CN106869867B - Washable coalbed methane extraction equipment - Google Patents

Abstract

The invention relates to a coalbed methane mining equipment, which is a well-washable coalbed methane drainage equipment, including an oil pipe, a hollow rod and a well-flushing drainage pump. The well flushing drainage pump includes a tubing joint, the upper end of the tubing joint is connected to the tubing, the outer wall of the lower part of the tubing joint is connected to the outer cylinder, the lower end of the outer tube is connected to the tail joint, the inner wall of the lower part of the tubing joint is connected to the pump barrel, the upper part of the pump barrel is equipped with a plunger, and the upper end of the plunger is connected to the pump barrel. Hollow rod, the lower part of the plunger is equipped with a floating valve, the inner middle of the pump barrel is equipped with a fixed valve, the outer wall of the lower part of the pump cylinder is covered with a sliding sleeve, the lower part of the sliding sleeve is connected to a spring, and the lower end of the spring is connected to the tail joint. During the production process, the invention can carry out the oil pipe washing operation at any time, without damaging the coal seam, and can wash out the coal powder in the pump cylinder and the liquid production pipe to the ground, thereby reducing the pump inspection cycle.

Description

Washable coalbed methane extraction equipment

technical field

The invention relates to a coalbed methane mining equipment, in particular to a well-washable coalbed methane drainage equipment used for coalbed methane development.

Background technique

In the process of developing coalbed methane with the existing coalbed methane drainage equipment, with the reduction of coalbed water, the produced water in the coalbed is getting less and less, and the content of coal powder in the produced water is getting higher and higher. In addition, after the coalbed methane production well is fractured, There will also be high coal powder content, and the fine coal particles (sand) in the tubing will continue to deposit under the action of its own weight, causing pump valve blockage or pump jamming; currently only through frequent workover operations to check the pump to solve the problem , which reduces the time for normal drainage and gas recovery, and increases the workover cost.

Contents of the invention

The object of the present invention is to provide a well-washable coalbed methane extraction equipment that can carry out oil pipe flushing operations at any time, prevent coal powder from clogging pump valves or pumps, and reduce pump inspection cycles.

Technical scheme of the present invention is:

Well-washable coalbed methane drainage equipment includes oil pipe, hollow rod and well-washing drainage pump. The upper end of the joint is connected to the oil pipe, the inner wall of the lower part of the oil pipe joint is provided with a boss, and the boss is opened with a communication hole, the outer wall of the lower part of the oil pipe joint is connected to the outer cylinder, the lower end of the outer cylinder is connected to the tail joint, the inner wall of the lower part of the oil pipe joint is connected to the pump barrel, and the upper part of the pump barrel is installed with a column Plug, the upper end of the plunger is connected to the hollow rod, the plunger is a hollow structure, the lower part of the plunger is equipped with a floating valve, the inner middle of the pump barrel is equipped with a fixed valve, the pump cylinder has a well washing hole at the fixed valve, and the lower part of the pump cylinder The outer wall is covered with a sliding sleeve, the middle part of the sliding sleeve is provided with a pressure balance hole, the outer wall of the sliding sleeve is provided with an annular sealing boss, the lower part of the sliding sleeve is connected to a spring, and the lower end of the spring is connected to a tail joint.

The upper end of the plunger is integrally connected with the hollow pull rod, the upper end of the hollow pull rod is provided with a hollow rod joint, and the hollow rod joint is connected with the hollow rod.

An upper moving valve and a lower moving valve are arranged inside the plunger, and an upper fixed valve and a lower fixed valve are arranged inside the pump barrel.

The well flushing hole is located at the lower fixed valve.

The inner wall of the lower part of the outer cylinder is provided with a sliding sleeve seat.

The upper part of the hollow rod communicates with the liquid outlet pipeline, and the water injection skid communicates with the annular space of the hollow rod and the tubing through the well flushing pipeline.

In the process of realizing the production, the invention can carry out the oil pipe washing operation at any time, without damaging the coal seam, and can wash out the coal powder in the pump barrel and the liquid production pipe to the ground, completely preventing the coal powder from clogging the pump valve or pump stuck phenomenon. occurrence, reduce the pump inspection cycle, promote the continuous and stable drainage and production, and reduce the drainage and production cost.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of the well flushing drainage pump.

1 Hollow Rod Joint 2 Hollow Pull Rod 3 Tubing Joint 4 Upstream Valve 5 Plunger 6 Downstream Mobile Valve 7 Pump Barrel 8 Upper Fixed Valve 9 Lower Fixed Valve 10 Outer Cylinder 11 Sliding Sleeve 12 Spring 13 Tail Joint 14 Ring Sealing boss 15 Hollow rod 16 Well washing drainage pump 17 Oil pipe 18 Casing pipe 19 Water injection skid 20 Well washing pipeline 21 Gas production pipeline 22 Liquid outlet pipeline H1 Communication hole H2 Well washing hole H3 Balance hole.

Detailed ways

Well-washable coalbed methane drainage equipment, including oil pipe 17, hollow rod 15 and well-washing drainage pump 16, the lower part of hollow rod 15 is inside oil pipe 17, the lower end of hollow rod 15 and oil pipe 17 is connected to well-washing drainage pump 16, and the hollow rod The upper part of 15 communicates with the liquid outlet pipeline 22, and the water injection skid 19 communicates with the annular space of the hollow rod 15 and the tubing 17 through the well flushing pipeline 20.

The well washing drainage pump 16 includes the oil pipe 17 joint 3, the upper end of the oil pipe 17 joint 3 is connected to the oil pipe 17, the lower inner wall of the oil pipe 17 joint 3 is provided with a boss, and the boss is opened with a communication hole H1, and the lower outer wall of the oil pipe 17 joint 3 is connected to the outer cylinder 10 , the lower end of the outer cylinder 10 is connected to the tail joint 13, the inner wall of the lower part of the oil pipe 17 joint 3 is connected to the pump barrel 7, the upper part of the pump barrel 7 is equipped with a plunger 5, the upper end of the plunger 5 is integrally connected to the hollow tie rod 2, and the upper end of the hollow tie rod 2 is provided with a hollow rod 15 joint 1, hollow rod 15 joint 1 is connected to the hollow rod 15, the plunger 5 is a hollow structure, the lower part of the plunger 5 is provided with an upper moving valve 4 and a lower moving valve 6, and the inner part of the pump cylinder 7 is provided with an upper fixed valve 8 and the lower fixed valve 9, the pump cylinder 7 has a well flushing hole H2 at the lower fixed valve 9, the outer wall of the lower part of the pump cylinder 7 is covered with a sliding sleeve 11, and the middle part of the sliding sleeve 11 is provided with a pressure balance hole H3, and the outer wall of the sliding sleeve 11 An annular sealing boss 14 is provided, and the inner wall of the lower part of the outer cylinder 10 is provided with 11 sliding sleeves.

During operation, the upper end of the tubing 17 is sealed and connected to the Christmas tree, the hollow rod 15 is connected to the surface pumping unit, and the gas production pipeline 21 is connected to the annular space between the tubing 17 and the casing 18. The pressure in 7 decreases, the upper fixed valve 8 and the lower fixed valve 9 are opened, and the liquid in the well enters the pump barrel 7 from the upper fixed valve 8; during the downstroke, the plunger 5 goes down, the pressure in the pump barrel 7 rises, and the upper The fixed valve 8 and the lower fixed valve 9 are closed, the upper moving valve 4 and the lower moving valve 6 are opened, and the liquid in the pump barrel 7 is discharged into the hollow rod 2; as the pump continues to pump, the liquid will The contained pulverized coal particles are carried to the ground, and the coalbed gas enters the gas production pipeline 21 from the annular space between the oil pipe 17 and the casing pipe 18 .

During well flushing, the flushing fluid is pressurized by the water injection skid 19, and then passes through the annulus of the oil pipe 17 and the hollow rod 15, the communication hole H1, the pump barrel 7 and the annular space of the outer barrel 10, and under the hydraulic pressure of the flushing fluid, the sliding sleeve 11 Moving down, the sliding sleeve 11 moves down to open the well flushing hole H2 opened on the side wall of the lower fixed valve 9. At this time, the annulus of the pump cylinder 7 and the outer cylinder 10 communicates with the inner hole of the plunger 5, and the well flushing fluid passes through the upper The fixed valve 8, the downstream mobile valve 6, and the upper mobile valve 4 enter the liquid production pipe, thereby realizing the control of the lower fixed valve 9, the upper fixed valve 8, the lower mobile valve 6 and the upper mobile valve 4. Cleaning, the coal powder in the lower fixed valve 9, the upper fixed valve 8, the lower mobile valve 6 and the upper mobile valve 4 is carried to the ground by the cleaning liquid and discharged to the ground water tank.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications to the specific implementation of the invention or equivalent replacement of some technical features; without departing from the spirit of the technical solution of the present invention, should be included in the scope of the technical solution claimed in the present invention.

Claims (4)

1. Well-washable coalbed methane drainage equipment, characterized in that it includes oil pipes, hollow rods and well-washing drainage pumps, the lower part of the hollow rods is inside the oil pipes, and the lower ends of the hollow rods and oil pipes are connected to the well-washing drainage pumps, and the well-washing drainage pumps The pump includes an oil pipe joint, the upper end of the oil pipe joint is connected to the oil pipe, the inner wall of the lower part of the oil pipe joint is provided with a boss, and the boss is opened with a communication hole, the outer wall of the lower part of the oil pipe joint is connected to the outer cylinder, the lower inner wall of the outer cylinder is provided with a sliding sleeve seat, and the lower end of the outer cylinder is connected to the tail joint , the inner wall of the lower part of the oil pipe joint is connected to the pump barrel, the upper part of the pump barrel is installed with a plunger, and the upper end of the plunger is connected to the hollow rod. There is a fixed valve in the middle of the pump barrel. The fixed valve includes an upper fixed valve and a lower fixed valve. The pump barrel has a well-washing hole at the fixed valve, and the outer wall of the lower part of the pump cylinder is covered with a sliding sleeve. , There is a pressure balance hole in the middle of the sliding sleeve, the outer wall of the sliding sleeve is provided with an annular sealing boss, the lower part of the sliding sleeve is connected to the spring, and the lower end of the spring is connected to the tail joint. 2. The well-washable coalbed methane drainage equipment according to claim 1, characterized in that the upper end of the plunger is integrally connected with a hollow tie rod, the upper end of the hollow tie rod is provided with a hollow rod joint, and the hollow rod joint is connected with the hollow rod. 3. The well-washable coalbed methane extraction equipment according to claim 1, characterized in that, the well-washing hole is located at the lower fixed valve. 4. The well-washable coalbed methane drainage equipment according to claim 1, characterized in that, the upper part of the hollow rod is connected to the liquid outlet pipeline, and the water injection skid is connected to the annular space of the hollow rod and the oil pipe through the well-washing pipeline.

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