CN111042773A - Low-pressure coal bed gas well emptying and recycling linkage device - Google Patents
Low-pressure coal bed gas well emptying and recycling linkage device Download PDFInfo
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- CN111042773A CN111042773A CN201911331609.6A CN201911331609A CN111042773A CN 111042773 A CN111042773 A CN 111042773A CN 201911331609 A CN201911331609 A CN 201911331609A CN 111042773 A CN111042773 A CN 111042773A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
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Abstract
The invention relates to a low-pressure coal bed gas well emptying and recovery linkage device, belonging to the technical field of coal bed gas recovery; the system comprises a control system, and an automatic ignition system and a recovery system which are respectively connected with the control system, wherein the automatic ignition system is used for igniting and burning the emptying gas when the gas production pressure is too low to reach the recovery condition or the recovery system needs to be overhauled; the control system is used for realizing the independent operation of the automatic ignition system or the recovery system according to the switching request; the recovery system is used for separating moisture and impurities in the coal bed gas, and pressurizing or compressing and liquefying the coal bed gas: the invention has the function of linkage of emptying and recovery, can realize mutual switching between automatic ignition and emptying gas recovery, improves the energy utilization efficiency and reduces the environmental pollution.
Description
Technical Field
The invention discloses a low-pressure coal bed gas well emptying and recovering linkage device, and belongs to the technical field of coal bed gas recovery.
Background
The venting torch system is an indispensable safety facility in the production of the gas industry, and the venting torch system is used for combusting combustible gas discharged during normal production and in an accident state. In the production process of the coal bed gas well, due to the fact that a pipeline is not timely connected in the initial drainage and production stage or the pipeline is in fault, the pressure of produced gas is too low and the like, a part of gas is discharged and burnt, some gas wells still adopt a manual ignition mode when a discharge torch is ignited, danger is high, the accumulated amount of the discharged gas is considerable, and certain economic and social benefits can be brought if the gas is recycled. In addition, as the coal bed gas slab expands, the construction of the pipeline infrastructure of the new block lags behind, and the development of the coal bed gas is bound to face the problem of gathering and transportation. Therefore, in order to maximize the energy utilization, reduce environmental pollution and ensure safe production, it is necessary to develop a device capable of realizing automatic ignition and recycling the vented gas.
Disclosure of Invention
The invention provides a linkage device for emptying and recovering a low-pressure coal-bed gas well, overcomes the defects in the prior art, has the function of linkage of emptying and recovering, and can realize mutual switching of automatic ignition and emptying gas recovery.
In order to solve the technical problems, the invention adopts the technical scheme that: a low-pressure coalbed methane well emptying and recovery linkage device comprises a control system, and an automatic ignition system and a recovery system which are respectively connected with the control system, wherein,
the automatic ignition system is used for igniting and burning the emptying gas when the gas production pressure is too low to reach the recovery condition or the recovery system needs to be overhauled;
the control system is used for realizing the independent operation of the automatic ignition system or the recovery system according to the switching request;
the recovery system is used for separating moisture and impurities in the coal bed gas and pressurizing or compressing and liquefying the coal bed gas.
Furthermore, the automatic ignition system comprises an emptying valve, a fire retardant valve and a high-altitude igniter, and the emptying gas is ignited by the high-altitude igniter after passing through the emptying valve and the fire retardant valve in sequence through a pipeline.
Furthermore, the recovery system comprises a recovery ball valve, a one-way valve, a gas-water separator and a movable skid-mounted compressor, the recovery ball valve is connected with an upstream section pipeline of the emptying valve through a pipeline, emptying gas enters the gas-water separator to remove moisture and impurities after sequentially passing through the recovery ball valve and the one-way valve, an outlet of the gas-water separator is communicated with the movable skid-mounted compressor, and the movable skid-mounted compressor compresses the emptying gas.
Furthermore, the emptying valve and the recovery ball valve are electrically operated valves, the control system comprises a cabinet, and a main circuit and a control circuit are arranged in the cabinet;
in the main circuit, a working power supply is divided into three branches sequentially through a breaker QF, and in the first branch, a coil of a first thermal relay FR1, a first contactor KM1 and a control end of the recovery ball valve are connected in series; in the second branch, a coil of a second thermal relay FR2, a second contactor KM2 and a control end of the relief valve are connected in series; in the third branch, a coil of a third thermal relay FR3, a third contactor KM3 and a power supply end of the high altitude igniter are connected in series;
the control circuit comprises a PLC controller, a first button SB1 and a second button SB2, the input end of the PLC controller is respectively connected with the button SB1, the button SB2, the normally open contact of the first thermal relay FR1, the normally open contact of the second thermal relay FR2 and the normally open contact of the third thermal relay FR3, and the output end of the PLC controller is respectively connected with the coil of the first contactor KM1, the coil of the second contactor KM2 and the coil of the third contactor KM 3.
Furthermore, a drain valve is arranged at the bottom of the gas-water separator.
Compared with the prior art, the invention has the following beneficial effects.
According to the coal bed gas production characteristics, the gas which is originally required to be emptied can be recycled, and the resource waste caused by direct emptying or combustion is avoided. The device integrates emptying and recovery, can improve the energy utilization efficiency to the maximum extent, and reduces the environmental pollution.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic diagram of a main circuit according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a control circuit according to a first embodiment of the present invention.
Fig. 4 is a schematic circuit diagram according to a second embodiment of the present invention.
In the figure, 1-an automatic ignition system, 2-an overhead igniter, 3-a fire relief valve, 4-an emptying valve, 5-a control system, 6-a cabinet, 7-emptying gas, 8-a recovery system, 9-a recovery ball valve, 10-a one-way valve, 11-a gas-water separator, 12-a blow-down valve and 13-a mobile skid-mounted compressor.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example one
As shown in FIG. 1, the low-pressure coalbed methane well emptying and recovery linkage device comprises a control system 5, and an automatic ignition system 1 and a recovery system 8 which are respectively connected with the control system 5, wherein the automatic ignition system 1 is used for igniting and combusting the emptying gas 7 when the gas production pressure is too low to reach the recovery condition or the recovery system 8 needs to be overhauled. The control system 5 is used to implement the individual operation of the auto-ignition system 1 or the recovery system 8 according to the switching request. The recovery system 8 is used for separating moisture and impurities in the coal bed gas and pressurizing or compressing and liquefying the coal bed gas. The recovered gas can enter an external transportation pipeline or be loaded on a truck for transportation.
The automatic ignition system 1 comprises an emptying valve 4, a fire retardant valve 3 and a high-altitude igniter 2, and emptying gas 7 passes through the emptying valve 4 and the fire retardant valve 3 in sequence through a pipeline and then is ignited by the high-altitude igniter 2.
Recovery system 8 is including retrieving ball valve 9, check valve 10, gas-water separator 11 and removal skid-mounted compressor 13, retrieves ball valve 9 and links to each other through the upper reaches section pipeline of pipeline with blow-down valve 4, and atmospheric gas 7 enters into gas-water separator 11 after retrieving ball valve 9 and check valve 10 in proper order and gets rid of moisture and impurity, and the export of gas-water separator 11 is linked together with removal skid-mounted compressor 13, and removal skid-mounted compressor 13 compresses atmospheric gas 7. The mobile skid-mounted compressor 13 can also be used for coal bed gas liquefaction. The bottom of the gas-water separator 11 is provided with a blow-off valve 12.
The emptying valve and the recovery ball valve 9 are electrically operated valves, the control system 5 comprises a cabinet 6, and a main circuit and a control circuit are arranged in the cabinet 6.
As shown in fig. 2, in the main circuit, the working power supply is divided into three branches sequentially through the breaker QF, and in the first branch, the coil of the first thermal relay FR1, the first contactor KM1 and the control end of the recovery ball valve 9 are connected in series; in the second branch, a coil of a second thermal relay FR2, a second contactor KM2 and a control end of a blow valve 4 are connected in series; in the third branch, the coil of the third thermal relay FR3, the third contactor KM3 and the power supply terminal of the high altitude igniter 4 are connected in series.
As shown in fig. 3, the control circuit includes a PLC controller, a first button SB1 and a second button SB2, input terminals of the PLC controller are respectively connected to the button SB1, the button SB2, a normally open contact of the first thermal relay FR1, a normally open contact of the second thermal relay FR2, and a normally open contact of the third thermal relay FR3, and output terminals of the PLC controller are respectively connected to a coil of the first contactor KM1, a coil of the second contactor KM2, and a coil of the third contactor KM 3. The coil of the second contactor KM2 and the coil of the third contactor KM3 were connected in parallel and shared one output terminal of the PLC controller.
When the air is required to be recycled in the emptying state, the switch SB1 is pressed to switch on the coil of the output KM1, the normally open contact of KM1 is closed, and the coil of the recycling ball valve 9 is electrified to generate magnetic field force to open the valve core for gas recycling. At this time, the atmospheric valve 4 and the high altitude igniter 2 are in the closed state.
When the recovery system is in maintenance or failure, a switch SB2 is pressed, an alternating current contactor KM2 and KM3 are connected, normally open contacts KM2 and KM3 are closed, a coil of an emptying valve 4 is electrified, and the emptying valve is opened; the coil of the high altitude igniter 2 is electrified for ignition. At this time, the recovery ball valve 9 is closed. The whole system achieves linkage.
Example two
For the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described.
As shown in fig. 4, the main circuit and the control circuit are implemented by using a relay, and the working process is the same as that of the first embodiment. The main circuit is the same as the first embodiment, and the control circuit electrically interlocks the KM1, KM2 and KM 3. That is, when the coil of KM1 was powered on, KM2 and KM3 were powered off. When the coils of KM2 and KM3 were powered on, the coil of KM1 was powered off.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (5)
1. A low-pressure coalbed methane well emptying and recovery linkage device is characterized by comprising a control system (5), and an automatic ignition system (1) and a recovery system (8) which are respectively connected with the control system (5),
the automatic ignition system (1) is used for igniting and burning the emptying gas (7) when the gas production pressure is too small to reach the recovery condition or the recovery system (8) needs to be overhauled;
the control system (5) is used for realizing the independent operation of the automatic ignition system (1) or the recovery system (8) according to the switching request;
the recovery system (8) is used for separating moisture and impurities in the coal bed gas and pressurizing or compressing and liquefying the coal bed gas.
2. The low-pressure coalbed methane well emptying and recovery linkage device as claimed in claim 1, characterized in that: the automatic ignition system (1) comprises an emptying valve (4), a fire retardant valve (3) and a high-altitude igniter (2), and emptying gas (7) is ignited by the high-altitude igniter (2) after passing through the emptying valve (4) and the fire retardant valve (3) in sequence through a pipeline.
3. The low-pressure coalbed methane well emptying and recovery linkage device as claimed in claim 2, characterized in that: recovery system (8) including retrieving ball valve (9), check valve (10), deareator (11) and removal sled dress formula compressor (13), retrieve ball valve (9) through the pipeline with the upper reaches section pipeline of atmospheric valve (4) links to each other, atmospheric gas (7) get into deareator (11) according to the preface through retrieving ball valve (9) and check valve (10) and get rid of moisture and impurity, and the export of vapor-water separator (11) is linked together with removal sled dress formula compressor (13), and it is right to remove sled dress formula compressor (13) atmospheric gas (7) compress.
4. The low-pressure coalbed methane well emptying and recovery linkage device as claimed in claim 3, characterized in that: the emptying valve and the recovery ball valve (9) are electrically operated valves, the control system (5) comprises a cabinet (6), and a main circuit and a control circuit are arranged in the cabinet (6);
in the main circuit, a working power supply is divided into three branches sequentially through a breaker QF, and in the first branch, a coil of a first thermal relay FR1, a first contactor KM1 and a control end of the recovery ball valve (9) are connected in series; in the second branch, a coil of a second thermal relay FR2, a second contactor KM2 and a control end of the emptying valve (4) are connected in series; in the third branch, a coil of a third thermal relay FR3, a third contactor KM3 and a power supply end of the high-altitude igniter (4) are connected in series;
the control circuit comprises a PLC controller, a first button SB1 and a second button SB2, the input end of the PLC controller is respectively connected with the button SB1, the button SB2, the normally open contact of the first thermal relay FR1, the normally open contact of the second thermal relay FR2 and the normally open contact of the third thermal relay FR3, and the output end of the PLC controller is respectively connected with the coil of the first contactor KM1, the coil of the second contactor KM2 and the coil of the third contactor KM 3.
5. The low-pressure coalbed methane well emptying and recovery linkage device as claimed in claim 3, characterized in that: a drain valve (12) is arranged at the bottom of the gas-water separator (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911331609.6A CN111042773B (en) | 2019-12-21 | 2019-12-21 | Low-pressure coal bed gas well emptying and recycling linkage device |
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| CN201911331609.6A CN111042773B (en) | 2019-12-21 | 2019-12-21 | Low-pressure coal bed gas well emptying and recycling linkage device |
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| CN111042773A true CN111042773A (en) | 2020-04-21 |
| CN111042773B CN111042773B (en) | 2021-11-12 |
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