CN216197945U

CN216197945U - Matched artificial water re-injection facility for deep coal bed gas drainage and production

Info

Publication number: CN216197945U
Application number: CN202122627092.4U
Authority: CN
Inventors: 武玺; 李祥; 牛岳屾; 刘虎; 王峰峰; 程陆健; 杜永红; 许晋瑜; 赵星琦; 郭俊体
Original assignee: Shanxi Lanyan Coalbed Methane Group Co ltd
Current assignee: Shanxi Lanyan Coalbed Methane Group Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-05
Anticipated expiration: 2031-10-29

Abstract

The utility model belongs to the technical field of coal bed gas drainage and mining, and solves the problem that drainage and mining equipment cannot continuously and stably operate due to the fact that the liquid production amount is small and the capacity of carrying pulverized coal to be discharged is low in the later stage of deep coal bed gas drainage and mining operation. The utility model provides a supporting artifical reinjection water facility for deep coal bed gas is arranged and is adopted, the lower part is provided with the water injection pipe in the outer wall of reinjection water basin, the plastic-aluminum pipe includes earth's surface section and hypomere, earth's surface section one end is connected on the water injection pipe, the other end passes the horizontal union coupling of production tree in the lower section upper end in, be provided with the plunger pump in the reinjection water basin, be provided with first governing valve on the water injection pipe, the exit end of water injection pipe has second governing valve and plastic-aluminum pipe through little three way connection, the second governing valve passes through hose connection on the plunger pump. The utility model improves the liquid production capacity and the coal carrying capacity in the later period of the drainage and mining operation by additionally arranging a matched manual reinjection water facility, so that the drainage and mining equipment can continuously and stably operate.

Description

Matched artificial water re-injection facility for deep coal bed gas drainage and production

Technical Field

The utility model belongs to the technical field of coal bed gas drainage and mining, and particularly relates to a matched manual water injection facility for deep coal bed gas drainage and mining.

Background

Coal bed gas is rapidly developing in China as clean energy, deep coal bed gas increasingly becomes the key point of exploration and development, in order to expand the analysis range of the coal bed gas and improve the yield of the coal bed gas, an L-shaped horizontal well and a U-shaped horizontal well become main production well types for coal bed gas development, and the two horizontal wells are mostly drained and mined by screw pump equipment.

Because the coal seam is buried deeply, the liquid production amount is gradually reduced in the post-extraction period, the capability of transporting the coal dust is reduced, the coal dust is continuously settled and gathered in the pump cylinder, and finally the pump is blocked or the rod is broken to stop, so that clean water needs to be re-injected into the well from the ground, the continuous liquid production capability of the extraction equipment is maintained, and a proper amount of coal dust is carried to be discharged out of the ground.

Traditional water injection facility adopts hollow sucker rod for producing the liquid passageway, and the annular space between oil pipe and the sucker rod is water injection passageway, because horizontal well orbit inclination is great, the lower pump position is darker, and hollow sucker rod thin wall intensity is low, and in the drainage operation, hollow sucker rod continuous rotation is very easily worn and torn, leads to the sucker rod to break, can't accomplish the water injection operation.

Therefore, there is a need for improvement of the prior art to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a matched manual water injection facility for deep coal bed gas drainage and mining, which improves the capacity of the later-stage liquid production and the discharge of coal-carrying components in drainage and mining operation and ensures that drainage and mining equipment can continuously and stably run.

In order to achieve the purpose, the utility model adopts the following technical scheme that the matched manual reinjection water facility for deep coal bed methane drainage comprises a reinjection water tank and an aluminum-plastic pipe, wherein the reinjection water tank is arranged on the ground surface, a notch of the reinjection water tank is positioned below a liquid discharge pipe of a Christmas tree, the middle lower part of the outer wall of the reinjection water tank is provided with a water injection pipe, the aluminum-plastic pipe comprises a ground surface section and a downhole section, wherein, the outer wall and the bottom that the section is hung and is attached to oil pipe in the pit are located the pump descending degree of depth, earth's surface section one end is connected on the water injection pipe, the other end passes the horizontal union coupling of production tree and is in section upper end in the pit, be provided with the plunger pump in the reinjection water basin, be provided with first governing valve on the water injection pipe, the exit end of water injection pipe has second governing valve and plastic-aluminum pipe through little three way connection, the second governing valve passes through hose connection on the plunger pump, the upper portion of reinjection water basin is provided with the overflow pipe, the lower part is provided with the blow off pipe of taking the valve.

Preferably, the reinjection water tank is separated for A groove, B groove and C groove through two baffles, wherein, on water injection pipe, plunger pump and overflow pipe all set up C groove, the blow off pipe is three, sets up respectively on A groove, B groove and C groove, the upper portion of baffle is provided with the filter screen, and the fluid-discharge tube mouth of pipe of production tree stretches into in the A groove.

Preferably, the orifice of the drainage pipe of the Christmas tree is positioned at the corner of the groove A, the filter screen close to the orifice of the drainage pipe is positioned at the diagonal position of the orifice of the drainage pipe, and the filter screen far away from the orifice of the drainage pipe is positioned at the same side of the orifice of the drainage pipe.

Preferably, the downhole section of the aluminum-plastic pipe is fixed on the outer wall of the downhole oil pipe through a duplex centralizer.

Preferably, the bottom of the downhole section of the aluminum-plastic pipe is fixedly sleeved with an iron pipe, the bottom of the iron pipe is sealed, and holes are densely distributed in the upper part of the iron pipe.

Preferably, the earth's surface section of plastic-aluminum pipe is provided with big tee bend with the link of violently managing of production tree, the vertical section of big tee bend is connected with the manometer that is used for measuring casing pressure, the horizontal segment one end of big tee bend is connected on the violently pipe of production tree, the other end is connected with the screwed joint who plays sealed effect, screwed joint includes the thick screw thread portion at middle part and the thin screw thread portion at both ends, wherein, screwed joint's thick screw thread portion connects on big tee bend, the thin screw thread portion of left end is connected on the plastic-aluminum pipe in the violently pipe of production tree, the thin screw thread portion of right-hand member is connected with the third governing valve, the right-hand member of third governing valve is connected on the outer plastic-aluminum pipe of violently managing of production tree, screwed joint is inside hollow structure.

Preferably, the lower ends of the overflow pipe and the three sewage discharge pipes are connected to a long pipe, and the outlet end of the long pipe extends to a well site drainage pool.

Compared with the prior art, the utility model provides a matched artificial reinjection water facility for deep coal bed methane drainage and mining, which has the following beneficial effects:

1. according to the utility model, the aluminum-plastic pipe is arranged, and the produced liquid in the water tank is injected back into the well through the aluminum-plastic pipe, so that the overall durability of the reinjection water device is improved, and the reinjection water operation can be normally completed.

2. According to the utility model, by arranging the plunger pump, the reinjection effect is realized by the pressurizing of the plunger pump under the condition that the pressure exists in the well and water cannot be injected into the well by virtue of the natural liquid pressure difference.

3. According to the utility model, the plurality of sub-tanks are arranged, so that impurities such as coal dust and the like in the produced liquid are sequentially filtered, and the turbidity degree of the reinjection water is reduced.

The parts of the device not involved are the same as or can be implemented using prior art.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic view of the installation position of the present embodiment.

In the figure: 1-reinjection water tank; 1.1-A groove; 1.2-B groove; 1.3-C groove; 2-an aluminum-plastic pipe; 3-water injection pipe; 4-a plunger pump; 5.1-first regulating valve; 5.2-second regulating valve; 5.3-third regulating valve; 6-a hose; 7-an overflow pipe; 8-a sewage draining pipe; 9-a separator; 10-filtering the screen; 11-duplex centralizers; 12-an iron pipe; 13-long tube; 14-pressure gauge; 15-christmas tree; 16-a drain pipe; 17-a transverse pipe; 18-tubing; 19-a cannula; 20-a sucker rod; 21-motor driving; 22-screw pump; 23-a screen; 24-a threaded joint and 25-a large tee; 26-tail tube; 27-a sand setting pipe; 28-plug.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The present invention provides an embodiment:

a matched manual reinjection water facility for deep coal bed methane drainage and production comprises a reinjection water tank 1 and an aluminum-plastic pipe 2, wherein the reinjection water tank 1 is arranged on the ground surface, a notch of the reinjection water tank is positioned below a liquid discharge pipe 16 of a Christmas tree 15, a water injection pipe 3 is arranged at the middle lower part of the outer wall of the reinjection water tank 1, the aluminum-plastic pipe 2 comprises a ground surface section and a downhole section, wherein, the outer wall and the bottom of oil pipe 18 are located the pump-down degree of depth in the pit under well, earth's surface section one end is connected on water injection pipe 3, the other end passes the horizontal pipe 17 connection of production tree 15 in the pit under well upper end, be provided with plunger pump 4 in the reinjection water basin 1, be provided with first governing valve 5.1 on the water injection pipe 3, the exit end of water injection pipe 3 has second governing valve 5.2 and plastic-aluminum pipe 2 through little three way connection, second governing valve 5.2 passes through hose 6 and connects on plunger pump 4, the upper portion of reinjection water basin 1 is provided with overflow pipe 7, the lower part is provided with blow off pipe 8 of taking the valve.

As shown in fig. 1, in this embodiment, the reinjection water tank 1 is separated into a tank 1.1, a tank B1.2 and a tank C1.3 by two partition plates 9, the upper part of the partition plate 9 is provided with a filter screen 10, the orifice of the drainage tube 16 of the christmas tree 15 is located at the corner of the tank 1.1, the filter screen 10 close to the orifice of the drainage tube 16 is located at the diagonal position thereof, the filter screen 10 far away from the orifice of the drainage tube 16 is located at the same side thereof, and the partition plates 9 and the filter screen 10 are arranged, so that the liquid extracted from the production well enters the tank C1.3 provided with the water injection tube 3 through layer-by-layer filtration and precipitation, and the turbidity degree of the reinjection water is reduced.

The three drain pipes 8 are respectively arranged on the tank A1.1, the tank B1.2 and the tank C1.3, the drain pipes 8 are used for discharging the coal dust deposited at the bottom of the reinjection water tank 1, valves are arranged on the drain pipes 8, when the coal dust is deposited to a certain amount, the drain pipes 8 are opened to discharge the coal dust in the water tank, the turbidity of the reinjection water is reduced, and the drain pipes 8 are closed during normal operation; overflow pipe 7 sets up on C groove 1.3, and when the water level line was higher than overflow pipe 7 in reinjection water basin 1, produced liquid was discharged from overflow pipe 7, and the lower extreme of overflow pipe 7, three blow off pipe 8 is connected on a long tube 13, and the exit end of long tube 13 extends to well site drainage pond.

In this embodiment, plunger pump 4 is installed in C groove 1.3, and plunger pump 4's specification is 2Mpa, and plunger pump 4's concrete theory of operation is prior art, does not do this and does not describe repeatedly, and outside C groove 1.3's notch stretched out the groove can be crossed to the hose 6 be connected with plunger pump 4, the second governing valve 5.2 was used for controlling the intercommunication between hose 6 and the water injection pipe 3, and then adjusts the water injection volume through plunger pump 4.

A big tee 25 is arranged at the connecting end of the earth surface section of the aluminum-plastic pipe 2 and the horizontal pipe of the Christmas tree, the vertical section of the big tee 25 is connected with a pressure gauge 14 for measuring the pressure of the sleeve, one end of the horizontal section of the big tee 25 is connected with the horizontal pipe of the Christmas tree, the other end of the horizontal section of the big tee 25 is connected with a screwed joint 24 with sealing function, the screwed joint 24 comprises a thick screw thread part at the middle part and thin screw thread parts at the two ends, wherein, the thick screw thread portion of screwed joint 24 connects on big tee bend 25, the thin screw thread portion of left end is connected on the aluminium-plastic pipe 2 in the violently pipe of production tree, the thin screw thread portion of right-hand member is connected with third governing valve 5.3, the right-hand member of third governing valve 5.3 is connected on the aluminium-plastic pipe 2 outside the violently pipe of production tree, screwed joint 24 is inside to be hollow structure, first governing valve 5.1, second governing valve 5.2 and third governing valve 5.3 all are used for adjusting the water injection volume, screwed joint 24 is used for sealing up the clearance between aluminium-plastic pipe 2 and the big tee bend 25.

The underground section of the aluminum-plastic pipe 2 is fixed on the outer wall of an underground oil pipe 18 through a duplex centralizer 11, an iron pipe 12 is fixedly sleeved at the bottom of the underground section of the aluminum-plastic pipe 2, the bottom of the iron pipe 12 is sealed, holes are densely distributed in the upper portion of the iron pipe 12, in the embodiment, the iron pipe 12 is 15cm long, 10cm of the iron pipe is sleeved on the aluminum-plastic pipe 2, 5cm of the upper portion of the iron pipe is perforated, the perforated iron pipe 12 increases the air filtering effect, reinjection water enters an annular space formed between the oil pipe 18 and a sleeve 19 from the perforated position of the iron pipe 12, and is pumped by a rotor inside a screw pump 22, and the reinjection water and formation water in the annular space enter the pump through a screen pipe 23 and are pumped into a liquid discharge pipe 16 of a Christmas tree 15 from the oil pipe 18. (the solid sucker rod 20 is arranged in the oil pipe 18, the bottom of the solid sucker rod is connected with the rotor inside the screw pump 22, the screw pump 22 is arranged at the lower end of the oil pipe 18, the tail pipe 26 is arranged at the lower end of the screw pump 22, the sieve pipe 23 is arranged at the lower end of the tail pipe 26, the sand settling pipe 27 is arranged at the lower end of the sieve pipe 23, and the plug 28 is arranged at the lower end of the sand settling pipe 27.)

The working principle is as follows:

when the screw pump 22 equipment normally operates, downhole produced liquid is pumped to the orifice of the liquid discharge pipe 16 of the Christmas tree 15 and is discharged into the tank A1.1, coal powder is discharged after a certain amount of precipitation in the tank A1.1, the coal powder automatically filters through the filter screen 10 and flows into the tank B1.2 after the liquid level of the tank A1.1 rises, the coal powder is discharged after a certain amount of precipitation in the tank B1.2, the coal powder automatically filters through the filter screen 10 and flows into the tank C1.3 after the liquid level of the tank B1.2 rises, and the content of impurities such as the produced liquid coal powder in the tank C1.3 is minimum.

When the daily liquid production amount of the production well is normal, the first regulating valve 5.1, the second regulating valve 5.2 and the third regulating valve 5.3 are closed, and the liquid production water level is higher than the overflow pipe 7 and then is discharged to a well site drainage pool through the long pipe 13;

when the daily liquid production amount is small, the daily liquid production amount is lower than the normal liquid production amount, coal powder cannot be effectively discharged along with the liquid production amount, the first regulating valve 5.1 and the third regulating valve 5.3 are opened and regulated, the second regulating valve 5.2 is closed, the reinjection water amount is performed according to the size of the liquid production amount which needs to be reinjected, the reinjection water flows from the C groove 1.3 through the water injection pipe 3 and the aluminum-plastic pipe 2 to the bottom of the underground aluminum-plastic pipe 2, namely the depth position of a lower pump, the reinjection water enters the annular space between the oil pipe 18 and the sleeve 19 from the hole of the iron pipe 12 at the tail part of the aluminum-plastic pipe 2, the screw pump 22 operates for pumping, the formation liquid and the reinjection water enter the pump barrel and are discharged to the liquid discharge pipe 16 of the oil extraction tree 15 on the ground through the oil pipe 18, and the manual reinjection is realized in the whole flow, so that the liquid production-reinjection cycle is performed; (after the pump trouble or equipment power failure in the pit, the unable extraction of downhole production liquid, when leading to the liquid level of reinjection water basin 1 to drop to reinjection water pipe 3 below, no water reinjection, can persist the air in the pipe, when recovering the reinjection water equipment, because there is pressure in the well, can't pour into water into the well by liquid natural pressure difference, at this moment need open plunger pump 4, open and adjust second governing valve 5.2, keep first governing valve 5.1 and third governing valve 5.3 to open, fill up liquid in water injection pipe and plastic-aluminum pipe 2, at this moment because liquid level pressure is higher than in-well pressure, close plunger pump 4, close second governing valve 5.2, make liquid reinjection into the well naturally.)

When the daily liquid production volume is less and the casing pressure is great, because the influence of 19 internal pressures of sleeve pipes, in the nature reinjection water failed to pour into the well, at this moment, open and adjust second governing valve 5.2, start plunger pump 4 that is located C groove 1.3, utilize plunger pump 4 to carry out the short time and suppress the reinjection water for a few minutes, will reinjection water through plunger pump 4 suppress the hose 6 to the plastic-aluminum pipe 2 of entering connection in, suppress the reinjection water that gets into and link up with the original reinjection water of plastic-aluminum pipe 2 in the pit after, can realize the reinjection effect. At this time, the reinjection water forms a continuous reinjection water channel, and the plunger pump 4 can be closed to continue the reinjection water.

The standard parts used by the utility model can be purchased from the market, the special-shaped parts can be reformed and customized according to the description of the specification and the attached drawings, the specific connection mode of each part adopts conventional means such as mature bolts and welding in the prior art, and machines, parts and equipment adopt conventional models in the prior art, so that detailed description is omitted.

The volume of the reinjection water tank 1 used by the utility model can be manufactured according to the reinjection liquid amount required by the well, and the requirement of normal and stable operation can be met, which is different from well to well.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. A supporting artifical reinjection water facility for deep coal bed gas row is adopted which characterized in that: comprises a reinjection water tank (1) and an aluminum-plastic pipe (2), wherein the reinjection water tank (1) is arranged on the ground surface, a notch is positioned below a liquid discharge pipe of a Christmas tree, a water injection pipe (3) is arranged at the middle lower part of the outer wall of the reinjection water tank (1), the aluminum-plastic pipe (2) comprises a ground surface section and a well lower section, wherein the well lower section is hung on the outer wall of a downhole oil pipe, the bottom of the well lower section is positioned at the pump-down depth, one end of the ground surface section is connected on the water injection pipe (3), the other end of the ground surface section penetrates through a horizontal pipe of the Christmas tree and is connected with the upper end of the well lower section, a plunger pump (4) is arranged in the reinjection water tank (1), a first regulating valve (5.1) is arranged on the water injection pipe (3), the outlet end of the water injection pipe (3) is connected with a second regulating valve (5.2) and the aluminum-plastic pipe (2) through a hose (6), the second regulating valve (5.2) is connected on the plunger pump (4), an overflow pipe (7) is arranged at the upper part of the reinjection water tank (1), the lower part is provided with a sewage discharge pipe (8) with a valve.

2. The matched artificial reinjection water facility for deep coal bed methane drainage and production according to claim 1, wherein: the reinjection water tank (1) is divided into a tank A (1.1), a tank B (1.2) and a tank C (1.3) by two clapboards (9),

wherein, on water injection pipe (3), plunger pump (4) and overflow pipe (7) all set up C groove (1.3), blow off pipe (8) are three, set up respectively on A groove (1.1), B groove (1.2) and C groove (1.3), and the upper portion of baffle (9) is provided with filter screen (10), and the fluid-discharge tube mouth of pipe of production tree stretches into in A groove (1.1).

3. The matched artificial reinjection water facility for deep coal bed methane drainage and production according to claim 2, wherein: the orifice of the drainage pipe of the Christmas tree is positioned at the corner of the groove A (1.1), the filter screen (10) close to the orifice of the drainage pipe is positioned at the opposite corner, and the filter screen (10) far away from the orifice of the drainage pipe is positioned at the same side.

4. The matched artificial reinjection water facility for deep coal bed methane drainage and production according to any one of claims 1 to 3, wherein: the underground section of the aluminum-plastic pipe (2) is fixed on the outer wall of the underground oil pipe through a duplex centralizer (11).

5. The matched artificial reinjection water facility for deep coal bed methane drainage and production according to claim 4, wherein: the bottom of the underground section of the aluminum-plastic pipe (2) is fixedly sleeved with an iron pipe (12), the bottom of the iron pipe (12) is sealed, and holes are densely distributed in the upper portion of the iron pipe.

6. The matched artificial reinjection water facility for deep coal bed methane drainage and production according to claim 5, wherein: the connecting end of the earth's surface section of aluminium-plastic pipe (2) and the violently pipe of production tree is provided with big tee bend (25), the vertical section of big tee bend (25) is connected with manometer (14) that are used for measuring casing pressure, the horizontal segment one end of big tee bend (25) is connected on the violently pipe of production tree, the other end is connected with screwed joint (24) that play sealed effect, screwed joint (24) are including the thick screw thread portion at middle part and the thin screw thread portion at both ends, wherein, the thick screw thread portion of screwed joint (24) is connected on big tee bend (25), the thin screw thread portion of left end is connected on aluminium-plastic pipe (2) in the violently pipe of production tree, the thin screw thread portion of right-hand member is connected with third governing valve (5.3), the right-hand member of third governing valve (5.3) is connected on aluminium-plastic pipe (2) outside the violently pipe of production tree, screwed joint (24) inside is hollow structure.

7. The matched artificial reinjection water facility for deep coal bed methane drainage and production according to claim 6, wherein: the lower ends of the overflow pipe (7) and the three sewage discharge pipes (8) are connected to a long pipe (13), and the outlet end of the long pipe (13) extends to a well site drainage pool.