oil and gas pipeline in time.
In order to monitor the running condition of an oil-gas pipeline in real time, at present, most oil-gas pipelines are provided with pipeline leakage monitoring systems, and based on the pipeline leakage monitoring systems, parameters such as pressure values, flow values and the like in the oil-gas pipeline between two adjacent monitoring substations are obtained in real time by adopting methods such as a negative pressure wave method, a flow balance method and the like, so that whether the oil-gas pipeline leaks or not is determined according to the monitored parameters.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
when the oil and gas pipeline is in an unstable working condition, for example, the oil and gas pipeline is started to transport, stopped to transport, adjusted in transportation volume, distributed to transport and the like, the changes of parameters such as pressure, flow and the like in the oil and gas pipeline caused by process operation are large, and the changes of pressure, flow and the like caused by leakage of the oil and gas pipeline are covered, so that the monitoring result is inaccurate.
Disclosure of Invention
In order to eliminate the interference of normal working condition operation on a pipeline leakage monitoring system, solve the problem that the oil and gas pipeline leakage monitoring effect is poor under the unsteady working condition by the conventional methods such as a negative pressure wave and flow balance method and the like, and improve the accuracy of oil and gas pipeline leakage monitoring, the embodiment of the invention provides a leakage monitoring method and a leakage monitoring device for an oil and gas pipeline. The technical scheme is as follows:
in one aspect, a method of leak monitoring an oil and gas pipeline is provided, the method comprising:
under the unstable working condition, acquiring process operation information of each monitoring substation, wherein the process operation information is used for indicating the operation type of each monitoring substation;
acquiring an unsteady station-entering pressure value and an unsteady station-exiting pressure value of each monitoring substation;
for any monitoring substation, determining a stable-state station entering pressure relative value of the monitoring substation relative to a stable-state station exiting pressure value according to the process operation information of the monitoring substation, and the unstable-state station entering pressure value and the unstable-state station exiting pressure value of the monitoring substation;
determining a stable outbound pressure relative value of the monitoring substation relative to a stable inbound pressure value according to the process operation information of the monitoring substation, and the unstable inbound pressure value and the unstable outbound pressure value of the monitoring substation;
and monitoring the leakage of the oil-gas pipeline between two adjacent monitoring sub-stations according to the relative values of the steady-state entering pressure and the steady-state exiting pressure of any two adjacent monitoring sub-stations.
In another embodiment of the present invention, the determining a steady-state inbound pressure relative value of the monitoring substation with respect to a steady-state outbound pressure value according to the process operation information of the monitoring substation, the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation includes:
when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, acquiring the sum of an unsteady-state inbound pressure value and an unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, taking the first pressure value as the sum of a steady-state outbound pressure value and a steady-state inbound pressure value of the monitoring substation, and processing the first pressure value by taking the steady-state outbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state inbound pressure relative value of the monitoring substation;
and when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state entry pressure value and the unsteady-state exit pressure value of the monitoring substation to obtain a second pressure value, taking the second pressure value as the difference between the steady-state entry pressure value and the steady-state exit pressure value of the monitoring substation, and processing the second pressure value by taking the steady-state exit pressure value of the monitoring substation as a reference pressure value to obtain a steady-state entry pressure relative value of the monitoring substation.
In another embodiment of the present invention, the determining a steady-state outbound pressure relative value of the monitoring substation with respect to the unsteady-state inbound pressure value according to the process operation information of the monitoring substation, the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation includes:
when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, acquiring the sum of an unsteady-state inbound pressure value and an unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, taking the first pressure value as the sum of a steady-state outbound pressure value and a steady-state inbound pressure value of the monitoring substation, and processing the first pressure value by taking the steady-state inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state outbound pressure relative value of the monitoring substation;
and when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state outbound pressure value and the unsteady-state inbound pressure value of the monitoring substation to obtain a third pressure value, taking the third pressure value as the difference between the steady-state outbound pressure value and the steady-state inbound pressure value of the monitoring substation, and processing the third pressure value by taking the steady-state inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state outbound pressure relative value of the monitoring substation.
In another embodiment of the present invention, the monitoring leakage of the oil and gas pipeline between two adjacent monitoring substations according to the relative values of the steady-state inbound pressure and the steady-state outbound pressure of any two adjacent monitoring substations includes:
acquiring a steady-state outbound pressure relative value of a first monitoring substation within a preset time length and a steady-state inbound pressure relative value of a second monitoring substation within the preset time length, wherein the first monitoring substation and the second monitoring substation are two adjacent monitoring substations, and the first monitoring substation is a last monitoring substation of the second monitoring substation;
and if the descending value of the steady-state outbound pressure relative value of the first monitoring substation in the preset time length exceeds a preset threshold value and the descending value of the steady-state inbound pressure relative value of the second monitoring substation in the preset time length exceeds the preset threshold value, determining that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks.
In another embodiment of the present invention, after determining that a leakage occurs in the oil and gas pipeline between the first monitoring substation and the second monitoring substation, the method further includes:
acquiring first inflection point time when a steady-state outbound pressure relative value of the first monitoring substation begins to decline;
acquiring second inflection point time when the steady-state station-entering pressure relative value of the second monitoring substation begins to decline;
acquiring a time difference between the first inflection point time and the second inflection point time;
and determining the leakage position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation according to the time difference.
In another aspect, a leak monitoring device for an oil and gas pipeline is provided, the device comprising:
the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring process operation information of each monitoring substation under an unstable working condition, and the process operation information is used for indicating the operation type of each monitoring substation;
the acquisition module is used for acquiring the unsteady inbound pressure value and the unsteady outbound pressure value of each monitoring substation;
the determining module is used for determining a stable station entering pressure relative value of the monitoring substation relative to a stable station exiting pressure value according to the process operation information of the monitoring substation, the unstable station entering pressure value and the unstable station exiting pressure value of the monitoring substation;
the determining module is used for determining a stable-state outbound pressure relative value of the monitoring substation relative to a stable-state inbound pressure value according to the process operation information of the monitoring substation, and the unstable-state inbound pressure value and the unstable-state outbound pressure value of the monitoring substation;
and the monitoring module is used for monitoring the leakage of the oil and gas pipeline between two adjacent monitoring sub-stations according to the relative values of the steady-state station-entering pressure and the steady-state station-exiting pressure of any two adjacent monitoring sub-stations.
In another embodiment of the present invention, the determining module is configured to, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, obtain a sum of an unsteady inbound pressure value and an unsteady outbound pressure value of the monitoring substation to obtain a first pressure value, use the first pressure value as the sum of a steady outbound pressure value and a steady inbound pressure value of the monitoring substation, and use the steady outbound pressure value of the monitoring substation as a reference pressure value to process the first pressure value to obtain a steady inbound pressure relative value of the monitoring substation; and when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state entry pressure value and the unsteady-state exit pressure value of the monitoring substation to obtain a second pressure value, taking the second pressure value as the difference between the steady-state entry pressure value and the steady-state exit pressure value of the monitoring substation, and processing the second pressure value by taking the steady-state exit pressure value of the monitoring substation as a reference pressure value to obtain a steady-state entry pressure relative value of the monitoring substation.
In another embodiment of the present invention, the determining module is configured to, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, obtain a sum of an unsteady inbound pressure value and an unsteady outbound pressure value of the monitoring substation to obtain a first pressure value, use the first pressure value as the sum of a steady outbound pressure value and a steady inbound pressure value of the monitoring substation, and use the steady inbound pressure value of the monitoring substation as a reference pressure value to process the first pressure value to obtain a steady outbound pressure relative value of the monitoring substation; and when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state outbound pressure value and the unsteady-state inbound pressure value of the monitoring substation to obtain a third pressure value, taking the third pressure value as the difference between the steady-state outbound pressure value and the steady-state inbound pressure value of the monitoring substation, and processing the third pressure value by taking the steady-state inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state outbound pressure relative value of the monitoring substation.
In another embodiment of the present invention, the monitoring module is configured to obtain a steady-state outbound pressure relative value of a first monitoring substation within a preset time period and a steady-state inbound pressure relative value of a second monitoring substation within the preset time period, where the first monitoring substation and the second monitoring substation are two adjacent monitoring substations, and the first monitoring substation is a last monitoring substation of the second monitoring substation; and if the descending value of the steady-state outbound pressure relative value of the first monitoring substation in the preset time length exceeds a preset threshold value and the descending value of the steady-state inbound pressure relative value of the second monitoring substation in the preset time length exceeds the preset threshold value, determining that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks.
In another embodiment of the present invention, the acquiring module is configured to acquire a first inflection time at which a steady-state outbound pressure relative value of the first monitoring substation starts to decrease;
the acquisition module is used for acquiring a second inflection point time when the steady-state station entering pressure relative value of the second monitoring substation begins to decline;
the obtaining module is configured to obtain a time difference between the first inflection time and the second inflection time;
and the determining module is used for determining the leakage position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation according to the time difference.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the unsteady inbound pressure value and the unsteady outbound pressure value are obtained, pressure value fluctuation caused by process operation is eliminated under the unsteady working condition according to the process operation information of the oil-gas pipeline, leakage monitoring of the oil-gas pipeline under the unsteady working condition is achieved, and accuracy of a monitoring result is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a system for monitoring leakage from a pipeline according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for monitoring leakage of an oil and gas pipeline provided by an embodiment of the invention;
FIG. 3 is a flow chart of a method for monitoring leakage of an oil and gas pipeline provided by an embodiment of the invention;
FIG. 4 is a waveform illustrating an upstream inbound pressure according to an embodiment of the present invention;
FIG. 5 is a waveform diagram of an upstream outbound pressure provided by an embodiment of the present invention;
FIG. 6 is a waveform diagram of a filtered upstream outbound pressure provided by an embodiment of the present invention;
FIG. 7 is a waveform illustrating downstream inbound pressure during a steady state condition provided by an embodiment of the present invention;
FIG. 8 is a timing diagram of a method of leak monitoring of an oil and gas pipeline provided by an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a leakage monitoring device for an oil and gas pipeline according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating an architecture of a pipe leakage monitoring system according to an embodiment of the present invention, and referring to fig. 1, the pipe leakage monitoring system includes: SCADA (Supervisory Control And Data Acquisition, monitoring And Control system) system communication terminal, monitoring substation And monitoring center station.
The SCADA system communication terminal is responsible for acquiring process operation information of the SCADA system and sending the acquired process operation information to the monitoring central station. The SCADA System is a computer-based DCS (Distributed Control System) and power automation monitoring System, has a wide application range, and can be applied to data acquisition, monitoring Control and process Control in the fields of power, metallurgy, petroleum, chemical industry, gas, railways and the like.
The monitoring substations are positioned at the positions of the oil and gas pipeline station field and part of the valve chambers, each monitoring substation comprises a pressure transmitter, a data acquisition terminal and the like and is responsible for transmitting the station-entering pressure value and the station-exiting pressure value of the station field and the valve chambers to the monitoring central station. The number of the pressure transmitters installed in the monitoring substations positioned at different positions of the pipeline leakage monitoring system is different according to the flow direction of liquid (or gas) in the oil and gas pipeline. Referring to fig. 1, for a monitoring substation located at a primary site location, typically only one pressure transmitter is installed at the outbound site; for a monitoring substation located at the end station position, a pressure transmitter is generally only installed at the station-entering position; for monitoring substations located at intermediate locations, a pressure transmitter is typically installed at each of the inbound and outbound locations.
The monitoring central station is used as a data processing terminal, is generally arranged in a dispatching room and is responsible for acquiring process operation information of the SCADA system and pressure data of each monitoring substation, and determining whether the oil and gas pipeline leaks or not and automatically positioning and alarming by analyzing the process operation information and the pressure data.
The embodiment of the invention provides a leakage monitoring method of an oil and gas pipeline, which is applied to a pipeline leakage monitoring system shown in figure 1, and referring to figure 2, the method provided by the embodiment of the invention comprises the following steps:
201. and under the unstable working condition, acquiring the process operation information of each monitoring substation.
Wherein the process operation information is used to indicate the operation type of each monitoring substation.
202. And acquiring the unsteady inbound pressure value and the unsteady outbound pressure value of each monitoring substation.
203. And for any monitoring substation, determining a stable-state station-entering pressure relative value of the monitoring substation relative to the stable-state station-exiting pressure value according to the process operation information of the monitoring substation, and the unstable-state station-entering pressure value and the unstable-state station-exiting pressure value of the monitoring substation.
204. And determining a stable-state outbound pressure relative value of the monitoring substation relative to the stable-state inbound pressure value according to the process operation information of the monitoring substation, the unstable-state inbound pressure value and the unstable-state outbound pressure value of the monitoring substation.
205. And monitoring the leakage of the oil-gas pipeline between two adjacent monitoring sub-stations according to the relative values of the steady-state entering pressure and the steady-state exiting pressure of any two adjacent monitoring sub-stations.
According to the method provided by the embodiment of the invention, the unsteady-state inbound pressure value and the unsteady-state outbound pressure value are obtained, and pressure value fluctuation caused by process operation is eliminated under the unsteady working condition according to the process operation information of the oil-gas pipeline, so that leakage monitoring of the oil-gas pipeline under the unsteady working condition is realized, and the accuracy of the monitoring result is improved.
In another embodiment of the present invention, determining a steady-state entering pressure relative value of the monitoring substation with respect to a steady-state exiting pressure value according to the process operation information of the monitoring substation, the unsteady-state entering pressure value and the unsteady-state exiting pressure value of the monitoring substation includes:
when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, acquiring the sum of an unsteady-state inbound pressure value and an unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, taking the first pressure value as the sum of a steady-state outbound pressure value and a steady-state inbound pressure value of the monitoring substation, and processing the first pressure value by taking the steady-state outbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state inbound pressure relative value of the monitoring substation;
and when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation to obtain a second pressure value, taking the second pressure value as the difference between the steady-state inbound pressure value and the steady-state outbound pressure value of the monitoring substation, and processing the second pressure value by taking the steady-state outbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state inbound pressure relative value of the monitoring substation.
In another embodiment of the present invention, determining a steady-state outbound pressure relative value of the monitoring substation with respect to a steady-state inbound pressure value according to the process operation information of the monitoring substation, the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation includes:
when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, acquiring the sum of an unsteady-state inbound pressure value and an unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, taking the first pressure value as the sum of a steady-state outbound pressure value and a steady-state inbound pressure value of the monitoring substation, and processing the first pressure value by taking the steady-state inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state outbound pressure relative value of the monitoring substation;
and when the operation type indicated by the process operation information of the monitoring substation is the second type of operation, acquiring the difference between the unsteady outbound pressure value and the unsteady inbound pressure value of the monitoring substation to obtain a third pressure value, taking the third pressure value as the difference between the steady outbound pressure value and the steady inbound pressure value of the monitoring substation, and processing the third pressure value by taking the steady inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady outbound pressure relative value of the monitoring substation.
In another embodiment of the present invention, monitoring leakage of an oil and gas pipeline between two adjacent monitoring substations according to a steady-state inbound pressure relative value and a steady-state outbound pressure relative value of any two adjacent monitoring substations comprises:
acquiring a steady-state outbound pressure relative value of a first monitoring substation within a preset time length and a steady-state inbound pressure relative value of a second monitoring substation within the preset time length, wherein the first monitoring substation and the second monitoring substation are two adjacent monitoring substations, and the first monitoring substation is a last monitoring substation of the second monitoring substation;
and if the descending value of the steady-state outbound pressure relative value of the first monitoring substation in the preset time length exceeds the preset threshold value and the descending value of the steady-state inbound pressure relative value of the second monitoring substation in the preset time length exceeds the preset threshold value, determining that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks.
In another embodiment of the present invention, after determining that a leakage occurs in the oil and gas pipeline between the first monitoring substation and the second monitoring substation, the method further comprises:
acquiring first inflection point time when a steady-state outbound pressure relative value of a first monitoring substation begins to decline;
acquiring a second inflection point time when the steady-state station-entering pressure relative value of the second monitoring substation begins to decline;
acquiring a time difference between a first inflection point time and a second inflection point time;
and determining the leakage position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation according to the time difference.
All the above-mentioned optional technical solutions can be combined arbitrarily to form the optional embodiments of the present invention, and are not described herein again.
The embodiment of the invention provides a leakage monitoring method for an oil and gas pipeline, which is applied to a pipeline leakage monitoring system shown in fig. 1, and takes a monitoring central station to execute the embodiment of the invention as an example, referring to fig. 3, wherein the flow of the method provided by the embodiment of the invention comprises the following steps:
301. under the unstable working condition, the monitoring central station acquires the process operation information of each monitoring substation.
In the process of oil and gas transmission, when it is monitored that each monitoring substation carries out process operation on an oil and gas pipeline, the SCADA system communication terminal acquires process operation information of each monitoring substation and sends the acquired process operation information to the monitoring central station, and the monitoring central station receives the process operation information sent by the SCADA system communication terminal and takes the received process operation information as the acquired process operation information of each monitoring substation.
Wherein, the operation types of the process operation comprise starting and stopping the transmission, regulating a valve, regulating the flow and the like. The process operation information comprises the names and the positions of the monitoring substations, the names of the process operations executed by the monitoring substations on the oil and gas pipeline and the like, and can indicate the operation type of each monitoring substation.
302. And the monitoring central station acquires the unsteady inbound pressure value and the unsteady outbound pressure value of each monitoring substation.
Under the unsteady working condition, each monitoring substation can acquire an unsteady inbound pressure value and an unsteady outbound pressure value of each monitoring substation according to the pressure transmitters arranged at the inbound and outbound positions, the acquired unsteady inbound pressure value and the unsteady outbound pressure value are further sent to the monitoring central station, and the monitoring central station receives the unsteady inbound pressure value and the unsteady outbound pressure value sent by each monitoring substation and acquires the unsteady inbound pressure value and the unsteady outbound pressure value of each monitoring substation according to the unsteady inbound pressure value and the unsteady outbound pressure value.
In order to facilitate subsequent application, when the unsteady inbound pressure value and the unsteady outbound pressure value of each monitoring substation are obtained, the monitoring central station also stores the unsteady inbound pressure value and the unsteady outbound pressure value of each monitoring substation.
303. For any monitoring substation, the monitoring central station determines a stable-state station-entering pressure relative value of the monitoring substation relative to a stable-state station-exiting pressure value according to the process operation information of the monitoring substation, the unstable-state station-entering pressure value and the unstable-state station-exiting pressure value of the monitoring substation.
Before this step is executed, the filtering processing principle adopted in the embodiment of the present invention is described:
taking any monitoring substation located in the middle position as an example, pressure transmitters are arranged on the inbound and outbound positions of the monitoring substation, based on the arranged pressure transmitters, when the process operation is carried out in the monitoring substation, the pressure fluctuation caused by the process operation is transmitted to the inbound direction and the outbound direction, and the pressure fluctuation obtained by the inbound pressure transmitter and the outbound pressure transmitter is considered to be caused by the same process operation, so that the pressure value obtained by the outbound pressure transmitter can be used as a reference signal source to eliminate the influence of the pressure fluctuation caused by the process operation on the pressure value obtained by the inbound pressure transmitter; similarly, the pressure value obtained by the inbound pressure transmitter can be used as a reference signal source to eliminate the influence of pressure fluctuation caused by process operation on the pressure value obtained by the outbound pressure transmitter. In particular, the amount of the solvent to be used,
when a process operation occurs in a monitoring substation, the process operation causes pressure fluctuations which propagate in the inbound and outbound directions, respectively, if the pressure fluctuations propagating in the inbound direction are set to Δ Pin(t) pressure fluctuation Δ P propagating in the outbound directionout(t), then under different working condition scenes, can get Δ Pin(t) and Δ PoutThe relationship between (t) is:
in the first kind of operation scene, such as the operation of a regulating valve, the pressure transmitter at the station and the pressure transmitter at the station are positioned at two sides of the regulating valve, so the delta Pin(t)＝-ΔPout(t), namely the phase of the pressure fluctuation propagated to the inbound direction is opposite to that of the pressure fluctuation propagated to the outbound direction, and the inbound pressure change value and the outbound pressure change value are in an inverse numerical relation;
in the second kind of operation, such as separate transportation, the pressure in the pipeline is reduced due to the outflow of oil product, and the pressure is delta Pin(t)＝ΔPout(t), namely the pressure fluctuation propagating towards the inbound direction has the same phase as the pressure fluctuation propagating towards the outbound direction, and the inbound pressure change value is equal to the outbound pressure change value.
In addition, when Δ P is obtainedin(t) and Δ Pout(t) before the relationship, the following two approximations need to be made:
firstly, the distance between the inbound pressure transmitter and the outbound pressure transmitter is very short, and the loss of pressure fluctuation in the process of transmitting to the inbound direction and the outbound direction is very small and can be ignored;
secondly, the time difference of the pressure fluctuation transmitted to the inbound pressure transmitter and the outbound pressure transmitter is very small and can be ignored, namely, the time difference of the pressure fluctuation received by the inbound pressure transmitter and the outbound pressure transmitter does not exist.
Based on the above two approximation conditions, the magnitude of the inbound pressure variation value and the outbound pressure variation value can be considered to be equal.
Under unsteady conditions, the unsteady pull-in pressure value can be expressed as the sum of the steady pull-in pressure value and the pull-in pressure variation value, i.e. the sum of the steady pull-in pressure value and the pull-in pressure variation value
P1 in(t)＝P0 in(t)+ΔPin(t)；
The unsteady outbound pressure value may be expressed as a sum of the steady-state outbound pressure value and the outbound pressure variation value, i.e.
P1 out(t)＝P0 out(t)+ΔPout(t)。
Wherein, P1 in(t) represents the unsteady pressure value of entering station, P0 in(t) represents a steady-state approach pressure value, P1 out(t) represents the unsteady outbound pressure value, P0 out(t) represents the steady state outbound pressure value.
According to the embodiment of the invention, the pressure value obtained by the outbound pressure transmitter is used as a reference signal source, the inbound pressure is subjected to noise reduction treatment, and the steady inbound pressure relative value can be obtained. In particular, the amount of the solvent to be used,
in the first kind of operation scene, the pressure fluctuation propagating towards the inbound direction and the pressure fluctuation propagating towards the outbound direction are opposite in phase, and the unsteady inbound pressure value expression P is used1 in(t)＝P0 in(t)+ΔPin(t) expression of unsteady outbound pressure values P1 out(t)＝P0 out(t)+ΔPout(t) adding the two sides of the equation to obtain P1 in(t)+P1 out(t)＝P0 in(t)+P0 out(t) of (d). Under the condition that the pressure value obtained by the outbound pressure transmitter is used as a reference signal, a steady-state inbound pressure relative value P can be obtainedin(t)＝P1 in(t)+P1 out(t)。
In the second kind of operation scene, because the pressure fluctuation propagating towards the inbound direction and the pressure fluctuation propagating towards the outbound direction have the same phase, the unsteady inbound pressure value expression P is used1 in(t)＝P0 in(t)+ΔPin(t) expression of unsteady outbound pressure values P1 out(t)＝P0 out(t)+ΔPoutSubtracting two ends of the equation of (t) to obtain P1 in(t)-P1 out(t)＝P0 in(t)-P0 out(t) of (d). Under the condition that the pressure value obtained by the outbound pressure transmitter is used as a reference signal, a steady-state inbound pressure relative value P can be obtainedin(t)＝P1 in(t)-P1 out(t)。
According to the embodiment of the invention, the pressure value obtained by the inbound pressure transmitter is used as a reference signal source, and the outbound pressure value is subjected to noise reduction treatment, so that the steady outbound pressure relative value can be obtained. In particular, the amount of the solvent to be used,
in the first kind of operation scene, the pressure fluctuation propagating towards the inbound direction and the pressure fluctuation propagating towards the outbound direction are opposite in phase, and the unsteady inbound pressure value expression P is used1 in(t)＝P0 in(t)+ΔPin(t) expression of unsteady outbound pressure values P1 out(t)＝P0 out(t)+ΔPout(t) adding the two sides of the equation to obtain P1 in(t)+P1 out(t)＝P0 in(t)+P0 out(t) of (d). Under the condition that the pressure value obtained by the inbound pressure transmitter is used as a reference signal, a steady-state outbound pressure relative value P can be obtainedout(t)＝P1 in(t)+P1 out(t)。
In the second kind of operation scene, because the pressure fluctuation propagating towards the inbound direction and the pressure fluctuation propagating towards the outbound direction have the same phase, the unsteady outbound pressure value expression P1 out(t)＝P0 out(t)+ΔPout(t) expression of unsteady stage-entering pressure value P1 in(t)＝P0 in(t)+ΔPinSubtracting two ends of the equation of (t) to obtain P1 out(t)-P1 in(t)＝P0 out(t)-P0 in(t) of (d). Under the condition that the pressure value obtained by the inbound pressure transmitter is used as a reference signal, the steady-state outbound can be obtainedRelative value of pressure Pout(t)＝P1 out(t)-P1 in(t)。
Based on the above, when the monitoring central station determines the steady-state entering pressure relative value of the monitoring substation relative to the steady-state exiting pressure value according to the process operation information of the monitoring substation, the unsteady-state entering pressure value and the unsteady-state exiting pressure value of the monitoring substation, the method includes, but is not limited to, the following two modes:
in a first mode, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, the monitoring central station acquires the sum of the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, the first pressure value is used as the sum of the steady-state outbound pressure value and the steady-state inbound pressure value of the monitoring substation, and the first pressure value is further processed by taking the steady-state outbound pressure value of the monitoring substation as a reference pressure value, namely the steady-state outbound pressure value of the monitoring substation is set to be 0, so that a steady-state inbound pressure relative value of the monitoring substation can be obtained.
In a second mode, when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, the monitoring central station acquires a difference between an unsteady-state inbound pressure value and an unsteady-state outbound pressure value of the monitoring substation to obtain a second pressure value, the second pressure value is used as a difference between a steady-state inbound pressure value and a steady-state outbound pressure value of the monitoring substation, and the second pressure value is processed by taking the steady-state outbound pressure value of the monitoring substation as a reference pressure value, namely the steady-state outbound pressure value of the monitoring substation is set to be 0, so that a steady-state inbound pressure relative value of the monitoring substation can be obtained.
304. And the monitoring central station determines a stable outbound pressure relative value of the monitoring substation relative to the stable inbound pressure value according to the process operation information of the monitoring substation, and the unstable inbound pressure value and the unstable outbound pressure value of the monitoring substation.
Based on the principle content shown in step 303, when the monitoring central station determines the steady-state outbound pressure relative value of the monitoring substation relative to the steady-state inbound pressure value according to the process operation information of the monitoring substation, the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation, the method includes, but is not limited to, the following two modes:
in a first mode, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, the monitoring central station acquires the sum of the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, the first pressure value is used as the sum of the steady-state outbound pressure value and the steady-state inbound pressure value of the monitoring substation, and the first pressure value is further processed by taking the steady-state inbound pressure value of the monitoring substation as a reference pressure value, namely the steady-state inbound pressure value of the monitoring substation is set to be 0, so that a steady-state outbound pressure relative value of the monitoring substation can be obtained.
In a second mode, when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, the monitoring central station acquires a difference between an unsteady outbound pressure value and an unsteady inbound pressure value of the monitoring substation to obtain a third pressure value, the third pressure value is used as a difference between a steady outbound pressure value and a steady inbound pressure value of the monitoring substation, and the third pressure value is processed by taking the steady inbound pressure value of the monitoring substation as a reference pressure value, that is, the steady inbound pressure value of the monitoring substation is set to be 0, so that a steady outbound pressure relative value of the monitoring substation can be obtained.
305. And the monitoring central station monitors the leakage of the oil and gas pipeline between the two adjacent monitoring sub-stations according to the relative values of the steady-state station-entering pressure and the steady-state station-exiting pressure of any two adjacent monitoring sub-stations, if the leakage does not exist, the step 301 is continuously executed, and if the leakage exists, the step 306 is executed.
Based on the relative steady-state inbound pressure value of each monitoring substation obtained in step 303 and the relative steady-state outbound pressure value of each monitoring substation obtained in step 304, the monitoring central station can monitor leakage of the oil and gas pipeline between two adjacent monitoring substations according to the relative steady-state inbound pressure value and the relative steady-state outbound pressure value of any two adjacent monitoring substations. The specific monitoring process can adopt steps 3051-3052:
3051. the monitoring central station acquires a steady-state outbound pressure relative value of the first monitoring substation in a preset time length and a steady-state inbound pressure relative value of the second monitoring substation in the preset time length.
The first monitoring substation and the second monitoring substation are two adjacent monitoring substations, and the first monitoring substation is the last monitoring substation of the second monitoring substation. The preset time period may be 3 minutes, 4 minutes, and the like, and the embodiment of the present invention is described by taking the preset time period as 3 minutes as an example.
3052. And if the descending value of the steady-state outbound pressure relative value of the first monitoring substation in the preset time length exceeds the preset threshold value and the descending value of the steady-state inbound pressure relative value of the second monitoring substation in the preset time length exceeds the preset threshold value, determining that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks.
The preset threshold value can be determined according to the monitoring precision of the monitoring central station. The monitoring central station compares the descending value of the steady-state outbound pressure relative value of the first monitoring substation within a preset time period with a preset threshold value, compares the descending value of the steady-state inbound pressure relative value of the second monitoring substation within the preset time period with the preset threshold value, if the descending value is greater than the preset threshold value at the same time, the monitoring central station determines that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks, and executes step 306 to position the leakage position, so as to automatically position and alarm; and if the leakage is not larger than the preset threshold value simultaneously, the monitoring central station determines that the oil-gas pipeline between the first monitoring substation and the second monitoring substation is not leaked, and executes the step 301, so that the leakage monitoring is continuously performed on the oil-gas pipeline between the first monitoring substation and the second monitoring substation.
306. And the monitoring central station determines the leakage position of the oil and gas pipeline.
After determining that the oil gas pipeline between the first monitoring substation and the second monitoring substation leaks, the monitoring central station further determines a leakage position where the oil gas pipeline between the first monitoring substation and the second monitoring substation leaks, and specifically, the following steps can be adopted:
3061. the monitoring central station acquires a first inflection point time when the steady-state outbound pressure relative value of the first monitoring substation begins to decline.
In the embodiment of the invention, each monitoring substation acquires a steady-state outbound pressure relative value with the length of 3 minutes, calculates a difference value between the steady-state outbound pressure relative value within 3 minutes and a first pressure value within 3 minutes in sequence, and records the acquisition time which is greater than a preset threshold value for the first time as a first inflection point time if the difference value is greater than the preset threshold value.
3062. And the monitoring central station acquires a second inflection point time when the steady-state station-entering pressure relative value of the second monitoring substation begins to decline.
In the embodiment of the invention, each monitoring substation acquires a steady-state station-entering pressure relative value with the length of 3 minutes, calculates a difference value between the steady-state station-entering pressure relative value within 3 minutes and a first pressure value within 3 minutes in sequence, and records the acquisition time which is greater than a preset threshold value for the first time as the second inflection time if the difference value is greater than the preset threshold value.
3063. And the monitoring central station acquires the time difference between the first inflection point time and the second inflection point time.
And the monitoring central station calculates the difference between the first inflection point time and the second inflection point time to obtain the time difference between the first inflection point time and the second inflection point time.
3064. And the monitoring central station determines the leakage position of the oil-gas pipeline between the first monitoring substation and the second monitoring substation according to the time difference.
The monitoring central station may determine a distance between the leak location and the first monitoring sub-station and the second monitoring sub-station according to a time difference between the first inflection time and the second inflection time. The method specifically comprises the following three conditions:
in the first case, if the time difference is zero, it is determined that the leak location is at the central location of the oil and gas pipeline between the first monitoring sub-station and the second monitoring sub-station.
And in the second situation, if the time difference is a positive value, the leakage position is close to the second monitoring substation, and the specific leakage position is determined according to the time difference and the propagation speed of the pressure wave in the oil and gas pipeline. For example, if the first time is 10:00:30 and the second time is 10:00:00, the time difference between the first time and the second time is 30 seconds, and the propagation speed of the pressure wave in the oil and gas pipeline is set to be 340 m/s, the position of the leak can be determined to be close to the second monitoring substation, and the distance from the central position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation is 340 m/s 30/2-5100 m.
And in the third situation, if the time difference is a negative value, the leakage position is close to the first monitoring substation, and then the specific leakage position is determined according to the time difference and the propagation speed of the pressure wave in the oil and gas pipeline. For example, if the first acquisition time is 08:00:00 and the second acquisition time is 08:00:10, the time difference between the first acquisition time and the second acquisition time is-10 seconds, and the propagation speed of the pressure wave in the oil and gas pipeline is set to 340 m/s, it can be determined that the leakage position is close to the first monitoring substation, and the distance from the central position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation is 340 m/s 10/2-1700 m.
In order to test the monitoring accuracy of the leakage monitoring method of the oil and gas pipeline provided by the embodiment of the invention, the oil and gas pipeline leakage is simulated by discharging oil on the oil and gas pipeline with the length of 61.2km, and the distance between the selected oil discharging test point and the upstream monitoring substation is 40.53 km. During testing, the upstream monitoring substation performs valve operation, based on pressure fluctuation caused by the valve operation, fig. 4 is an inbound pressure waveform diagram of the upstream monitoring substation, fig. 5 is an outbound pressure waveform diagram of the upstream monitoring substation, and by analyzing fig. 4 and 5, it can be seen that large pressure fluctuation is caused at both inbound and outbound positions due to the valve operation, and the pressure fluctuation caused by oil and gas pipeline leakage is not obvious. Fig. 6 is an outbound pressure waveform diagram of the upstream monitoring substation after filtering, and pressure fluctuation caused by valve operation is filtered out by filtering the outbound pressure waveform diagram of the upstream monitoring substation, so that the pressure fluctuation caused by leakage is obvious. Fig. 7 is a waveform diagram of inbound pressure acquired by the downstream monitoring substation when no process operation is performed, and by analyzing fig. 6 and 7, it can be seen that 3 inflection points (wave troughs) exist in the waveform diagrams of fig. 6 and 7, so that it can be determined that 3 times of oil and gas pipeline leakage (oil drain test) occurs between the upstream monitoring substation and the downstream monitoring substation, and according to the time difference of pressure change during each oil and gas pipeline leakage, the leakage position of each oil and gas pipeline is determined, and by calculating the average value of the leakage positions of the 3 times of oil and gas pipelines, the distance between the leakage position and the upstream monitoring substation can be located to be 40.3km, and the error between the test result and the actual leakage position is only 200 m.
In order to facilitate understanding of the method for monitoring leakage of an oil and gas pipeline provided by the embodiment of the present invention, fig. 8 is taken as an example for description.
Referring to fig. 8, in the process of monitoring the oil and gas pipeline, the monitoring central station acquires unsteady state pressure data and process operation information of each monitoring substation in real time, determines a filtering mode for the unsteady state pressure data according to an operation type indicated by the process operation information, performs filtering processing on the unsteady state pressure data of each monitoring substation based on the determined filtering mode to obtain steady state pressure relative data of each monitoring substation, further determines whether the oil and gas pipeline between two adjacent monitoring substations leaks according to the acquired steady state pressure relative data of each monitoring substation, and determines a leakage position by calculating a time difference between upstream and downstream pressure drop inflection points.
According to the method provided by the embodiment of the invention, the unsteady-state inbound pressure value and the unsteady-state outbound pressure value are obtained, and pressure value fluctuation caused by process operation is eliminated under the unsteady working condition according to the process operation information of the oil-gas pipeline, so that leakage monitoring of the oil-gas pipeline under the unsteady working condition is realized, and the accuracy of the monitoring result is improved.
Referring to fig. 9, an embodiment of the present invention provides a leakage monitoring apparatus for an oil and gas pipeline, the apparatus comprising:
an obtaining module 901, configured to obtain, under an unstable working condition, process operation information of each monitoring substation, where the process operation information is used to indicate an operation type of each monitoring substation;
an obtaining module 901, configured to obtain an unsteady inbound pressure value and an unsteady outbound pressure value of each monitoring substation;
a determining module 902, configured to determine, for any monitoring substation, a stable-state entry pressure relative value of the monitoring substation with respect to a stable-state exit pressure value according to process operation information of the monitoring substation, the unstable-state entry pressure value and the unstable-state exit pressure value of the monitoring substation;
a determining module 902, configured to determine a steady-state outbound pressure relative value of the monitoring substation with respect to a steady-state inbound pressure value according to the process operation information of the monitoring substation, the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation;
and the monitoring module 903 is used for monitoring the leakage of the oil and gas pipeline between any two adjacent monitoring substations according to the relative values of the steady-state station-entering pressure and the steady-state station-exiting pressure of any two adjacent monitoring substations.
In another embodiment of the present invention, the determining module 902 is configured to, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, obtain a sum of an unsteady inbound pressure value and an unsteady outbound pressure value of the monitoring substation to obtain a first pressure value, use the first pressure value as the sum of a steady outbound pressure value and a steady inbound pressure value of the monitoring substation, and process the first pressure value with the steady outbound pressure value of the monitoring substation as a reference pressure value to obtain a steady inbound pressure relative value of the monitoring substation; and when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state inbound pressure value and the unsteady-state outbound pressure value of the monitoring substation to obtain a second pressure value, taking the second pressure value as the difference between the steady-state inbound pressure value and the steady-state outbound pressure value of the monitoring substation, and processing the second pressure value by taking the steady-state outbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state inbound pressure relative value of the monitoring substation.
In another embodiment of the present invention, the determining module 902 is configured to, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, obtain a sum of an unsteady inbound pressure value and an unsteady outbound pressure value of the monitoring substation to obtain a first pressure value, use the first pressure value as the sum of a steady outbound pressure value and a steady inbound pressure value of the monitoring substation, and process the first pressure value with the steady inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady outbound pressure relative value of the monitoring substation; and when the operation type indicated by the process operation information of the monitoring substation is the second type of operation, acquiring the difference between the unsteady outbound pressure value and the unsteady inbound pressure value of the monitoring substation to obtain a third pressure value, taking the third pressure value as the difference between the steady outbound pressure value and the steady inbound pressure value of the monitoring substation, and processing the third pressure value by taking the steady inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady outbound pressure relative value of the monitoring substation.
In another embodiment of the present invention, the monitoring module 903 is configured to obtain a steady-state outbound pressure relative value of the first monitoring substation within a preset time period and a steady-state inbound pressure relative value of the second monitoring substation within the preset time period, where the first monitoring substation and the second monitoring substation are two adjacent monitoring substations, and the first monitoring substation is a previous monitoring substation of the second monitoring substation; and if the descending value of the steady-state outbound pressure relative value of the first monitoring substation in the preset time length exceeds the preset threshold value and the descending value of the steady-state inbound pressure relative value of the second monitoring substation in the preset time length exceeds the preset threshold value, determining that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks.
In another embodiment of the present invention, the obtaining module 901 is configured to obtain a first inflection time at which a steady-state outbound pressure relative value of the first monitoring substation starts to decrease;
an obtaining module 901, configured to obtain a second inflection time at which a steady-state station entering pressure relative value of the second monitoring substation starts to decrease;
an obtaining module 901, configured to obtain a time difference between a first inflection time and a second inflection time;
and a determining module 902, configured to determine, according to the time difference, a leakage position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation.
In summary, the device provided by the embodiment of the invention obtains the unsteady-state inbound pressure value and the unsteady-state outbound pressure value, and eliminates pressure value fluctuation caused by process operation under the unsteady-state working condition according to the process operation information of the oil-gas pipeline, thereby realizing leakage monitoring of the oil-gas pipeline under the unsteady-state working condition and improving the accuracy of the monitoring result.
It should be noted that: when the leakage monitoring device for the oil and gas pipeline provided by the embodiment carries out leakage monitoring on the oil and gas pipeline, the division of the functional modules is only used for illustration, in practical application, the function distribution can be completed by different functional modules according to needs, that is, the internal structure of the leakage monitoring device for the oil and gas pipeline is divided into different functional modules, so that all or part of the functions described above can be completed. In addition, the leakage monitoring device of the oil and gas pipeline and the leakage monitoring method embodiment of the oil and gas pipeline provided by the embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment and is not repeated herein.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (4)

1. A method of leak monitoring an oil and gas pipeline, the method comprising:
under the unstable working condition, acquiring process operation information of each monitoring substation, wherein the process operation information is used for indicating the operation type of each monitoring substation;
acquiring an unsteady station-entering pressure value and an unsteady station-exiting pressure value of each monitoring substation;
for any monitoring substation, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, acquiring the sum of an unsteady-state inbound pressure value and an unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, taking the first pressure value as the sum of a steady-state outbound pressure value and a steady-state inbound pressure value of the monitoring substation, and processing the first pressure value by taking the steady-state outbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state inbound pressure relative value of the monitoring substation; when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state entry pressure value and the unsteady-state exit pressure value of the monitoring substation to obtain a second pressure value, taking the second pressure value as the difference between the steady-state entry pressure value and the steady-state exit pressure value of the monitoring substation, and processing the second pressure value by taking the steady-state exit pressure value of the monitoring substation as a reference pressure value to obtain a steady-state entry pressure relative value of the monitoring substation;
when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, acquiring the sum of an unsteady-state inbound pressure value and an unsteady-state outbound pressure value of the monitoring substation to obtain a first pressure value, taking the first pressure value as the sum of a steady-state outbound pressure value and a steady-state inbound pressure value of the monitoring substation, and processing the first pressure value by taking the steady-state inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady-state outbound pressure relative value of the monitoring substation; when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady outbound pressure value and the unsteady inbound pressure value of the monitoring substation to obtain a third pressure value, taking the third pressure value as the difference between the steady outbound pressure value and the steady inbound pressure value of the monitoring substation, and processing the third pressure value by taking the steady inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady outbound pressure relative value of the monitoring substation;
acquiring a steady-state outbound pressure relative value of a first monitoring substation within a preset time length and a steady-state inbound pressure relative value of a second monitoring substation within the preset time length, wherein the first monitoring substation and the second monitoring substation are two adjacent monitoring substations, and the first monitoring substation is a last monitoring substation of the second monitoring substation; if the descending value of the steady-state outbound pressure relative value of the first monitoring substation in the preset time length exceeds a preset threshold value and the descending value of the steady-state inbound pressure relative value of the second monitoring substation in the preset time length exceeds the preset threshold value, determining that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks;
wherein the first type of operation is a regulator valve operation and the second type of operation is a split delivery operation.
2. The method of claim 1, wherein after determining that a leak has occurred in the oil and gas pipeline between the first monitoring substation and the second monitoring substation, further comprising:
acquiring first inflection point time when a steady-state outbound pressure relative value of the first monitoring substation begins to decline;
acquiring second inflection point time when the steady-state station-entering pressure relative value of the second monitoring substation begins to decline;
acquiring a time difference between the first inflection point time and the second inflection point time;
and determining the leakage position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation according to the time difference.
3. A leak monitoring device for an oil and gas pipeline, the device comprising:
the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring process operation information of each monitoring substation under an unstable working condition, and the process operation information is used for indicating the operation type of each monitoring substation;
the acquisition module is used for acquiring the unsteady inbound pressure value and the unsteady outbound pressure value of each monitoring substation;
the determining module is used for acquiring the sum of an unsteady-state station-entering pressure value and an unsteady-state station-exiting pressure value of any monitoring substation when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, so as to obtain a first pressure value, taking the first pressure value as the sum of a steady-state station-exiting pressure value and a steady-state station-entering pressure value of the monitoring substation, and processing the first pressure value by taking the steady-state station-exiting pressure value of the monitoring substation as a reference pressure value, so as to obtain a steady-state station-entering pressure relative value of the monitoring substation; when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady-state entry pressure value and the unsteady-state exit pressure value of the monitoring substation to obtain a second pressure value, taking the second pressure value as the difference between the steady-state entry pressure value and the steady-state exit pressure value of the monitoring substation, and processing the second pressure value by taking the steady-state exit pressure value of the monitoring substation as a reference pressure value to obtain a steady-state entry pressure relative value of the monitoring substation;
the determining module is configured to, when the operation type indicated by the process operation information of the monitoring substation is a first type of operation, obtain a sum of an unsteady-state entry pressure value and an unsteady-state exit pressure value of the monitoring substation to obtain a first pressure value, use the first pressure value as the sum of a steady-state exit pressure value and a steady-state entry pressure value of the monitoring substation, and process the first pressure value with the steady-state entry pressure value of the monitoring substation as a reference pressure value to obtain a steady-state exit pressure relative value of the monitoring substation; when the operation type indicated by the process operation information of the monitoring substation is a second type of operation, acquiring the difference between the unsteady outbound pressure value and the unsteady inbound pressure value of the monitoring substation to obtain a third pressure value, taking the third pressure value as the difference between the steady outbound pressure value and the steady inbound pressure value of the monitoring substation, and processing the third pressure value by taking the steady inbound pressure value of the monitoring substation as a reference pressure value to obtain a steady outbound pressure relative value of the monitoring substation;
the monitoring module is used for acquiring a steady-state outbound pressure relative value of a first monitoring substation within a preset time length and a steady-state inbound pressure relative value of a second monitoring substation within the preset time length, wherein the first monitoring substation and the second monitoring substation are two adjacent monitoring substations, and the first monitoring substation is a last monitoring substation of the second monitoring substation; if the descending value of the steady-state outbound pressure relative value of the first monitoring substation in the preset time length exceeds a preset threshold value and the descending value of the steady-state inbound pressure relative value of the second monitoring substation in the preset time length exceeds the preset threshold value, determining that the oil-gas pipeline between the first monitoring substation and the second monitoring substation leaks;
wherein the first type of operation is a regulator valve operation and the second type of operation is a split delivery operation.
4. The apparatus according to claim 3, characterized by said acquisition module for acquiring a first inflection time at which a steady state outbound pressure relative value of said first monitoring substation begins to decline;
the acquisition module is used for acquiring a second inflection point time when the steady-state station entering pressure relative value of the second monitoring substation begins to decline;
the obtaining module is configured to obtain a time difference between the first inflection time and the second inflection time;
and the determining module is used for determining the leakage position of the oil and gas pipeline between the first monitoring substation and the second monitoring substation according to the time difference.
CN201811033843.6A 2018-09-05 2018-09-05 Leakage monitoring method and device for oil and gas pipeline Active CN110878914B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811033843.6A CN110878914B (en) 2018-09-05 2018-09-05 Leakage monitoring method and device for oil and gas pipeline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811033843.6A CN110878914B (en) 2018-09-05 2018-09-05 Leakage monitoring method and device for oil and gas pipeline

Publications (2)

Publication Number Publication Date
CN110878914A CN110878914A (en) 2020-03-13
CN110878914B true CN110878914B (en) 2021-09-28

Family

ID=69727106

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811033843.6A Active CN110878914B (en) 2018-09-05 2018-09-05 Leakage monitoring method and device for oil and gas pipeline

Country Status (1)

Country Link
CN (1) CN110878914B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111649779B (en) * 2020-05-31 2022-04-08 天津大学 Measurement method and application of oil content and total flow rate of oil well based on dense neural network

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5979493A (en) * 1996-08-02 1999-11-09 Gary A. Isaacson, Jr. Flood control device
US7219553B1 (en) * 2003-09-11 2007-05-22 Loren Worthington Dynamic transient pressure detection system
CN203571437U (en) * 2013-11-12 2014-04-30 江苏海创电气科技有限公司 Intelligent pipeline safety monitoring and early warning system
CN104976518A (en) * 2015-06-08 2015-10-14 中国海洋石油总公司 Subsea pipeline leakage monitoring system
CN105114817A (en) * 2015-09-17 2015-12-02 成都千易信息技术有限公司 Oil-gas pipeline monitoring system based on optical fiber
CN108006442A (en) * 2016-11-21 2018-05-08 吉林省百瑞生科技发展有限公司 A kind of fluid line leak position system and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5979493A (en) * 1996-08-02 1999-11-09 Gary A. Isaacson, Jr. Flood control device
US7219553B1 (en) * 2003-09-11 2007-05-22 Loren Worthington Dynamic transient pressure detection system
CN203571437U (en) * 2013-11-12 2014-04-30 江苏海创电气科技有限公司 Intelligent pipeline safety monitoring and early warning system
CN104976518A (en) * 2015-06-08 2015-10-14 中国海洋石油总公司 Subsea pipeline leakage monitoring system
CN105114817A (en) * 2015-09-17 2015-12-02 成都千易信息技术有限公司 Oil-gas pipeline monitoring system based on optical fiber
CN108006442A (en) * 2016-11-21 2018-05-08 吉林省百瑞生科技发展有限公司 A kind of fluid line leak position system and method

Also Published As

Publication number Publication date
CN110878914A (en) 2020-03-13

Similar Documents

Publication Publication Date Title
CN108036201B (en) A kind of Leak Detection in Oil Pipeline Using method based on negative pressure wave method and traffic trends method
CN110208019B (en) Dynamic threshold early warning method for monitoring state of mobile equipment
CN102132138B (en) A method and apparatus for real time enhancing of the operation of a fluid transport pipeline
CN109854953B (en) Crude oil conveying pipeline leakage detection system and method under special working condition
CN109114424B (en) Method and device for determining position of pipeline leakage point
CN110878914B (en) Leakage monitoring method and device for oil and gas pipeline
CN108362966A (en) A kind of oil-immersed type transformer high-precision noise on-line monitoring method and system
CN111720753A (en) Cell DMA (direct memory access) leakage detection control method based on noise monitoring technology
CN114354106A (en) Bridge intelligent monitoring, early warning and analyzing system based on RISC-V
CN109737317B (en) Infrasonic wave positioning system and method for fluid pipeline leakage
CN118088944A (en) Gas pipe network leakage monitoring method and system
CN112413413B (en) Pipeline leakage monitoring and positioning method combining deep learning and multiple measurement technology
CN116972344A (en) Natural gas pipeline leakage detection method, threshold setting method, system and medium
CN108980631B (en) Negative pressure wave method pipeline leakage detection system based on online simulation
CN109323800B (en) Dynamic leakage detection system for railway water supply pipe network
CN115059875B (en) Pipeline leakage monitoring method and system
CN114963013B (en) Management method and system for monitoring urban gas operation state based on Internet of things platform
CN114859020B (en) Method and device for predicting service life of hydraulic oil of shield machine
CN116026534A (en) Filling equipment gas tightness detecting system based on thing networking
CN116045220A (en) Multiphase flow pipeline leakage monitoring method and system
CN114508704B (en) Pipeline leakage detection method and device and storage medium
CN111365138B (en) Rail pressure control method and device
CN109307158A (en) Method and device for determining pipeline leakage
Jin Investigation on Parameters Affecting the Performance of Negative Pressure Wave Leak Detection Systems
Idellette et al. Fault detection using PDE-based observer in transport flow

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant