CN111088964A - Cluster well gas collection system and control method - Google Patents
Cluster well gas collection system and control method Download PDFInfo
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- CN111088964A CN111088964A CN201911314866.9A CN201911314866A CN111088964A CN 111088964 A CN111088964 A CN 111088964A CN 201911314866 A CN201911314866 A CN 201911314866A CN 111088964 A CN111088964 A CN 111088964A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003245 coal Substances 0.000 claims abstract description 45
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 230000002000 scavenging effect Effects 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000010408 sweeping Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002516 radical scavenger Substances 0.000 description 4
- 238000010926 purge Methods 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- 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
- E21B43/006—Production of coal-bed methane
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- 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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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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
- F17D1/02—Pipe-line systems for gases or vapours
-
- 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
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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
- F17D3/14—Arrangements for supervising or controlling working operations for eliminating water
- F17D3/145—Arrangements for supervising or controlling working operations for eliminating water in gas pipelines
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- 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
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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Abstract
The disclosure relates to a cluster well gas collection system and a control method, and belongs to the field of coal bed gas transportation. The cluster well gas collection system comprises a plurality of gas inlet pipelines, a gas regulating valve, a gas inlet valve, a gas collection manifold, an external transmission pipeline and a check valve. Each air inlet pipeline is communicated with at least one production well of the cluster well, an air regulating valve and an air inlet valve are uniformly arranged on each air inlet pipeline, the air inlet pipelines are communicated with the external transmission pipeline through the same air collecting manifold, and the air collecting manifold is communicated with the external transmission pipeline through a check valve. The gas inlet pipeline is communicated with the production well, the coal bed gas in the production well enters the gas inlet pipeline, and the gas inlet pipelines are connected with an external conveying pipeline through a gas collecting manifold. The check valve is arranged between the gas collection manifold and the external transmission pipeline, the check valve is not required to be uniformly arranged on each gas inlet pipeline, the total number of valves on each gas inlet pipeline is reduced, and the structure is simple. Meanwhile, the total length of the pipeline is reduced, and the cost is reduced.
Description
Technical Field
The disclosure relates to the field of coal bed gas transportation, in particular to a cluster well gas collection system and a control method.
Background
The coal bed gas belongs to the national important clean energy. The coal bed gas is usually mined by a cluster well, the cluster well comprises a plurality of mining wells, and the coal bed gas in each mining well is collected to an external conveying pipeline for transportation through a respective gas collecting pipeline.
And an independent valve is arranged on the pipeline in each mining well and used for independently controlling the transportation of the coal bed gas in each mining well.
However, the cluster well has a large number of producing wells, the pipeline of each producing well needs to be provided with a separate valve, and the number of valves on the pipeline of each producing well is large, so that the gas pipeline structure of the cluster well is complex. And the pipeline of each production well is independently connected with an external conveying pipeline, so that the total length of the pipeline of the cluster well is longer, and the cost is higher.
Disclosure of Invention
The embodiment of the disclosure provides a cluster well gas collection system and a control method, which can reduce the total length of a pipeline, reduce the number of valves and reduce the cost. The technical scheme is as follows:
in one aspect, the present disclosure provides a cluster well gas collection system, which includes a plurality of gas inlet pipes, a gas regulating valve, a gas inlet valve, a gas collection manifold, an external transmission pipe and a check valve;
each air inlet pipeline is communicated with at least one production well of the cluster well, the air regulating valve and the air inlet valve are uniformly arranged on each air inlet pipeline, the air inlet pipelines are communicated with the external transmission pipeline through the same air collecting manifold, and the air collecting manifold is communicated with the external transmission pipeline through the check valve.
In an implementation manner of the embodiment of the present disclosure, the cluster well gas collection system further includes a scavenging line pipeline and a first control valve, the scavenging line pipeline is connected to one end of the export pipeline close to the check valve, and the scavenging line pipeline is communicated with the export pipeline;
the first control valve is arranged on the scavenging line pipeline.
In one implementation of the disclosed embodiment, a first pipe plug is detachably mounted on an end of the scavenge line pipe, and the first control valve is located between the first pipe plug and the check valve.
In one implementation manner of the embodiment of the present disclosure, a second control valve is disposed on the gas collection manifold;
the second control valve and the check valve are respectively arranged at two ends of the gas collection header.
In one implementation manner of the embodiment of the present disclosure, a second pipe plug is detachably installed at an end of the gas collection header, which is far away from one end of the outgoing pipeline, and the second control valve is located between the second pipe plug and the check valve.
In one implementation of the embodiment of the present disclosure, each of the air inlet pipes is provided with a flow meter.
In one implementation of the disclosed embodiment, the flow meter is a precession vortex flow meter.
In one implementation of the disclosed embodiment, the air regulating valve is a V-shaped ball valve.
In another aspect, the present disclosure provides a method for controlling a cluster well gas collection system, where the method is used to control the cluster well gas collection system, and the method includes:
opening the gas regulating valve and the gas inlet valve, and enabling the coal bed gas of the gas inlet pipeline to flow to the gas collection manifold and the external transmission pipeline;
opening a first control valve to enable the outward conveying pipeline to be communicated with a scavenging pipeline, wherein the scavenging pipeline is connected with one end, close to the check valve, of the outward conveying pipeline and communicated with the outward conveying pipeline, and the first control valve is arranged on the scavenging pipeline;
removing a first plug removably mounted at an end of the scavenge line conduit, the first control valve being located between the first plug and the check valve;
and blowing gas into the line sweeping pipeline, wherein the gas flows to the outward conveying pipeline and cleans the outward conveying pipeline.
In an implementation manner of the embodiment of the present disclosure, the control method further includes:
opening a second control valve, wherein the second control valve is arranged on the gas collection header, and the second control valve and the check valve are respectively arranged at two ends of the gas collection header;
and removing the second pipe plug to discharge the coal bed gas flow in the plurality of gas inlet pipelines and the gas collection header, wherein the second pipe plug is detachably arranged at the end part of one end of the gas collection header, which is far away from the external transmission pipeline, and the second control valve is positioned between the second pipe plug and the check valve.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
in the embodiment of the disclosure, the gas inlet pipeline is communicated with the production well, the gas regulating valve and the gas inlet valve are arranged on the gas inlet pipeline, the gas regulating valve and the gas inlet valve are opened, the coal bed gas in the production well enters the gas inlet pipeline, the gas inlet pipelines are connected with the external transmission pipeline through the gas collecting manifold, and the coal bed gas in the gas inlet pipelines flows to the external transmission pipeline through the gas collecting manifold to be transported. The check valve is arranged between the gas collection manifold and the external transmission pipeline, the check valve is not required to be uniformly arranged on each gas inlet pipeline, the total number of valves on each gas inlet pipeline is reduced, and the structure is simple. And meanwhile, only one gas collection header is used, so that the total length of the pipeline is reduced, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cluster well gas collection system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for controlling a cluster well gas collection system according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a cluster well gas collection system according to an embodiment of the present disclosure. Referring to fig. 1, the cluster well gas collection system comprises a plurality of gas inlet pipelines 1, a gas regulating valve 2, a gas inlet valve 3, a gas collection manifold 4, an external transmission pipeline 5 and a check valve 6. Each air inlet pipeline 1 is communicated with at least one production well of the cluster well, an air regulating valve 2 and an air inlet valve 3 are uniformly arranged on each air inlet pipeline 1, a plurality of air inlet pipelines 1 are communicated with an external transmission pipeline 5 through the same air collecting manifold 4, and the air collecting manifold 4 is communicated with the external transmission pipeline 5 through a check valve 6.
Wherein, the air inlet pipeline 1 is connected with the production well and used for conveying the coal bed gas in the production well outwards. The gas regulating valve 2 can regulate the flow speed of the coal bed gas in the gas inlet pipeline 1. The intake valve 3 can control communication and blocking of the intake pipe 1. The gas collection header 4 is used for conveying the coal bed gas in the gas inlet pipeline 1 to the external conveying pipeline 5. The outward conveying pipeline 5 is connected with external equipment and used for conveying the coal bed gas of the air inlet pipeline 1 to the external equipment. The check valve 6 can ensure that the coal bed gas in the gas collection header 4 only flows into the external transmission pipeline 5 and does not flow back into the gas collection header 4 from the external transmission pipeline 5.
In this embodiment, admission line 1 and exploitation well intercommunication, and admission line 1 has arranged gas 2 valves and admission valve 3 of transferring, opens gas regulating valve 2 and admission valve 3, and in the coal bed gas in the exploitation well got into admission line 1, many admission lines 1 were connected with an defeated pipeline 5 through a gas collection manifold 4, and the coal bed gas in many admission lines 1 flows to defeated pipeline 5 outward through gas collection manifold 4, transports. The check valve 6 is arranged between the gas collection header 4 and the external transmission pipeline 5, the check valve 6 is not required to be uniformly arranged on each gas inlet pipeline 1, the total number of valves on each gas inlet pipeline 1 is reduced, and the structure is simple. And meanwhile, only one gas collection header is used, so that the total length of the pipeline is reduced, and the cost is reduced.
Illustratively, the cluster well gas collection system provided by the present disclosure may include a plurality of gas inlet pipes 1, and the number of the gas inlet pipes 1 may be between 1 and 100. For example, the number of intake ducts 1 may be 2, 5, 12, etc., which the present disclosure does not limit.
In one implementation of the embodiment of the present disclosure, the air inlet duct 1 may be a metal air inlet duct, which ensures the strength of the air inlet duct 1. For example, the inlet pipe 1 may be a steel inlet pipe.
In an alternative embodiment, the cross-section of the air inlet duct 1 may be circular, the diameter of the air inlet duct 1 may be between 55 millimeters (mm) and 65 mm, and the thickness of the wall of the air inlet duct 1 may be between 3 mm and 8 mm. By the design, the size of the inner cavity of the air inlet pipeline 1 can be ensured to be large, and the conveying capacity of coal bed gas can be ensured.
Illustratively, the diameter of the air intake duct 1 may be 60 mm, and the thickness of the wall of the air intake duct 1 may be 5 mm.
In an implementation manner of the embodiment of the present disclosure, the gas regulating valve 2 may be a V-shaped ball valve, the regulating performance of the V-shaped ball valve is better, compared with an angle valve adopted in the related art, the regulating precision is higher, and the precise regulation of the single-well gas production rate can be realized. For example, the damper valve 2 may be a TVQ47F 3V ball valve.
Illustratively, the Nominal Diameter (DN) of the air regulating valve 2 may be 50 mm, and since the thickness of the pipe wall of the air inlet pipe 1 is 5 mm and the inner Diameter of the air inlet pipe 1 is 50 mm, the fitting degree of the air regulating valve 2 with the air inlet pipe 1 is ensured.
In one implementation of the disclosed embodiment, the air intake valve 3 may be a metal air intake valve, ensuring the strength of the air intake valve 3. For example, the inlet valve 3 may be a steel inlet valve.
In an alternative embodiment, the air inlet valve 3 may be a fixed ball valve, and the front valve, the rear valve and the valve seat of the fixed ball valve can be sealed, so as to control the communication and the blocking of the air inlet pipeline 1. For example, the intake valve 3 may be a Q47F fixed ball valve.
Illustratively, the nominal diameter of the intake valve 3 may be 50 mm, and the inner diameter of the intake pipe 1 may be 50 mm, so as to ensure the matching degree of the intake valve 3 and the intake pipe 1.
In an implementation manner of the embodiment of the present disclosure, the gas collection manifold 4 may be a metal gas collection manifold, so as to ensure the strength of the gas collection manifold 4. For example, the gas collection header 4 may be a steel gas collection header.
In an alternative embodiment, the diameter of the gas collection header 4 may be between 110 mm and 120 mm, and the thickness of the wall of the gas collection header 4 may be between 3 mm and 8 mm. The coal bed gas in each air inlet pipeline 1 flows into the gas collection manifold 4, so that the volume of the inner cavity of the gas collection manifold 4 is large, and the conveying capacity of the coal bed gas can be guaranteed.
Alternatively, the diameter of the gas header 4 may be 114 mm and the wall of the gas header 4 may have a thickness of 5 mm. A plurality of air inlet pipes 1 can be connected with the gas collection manifold 4 through the drift diameter valve, and each air inlet pipe 1 can be communicated with the gas collection manifold 4.
In one implementation of the disclosed embodiment, the outgoing pipe 5 may be a metal outgoing pipe, which ensures the strength of the outgoing pipe 5. For example, the outgoing pipe 5 may be a steel outgoing pipe.
In an alternative embodiment, the diameter of the outgoing line 5 may be 114 mm, and the thickness of the wall of the outgoing line 5 may be 5 mm, so as to ensure that the outgoing line 5 and the gas collection header 4 have the same size, thereby facilitating the connection between the outgoing line 5 and the gas collection header 4.
In one implementation of the disclosed embodiment, the check valve 6 may be a fixed ball valve, for example, the check valve 6 may be an H41H fixed ball valve. Illustratively, the nominal diameter of the check valve 6 may be 100 millimeters.
Referring again to fig. 1, the cluster well gas collection system may further include a scavenging line pipe 7 and a first control valve 8, the scavenging line pipe 7 is connected to one end of the external transport pipe 5 near the check valve 6, the scavenging line pipe 7 is communicated with the external transport pipe 5, and the first control valve 8 is disposed on the scavenging line pipe 7.
In this embodiment, a gas may be blown into the sweep line duct 7, and the gas may flow through the sweep line duct 7 to the outgoing duct 5 to clean the outgoing duct 5. The first control valve 8 can control the communication and the blockage of the scavenging line pipeline 7.
In an alternative embodiment, the sweep-line duct 7 may be a metal sweep-line duct, ensuring the strength of the sweep-line duct 7. For example, the scavenge line pipe 7 may be a steel scavenge line pipe.
In an alternative embodiment, the diameter of the sweep-line duct 7 may be 60 mm, and the thickness of the duct wall of the sweep-line duct 7 may be 5 mm.
In the embodiment of the present disclosure, during the process of conveying the coal bed gas, the coal bed gas may contain water vapor, and the water vapor condenses into water on the pipe wall of the outer conveying pipe 5, occupies a part of the space of the outer conveying pipe 5, reduces the space for conveying the coal bed gas, and increases the pressure in the outer conveying pipe 5. The gas is blown into the outward conveying pipeline 5 through the line sweeping pipeline 7, condensed water accumulated in the outward conveying pipeline 5 is swept, the condensed water is prevented from occupying the volume of the outward conveying pipeline 5, and the pressure in the outward conveying pipeline 5 is reduced.
For example, a gas field collection system may be used in communication with the scavenger line conduit 7 to purge gas into the scavenger line conduit 7.
In an alternative embodiment, the first control valve 8 may be a fixed ball valve, for example the first control valve 8 may be a Q47F fixed ball valve.
Illustratively, the nominal diameter of the first control valve 8 may be 50 mm, since the thickness of the pipe wall of the scavenge line pipe 7 is 5 mm and the inner diameter of the scavenge line pipe 7 is 50 mm, which ensures that the first control valve 8 can be connected with the scavenge line pipe 7.
Referring again to fig. 1, the end of the scavenge line conduit 7 is removably mounted with a first plug 9, and a first control valve 8 is located between the first plug 9 and the check valve 6.
In this implementation, the first pipe plug 9 may be used to block the pipeline 7 when purging is not performed, so as to avoid coal bed methane leakage. Illustratively, the nominal diameter of the first pipe plug 9 may be 50 mm, and since the pipe wall of the sweep pipe 7 has a thickness of 5 mm and the inner diameter of the sweep pipe 7 is 50 mm, it is ensured that the first pipe plug 9 can be mounted on the sweep pipe 7.
In an implementation manner of the embodiment of the present disclosure, the first pipe plug 9 and the scavenging line pipe 7 may be connected by a thread, so as to be conveniently detached. For example, the first plug 9 has an external thread and the scavenge line pipe 7 has an internal thread, which are screwed together.
Referring again to fig. 1, a second control valve 10 is disposed on the gas collection header 4, and the second control valve 10 and the check valve 6 are disposed at two ends of the gas collection header 4, respectively.
In this implementation, the second control valve 10 is connected with the gas collection header 4, and the second control valve 10 can control the connection and the disconnection of the gas collection header 4, so as to avoid coal bed methane from leaking from the gas collection header 4 during transportation. Meanwhile, when the gas in the pipeline needs to be exhausted, the second control valve 10 can be opened to exhaust the gas in the pipeline.
In an implementation manner of the embodiment of the present disclosure, the system may further include an emptying pipe, the emptying pipe is connected to the gas collection header 4, at this time, the second control valve 10 may be disposed on the emptying pipe, and the second control valve 10 is communicated with the gas collection header 4 through the emptying pipe.
Illustratively, the vent may be a vent having a diameter of 60 mm and a wall of 5 mm.
In one implementation of the disclosed embodiment, a second plug 11 is detachably mounted on the end of the gas collection header 4 away from the end of the outgoing line 5, and a second control valve 10 is located between the second plug 11 and the check valve 6.
In this implementation, the second plug 11 is used to plug the end of the gas collection header 4 to prevent coal bed gas in the gas collection header 4 from leaking out. The sealing action of the second control valve 10 is enhanced.
In an implementation manner of the embodiment of the present disclosure, the second pipe plug 11 and the gas collection header 4 may be connected by a screw thread, so that the disassembly is convenient.
Further, when gas collection header 4 and blow-down pipe intercommunication, second stopcock 11 can arrange on the blow-down pipe, and second stopcock 11 blocks up gas collection header 4's tip through blockking up the blow-down pipe, avoids the coal bed gas in the gas collection header 4 to spill.
Illustratively, the nominal diameter of the second plug 11 may be 50 mm, and since the thickness of the wall of the vent is 5 mm and the internal diameter of the vent is 50 mm, it is ensured that the second plug 11 can be connected to the vent.
Referring again to fig. 1, a flow meter 12 is disposed on each intake conduit 1.
In this implementation, the flow meter 12 is used to measure the flow rate of coal bed gas in the inlet conduit 1.
Illustratively, flow meter 12 may be a precession vortex flow meter, for example, flow meter 12 may be a LUX-50ST-II precession vortex flow meter, improving measurement accuracy.
The disclosure also provides a control method of the cluster well gas collection system, and the control method is used for controlling the cluster well gas collection system. Fig. 2 is a flowchart of a method for controlling a cluster well gas collection system according to an embodiment of the disclosure. Referring to fig. 2, the control method includes:
step S1: and opening the gas regulating valve and the gas inlet valve, and enabling the coal bed gas of the gas inlet pipeline to flow to the gas collection manifold and the external conveying pipeline.
The gas regulating valve 2 and the gas inlet valve 3 are opened, the gas inlet pipeline 1 is communicated with a working well, the coal bed gas in the working well flows to the gas inlet pipeline 1, the coal bed gas flows to the gas collection manifold 4 and the external conveying pipeline 5 through the gas inlet pipeline 1, and normal production of the coal bed gas is realized.
The gas regulating valve 2 can regulate the flow speed of the coal bed gas in the gas inlet pipeline 1, and the gas inlet valve 3 can control the communication and the blockage of the gas inlet pipeline 1.
This step may also include, for example, closing the second control valve 10 and installing a second plug 11 at the end of the gas collection header 4. The second control valve 10 is connected with the gas collection header 4, and the end part of the gas collection header 4 is closed through the second control valve 10, so that the coal bed gas is prevented from leaking out of the gas collection header 4 in the transportation process. The second pipe plug 11 strengthens the sealing effect of the second control valve 10 on the gas collecting header 4.
Step S2: and opening the first control valve to communicate the external conveying pipeline with the scavenging pipeline, connecting the scavenging pipeline with one end of the external conveying pipeline close to the check valve, communicating the scavenging pipeline with the external conveying pipeline, and arranging the first control valve on the scavenging pipeline.
And opening the first control valve 8 to communicate the external conveying pipeline 5 with the scavenging line pipeline 7, connecting the scavenging line pipeline 7 with one end of the external conveying pipeline 5 close to the check valve 6, communicating the scavenging line pipeline 7 with the external conveying pipeline 5, and arranging the first control valve 8 on the scavenging line pipeline 7.
Step S3: the first pipe plug is removed and is detachably mounted at the end of the scavenge line conduit, and the first control valve is located between the first pipe plug and the check valve.
The first pipe plug 9 is removed and the first pipe plug 9 is detachably mounted on the end of the scavenge line conduit 7 with the first control valve 8 located between the first pipe plug 9 and the check valve 6.
Step S4: and blowing gas into the line sweeping pipeline, wherein the gas flows to the outward conveying pipeline and is swept.
And blowing gas into the sweeping pipeline 7, wherein the gas flows to the outward conveying pipeline 5, and the gas sweeps the outward conveying pipeline 5.
In the embodiment of the present disclosure, during the process of conveying the coal bed gas, the coal bed gas may contain water vapor, and the water vapor condenses into water on the pipe wall of the outer conveying pipe 5, occupies a part of the space of the outer conveying pipe 5, reduces the space for conveying the coal bed gas, and increases the pressure in the outer conveying pipe 5. The gas is blown into the outward conveying pipeline 5 through the line sweeping pipeline 7, condensed water accumulated in the outward conveying pipeline 5 is swept, the condensed water is prevented from occupying the volume of the outward conveying pipeline 5, and the pressure in the outward conveying pipeline 5 is reduced.
For example, a gas field collection system may be used in communication with the scavenger line conduit 7 to purge gas into the scavenger line conduit 7.
Optionally, the control method further includes:
and opening a second control valve, wherein the second control valve is arranged on the gas collection header, and the second control valve and the check valve are respectively arranged at two ends of the gas collection header.
And opening a second control valve 10, wherein the second control valve 10 is arranged on the gas collection header 1, and the second control valve 10 and the check valve 6 are respectively arranged at two ends of the gas collection header 4.
And removing the second pipe plug to discharge the coal bed gas flow in the plurality of gas inlet pipelines and the gas collection header, wherein the second pipe plug is detachably arranged at the end part of one end of the gas collection header, which is far away from the external transmission pipeline, and the second control valve is positioned between the second pipe plug and the check valve.
And removing the second pipe plug 11 to discharge the coal bed gas flow in the plurality of gas inlet pipelines 1 and the gas collecting header 4, wherein the second pipe plug 11 is detachably arranged at the end part of one end of the gas collecting header 4 far away from the external conveying pipeline 5, and the second control valve 10 is positioned between the second pipe plug 11 and the check valve 6.
In this implementation, the second stopcock 11 opens the second control valve 10, makes admission line 1 and gas collection header 4 communicate, and in the in-process that the pipeline damaged needs to be maintained, can be through gas collection header 4 to the coal bed gas in the pipeline empty, is convenient for follow-up to the pipeline maintain.
Optionally, the control method further includes:
and closing the gas regulating valve 2 and the gas inlet valve 3 to prevent the coal bed gas from flowing into the gas inlet pipeline 1, then taking the flowmeter 12 down, checking the flowmeter 12 and judging whether the flowmeter 12 is damaged or not. After the flowmeter 12 is checked, the flowmeter 12 is installed on the air inlet pipeline 1, and then the air regulating valve 2 and the air inlet valve 3 are opened, so that normal transportation of the coal bed gas is realized.
The cluster well gas collection system control method provided by the disclosure can realize switching of four process flows of normal production, metrological verification and maintenance, accident emptying, reverse scavenging line removal of condensed water in an external pipeline and the like according to requirements, and is convenient to produce and operate and simple to maintain.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A cluster well gas collection system is characterized by comprising a plurality of gas inlet pipelines (1), a gas regulating valve (2), a gas inlet valve (3), a gas collection manifold (4), an external transmission pipeline (5) and a check valve (6);
each air inlet pipeline (1) is communicated with at least one production well of the cluster well, the air regulating valve (2) and the air inlet valve (3) are uniformly arranged on each air inlet pipeline (1), the air inlet pipelines (1) are communicated with the external conveying pipeline (5) through the same air collecting manifold (4), and the air collecting manifold (4) is communicated with the external conveying pipeline (5) through the check valve (6).
2. The cluster well gas collection system according to claim 1, further comprising a sweep line conduit (7) and a first control valve (8), wherein the sweep line conduit (7) is connected to the end of the export conduit (5) near the check valve (6), and the sweep line conduit (7) is in communication with the export conduit (5);
the first control valve (8) is arranged on the scavenging line pipeline (7).
3. Cluster well gas collection system according to claim 2, characterized in that the end of the scavenge line conduit (7) is removably fitted with a first plug (9), the first control valve (8) being located between the first plug (9) and the check valve (6).
4. The cluster well gas collection system according to any one of claims 1 to 3, wherein a second control valve (10) is provided on the gas collection header (4);
the second control valve (10) and the check valve (6) are respectively arranged at two ends of the gas collection header (4).
5. Cluster well gas collection system according to claim 4, characterized in that the end of the gas collection header (4) remote from the end of the outgoing conduit (5) is detachably fitted with a second plug (11), the second control valve (10) being located between the second plug (11) and the non-return valve (6).
6. The cluster well gas collection system according to any one of claims 1 to 3, characterized in that a flow meter (12) is provided on each gas inlet pipe (1).
7. The cluster well gas collection system of claim 6, wherein the flow meter (12) is a precession vortex flow meter.
8. The cluster well gas collection system according to any one of claims 1 to 3, wherein the gas regulating valve (2) is a V-ball valve.
9. A method for controlling the cluster well gas collection system of claim 1, wherein the method comprises:
opening the gas regulating valve and the gas inlet valve, and enabling the coal bed gas of the gas inlet pipeline to flow to the gas collection manifold and the external transmission pipeline;
opening a first control valve to enable the outward conveying pipeline to be communicated with a scavenging pipeline, wherein the scavenging pipeline is connected with one end, close to the check valve, of the outward conveying pipeline and communicated with the outward conveying pipeline, and the first control valve is arranged on the scavenging pipeline;
removing a first plug removably mounted at an end of the scavenge line conduit, the first control valve being located between the first plug and the check valve;
and blowing gas into the line sweeping pipeline, wherein the gas flows to the outward conveying pipeline and cleans the outward conveying pipeline.
10. The cluster well gas collection system control method of claim 9, further comprising:
opening a second control valve, wherein the second control valve is arranged on the gas collection header, and the second control valve and the check valve are respectively arranged at two ends of the gas collection header;
and removing the second pipe plug to discharge the coal bed gas flow in the plurality of gas inlet pipelines and the gas collection header, wherein the second pipe plug is detachably arranged at the end part of one end of the gas collection header, which is far away from the external transmission pipeline, and the second control valve is positioned between the second pipe plug and the check valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112983361A (en) * | 2021-04-06 | 2021-06-18 | 马小飞 | Medicine adding and associated gas recovering device for cluster well group oil production well |
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