CN111706786B - Crude oil switching integrated control device and control method - Google Patents
Crude oil switching integrated control device and control method Download PDFInfo
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- CN111706786B CN111706786B CN202010374117.1A CN202010374117A CN111706786B CN 111706786 B CN111706786 B CN 111706786B CN 202010374117 A CN202010374117 A CN 202010374117A CN 111706786 B CN111706786 B CN 111706786B
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- 239000010779 crude oil Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000003921 oil Substances 0.000 claims abstract description 218
- 239000007788 liquid Substances 0.000 claims abstract description 81
- 238000000926 separation method Methods 0.000 claims abstract description 72
- 230000008569 process Effects 0.000 abstract description 23
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 2
- 230000003139 buffering effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- 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
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Health & Medical Sciences (AREA)
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- Water Supply & Treatment (AREA)
- Pipeline Systems (AREA)
Abstract
The invention belongs to the technical field of oil and gas field ground engineering construction, and relates to a crude oil switching integrated control device and a control method. The integrated control device for crude oil transferring is formed by organically combining a three-way valve, an accident oil tank and a main oil conveying pipeline consisting of a separation buffer tank, an electric valve, a main oil conveying pump, a standby oil conveying pump, a liquid level measuring device and a pressure measuring device. When the main oil transportation process of the crude oil switching integrated device is failed and the standby oil transportation process is switched, the logic conflict of interlocking pump stopping caused by the fact that the pressure of the inlet and the outlet of the pump is over-limit due to the fact that the inlet and the outlet of the pump are not completely opened after the pump is started is avoided; meanwhile, the risk of tank overflow due to the fact that the liquid level of the buffer tank exceeds the high limit is avoided in the pump switching process. According to the invention, when the spare oil transportation process has a fault, the switching from the normal production process to the accident process is realized; and after the main or standby oil transfer pump is started, switching from the accident flow to the normal production flow is performed, so that stable and safe operation of production is realized.
Description
Technical Field
The invention belongs to the technical field of oil and gas field ground engineering construction, and particularly relates to a crude oil switching integrated control device and a control method.
Background
The crude oil switching integrated device mainly completes the functions of heating, separating and buffering, pressurizing and outputting crude oil mixtures from an oil field station and the like, as shown in figure 3.
Main oil transportation process: when the device normally operates, the electric three-way valve rotates to the direction B, crude oil enters the separation buffer tank, the liquid level of the buffer tank is interlocked with the oil transfer pump, the pump is started at a high liquid level, the pump is stopped at a low liquid level, and the high liquid level and the low liquid level give an alarm to realize the outward transfer of the crude oil.
A standby oil transportation process: the oil transfer pump is one-use one-standby, when the main oil transfer pump is in failure or the pressure of the inlet and outlet of the pump exceeds the limit, the main oil transfer pump and the inlet and outlet electric valves are closed, the inlet and outlet electric valves of the standby oil transfer pump and the standby oil transfer pump are opened, and if the standby oil transfer pump is in failure or the pressure of the inlet and outlet of the pump exceeds the limit, the standby oil transfer pump and the inlet and outlet electric valves are closed.
When the pressure at the inlet of the device is ultrahigh, the electric three-way valve at the inlet of the interlocking control device is turned to the direction A, and the crude oil enters the accident oil tank.
However, this control method has the following disadvantages: in the switching process of the oil transfer pump, a certain time interval is needed for opening the electric valve at the inlet and the outlet of the pump, crude oil continuously enters the buffer tank in the time interval, and the possibility of overflow of the buffer tank due to the fact that the liquid level of the buffer tank exceeds the high limit exists; in addition, when the oil transfer pump is started and the pump inlet and outlet electric valves are opened at the same time, the pump is stopped in an interlocking manner due to the fact that the pressure of the pump inlet is ultralow or the pressure of the pump outlet is ultrahigh, and therefore the pump cannot be started.
Disclosure of Invention
The invention provides a crude oil switching integrated control device and a control method, and aims to provide a crude oil switching integrated control system and a control method which can realize stable and safe production operation by switching an operation flow and interlocking control in the switching process of a fuel delivery pump.
In order to achieve the purpose, the invention adopts the technical scheme that:
a crude oil switching integrated control device comprises a three-way valve, an accident oil tank and a main oil pipeline; the three-way valve is respectively communicated with a crude oil input pipeline, an input end of an accident oil tank and an input end of a main oil pipeline; the output end of the accident oil tank and the output end of the main oil pipeline are respectively communicated with a crude oil output pipeline; the main oil pipeline comprises a separation buffer tank, an electric valve, a main oil transfer pump, a standby oil transfer pump, a liquid level measuring device and a pressure measuring device; the separation buffer tank is respectively connected with a liquid level measuring device, a main oil transfer pump and a standby oil transfer pump; the input end and the output end of the main oil transfer pump and the standby oil transfer pump are respectively connected with an electric valve and a pressure measuring device; and the input end of the separation buffer tank is connected with a pressure measuring device.
The system also comprises a control system; the control system is respectively in electric signal connection with the electric valve, the main oil transfer pump, the standby oil transfer pump, the liquid level measuring device and the pressure measuring device of the main oil transfer pipeline and used for acquiring data information of the main oil transfer pipeline and sending control signals to the electric valve, the main oil transfer pump and the standby oil transfer pump.
The liquid level measuring device adopts a liquid level transmitter.
The pressure measuring device adopts a pressure transmitter.
The three-way valve adopts an electric three-way valve.
A crude oil switching integrated control method comprises the following steps
The method comprises the following steps: the electric three-way valve is turned to the direction B, crude oil enters the separation buffer tank, and the liquid level transmitter and the pressure transmitter respectively transmit liquid level and pressure signals to the control system;
step two: when the liquid level of the separation buffer tank exceeds a preset high limit, the control system gives an alarm and sends an instruction to open the electric valves of the inlet and the outlet of the main oil transfer pump, and when the electric valves of the inlet and the outlet of the main oil transfer pump are both opened, the step III is carried out; entering a fourth step when an electric valve at the inlet or the outlet of the main oil transfer pump is not opened or the main oil transfer pump is not started; entering a seventh step when the inlet pressure of the separation buffer tank exceeds a preset high limit; when the liquid level of the separation buffer tank exceeds a preset lower limit, the control system gives an alarm and sends an instruction to close the main oil transfer pump, the electric valves at the inlet and the outlet of the main oil transfer pump and the standby oil transfer pump; when the liquid level of the separation buffer tank exceeds a preset high limit, entering the sixth step or the seventh step; when the liquid level of the separation buffer tank is lower than the low-low limit control system, alarming;
step three: the control system sends an instruction to start the main oil transfer pump, and the main oil transfer pump outputs the crude oil entering the separation buffer tank after being normally started; when the main oil transfer pump fails or the pressure of the inlet and the outlet of the main oil transfer pump exceeds the limit, entering the step four;
step four: the control system sends an instruction to close the electric valves at the inlet and the outlet of the main oil transfer pump and start the electric valves at the inlet and the outlet of the standby oil transfer pump; entering a fifth step when the electric valves at the inlet and the outlet of the standby oil transfer pump are both opened, and entering a sixth step when the electric valves at the inlet or the outlet of the standby oil transfer pump are not opened or the standby oil transfer pump is not started;
step five: the control system sends an instruction to start the standby oil transfer pump, the standby oil transfer pump is normally started, and the crude oil entering the separation buffer tank is output; entering a sixth step when the spare oil delivery pump fails or the pressure of the inlet and the outlet of the spare oil delivery pump exceeds the limit;
step six: the control system gives an alarm and sends an instruction to turn the electric three-way valve to the direction A, and closes the standby oil transfer pump and the electric valves at the inlet and the outlet of the standby oil transfer pump, and crude oil enters the accident oil tank;
step seven: the control system gives an alarm and sends an instruction to turn the electric three-way valve to the direction A, and closes the main oil transfer pump and electric valves at the inlet and the outlet of the main oil transfer pump, and crude oil enters the accident oil tank;
step eight: and when the liquid level and the pressure of the separation buffer tank are recovered to be normal, returning to the step one.
The preset height limit of the liquid level of the separation buffer tank in the second step is that the distance between the liquid level and the tank top is 1.4 m; the liquid level preset height limit of the separation buffer tank is that the distance between the liquid level and the tank top is less than 1.3 m; the preset lower limit of the liquid level of the separation buffer tank is that the liquid level is 0.4m away from the tank bottom; the liquid level of the separation buffer tank is preset to be lower than the liquid level which is 0.3m away from the tank bottom.
And in the second step, the preset upper limit of the inlet pressure of the separation buffer tank is 0.6 MPa.
Has the advantages that:
when the main oil transportation process of the crude oil switching integrated device is failed and the standby oil transportation process is switched, the logic conflict of interlocking pump stopping caused by the fact that the pressure of the inlet and the outlet of the pump is over-limit due to the fact that the inlet and the outlet of the pump are not completely opened after the pump is started is avoided; meanwhile, the risk of tank overflow due to the fact that the liquid level of the buffer tank exceeds the high limit is avoided in the pump switching process. According to the invention, when the spare oil transportation process has a fault, the switching from the normal production process to the accident process is realized; and after the standby oil transfer pump is started, switching from the accident flow to the normal production flow is performed, so that stable and safe operation of production is realized.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described 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 without creative efforts.
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic flow chart of the present invention;
fig. 3 is a schematic flow chart of the prior art.
In the figure: 1-a three-way valve; 2-separation buffer tank; 3-an electric valve; 4-a main oil transfer pump; 5-a standby oil transfer pump; 6-accident oil tank; 7-a liquid level transmitter; 8-pressure transmitter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the crude oil switching integrated control device shown in the figure 1 comprises a three-way valve 1, an accident oil tank 6 and a main oil pipeline; the three-way valve 1 is respectively communicated with a crude oil input pipeline, an input end of an accident oil tank 6 and an input end of a main oil pipeline; the output end of the emergency oil tank 6 and the output end of the main oil pipeline are respectively communicated with a crude oil output pipeline; the main oil pipeline comprises a separation buffer tank 2, an electric valve 3, a main oil transfer pump 4, a standby oil transfer pump 5, a liquid level measuring device and a pressure measuring device; the separation buffer tank 2 is respectively connected with a liquid level measuring device, a main oil transfer pump 4 and a standby oil transfer pump 5; the input end and the output end of the main oil transfer pump 4 and the standby oil transfer pump 5 are respectively connected with an electric valve 3 and a pressure measuring device; the input end of the separation buffer tank 2 is connected with a pressure measuring device.
When the device is actually used, the three-way valve is turned to the direction B under the normal working state, and crude oil enters the separation buffer tank 2; when the liquid level of the separation buffer tank 2 exceeds a preset high limit, electric valves 3 at an inlet and an outlet of a main oil transfer pump 4 are opened, when the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4 are both opened, the main oil transfer pump 4 is started, and the crude oil entering the separation buffer tank 2 is output after the main oil transfer pump 4 is normally started; when the main oil transfer pump 4 fails, the pressure of the inlet and the outlet of the main oil transfer pump 4 exceeds the limit, the main oil transfer pump 4 is abnormally started, and the electric valves 3 at the inlet or the outlet of the main oil transfer pump 4 are not opened, the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4 are closed, and the electric valves 3 at the inlet and the outlet of the standby oil transfer pump 5 are started; when the electric valves 3 at the inlet and the outlet of the standby oil transfer pump 5 are both opened, the standby oil transfer pump 5 is started, the standby oil transfer pump 5 is normally started, and the crude oil entering the separation buffer tank 2 is output; when the electric valve 3 at the inlet or the outlet of the spare oil transfer pump 5 is not opened, the spare oil transfer pump 5 fails, the pressure at the inlet and the outlet of the spare oil transfer pump 5 exceeds the limit or the spare oil transfer pump 5 is not successfully started, the three-way valve is turned to the direction A, the electric valves 3 at the inlet and the outlet of the spare oil transfer pump 5 and the spare oil transfer pump 5 are closed, and the crude oil enters the accident oil tank 6.
The failure of the main feed pump 4 and the failure of the backup feed pump 5 in this embodiment both include an excessive rotor or bearing temperature of the main feed pump 4.
The main oil transportation process is adopted when the crude oil is output outwards through the main oil transportation pump 4, and the standby oil transportation process is adopted when the crude oil is output outwards through the standby oil transportation pump 5. By adopting the technical scheme that the standby oil transportation process is switched when the main oil transportation process fails and the standby oil transportation process is switched to the accident oil tank when the main oil transportation process fails, the logic conflict of interlocking and stopping the pump caused by the fact that the pressure of the inlet and the outlet of the pump is over-limit due to the simultaneous opening of the inlet and the outlet valves of the main oil transportation pump 4 and the pump is avoided.
The invention realizes the stable and safe operation of production by switching the operation flow and interlocking control in the switching process of the oil transfer pump.
Example two:
according to the integrated control device for crude oil switching shown in FIG. 1, the difference from the first embodiment is that: the system also comprises a control system; the control system is respectively in electric signal connection with the electric valve 3, the main oil transfer pump 4, the standby oil transfer pump 5, the liquid level measuring device and the pressure measuring device of the main oil transfer pipeline and used for acquiring data information of the main oil transfer pipeline and sending control signals to the electric valve 3, the main oil transfer pump 4 and the standby oil transfer pump 5.
Preferably, the three-way valve is an electric three-way valve 1.
When the device is in actual use, the electric three-way valve 1 is turned to the direction B, crude oil enters the separation buffer tank 2, and the liquid level measuring device and the pressure measuring device respectively transmit liquid level and pressure signals of the separation buffer tank 2 to the control system; when the liquid level of the separation buffer tank 2 exceeds a preset high limit, the control system sends an instruction to open the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4, when the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4 are both opened, the control system sends an instruction to start the main oil transfer pump 4, and the crude oil entering the separation buffer tank 2 is output after the main oil transfer pump 4 is normally started; when the electric valve 3 at the inlet or the outlet of the main oil transfer pump 4 is not opened, the control system sends an instruction to close the electric valve 3 at the inlet and the outlet of the main oil transfer pump 4 and starts the electric valve 3 at the inlet and the outlet of the standby oil transfer pump 5; when the electric valves 3 at the inlet and the outlet of the standby oil transfer pump 5 are both opened, the standby oil transfer pump 5 is started, the standby oil transfer pump 5 is normally started, and the crude oil entering the separation buffer tank 2 is output; when the electric valve 3 at the inlet or the outlet of the main oil transfer pump 4 is not opened, the standby oil transfer pump 5 fails, the pressure at the inlet and the outlet of the standby oil transfer pump 5 exceeds the limit or the standby oil transfer pump 5 is not successfully started, the three-way valve is turned to the direction A, the electric valves 3 at the inlet and the outlet of the standby oil transfer pump 5 and the standby oil transfer pump 5 are closed, and the crude oil enters the accident oil tank 6.
When the control system is used specifically, the control system controls the electric valve 3, the main oil transfer pump 4, the standby oil transfer pump 5, the liquid level measuring device and the pressure measuring device according to the acquired data information, so that the stable and safe operation of production is well realized in the switching process of the oil transfer pumps.
The control system in this embodiment is a PLC control system in the prior art, and any relevant program for acquiring information and transmitting the opening and closing of relevant components in the prior art can be used.
Example three:
according to the crude oil switching integrated control device shown in the figure 1, the difference from the second embodiment is that: the liquid level measuring device adopts a liquid level transmitter 7.
Preferably, the pressure measuring device is a pressure transmitter 8.
When in actual use, the liquid level measuring device and the pressure measuring device adopt the technical scheme, so that the acquired pressure or liquid level information is more accurate, and the automatic control is convenient to realize.
Example four:
according to the integrated control device for crude oil switching shown in FIG. 1, the difference from the first embodiment is that: the three-way valve adopts an electric three-way valve 1.
When in actual use, the technical scheme of the electric three-way valve 1 adopted by the three-way valve is convenient for realizing automatic control.
Example five:
the crude oil switching integrated control method shown in FIG. 2 comprises the following steps
The method comprises the following steps: the electric three-way valve 1 is turned to the direction B, crude oil enters the separation buffer tank 2, and the liquid level transmitter 7 and the pressure transmitter 8 respectively transmit liquid level and pressure signals to the control system;
step two: when the liquid level of the separation buffer tank 2 exceeds a preset high limit, the control system gives an alarm and sends an instruction to open the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4, and when the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4 are both opened, the step III is carried out; entering a step four when the electric valve 3 at the inlet or the outlet of the main oil transfer pump 4 is not opened or the main oil transfer pump 4 is not started; entering a seventh step when the inlet pressure of the separation buffer tank 2 exceeds a preset high limit; when the liquid level of the separation buffer tank 2 exceeds a preset lower limit, the control system gives an alarm and sends an instruction to close the main oil transfer pump 4, the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4 and the standby oil transfer pump 5; when the liquid level of the separation buffer tank 2 exceeds a preset high limit, entering the sixth step or the seventh step; when the liquid level of the separation buffer tank 2 is lower than the low-low limit control system, alarming;
step three: the control system sends an instruction to start the main oil transfer pump 4, and the main oil transfer pump 4 outputs the crude oil entering the separation buffer tank 2 after being normally started; when the main oil transfer pump 4 fails or the pressure of the inlet and the outlet of the main oil transfer pump 4 exceeds the limit, the fourth step is carried out;
step four: the control system sends an instruction to close the electric valves 3 at the inlet and the outlet of the main oil transfer pump 4 and start the electric valves 3 at the inlet and the outlet of the standby oil transfer pump 5; entering a fifth step when the electric valves 3 at the inlet and the outlet of the standby oil transfer pump 5 are both opened, and entering a sixth step when the electric valves 3 at the inlet or the outlet of the standby oil transfer pump 5 are not opened or the standby oil transfer pump 4 is not started;
step five: the control system sends an instruction to start the standby oil transfer pump 5, the standby oil transfer pump 5 is normally started, and the crude oil entering the separation buffer tank 2 is output; entering a sixth step when the spare oil delivery pump 5 fails or the pressure of the inlet and the outlet of the spare oil delivery pump 5 exceeds the limit;
step six: the control system gives an alarm and sends an instruction to turn the electric three-way valve 1 to the direction A, the standby oil transfer pump 5 and the electric valves 3 at the inlet and the outlet of the standby oil transfer pump 5 are closed, and the crude oil enters the accident oil tank 6;
step seven: the control system gives an alarm and sends an instruction to turn the electric three-way valve 1 to the direction A, the main oil transfer pump 5 and the electric valves 3 at the inlet and the outlet of the main oil transfer pump 5 are closed, and the crude oil enters the accident oil tank 6;
step eight: and when the liquid level and the pressure of the separation buffer tank 2 are recovered to be normal, returning to the step one.
According to the control method provided by the invention, in the switching process, the switching operation flow and the interlocking control are realized through the logical operation of the control system, so that the stable and safe operation of the crude oil switching integrated production is realized.
Example six:
according to the crude oil switching integrated control method shown in FIG. 2, the difference from the fifth embodiment is that: the preset liquid level limit of the separation buffer tank 2 in the second step is that the distance between the liquid level and the tank top is 1.4 m; the preset high limit of the liquid level of the separation buffer tank 2 is that the distance between the liquid level and the tank top is less than 1.3 m; the preset lower limit of the liquid level of the separation buffer tank 2 is that the liquid level is 0.4m away from the tank bottom; the preset liquid level low limit of the separation buffer tank 2 is 0.3m from the tank bottom to the liquid level.
In actual use, the crude oil is subjected to buffer separation in the separation buffer tank 2 to separate gas, so that the oil-gas separation and transmission process is realized. The high liquid level is set to be 1.4m away from the tank top, the buffering and separating effect of the separation buffer tank 2 is optimal, and the buffering capacity of the separation buffer tank 2 is maximized. The low liquid level is set to be 0.4m away from the tank bottom, so that certain crude oil is stored in the separation buffer tank 2, and the separation buffer tank 2 is prevented from being damaged due to the air pumping of an external delivery pump. The preset high limit of the liquid level of the separation buffer tank 2 is 1.6m, so that the safety can be ensured, and the stable operation of production can be guaranteed.
Example seven:
according to the crude oil switching integrated control method shown in FIG. 2, the difference from the fifth embodiment is that: and in the second step, the preset high limit of the inlet pressure of the separation buffer tank 2 is 0.5-0.7 MPa.
Preferably, the preset upper limit of the inlet pressure of the separation buffer tank 2 in the second step is 0.6 MPa.
During the in-service use, during liquid level rising and pipe network dug cock in the buffer tank, the crude oil meets changes the pressure that the integrated device defeated oil pipe in net can increase thereupon, and when this pressure value exceeded 0.8MPa, the relief valve can take off the jump. The pressure alarm value is set, so that the pipe network pressure is not out of limit and the production is stably operated.
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.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (3)
1. A crude oil switching integrated control method is characterized in that a device used by the method at least comprises a three-way valve (1), an accident oil tank (6), a main oil pipeline and a control system; the three-way valve (1) is respectively communicated with a crude oil input pipeline, an input end of an accident oil tank (6) and an input end of a main oil pipeline; the output end of the accident oil tank (6) and the output end of the main oil pipeline are respectively communicated with a crude oil external pipeline; the main oil pipeline comprises a separation buffer tank (2), an electric valve (3), a main oil transfer pump (4), a standby oil transfer pump (5), a liquid level measuring device and a pressure measuring device; the separation buffer tank (2) is respectively connected with a liquid level measuring device, a main oil transfer pump (4) and a standby oil transfer pump (5); the input end and the output end of the main oil transfer pump (4) and the standby oil transfer pump (5) are respectively connected with an electric valve (3) and a pressure measuring device; the input end of the separation buffer tank (2) is connected with a pressure measuring device; the control system is respectively in electric signal connection with the electric valve (3), the main oil transfer pump (4), the standby oil transfer pump (5), the liquid level measuring device and the pressure measuring device of the main oil transfer pipeline and is used for acquiring data information of the main oil transfer pipeline and sending control signals to the electric valve (3), the main oil transfer pump (4) and the standby oil transfer pump (5); the liquid level measuring device adopts a liquid level transmitter (7); the pressure measuring device adopts a pressure transmitter (8); the three-way valve adopts an electric three-way valve (1), and the control method comprises the following steps,
the method comprises the following steps: the electric three-way valve (1) is turned to the direction B, crude oil enters the separation buffer tank (2), and the liquid level transmitter (7) and the pressure transmitter (8) respectively transmit liquid level and pressure signals to the control system;
step two: when the liquid level of the separation buffer tank (2) exceeds a preset high limit, the control system gives an alarm and sends an instruction to open the electric valves (3) at the inlet and the outlet of the main oil transfer pump (4), and when the electric valves (3) at the inlet and the outlet of the main oil transfer pump (4) are both opened, the step III is carried out; entering a fourth step when the electric valve (3) at the inlet or the outlet of the main oil transfer pump (4) is not opened or the main oil transfer pump (4) is not started; entering a seventh step when the inlet pressure of the separation buffer tank (2) exceeds a preset high limit; when the liquid level of the separation buffer tank (2) is lower than a preset lower limit, the control system gives an alarm and sends an instruction to close the main oil transfer pump (4), the electric valves (3) at the inlet and the outlet of the main oil transfer pump (4) and the standby oil transfer pump (5); when the liquid level of the separation buffer tank (2) exceeds a preset high limit, entering the sixth step or the seventh step; when the liquid level of the separation buffer tank (2) is lower than the low-low limit control system, alarming is carried out;
step three: the control system sends an instruction to start the main oil transfer pump (4), and the main oil transfer pump (4) outputs crude oil entering the separation buffer tank (2) after being normally started; when the main oil transfer pump (4) is in failure or the pressure of the inlet and the outlet of the main oil transfer pump (4) exceeds the limit, entering the step four;
step four: the control system sends an instruction to close the electric valves (3) at the inlet and the outlet of the main oil transfer pump (4), and starts the electric valves (3) at the inlet and the outlet of the standby oil transfer pump (5); entering a fifth step when the electric valves (3) at the inlet and the outlet of the standby oil transfer pump (5) are both opened, and entering a sixth step when the electric valve (3) at the inlet or the outlet of the standby oil transfer pump (5) is not opened or the standby oil transfer pump (5) is not started;
step five: the control system sends an instruction to start the standby oil transfer pump (5), the standby oil transfer pump (5) is normally started, and the crude oil entering the separation buffer tank (2) is output; entering a sixth step when the spare oil delivery pump (5) fails or the pressure of the inlet and the outlet of the spare oil delivery pump (5) exceeds the limit;
step six: the control system gives an alarm and sends an instruction to turn the electric three-way valve (1) to the direction A, the standby oil transfer pump (5) and the electric valves (3) at the inlet and the outlet of the standby oil transfer pump (5) are closed, and crude oil enters the accident oil tank (6);
step seven: the control system gives an alarm and sends an instruction to turn the electric three-way valve (1) to the direction A, the main oil transfer pump (4) and the electric valves (3) at the inlet and the outlet of the main oil transfer pump (4) are closed, and crude oil enters the accident oil tank (6);
step eight: and when the liquid level and the pressure of the separation buffer tank (2) are recovered to be normal, returning to the step one.
2. The integrated control method for crude oil switching as claimed in claim 1, wherein: the preset high limit of the liquid level of the separation buffer tank (2) in the second step is that the distance between the liquid level and the tank top is 1.4 m; the liquid level of the separation buffer tank (2) is preset with a height limit that the distance between the liquid level and the tank top is less than 1.3 m; the liquid level of the separation buffer tank (2) is preset to be lower than the liquid level which is 0.4m away from the bottom of the tank; the liquid level of the separation buffer tank (2) is preset to be lower than the liquid level which is 0.3m away from the bottom of the tank.
3. The integrated control method for crude oil switching as claimed in claim 1, wherein: and in the second step, the preset upper limit of the inlet pressure of the separation buffer tank (2) is 0.6 MPa.
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| CN112593925B (en) * | 2020-12-29 | 2024-06-21 | 四川速荣科技有限公司 | Oil field multiphase flow online measurement equipment and measurement method |
| CN116688868A (en) * | 2023-08-08 | 2023-09-05 | 新阳科技集团有限公司 | Continuous feeding reaction system with double centrifugal pumps |
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