CN116856901A - Multiple filtration coal bed gas well reinjection water circulating device - Google Patents
Multiple filtration coal bed gas well reinjection water circulating device Download PDFInfo
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- CN116856901A CN116856901A CN202310682669.2A CN202310682669A CN116856901A CN 116856901 A CN116856901 A CN 116856901A CN 202310682669 A CN202310682669 A CN 202310682669A CN 116856901 A CN116856901 A CN 116856901A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 238000001914 filtration Methods 0.000 title claims abstract description 63
- 239000003245 coal Substances 0.000 title claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000010865 sewage Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 3
- 239000007924 injection Substances 0.000 claims abstract description 3
- 238000005192 partition Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000012530 fluid Substances 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 4
- 239000002817 coal dust Substances 0.000 description 18
- 239000004576 sand Substances 0.000 description 17
- 238000001556 precipitation Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 231100001010 corrosive Toxicity 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 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
- 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
- E21B43/40—Separation associated with re-injection of separated materials
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- 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)
- Filtration Of Liquid (AREA)
Abstract
The utility model provides a multiple filtration coal bed gas well reinjection water circulating device, belong to the coal bed gas and open the technical field of adopting, can solve the permeability of coal reservoir lower, stratum liquid supply ability subalternation and influence the problem of coal bed gas well productivity, include the circulation tank that comprises I level filtering ponds and II level filtering ponds, I level filtering ponds and II level filtering ponds separate through end baffle and perpendicular baffle, be equipped with the baffle in the I level filtering ponds, be equipped with the clearance between the bottom of baffle and the end baffle, I level filtering ponds's top is equipped with water inlet and water injection mouth, I level drain is equipped with to the bottom, perpendicular baffle's top is equipped with the overflow mouth; the bottom of one side of the II-level filter tank is provided with a water return port, the bottom of the other side of the II-level filter tank is provided with a II-level sewage outlet, the water return port is connected with a water return pipe, and a III-level filter is arranged in the water return pipe. By using the invention, the three-stage filtration of the water produced by the coal seam can be realized, so that the fluctuation range of the working fluid level in the shaft is stabilized, the filtered water can also clean the water suction port and the productivity channel, and the guarantee is provided for gas production.
Description
Technical Field
The invention belongs to the technical field of coalbed methane exploitation, and particularly relates to a reinjection water circulating device for a multi-filtering coalbed methane well.
Background
The permeability of coal reservoirs in China is low, the stratum liquid supply capacity is generally poor, and due to the double influences of geological factors such as bottom hole pressure fluctuation, fluid corrosion and the like and engineering factors such as fracturing, perforation, drainage and the like, along with the long-term drainage development of coal-bed gas fields, geological activities of underground deep parts are aggravated, and the working conditions of underground oil pumps become worse and the phenomenon of pump blockage is easy to occur due to various reasons such as sand production, powder production, pipe corrosion and the like of the coal reservoirs. At present, the number of gas wells for sand and powder discharge is increased at the positive speed, and the phenomenon of capacity reduction caused by the fact that the pumping unit cannot continuously operate is common, so that in order to maintain the stability of the working fluid level, the bottom hole pressure reduction speed is controlled, and the improvement of the pumping efficiency of the oil-well pump has become a key factor for promoting the stable and high yield of the coal-bed gas well.
The mechanical strength of the coal and rock is low, coal dust is produced by the coal bed gas well after gas is seen, and the coal dust is mainly fine coal dust with the grain size of 0.05-2 mm. After the coal powder enters the pump cylinder, the coal powder enters the oil pipe along with the up-and-down reciprocating motion of the plunger, the flowing speed of fluid in the oil pipe is larger than the sedimentation speed of the coal powder, so that the smooth discharge of the coal powder can be ensured, but due to the fact that the daily water yield of a coal-bed gas well is insufficient, part of the coal powder is sedimentated to form coal slime, the problems of pump blocking, pump leakage and the like are easily caused, and finally the well repairing rate of the coal-bed gas well is increased. In order to ensure the stable and continuous extraction of the coal-bed gas well and avoid the influence of a pump, the development of a multi-filtering water-reinjection circulating device for the coal-bed gas well is urgently needed, the purposes of stably controlling the liquid level and removing the coal dust are achieved, and the stable extraction of the coal-bed gas well is finally realized.
Disclosure of Invention
The invention provides a multi-filtering water-back circulation device for a coal-bed gas well, aiming at the problems that the permeability of a coal reservoir is low, the liquid supply capacity of the stratum is poor, particularly, after a coal-bed gas well sees gas, the water phase permeability is rapidly reduced, the liquid production capacity is reduced, the liquid level is reduced too rapidly due to improper drainage control, coal is easy to produce coal dust and the like, thereby influencing the capacity of the coal-bed gas well.
The invention adopts the following technical scheme:
the utility model provides a multiple filtration coal bed gas well reinjection water circulating device, include the circulation tank that comprises I level filtering ponds and II level filtering ponds, wherein, I level filtering ponds and II level filtering ponds pass through bottom baffle and perpendicular baffle separation, bottom baffle and perpendicular baffle are connected with the lateral wall of circulation tank respectively, be equipped with the baffle in the I level filtering ponds, be equipped with the clearance between the bottom of baffle and the bottom baffle, I level filtering ponds's top is equipped with water inlet and water filling port, the effect of water filling port is, can add water to circulation tank through the water filling port, the water inlet is connected with the inlet tube, the bottom is equipped with I level drain, the top of perpendicular baffle is equipped with the overflow mouth; the bottom of one side of the II-level filter tank is provided with a water return port, the bottom of the other side of the II-level filter tank is provided with a II-level sewage outlet, the water return port is connected with a water return pipe, and a III-level filter is arranged in the water return pipe.
Further, a valve is arranged in the water inlet pipe.
Further, the I-level sewage outlet is connected with a sewage pipe I, and a valve is arranged in the sewage pipe I.
Further, the II-level sewage outlet is connected with a sewage pipe II, and a valve is arranged in the sewage pipe II.
Further, one end of the blow-down pipe I and one end of the blow-down pipe II are connected with a blow-down pool.
Further, the gap between the bottom of the partition plate and the bottom baffle plate is 5-10cm.
Further, the position of the water return port is higher than the position of the II-level sewage outlet.
Further, one end of the II-stage filter tank is connected with a communicated liquid level meter.
Further, valves are respectively arranged at the front end and the rear end of the III-level filter in the reinjection water pipe.
Further, one end of the reinjection pipe is connected to the annulus between the oil pipe and the casing.
The invention mainly uses the oil pump to discharge the water containing coal dust underground from the coal bed gas well, and then flows to the position of the water suction port of the pump barrel along the reinjection pipeline after multiple filtration and precipitation, so that the relatively clean water can continuously wash the sieve tube, the flowing circulating water can also continuously bring the coal dust in the shaft to the ground, the smoothness of the water suction port can be ensured, the pump efficiency can be improved, the well repairing frequency can be reduced, and the purpose of cleaning sediment in the shaft can be achieved, thereby realizing continuous and stable drainage and production of the coal bed gas well. The device is particularly suitable for coal-bed gas wells with more coal dust, poorer stratum liquid supply capacity, lower water yield and larger liquid level fluctuation range.
The beneficial effects of the invention are as follows:
1. the invention can realize three-stage filtration of coal bed produced water for the coal bed gas well with poor stratum liquid supply capability and easy coal bed coal dust discharge, thereby stabilizing fluctuation amplitude of the working fluid level in the shaft, and the filtered water can clean the water suction port and the productivity channel, thereby providing guarantee for gas production.
2. The invention can realize cyclic utilization of water produced from coal seam, reduce corrosion of underground oil pump, sieve tube and production sleeve, and clean sediment in shaft.
3. After the invention is additionally arranged on the coal-bed gas well, the pump detection period and the service life of the motor can be prolonged, and continuous and stable drainage and production of the coal-bed gas well are realized.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic representation of the use of the present invention;
wherein: a 1-I stage filter tank; a 2-II stage filter tank; 3-a bottom baffle; 4-erecting a baffle; 5-a separator; 6-a water inlet; 7-a water filling port; 8-a water inlet pipe; a 9-I grade sewage outlet; 10-overflow port; 11-a water return port; a 12-II-level sewage outlet; 13-a reinjection pipe; a 14-III stage filter; 15-valve; 16-a blow-down pipe I; 17-a blow-down pipe II; 18-a sewage disposal tank; 19-a communicating type liquid level meter; 20-manual well bottom; 21-plugging; 22-sand setting pipe; 23-sieve tube; 24-coal bed; 25-oil pump; 26-producing a casing; 27-working fluid level; 28-sucker rod; 29-surface layer sleeve; 30-ground; 31-gas line; 32-water line.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in figure 1, a multi-filtering coal-bed gas well reinjection water circulation device adopts a three-stage filtering reinjection system formed by welding common steel plates, and comprises a circulation water tank consisting of a first-stage filtering tank 1 and a second-stage filtering tank 2, wherein the first-stage filtering tank 1 and the second-stage filtering tank 2 are separated by a bottom baffle 3 and a vertical baffle 4, the bottom baffle 3 and the vertical baffle 4 are respectively connected with the side wall of the circulation water tank, a baffle 5 is arranged in the first-stage filtering tank 1, a gap is arranged between the bottom of the baffle 5 and the bottom baffle 3, the top of the first-stage filtering tank 1 is provided with a water inlet 6 and a water injection port 7, the water inlet 6 is connected with a water inlet pipe 8, the bottom is provided with a first-stage sewage outlet 9, and the top of the vertical baffle 4 is provided with an overflow port 10; the bottom of one side of the II-level filter tank 2 is provided with a water return port 11, the bottom of the other side is provided with a II-level sewage outlet 12, the water return port 11 is connected with a water return pipe 13, and a III-level filter 14 is arranged in the water return pipe 13.
The circulating water tank is of an upper layer structure and a lower layer structure, the inner part of the upper layer structure is provided with a partition plate, the size of the circulating water tank can be formulated according to the water yield of a stratum, and a common structure is formed by welding common steel plates with the length of 2 meters, the width of 1.5 meters and the height of 1.5 meters.
As shown in fig. 2, a schematic diagram of a multi-filtering coal-bed gas well reinjection water circulation flow is shown, and the flow direction of water is as follows: the method comprises the steps of coal reservoir productivity channel-coalbed methane shaft-screen pipe-oil pipe-drainage pipeline-reinjection water device-water return pipe-oil sleeve annulus-screen pipe (repeated above).
The circulation process of the invention is as follows:
(1) Well selection preparation: and selecting a well with large coal dust, and carrying out pump detection and pump adjustment treatment, wherein the water suction port is 3-5m below the bottom plate of the target coal seam.
In the preparation of well selection, the sand surface is needed to be detected when the pump is detected, if the sand surface exceeds 20 meters, sand is fished, and two sand settling pipes are connected below the pump.
(2) Stage I filtration system: the water containing coal dust and fracturing sand flows into a shaft through a coal reservoir perforation channel, enters an oil pipe from a screen pipe under the suction effect of an oil pump, is lifted to a ground liquid outlet, enters a liquid inlet of a reinjection water device along a drainage pipeline, finally enters a stage I filtering system, and completes preliminary precipitation and filtering of water produced by a coal-bed gas well.
The water in the drainage pipeline entering the reinjection water device enters the filtering system in the partition board firstly, so that the drainage board (partition board) with the space of 5-10cm is required to be arranged at the bottom in the system in order to ensure the sufficient filtration and precipitation of produced water, and the water flows out from the overflow port at the upper part after the sufficient precipitation in the system in the flowing direction from bottom to top.
In the I-level filtering system, the middle partition plate and the baffle plate are required to be tightly welded with the box body, and the water pressure test is required before use, so that no leakage phenomenon exists.
(3) Stage ii filtration system: and when the water after precipitation and filtration of the grade I filtering system reaches the overflow port, the water starts to continuously flow into the grade II filtering system to finish secondary precipitation and filtration.
In order to ensure the sufficient sedimentation of water and the convenient observation of water level, a liquid level meter of a communication device is arranged outside the system, the position of the liquid level can be reflected in real time, the observation hole at the upper part can see the sediment condition of the bottom sludge, and the cleaning is carried out regularly.
The liquid level meter can be set into a floating ball direct reading type or an electronic sensing type, and can realize well site direct reading or remote liquid level position transmission.
(4) Class III filtration system: and after the water subjected to precipitation and filtration of the II-stage filtration system is fully precipitated, opening a valve on a reinjection pipeline, and flowing into the III-stage filtration device through a reinjection port to finish three times of filtration.
The system is a filter between reinjection water and an oil sleeve annulus, ensures that the water reinjected into a shaft is further purified, and is internally provided with a filter element which can be detached and cleaned, and the pollution degree of the filter element is periodically detected and timely cleaned or replaced.
(5) Reinjection circulation system: and the water after the tertiary filtration finally flows into the annulus between the oil pipe and the sleeve through the reinjection pipeline, and the water containing the pulverized coal and the fracturing sand is sucked into the oil pipe from the sieve tube again through the suction effect of the oil pump and then lifted to the ground reinjection water device, so that the once reinjection water circulation process is finally completed.
The water after tertiary purification flows into the oil sleeve annulus through the reinjection pipeline, flows into the water suction port again by self gravity and the suction force of the oil pump, flushes the perforation holes and the sieve tube holes, and can bring pulverized coal deposited in the shaft and attached to the pipe wall into the oil pipe, and the reinjection water operation is finally completed by circulating the steps.
In the well selection preparation, a sand detection surface is needed when a pump is detected, if the sand surface exceeds 20 meters, sand bailing treatment is carried out, and two sand setting pipes are connected below the pump.
The concrete construction process is as follows:
1. wellsite preparation
(1) Unloading, hanging the horsehead, and lifting the polish rod, the sucker rod and the piston;
(2) Lifting the hanger, and taking the sand detection surface of the pump under the well pipe column, and carrying out sand fishing treatment if the sand detection surface exceeds 20 meters after the actual measurement;
(3) Checking the abrasion condition of the pump cylinder and the piston, and changing the pump if the abrasion is serious;
(4) After the pump is detected, a well completion pipe string is arranged and connected with the pumping unit and the ground reinjection water device.
2. Reinjection water circulation operation
(1) After the reinjection water device is connected, the pumping unit is started, the stroke frequency is not too fast, and the stability of water outlet and liquid level fluctuation is ensured.
(2) When the oil pipe is filled with water, the water enters the I-stage filtering system along the drainage pipeline, primary precipitation occurs under the action of the baffle plate (drainage plate), and the water flows out from the upper overflow port after being filled with water;
(3) The water flowing out of the overflow port enters the II-stage filtering system, and meanwhile, the liquid level meter displays the position of the liquid surface, and after the water after secondary sedimentation reaches the height of the reinjection pipe, the water flows into the reinjection pipe.
(4) The water of the reinjection pipeline enters a III-level filtering system, is further purified through the action of the filter element, and finally flows into the oil collar.
(5) The reinjection water returns to the oil pipe under the suction action of the pump, and the steps are repeated.
3. Abnormal condition analysis: the three-stage filtering system is required to regularly observe sediment accumulation conditions such as coal dust and the like, and the purification work is finished through a specific sewage outlet or a cleaning filter element, so that more reinjection water suspended matters can be caused if improper cleaning is carried out, and the reinjection effect is influenced.
Application instance
The device is developed and applied jointly by a key laboratory and a patent completion unit in a country where coal and coal bed gas are co-produced, coal dust is contained in a coal bed gas well at a water-seepage Zheng Zhuang block part, the stratum liquid supply capacity is poor, the water yield is low, the fluctuation amplitude of the liquid level is large, water containing coal dust is discharged underground through the device and enters the water suction port position along a reinjection pipeline after being subjected to multiple filtration and precipitation, relatively clean water is enabled to be used for flushing a screen pipe under the well all the time, the coal dust is continuously brought to the ground, the smoothness of the water suction port is guaranteed, and accordingly continuous and stable drainage and production of the coal bed gas well are achieved.
According to analysis of the reason for the gas flow reduction of the coal bed gas drainage well, discontinuous drainage is considered to have great influence on a reservoir and drainage equipment:
(1) Effects on reservoirs:
A. the pressure of the coal bed is redistributed, the stratum liquid of the channel is retained, and the gas production channel is reduced.
B. The liquid carries the coal dust to deposit and blocks the gas producing channel.
(2) Influence on extraction equipment:
A. the liquid level is continuously raised, so that the pumping unit repeatedly runs under a large load, and the failure rate is increased.
B. The buried depth is large, the fixed valve is blocked by the deposition of coal dust in the oil pipe, the pump efficiency is reduced, and the pump is blocked seriously.
Therefore, in order to ensure continuous and stable drainage of the coalbed methane well, five wells of the reinjection water device are installed and applied in the block, and practice shows that: the period of the pump (workover) is prolonged and the workover frequency is reduced, the workover frequency is prolonged to annual time from the previous three months, the continuous and stable extraction of the coal-bed gas well is realized, residues (coal dust, fracturing sand, corrosives and the like) in the well are discharged back to the ground, the smoothness of a gas production channel is ensured, the yield of the coal-bed gas well is improved, and the yield of the single-well gas production is increased by 1500m maximally than the previous one 3 Average yield increase of five wells is 1200m 3 And/d, has better economic benefit and is worthy of popularization and application in similar blocks.
Claims (10)
1. The utility model provides a multiple filtration coal bed gas well reinjection water circulating device which characterized in that: the water circulation device comprises a circulating water tank consisting of a first-stage filter tank (1) and a second-stage filter tank (2), wherein the first-stage filter tank (1) and the second-stage filter tank (2) are separated by a bottom baffle (3) and a vertical baffle (4), the bottom baffle (3) and the vertical baffle (4) are respectively connected with the side wall of the circulating water tank, a partition plate (5) is arranged in the first-stage filter tank (1), a gap is arranged between the bottom of the partition plate (5) and the bottom baffle (3), the top of the first-stage filter tank (1) is provided with a water inlet (6) and a water injection port (7), the water inlet (6) is connected with a water inlet pipe (8), the bottom is provided with a first-stage sewage outlet (9), and the top of the vertical baffle (4) is provided with an overflow port (10); the bottom of one side of the II-level filter tank (2) is provided with a water return port (11), the bottom of the other side is provided with a II-level sewage outlet (12), the water return port (11) is connected with a water return pipe (13), and a III-level filter (14) is arranged in the water return pipe (13).
2. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 1, wherein: a valve (15) is arranged in the water inlet pipe (8).
3. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 1, wherein: the I-level sewage outlet (9) is connected with a sewage pipe I (16), and a valve is arranged in the sewage pipe I (16).
4. A multi-filtration coal bed gas well reinjection water circulating device according to claim 3, wherein: the II-level sewage outlet (12) is connected with a sewage pipe II (17), and a valve is arranged in the sewage pipe II (17).
5. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 4, wherein: one end of the blow-down pipe I (16) and one end of the blow-down pipe II (17) are connected with a blow-down pool (18).
6. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 1, wherein: the gap between the bottom of the partition board (5) and the bottom baffle (3) is 5-10cm.
7. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 1, wherein: the position of the water return opening (11) is higher than the position of the II-level sewage outlet (12).
8. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 1, wherein: one end of the II-stage filter tank (2) is connected with a communicating type liquid level meter (19).
9. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 1, wherein: valves are respectively arranged at the front end and the rear end of a III-level filter (14) in the reinjection pipe (13).
10. The multi-filtering coal-bed gas well reinjection water circulating device according to claim 1, wherein: one end of the reinjection pipe (13) is connected to the annular space between the oil pipe and the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310682669.2A CN116856901A (en) | 2023-06-09 | 2023-06-09 | Multiple filtration coal bed gas well reinjection water circulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310682669.2A CN116856901A (en) | 2023-06-09 | 2023-06-09 | Multiple filtration coal bed gas well reinjection water circulating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116856901A true CN116856901A (en) | 2023-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310682669.2A Pending CN116856901A (en) | 2023-06-09 | 2023-06-09 | Multiple filtration coal bed gas well reinjection water circulating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116856901A (en) |
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2023
- 2023-06-09 CN CN202310682669.2A patent/CN116856901A/en active Pending
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