Sand bailing tool for coal bed gas horizontal well

Abstract

The utility model discloses a coalbed methane horizontal well sand bailing tool, which relates to the technical field of coalbed methane exploitation operation and comprises an upper pump cylinder and a lower pump cylinder which are arranged in a matched mode, the top of the lower pump cylinder is communicated and connected with a conveying mechanism, and an inner connecting seat and an outer connecting pipe are arranged at the connecting position of the conveying mechanism and the lower pump cylinder in a matched mode. A piston rod, a sealing piston and an intercepting base which are fixedly connected in sequence from top to bottom are embedded in the upper pump cylinder, and a discharging hole and an intercepting net are arranged at the connecting position of the upper pump cylinder and the lower pump cylinder. The effect of sucking sand and storing is achieved through the upper pump cylinder and the lower pump cylinder, the effect of intercepting and collecting pulverized coal entering the lower pump cylinder is achieved through the sealing piston and the intercepting base, the effect of filtering and intercepting the pulverized coal sucked into the lower pump cylinder is achieved through the intercepting net, and the effect of discharging liquid in the pulverized coal is achieved through the discharging hole.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane extraction operations, and in particular to a sand-removing tool for horizontal coalbed methane wells. Background Technology

[0002] Coalbed methane is a gaseous resource associated with and coexisting with coal. It refers to hydrocarbon gases stored in coal seams, with methane as the main component. It is an unconventional natural gas. In the process of coalbed methane extraction, it is necessary to carry out sand and coal powder removal operations in horizontal wells.

[0003] Horizontal wells are the main type of well for coalbed methane development. However, the quartz sand and coal dust returned during coalbed methane drainage cause great difficulties in drainage. In traditional technology, sand and coal dust are usually removed by flushing sand and coal dust. This has a huge impact on the formation disturbance of horizontal wells. The injection of high-pressure water causes great damage to the passages near the wellbore, making it difficult for the production of horizontal wells to return to the initial level. At this time, when using sand-removing tools, a large amount of water is easily drawn in during the sand-removing process, resulting in less sand and coal dust removed and affecting efficiency.

[0004] Therefore, this utility model proposes a sand-removing tool for horizontal coalbed methane wells. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a sand-removing tool for horizontal coalbed methane wells, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a sand-removing tool for horizontal coalbed methane wells, comprising an upper pump cylinder and a lower pump cylinder, the top of the lower pump cylinder being connected to a conveying mechanism, the connection position between the conveying mechanism and the lower pump cylinder being provided with an inner connector and an outer connector, the interior of the upper pump cylinder being embedded with a piston rod, a sealing piston and an intercepting seat being fixedly connected from top to bottom, the connection position between the upper pump cylinder and the lower pump cylinder being provided with a discharge hole and an intercepting net, the interior and exterior ends of the lower pump cylinder being fixedly connected with a guide seat and a sand inlet pipe head respectively, and the top of the guide seat being movably connected with a one-way valve;

[0007] The outer end of the sand inlet pipe head is fixedly connected to a sand inlet sleeve. The inner side of the sand inlet pipe head is connected in sequence from the inside to the outside with a support ring, a spring and a sand inlet plug. The sand inlet plug is also located inside the sand inlet sleeve.

[0008] As a further technical solution of this utility model, the upper pump cylinder and the lower pump cylinder are connected in an "L" shape, the conveying mechanism is vertically connected to the lower pump cylinder through an outer pipe, the outer pipe is also longitudinally connected to the back of the lower pump cylinder, and the inner connection seat is a trapezoidal seat fixedly connected to the inside of the lower pump cylinder.

[0009] As a further technical solution of this utility model, the sealing piston is set as a rubber piston, the intercepting seat is set in a trapezoidal outward expansion, and the discharge hole is opened on both sides of the bottom of the upper pump cylinder.

[0010] As a further technical solution of this utility model, the interception net is arranged in a fan shape and is located below the discharge hole.

[0011] As a further technical solution of this utility model, the two ends of the support ring are provided with honeycomb-shaped through holes, and 2-4 sets of springs are provided. The surface of the support ring is horizontally fixed and connected at the center position. The inner end of the sand inlet plug is provided with a trapezoidal base, and the outer end is provided with a spherical plug.

[0012] As a further technical solution of this utility model, the sand inlet sleeve is set in a trapezoidal sleeve, and its inner side and the trapezoidal base at the inner end of the sand inlet plug are set at the same horizontal inclination.

[0013] As a further technical solution of this utility model, the guide seat is raised as a whole, with the end facing the sand inlet pipe head being raised in an arc shape, while the end facing the inner connector is inclined downward.

[0014] As a further technical solution of this utility model, a valve control mechanism is provided inside the guide seat, and a one-way valve is provided on the top of the guide seat, with a sealing layer provided on its top.

[0015] This utility model provides a sand-removing tool for horizontal coalbed methane wells, which has the following advantages compared with the prior art:

[0016] Beneficial effects:

[0017] 1. This design is a sand-removing tool for horizontal coalbed methane wells. It achieves the effect of sand suction and storage through upper and lower pump cylinders, intercepts and collects coal powder entering the lower pump cylinder through a sealing piston and interceptor seat, filters and intercepts coal powder sucked into the lower pump cylinder through an interceptor net, and discharges liquid from the coal powder through a discharge hole.

[0018] 2. This design is a sand-removing tool for horizontal coalbed methane wells. By using a support ring and a spring, it is possible to connect and fix the sand inlet plug as a whole in the sand inlet casing. The sand inlet plug is used to control the flow rate in and out of the sand inlet casing.

[0019] 3. This design is a sand-removing tool for horizontal coalbed methane wells. It uses a guide seat to guide the liquid entering the lower pump barrel and a one-way valve to control the opening and closing of the lower pump barrel. Attached Figure Description

[0020] Figure 1 A front view of the structure of a sand-removing tool for a horizontal coalbed methane well;

[0021] Figure 2 This is an enlarged view of the structure at point A in the diagram, which is a sand-removing tool for horizontal coalbed methane wells.

[0022] Figure 3 This is a front view of the internal structure connection of the sand inlet pipe head of a sand-dredging tool for a coalbed methane horizontal well.

[0023] In the diagram: 1. Upper pump cylinder; 2. Lower pump cylinder; 3. Conveying mechanism; 4. Piston rod; 5. Sealing piston; 6. Interception seat; 7. Discharge hole; 8. Interception net; 9. Inner connector; 10. Outer connector; 11. Sand inlet pipe head; 12. Guide seat; 13. One-way valve; 14. Support ring; 15. Spring; 16. Sand inlet plug; 17. Sand inlet sleeve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-3 This utility model provides a technical solution for a sand-removing tool in a horizontal coalbed methane well: it includes an upper pump cylinder 1 and a lower pump cylinder 2, which are equipped with matching upper pump cylinder 1 and lower pump cylinder 2. The top of the lower pump cylinder 2 is connected to a conveying mechanism 3. The connection position between the conveying mechanism 3 and the lower pump cylinder 2 is equipped with an inner connector 9 and an outer connector 10. The upper pump cylinder 1 is embedded with a piston rod 4, a sealing piston 5 and an interceptor seat 6, which are fixedly connected from top to bottom. The connection position between the upper pump cylinder 1 and the lower pump cylinder 2 is provided with a discharge hole 7 and an interceptor net 8. The lower pump cylinder 2 is fixedly connected to a guide seat 12 and a sand inlet pipe head 11 at its inner and outer ends, respectively. The top of the guide seat 12 is movably connected to a one-way valve 13. The outer end of the sand inlet pipe head 11 is fixedly connected to a sand inlet sleeve 17. The inner side of the sand inlet pipe head 11 is connected from the inside to the outside with a support ring 14, a spring 15 and a sand inlet plug 16, which is located inside the sand inlet sleeve 17.

[0026] like Figure 1As shown, the upper pump cylinder 1 and the lower pump cylinder 2 are connected in an "L" shape. The conveying mechanism 3 is vertically connected to the lower pump cylinder 2 through the outer pipe 10. The outer pipe 10 is also longitudinally connected to the back of the lower pump cylinder 2. The inner connecting seat 9 is a trapezoidal seat fixedly connected to the inside of the lower pump cylinder 2. The sealing piston 5 is a rubber piston. The intercepting seat 6 is trapezoidally expanded outward. The discharge hole 7 is opened on both sides of the bottom of the upper pump cylinder 1. The intercepting net 8 is fan-shaped and expanded outward, located below the discharge hole 7. The upper pump cylinder 1 and the lower pump cylinder 2 achieve the effect of sand suction and storage. The sealing piston 5 and the intercepting seat 6 achieve the effect of intercepting and collecting coal powder entering the lower pump cylinder 2. The intercepting net 8 achieves the effect of filtering and intercepting coal powder sucked into the lower pump cylinder 2. The discharge hole 7 achieves the effect of discharging liquid in the coal powder.

[0027] The piston rod 4 drives the sealing piston 5 to move up and down along the upper pump cylinder 1, creating a negative pressure in the upper pump cylinder 1 and the lower pump cylinder 2. This draws the liquid containing coal powder into the pump cylinder, where the intercepting net 8 filters it, causing the coal powder in the liquid to concentrate at the inner seat 9, facilitating the subsequent conveying mechanism 3 to transport the coal powder. As the sealing piston 5 rises, the water source is discharged outward when it passes through the discharge hole 7, achieving a highly efficient sand dredging effect.

[0028] like Figure 3 As shown, the two ends of the support ring 14 are provided with honeycomb-shaped through holes. 2-4 sets of springs 15 are provided, which are horizontally fixed to the center of the surface of the support ring 14. The inner end of the sand inlet plug 16 is provided with a trapezoidal base, and the outer end is provided with a spherical plug. The sand inlet sleeve 17 is provided with a trapezoidal sleeve, and its inner side is inclined at the same level as the trapezoidal base of the inner end of the sand inlet plug 16. The support ring 14 and the springs 15 are used to facilitate the connection and fixation of the sand inlet plug 16 in the sand inlet sleeve 17. The sand inlet plug 16 is used to control the flow rate of the sand inlet sleeve 17.

[0029] When the pump cylinder is under negative pressure, the spring 15 is compressed, causing the sand inlet plug 16 to retract into the sand inlet sleeve 17, and the liquid containing coal powder enters the pump cylinder and is collected in the lower pump cylinder 2 through the support ring 14.

[0030] like Figure 2-3 As shown, the guide seat 12 is raised as a whole, with one end facing the sand inlet pipe head 11 in an arc shape and the other end facing the inner connector 9 inclined downward. A valve control mechanism is provided inside the guide seat 12. The one-way valve 13 protrudes upward from the top of the guide seat 12 and has a sealing layer at its top. The guide seat 12 guides the liquid entering the lower pump cylinder 2, and the one-way valve 13 controls the opening and closing of the lower pump cylinder 2.

[0031] After the liquid containing coal powder enters the lower pump cylinder 2, it is guided along the raised guide seat 12. Due to its own weight, the coal powder flows along the surface of the raised guide seat 12. When the flow guide seat 12 is tilted at one end, a portion of it is concentrated at the inner seat 9, while the liquid containing some coal powder continues to flow towards the interception net 8 for interception and filtration. This can efficiently separate the coal powder and the liquid for subsequent discharge.

[0032] The conveying mechanism 3 in this device is limited to using a screw conveyor mechanism;

[0033] The working principle of this utility model is as follows: When this device is in use, the liquid containing sand and coal powder enters the lower pump cylinder 2. After being guided and separated by the guide seat 12, the coal powder is concentrated at the inner connection seat 9 and transported by the conveying mechanism 3. The liquid containing some coal powder is intercepted by the interception net 8 and discharged outward from the discharge hole 7, ensuring the efficiency of sand removal while preventing liquid residue from entering the pump cylinder.

[0034] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A sand fishing tool for a coal seam gas horizontal well, characterised in that: It includes an upper pump cylinder (1) and a lower pump cylinder (2) with matching configurations. The top of the lower pump cylinder (2) is connected to a conveying mechanism (3). The connection position between the conveying mechanism (3) and the lower pump cylinder (2) is equipped with an inner connector (9) and an outer connector (10). The upper pump cylinder (1) is embedded with a piston rod (4), a sealing piston (5) and an interceptor seat (6) that are fixedly connected from top to bottom. The connection position between the upper pump cylinder (1) and the lower pump cylinder (2) is equipped with a discharge hole (7) and an interceptor net (8). The inner and outer ends of the lower pump cylinder (2) are respectively fixedly connected with a guide seat (12) and a sand inlet pipe head (11). The top of the guide seat (12) is movably connected with a one-way valve (13). The outer end of the sand inlet pipe head (11) is fixedly connected to the sand inlet sleeve (17). The inner side of the sand inlet pipe head (11) is connected to the support ring (14), spring (15) and sand inlet plug (16) from the inside to the outside. The sand inlet plug (16) is located inside the sand inlet sleeve (17).

2. The sand bailer tool for coal bed methane horizontal wells of claim 1, wherein: The upper pump cylinder (1) and the lower pump cylinder (2) are connected in an "L" shape. The conveying mechanism (3) is vertically connected to the lower pump cylinder (2) through the outer pipe (10). The outer pipe (10) is also longitudinally connected to the back of the lower pump cylinder (2). The inner connector (9) is a trapezoidal seat fixedly connected to the inside of the lower pump cylinder (2).

3. The sand bailer tool for coal bed methane horizontal wells of claim 1, wherein: The sealing piston (5) is a rubber piston, the intercepting seat (6) is trapezoidally expanded, and the discharge hole (7) is opened on both sides of the bottom of the upper pump cylinder (1).

4. The sand bailer tool for coal bed methane horizontal wells of claim 1, wherein: The interception net (8) is arranged in a fan shape and is located below the discharge hole (7).

5. The sand bailer tool for coal bed methane horizontal wells of claim 1, wherein: The two ends of the support ring (14) are provided with honeycomb-shaped through holes. There are 2-4 sets of springs (15) which are horizontally fixed to the center of the surface of the support ring (14). The inner end of the sand inlet plug (16) is provided with a trapezoidal base and the outer end is provided with a spherical plug.

6. The sand bailer tool for coal bed methane horizontal wells of claim 1, wherein: The sand inlet sleeve (17) is set in a trapezoidal sleeve, and its inner side and the trapezoidal base at the inner end of the sand inlet plug (16) are set at the same horizontal inclination.

7. The sand bailer tool for coal bed methane horizontal wells of claim 1, wherein: The guide seat (12) is raised as a whole, with one end facing the sand inlet pipe head (11) being raised in an arc shape, while the other end facing the inner connector (9) is inclined downward.

8. The sand bailer tool for coal bed methane horizontal wells of claim 1, wherein: The guide seat (12) is equipped with a valve control mechanism inside. A one-way valve (13) protrudes upward from the top of the guide seat (12) and has a sealing layer at its top.

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