CN118498962A - Skid-mounted device and method for sand-liquid separate drainage of natural gas station - Google Patents
Skid-mounted device and method for sand-liquid separate drainage of natural gas station Download PDFInfo
- Publication number
- CN118498962A CN118498962A CN202410603378.4A CN202410603378A CN118498962A CN 118498962 A CN118498962 A CN 118498962A CN 202410603378 A CN202410603378 A CN 202410603378A CN 118498962 A CN118498962 A CN 118498962A
- Authority
- CN
- China
- Prior art keywords
- liquid level
- liquid
- sand
- discharge
- fluid
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 255
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000003345 natural gas Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000004576 sand Substances 0.000 claims abstract description 113
- 238000000926 separation method Methods 0.000 claims abstract description 71
- 239000012530 fluid Substances 0.000 claims abstract description 70
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 230000001960 triggered effect Effects 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 239000007789 gas Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 241000883990 Flabellum Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention belongs to the technical field of natural gas production equipment, and particularly relates to a skid-mounted device and method for sand-liquid separate discharge of a natural gas station, wherein the skid-mounted device comprises the following components in parts by weight; a separating container, wherein fluid enters a containing cavity of the separating container to perform mortar and liquid separating operation; a liquid discharge control unit and a sand discharge control unit; the main control unit is used for outputting control information and judging whether the fluid level measured by the liquid level meter is higher than the lower limit of the safety zone; if the liquid level is higher than the preset value, the liquid level is indicated to be in a safe interval; if the fluid level is lower than the lower limit of the limit interval, the sand discharge control unit is indicated to be kept on or off, so that the fluid level is ensured not to be lower than the lower limit of the limit interval; through above-mentioned control unit, carry out real-time supervision to the fluid liquid level in the separation container, realize flowing back and arrange the intelligent cooperative control of sand, can optimize flowing back and arrange sand speed, guarantee that pressure vessel liquid level is reasonable, arrange sand normal.
Description
Technical Field
The invention belongs to the technical field of natural gas production equipment, and particularly relates to a skid-mounted device and method for sand-liquid separate drainage of a natural gas station.
Background
In the natural gas testing and gas production operation process, solid-phase particles are usually accompanied in high-pressure and high-speed fluid produced by a shaft, and the solid-phase particles mainly come from weighting materials, stratum sand production, rock debris, perforation residues, fracturing sand and the like in high-density drilling fluid leaked in drilling, particularly after the large-scale sand-adding fracturing of unconventional gas reservoirs such as shale gas and the like, the pressure of a wellhead is high at the initial stage of liquid discharge, and the stratum sand production is more.
The high velocity fluid carrying out of these solid phase particulate materials from the well bore can cause serious erosion and blockage of surface testing equipment, pipelines, meters, etc. used, which can pose a serious threat to the testing and production safety of natural gas wells. For natural gas, the desanding and gas-liquid separation of produced gas in a station are indispensable links.
In order to solve the problem, the existing separation and sand removal integrated treatment sledge systems generally realize the sand removal and gas-liquid separation functions through a separator, but weaken the sand-liquid separation function and cannot adapt to the situation of large sand output in the early stage of well opening.
Therefore, people also try to adopt to set up manual butterfly valve in bin outlet department to discharge mortar, this method can cause the waste of manpower when the play sand is few, still can lead to out sand unstable, probably lead to sand grain unable in time discharge, consequently in the different period of open well, the different circumstances of play sand volume promptly, guarantee sand-liquid separation, and the stable problem that needs to solve in the field of degritting.
Disclosure of Invention
In order to solve the problems, the invention provides a skid-mounted device for sand-liquid separation of a natural gas station, which comprises;
A separating container, wherein fluid enters a containing cavity of the separating container to perform mortar and liquid separating operation;
The liquid discharge control unit is used for measuring the liquid level of the fluid in the middle of the separation container through the first liquid level meter, and triggering the first regulating valve to regulate the opening degree so as to control the liquid discharge flow of the liquid discharge pipeline;
the sand discharge control unit is used for measuring the fluid level at the bottom of the separation container through a second liquid level meter and triggering a second regulating valve to be kept open or closed so as to control whether mortar in the sand discharge pipeline is discharged or not;
The main control unit is used for outputting control information and judging whether the fluid level measured by the liquid level meter is higher than the lower limit of the safety zone; if the liquid level is higher than the preset value, the liquid level is indicated to be in a safe interval; if the fluid level is lower than the lower limit of the limit interval, the sand discharge control unit is indicated to be kept on or off, and the fluid level is ensured not to be lower than the lower limit of the limit interval.
Preferably, the first liquid level meter comprises at least one double-flange liquid level meter and/or one magnetic flap liquid level meter, the separation container is in a sealed cylinder shape, a liquid draining interface is arranged on the side of the cylinder, the liquid draining interface is connected with a liquid draining pipeline, and a first electric control ball valve, a first electric control valve and a first electric flat gate valve are sequentially arranged on the liquid draining pipeline along the liquid draining direction.
Preferably, the second liquid level meter comprises at least one double-flange liquid level meter, a sand discharge interface is arranged at the bottom of the separating container barrel, the sand discharge interface is connected with a sand discharge pipeline, and a second electric ball valve and two second electric flat gate valves are sequentially arranged on the sand discharge pipeline along the sand discharge direction.
Preferably, a fixed throttle nozzle is arranged between the two second electric flat gate valves, and the size of the fixed throttle nozzle can be changed according to the sand discharge amount.
Preferably, the baffle is horizontally arranged in the accommodating cavity of the separation container, the baffle is positioned above the liquid discharge interface, a plurality of liquid discharge holes are formed in the surface of the baffle along the vertical direction, the bottom end of the accommodating cavity is obliquely provided with the sand setting plate, the sand setting plate is in a fan blade shape, and the fan surface extends downwards to be flush with the sand discharge interface.
The application also claims a method for sand liquid separate discharge of a natural gas field station, which is applied to the skid-mounted device and comprises the following steps of;
presetting a safe interval of the fluid level of the separation vessel;
Inputting control information into the main control unit based on the safety interval;
ensuring that the liquid discharge control unit is in a standby state, and measuring the liquid level in the middle of the separation container by a first liquid level meter, wherein the opening of a first regulating valve can be triggered to control the liquid discharge flow of a liquid discharge pipeline;
Ensuring that the sand discharge control unit is in a standby state, namely, the second liquid level meter measures the liquid level at the bottom of the separation container, and triggering the second regulating valve to be kept on or off so as to control whether mortar in the sand discharge pipeline is discharged or not;
the fluid enters a separation container, mortar and liquid separation operation is carried out, and the fluid level is monitored in real time by a liquid level meter;
based on the control information, the main control unit determines whether the fluid level is above a safe interval lower limit;
If the liquid level is higher than the preset value, the liquid level is indicated to be in a safe interval;
If the fluid level is lower than the lower limit of the limit interval, the sand discharge control unit is indicated to be kept on or off, and the fluid level is ensured not to be lower than the lower limit of the limit interval.
Preferably, the safety interval is [ a, b ], wherein a is the lower limit of the safety interval, 110% of the lowest liquid level height in the cavity, and b is the upper limit of the safety interval, 90% of the highest liquid level height.
Preferably, the liquid discharge control unit is ensured to be in a standby state, and the method specifically comprises the following steps of;
Ensuring that the first electric control ball valve and the first electric flat gate valve are in a normally open position for continuous liquid discharge;
The first liquid level meter is ensured to continuously monitor the liquid level, the first electric control ball valve and the first electric flat gate valve can be triggered to keep open or close, and the first liquid level meter can trigger the first electric regulating valve to make opening action, and the opening is 0% -100%.
Preferably, the sand discharge control unit is ensured to be in a standby state, and the method specifically comprises the following steps of;
according to the size of the sand discharge amount, a fixed throttle nozzle with the corresponding size is selected and is arranged between the two second electric flat gate valves;
ensuring that the second electric ball valve and the two second electric flat gate valves are in a normally open position for continuous sand discharge;
the second liquid level meter is ensured to continuously monitor the liquid level, and the second electric ball valve and the two second electric flat gate valves can be triggered to be kept open or closed.
Preferably, the mortar and liquid separation operation is carried out, comprising the following steps;
The fluid enters the separating container, primary separation is carried out through gravity sedimentation, secondary rotational flow refined separation is carried out through the liquid discharge hole, the mortar-containing fluid sinks to the sand sedimentation plate, gravity third separation is carried out, and after the fluid enters the separating container, the fluid level is measured by the first liquid level meter and the second liquid level meter.
Preferably, the liquid discharge control unit is instructed to iterate, comprising the steps of;
the first liquid level meter monitors the liquid level of the fluid in the middle of the separation container and is divided into three stages of being higher than the upper limit of the safety zone, being positioned in the safety zone and being lower than the lower limit of the safety zone;
When the liquid level is higher than the upper limit of the safety interval and is located in the safety interval, the first liquid level meter continuously monitors the liquid level, the first electric control ball valve and the first electric flat gate valve are triggered to keep open or close, the first liquid level meter can trigger the first electric regulating valve to make opening action, and the opening is 0% -100% in size until the liquid level of the fluid is controlled in the safety interval in real time.
Preferably, the method for indicating the sand discharge control unit to be kept on or off includes the following steps;
The second liquid level meter monitors the liquid level of the fluid at the bottom of the separation container and is divided into two stages higher than the upper limit of the limit interval and the limit interval;
the liquid level is higher than the upper limit of the limit interval, so that the second liquid level meter is ensured to continuously monitor the liquid level, the second electric ball valve and the two second electric flat gate valves are kept open, and the sand discharge pipeline is used for continuously discharging sand;
the liquid level is in a limit interval, so that the second liquid level meter is ensured to continuously monitor the liquid level, the second electric ball valve and the two second electric flat gate valves can be triggered to be closed, the sand discharge pipeline stops sand discharge, and the liquid level of the fluid is ensured not to be lower than the lower limit of the limit interval.
Advantageous effects
The invention provides a skid-mounted device for sand-liquid separate discharge of a natural gas field station, through which sand-liquid separate discharge can be carried out, mortar is singly discharged by a sand discharge pipeline, and liquid is discharged by a liquid discharge pipeline, so that the liquid discharge pipeline does not contain sand, the risk that a valve of a traditional liquid discharge sand remover is eroded by a high-sand-content fluid to fail rapidly is avoided, and the problem of valve puncture failure is avoided.
Based on the skid-mounted device of the device, the method for sand-liquid separation of the natural gas station is also provided, and comprises the following steps of;
a liquid discharge control unit for controlling a liquid discharge flow rate;
a sand discharge control unit for controlling whether the sand discharge slurry is discharged;
A main control unit for judging to be executed by the liquid discharge control unit and/or the sand discharge control unit;
through above-mentioned control unit, carry out real-time supervision to the fluid liquid level in the separation container, realize flowing back and arrange the intelligent cooperative control of sand, can optimize flowing back and arrange sand speed, guarantee that pressure vessel liquid level is reasonable, arrange sand normal.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a skid according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a separation vessel in an embodiment of the invention;
FIG. 3 shows a schematic of liquid and natural gas metering pipelines in an embodiment of the invention;
FIG. 4 shows a schematic diagram of a method for sand-liquid displacement of a natural gas field station in an embodiment of the invention.
In the drawing the view of the figure,
1. A separation vessel; 11. a baffle; 12. a sand depositing plate; 13. a liquid discharge hole;
A. a liquid discharge interface; 2. a liquid discharge control unit; 21. a first level gauge; 22. a drain line; 23. a first regulating valve; 230. a first electrically controlled ball valve; 231. a first electrically operated regulator valve; 232. a first electric flat gate valve;
B. A sand discharge interface; 3. a sand discharge control unit; 31. a second level gauge; 32. a sand discharge pipeline; 33. a second regulating valve; 330. a second electric ball valve; 331. a second electric flat gate valve; 34. fixed throttle nozzle;
C. an exhaust interface; 5. an exhaust unit; 51. an exhaust line; 52. a natural gas metering line; 53. a third pressure monitoring gauge; 54. an orifice plate flowmeter; 55. a third electric flat gate valve;
61. a liquid metering line; 62. a liquid sampling port; 63. a fourth electric flat gate valve; 64. an electromagnetic flowmeter;
71. an inlet line; 72. a natural gas inlet pipeline.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses a skid-mounted device and method for sand-liquid separate discharge of natural gas station, comprises the following steps of;
1. The skid-mounted device for sand-liquid separate arrangement of the natural gas station has the advantages that the existing skid-mounted device is large in size and difficult to install, so that in the embodiment, a skid can be independently formed according to user requirements, or an integrated skid-mounted structure is formed, namely, the separation container 1 and the skid-mounted platform can be formed into the integrated skid-mounted structure according to client requirements, and then the integrated skid-mounted structure is more convenient to assemble to the on-site platform without secondary assembly, so that the skid-mounted device is integrated in function, compact in structure and small in occupied area, and the construction period of the station can be shortened.
Typically, the separation vessel 1 is located in the middle of the skid platform, the upper side of the separation vessel 1 being connected to an inlet line, the inlet line 71 being in communication with a natural gas inlet line 72 for introducing wellhead-derived fluid.
Referring to fig. 1, fig. 1 shows a schematic diagram of a skid-mounted device according to an embodiment of the present invention; the apparatus includes;
The separation container 1, fluid enters the cavity of the separation container 1, carry out gas, mortar, liquid separation operation;
referring to fig. 2, fig. 2 shows a schematic diagram of a separation vessel in an embodiment of the invention; baffle 11 has been arranged to separation container 1 appearance intracavity level, and baffle 11 is located flowing back interface A top, and has arranged a plurality of flowing back holes 13 along plumb direction on the baffle 11 face, holds the chamber bottom slope and has arranged sand setting board 12, and sand setting board 12 is the flabellum, and the fan surface extends downwards to the department parallel and level with the sand discharging interface B.
Referring to fig. 1 again, not described in detail, the liquid discharge control unit 2 measures the liquid level in the middle of the separation vessel 1 through the first liquid level meter 21, and triggers the first adjusting valve 23 to adjust the opening degree so as to control the liquid discharge flow rate of the liquid discharge pipeline 22; wherein,
The first liquid level meter 21 comprises at least one double-flange liquid level meter and/or one magnetic flap liquid level meter, the separation container 1 is in a sealed cylinder shape, a liquid discharge interface A is arranged at the side of the cylinder, the liquid discharge interface A is connected with a liquid discharge pipeline 22, and a first electric control ball valve 230, a first electric control valve 231 and a first electric flat gate valve 232 are sequentially arranged on the liquid discharge pipeline 22 along the liquid discharge direction.
The sand discharge control unit 3 measures the liquid level at the bottom of the separation container 1 through the second liquid level meter 31, and triggers the second regulating valve 33 to be kept open or closed so as to control whether the sand discharge pipeline 32 discharges the mortar; wherein,
The second liquid level meter 31 comprises at least one double-flange liquid level meter, and is beneficial to preventing sand blockage to the liquid level monitoring position when the sand amount is excessive, so that the accuracy of liquid level monitoring is affected; a sand discharge port B is arranged at the bottom of the separating container 1, the sand discharge port B is connected with a sand discharge pipeline 32, and a second electric ball valve 330 and two second electric flat gate valves 331 are sequentially arranged on the sand discharge pipeline 32 along the sand discharge direction;
A fixed throttle 34 is arranged between the two second electric flat gate valves 331, and the size of the fixed throttle 34 can be changed according to the sand discharge amount.
Obviously, in the early gas production stage of the gas well, the production liquid and sand yield are larger, and the large-size oil nozzle is selected for sand discharge; in the middle period of gas production, the liquid production amount and sand production are less, and the small oil nozzle with the size of 2-3 mm is replaced for production; in the later period of gas production, the liquid yield and the sand yield are further reduced; by installing the fixed throttle 34 with different sizes, the flow of the discharged mortar can be regulated and controlled, and sand is continuously discharged through the fixed throttle 34, so that the risk that the sand is directly discharged through a valve and is eroded by a high-speed sand-containing fluid to fail in the prior art is avoided.
It should be noted here that the sand discharge line 32 and the drain line 22 are provided with backup lines, and each valve is provided on the lines for replacement in case of failure of the main line.
The exhaust unit 5 is used for removing gas in the cavity of the separation container 1, and comprises an exhaust interface C arranged at the top of the separation container 1, and the front end of an exhaust pipeline 51 is connected by the top exhaust interface C and is used for exhausting.
As is apparent from fig. 2, the liquid discharge port a, the sand discharge port B and the air discharge port C are arranged in a staggered manner, so as to realize sand, liquid and air separation.
Referring to fig. 3, fig. 3 shows a schematic diagram of a liquid and natural gas metering line in an embodiment of the invention;
The sand discharge line 32 and the drain line 22 are collected and passed through the liquid metering line 61. The liquid metering pipeline 61 is provided with two fourth electric flat gate valves 63 and a liquid sampling port 62, an electromagnetic flowmeter 64 is arranged between the two fourth electric flat gate valves 63 and used for metering the non-gas discharge amount of the cavity of the separation container 1, and the design of the liquid sampling port 62 can randomly sample and discharge mortar and fluid samples.
It is noted here that the sand discharge line 32 merges with the liquid discharge line 22 and the mortar liquid metering line 61, and the entire discharge amount of the skid is metered by the electromagnetic flowmeter 64. When the amount of sand produced is large, sand clogging of the electromagnetic flowmeter 64 may occur. When a fault occurs, the two fourth electric flat gate valves 63 can be turned off to clean the electromagnetic flowmeter.
The rear end of the exhaust line 51 is connected to a natural gas metering line 52, and the natural gas metering line 52 is provided with a third pressure monitoring gauge 53, an orifice plate flowmeter 54 and an electric flat gate valve 55. The gas discharge from the chamber of the separating vessel 1 can be metered in at this time.
The main control unit is used for outputting control information and judging whether the fluid level measured by the corresponding liquid level meter is higher than the lower limit of the safety zone; if the liquid level is higher than the preset value, the liquid level control unit 2 is instructed to iterate until the liquid level of the fluid is in a safe interval; if the liquid level is lower than the lower limit of the limit interval, the sand discharge control unit 3 is indicated to be closed, the mortar is not discharged, and the liquid level of the fluid is ensured not to be lower than the lower limit of the limit interval.
2. A method for sand-liquid separate discharge of a natural gas station, which is applied to a skid-mounted device and comprises the following steps of;
referring to FIG. 4, FIG. 4 shows a schematic diagram of a method for sand-liquid displacement of a natural gas field station in accordance with an embodiment of the present invention;
in S1, a safety interval of the fluid level of the separation vessel 1 is preset, wherein the safety interval is (a, b), a is the lower limit of the safety interval and is 110% of the lowest liquid level height in the vessel, and b is the upper limit of the safety interval and is 90% of the highest liquid level height.
S2, based on the safety interval, inputting control information into the main control unit: the control information is input into a prefabricated PLC control cabinet in the sledge by adopting an RS485 communication protocol, and control parameters are output to the liquid discharge control unit 2 and the sand discharge control unit 3 through PLC operation, so that automatic control of the opening of the regulating valve in the control unit is realized.
In S3, the drain control unit 2 is ensured to be in a standby state,
Ensuring that the first electrically controlled ball valve 230 and the first electrically powered flat gate valve 232 are in a normally open position;
Ensuring that the first liquid level meter 21 continuously monitors the liquid level, the first electric control ball valve 230 and the first electric flat gate valve 232 can be triggered to keep open or close, and the first liquid level meter 21 can trigger the first electric regulating valve 231 to perform opening action, wherein the opening is 0% -100%.
It should be noted that, the first electrically controlled ball valve 230 is in a normally open state and can be remotely turned off by the skid-mounted device, so that the first electrically controlled ball valve 230 rarely suffers from a puncture. The first electric control valve 231 is used for controlling the flow rate of the drain line, and the fluid is inevitably provided with a small amount of sand after the sand removal process, and although the first electric control valve 231 is made of erosion-resistant materials, the valve can still be in a puncture and leakage condition. Therefore, when a fault occurs, the first electrically controlled ball valve 230 and the first electrically controlled flat gate valve 232 may be turned off, and the first electrically controlled regulator valve 231 may be replaced.
In S4, the sand discharge control unit 3 is ensured to be in a standby state,
According to the size of the sand discharge amount, a fixed throttle 34 with the corresponding size is selected and is arranged between the two second electric flat gate valves 331;
Ensuring that the second electrically powered ball valve 330 and the two second electrically powered flat gate valves 331 are in a normally open position;
Ensuring that the second level gauge 31 is continuously monitoring the liquid level, the second electrically powered ball valve 330 and the two second electrically powered flat gate valves 331 may be triggered to remain open or closed.
In S5, the processing unit is configured to,
Fluid enters through an inlet pipeline 71, primary separation is carried out through gravity sedimentation, secondary cyclone separation is carried out through a liquid discharge hole 13, mortar-containing fluid sinks to a sand setting plate 12 for gravity third separation, and after the fluid enters into a separation container 1, the fluid level is measured by a first liquid level meter 21 and a second liquid level meter 31.
In S6, the processing unit is configured to,
Based on the control information, the main control unit determines whether the fluid level is above a safe interval lower limit;
In S7, the processing unit is configured to,
If the temperature is higher than the temperature of the liquid,
The first liquid level meter 21 monitors the liquid level of the fluid in the middle part of the separation vessel 1 and is divided into three stages of being higher than the upper limit of the safety zone, being positioned in the safety zone and being lower than the lower limit of the safety zone;
When the liquid level is higher than the upper limit of the safety interval and is in the safety interval, the first liquid level meter 21 continuously monitors the liquid level, the first electric control ball valve 230 and the first electric flat gate valve 232 are triggered to keep open or close, and the first liquid level meter 21 can trigger the first electric regulating valve 231 to perform opening action, and the opening is 0% -100%, so that the liquid level of the fluid is controlled in the safety interval in real time.
Taking the case that the liquid level is higher than the upper limit of the safety zone as an example, since the fluid in the separation vessel 1 continuously flows, the first liquid level meter 21 monitors the fluid level in real time, and monitors that the liquid level is higher than the upper limit of the safety zone, at this time, the first electric control ball valve 230 and the first electric flat gate valve 232 are in the normally open position, and trigger the first electric control valve 231 to generate the opening, then when the fluid level rapidly rises, the opening of the control valve correspondingly increases, so that the fluid level is ensured to be in the safety zone, and similarly, when the fluid level rapidly drops, the opening of the control valve correspondingly decreases.
In S8 the process proceeds to the step of,
If the ratio is lower than the threshold value,
The second liquid level meter 31 monitors the liquid level of the fluid at the bottom of the separation container 1 and is divided into two stages higher than the upper limit of the limit interval and the limit interval;
The liquid level is higher than the upper limit of the limit interval, so that the second liquid level meter 31 is ensured to continuously monitor the liquid level, the second electric ball valve 330 and the two second electric flat gate valves 331 can be triggered to be opened, and the sand discharge pipeline 32 is ensured to continuously discharge sand;
the liquid level is in a limit interval, so that the second liquid level meter 31 is ensured to continuously monitor the liquid level, the second electric ball valve 330 and the two second electric flat gate valves 331 can be triggered to be closed, the sand discharge pipeline 32 stops sand discharge, and the liquid level is ensured not to be lower than the lower limit of the limit interval.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A skid-mounted device for sand-liquid separate drainage of a natural gas station, which is characterized by comprising the following components;
A separating container (1), wherein fluid enters a containing cavity of the separating container (1) to perform mortar and liquid separating operation;
The liquid discharge control unit (2) is used for measuring the liquid level of the middle part of the separation container (1) through the first liquid level meter (21), and triggering the first regulating valve (23) to regulate the opening degree so as to control the liquid discharge flow of the liquid discharge pipeline (22);
The sand discharge control unit (3) is used for measuring the fluid level at the bottom of the separation container (1) through the second liquid level meter (31), and triggering the second regulating valve (33) to be kept on or off so as to control whether mortar in the sand discharge pipeline (32) is discharged or not;
The main control unit is used for outputting control information and judging whether the fluid level measured by the liquid level meter is higher than the lower limit of the safety zone; if the liquid level is higher than the preset value, the liquid level is indicated to be repeatedly iterated by the liquid discharge control unit (2) until the liquid level of the fluid is positioned in a safe interval; if the liquid level is lower than the lower limit of the limit interval, the sand discharge control unit (3) is indicated to be kept on or off, and the liquid level of the fluid is ensured not to be lower than the lower limit of the limit interval.
2. Skid-mounted device for sand-liquid separation of natural gas field station according to claim 1, characterized in that the first liquid level meter (21) comprises at least one double flange liquid level meter and/or one magnetic flap liquid level meter, the separation container (1) is in a sealed cylinder shape, a liquid discharge interface a is arranged on the cylinder side, the liquid discharge interface a is connected with a liquid discharge pipeline (22), and a first electric control ball valve (230), a first electric control valve (231) and a first electric flat gate valve (232) are sequentially arranged on the liquid discharge pipeline (22) along the liquid discharge direction.
3. Skid-mounted device for sand-liquid separation of natural gas field stations according to claim 2, characterized in that the second liquid level meter (31) comprises at least one double flange liquid level meter, the bottom of the separating container (1) is provided with a sand discharge interface B, the sand discharge interface B is connected with a sand discharge pipeline (32), and a second electric ball valve (330) and two second electric flat gate valves (331) are sequentially arranged on the sand discharge pipeline (32) along the sand discharge direction.
4. A skid-mounted device for sand-liquid separation of a natural gas field station according to claim 3, characterized in that a fixed throttle (34) is arranged between two second electric flat gate valves (331), the size of the fixed throttle (34) being changeable according to the sand discharge amount.
5. The skid-mounted device for sand-liquid separation of a natural gas station according to claim 4, wherein a baffle (11) is horizontally arranged in a cavity of the separation container (1), the baffle (11) is positioned above the liquid discharge interface A, a plurality of liquid discharge holes (13) are vertically arranged on the surface of the baffle (11), a sand setting plate (12) is obliquely arranged at the bottom end of the cavity, and the sand setting plate (12) is in a fan shape, extends downwards in a fan shape and is flush with the sand discharge interface B.
6. A method for sand-liquid separation of a natural gas station, which is applied to the skid-mounted device of any one of claims 1 to 5, and comprises the following steps of;
Presetting a safe interval of the fluid level of the separation container (1);
Inputting control information into the main control unit based on the safety interval;
Ensuring that the liquid discharge control unit (2) is in a standby state, measuring the liquid level in the middle part of the separation container (1) by the first liquid level meter (21), and triggering the opening of the first regulating valve (23) to control the liquid discharge flow of the liquid discharge pipeline (22);
Ensuring that the sand discharge control unit (3) is in a standby state, namely, the second liquid level meter (31) measures the liquid level at the bottom of the separation container (1), and triggering the second regulating valve (33) to be kept on or off so as to control whether mortar in the sand discharge pipeline (32) is discharged or not;
the fluid enters a separation container (1), mortar and liquid separation operation is carried out, and the fluid level is monitored in real time by a liquid level meter;
based on the control information, the main control unit determines whether the fluid level is above a safe interval lower limit;
if the liquid level is higher than the preset value, the liquid level is indicated to be repeatedly iterated by the liquid discharge control unit (2) until the liquid level of the fluid is positioned in a safe interval;
If the liquid level is lower than the lower limit of the limit interval, the sand discharge control unit (3) is indicated to be kept on or off, and the liquid level of the fluid is ensured not to be lower than the lower limit of the limit interval.
7. The method for sand-liquid displacement of a natural gas field station of claim 6, wherein the safety interval is [ a, b ], wherein a is a lower safety interval limit, which is 110% of the lowest liquid level height in the cavity, and b is an upper safety interval limit, which is 90% of the highest liquid level height.
8. A method for sand-liquid displacement of a natural gas field station according to claim 6, characterized by ensuring that the liquid discharge control unit (2) is in a standby state, comprising in particular the following steps;
ensuring that the first electric control ball valve (230) and the first electric flat gate valve (232) are in a normally open position for continuous liquid discharge;
The first liquid level meter (21) is ensured to continuously monitor the liquid level, the first electric control ball valve (230) and the first electric flat gate valve (232) can be triggered to keep open or close, and the first liquid level meter (21) can trigger the first electric regulating valve (231) to perform opening action, and the opening is 0% -100%.
9. A method for sand-liquid displacement of a natural gas field station according to claim 6, characterized by ensuring that the sand-displacement control unit (3) is in a standby state, comprising in particular the following steps;
According to the size of the sand discharge amount, a fixed throttle nozzle (34) with the corresponding size is selected and is arranged between the two second electric flat gate valves (331);
ensuring that the second electric ball valve (330) and the two second electric flat gate valves (331) are in a normally open position for continuous sand discharge;
ensuring that the second liquid level meter (31) continuously monitors the liquid level, the second electric ball valve (330) and the two second electric flat gate valves (331) can be triggered to be kept open or closed.
10. A method for sand-liquid displacement of a natural gas field station as recited in claim 6, wherein a mortar-liquid separation operation is performed, comprising the steps of;
The fluid enters the separation container (1), primary separation is carried out through gravity sedimentation, secondary rotational flow refined separation is carried out through the liquid discharge hole (13), the mortar-containing fluid sinks to the sand setting plate (12), gravity third separation is carried out, and after the fluid enters the separation container (1), the fluid level is measured by the first liquid level meter (21) and the second liquid level meter (31).
11. A method for sand-liquid displacement of a natural gas field station according to claim 6, characterized by instructing the liquid discharge control unit (2) to iterate, comprising the steps of;
The first liquid level meter (21) monitors the liquid level of the middle part of the separation container (1) and is divided into three stages of being higher than the upper limit of a safety zone, being positioned in the safety zone and being lower than the lower limit of the safety zone;
When the liquid level is higher than the upper limit of the safety interval and is located in the safety interval, the first liquid level meter (21) continuously monitors the liquid level, the first electric control ball valve (230) and the first electric flat gate valve (232) are triggered to keep open or close, the first liquid level meter (21) can trigger the first electric regulating valve (231) to perform opening action, and the opening is 0% -100% until the liquid level of the fluid is controlled in the safety interval in real time.
12. A method for sand-liquid displacement of a natural gas field station according to claim 6, characterized by instructing the sand-displacement control unit (3) to remain on or off, comprising the steps of;
the second liquid level meter (31) monitors the liquid level of the fluid at the bottom of the separation container (1) and is divided into two stages higher than the upper limit of the limit interval and the limit interval;
The liquid level is higher than the upper limit of the limit interval, so that the second liquid level meter (31) is ensured to continuously monitor the liquid level, the second electric ball valve (330) and the two second electric flat gate valves (331) are kept open, and the sand discharge pipeline (32) is used for continuously discharging sand;
the liquid level is in a limit interval, so that the second liquid level meter (31) is ensured to continuously monitor the liquid level, the second electric ball valve (330) and the two second electric flat gate valves (331) can be triggered to be closed, the sand discharge pipeline (32) stops sand discharge, and the liquid level of the fluid is ensured not to be lower than the lower limit of the limit interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410603378.4A CN118498962A (en) | 2024-05-15 | 2024-05-15 | Skid-mounted device and method for sand-liquid separate drainage of natural gas station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410603378.4A CN118498962A (en) | 2024-05-15 | 2024-05-15 | Skid-mounted device and method for sand-liquid separate drainage of natural gas station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118498962A true CN118498962A (en) | 2024-08-16 |
Family
ID=92237756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410603378.4A Pending CN118498962A (en) | 2024-05-15 | 2024-05-15 | Skid-mounted device and method for sand-liquid separate drainage of natural gas station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118498962A (en) |
-
2024
- 2024-05-15 CN CN202410603378.4A patent/CN118498962A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101694152B (en) | Multi-level fine choke manifold and automatic control system | |
| CA2396682C (en) | Method and apparatus for separating and measuring solids from multi-phase well fluids | |
| US4989671A (en) | Gas and oil well controller | |
| US20210252431A1 (en) | Automated sand detection and handling system for oil and gas well operations | |
| US11938422B2 (en) | Differential pressure based automated sand detection and handling system for oil and gas well operations | |
| CN111271045B (en) | A gas-liquid-solid three-phase cyclone sand removal device | |
| CN105507886A (en) | Overflow and well leakage monitoring system and monitoring method thereof | |
| CN111980745A (en) | Broken soft low-permeability coal bed gas treatment equipment and method in drilling oriented cave-making permeability-increasing area | |
| CN114737945B (en) | High-efficient degritting separation measurement integration sledge of adaptation variable operating mode | |
| CN107780888A (en) | Gas hydrates pilot production analogue means and method | |
| CN104524817B (en) | Control system of gas-liquid separation device | |
| US20240125969A1 (en) | Method for Experimentally Determining Critical Sand-Carrying Gas Velocity of Shale Gas Wells | |
| CN207623167U (en) | Analogue system is evaluated in hydrate recovery well machinery screen cutting | |
| CN109555511A (en) | A kind of oil well desanding device based under pulsing jet technology and cyclonic separation mechanism | |
| CN118498962A (en) | Skid-mounted device and method for sand-liquid separate drainage of natural gas station | |
| CN105385432B (en) | A kind of fracturing fluid recovery fluid erosion prevention desanding system and method | |
| CN201730605U (en) | Throttle manifold | |
| CN103114838B (en) | High-pressure automatic sand discharge device | |
| CN208294499U (en) | A kind of normal pressure shale gas water drainage gas production device | |
| CN212079284U (en) | Novel gas-liquid-solid three-phase cyclone desanding device | |
| CN212158737U (en) | Drainage metering device for dewatering | |
| CN216950339U (en) | Automatic continuous desanding system | |
| CN210543797U (en) | Gas-liquid separator for well head | |
| CN211737116U (en) | Natural gas well mouth cyclone sand remover | |
| CN115685910A (en) | Intelligent production control device for natural gas well |
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 |