Sand removing and plug removing device for gas recovery well

Abstract

The invention belongs to the technical field of gas production and sand removal, and provides a sand removal and plug removal device for a gas production well, which comprises a control pup joint, a power pup joint and a sand removal shovel assembly which are sequentially connected from top to bottom, the control short section comprises an upper pipe body, the top of the upper pipe body communicates with the upper pipe column, a plurality of gas holes are formed in the side wall of the upper pipe body, a flow channel switching assembly and a control ball are arranged in the upper pipe body, and when the control ball controls the flow channel switching assembly to be in a gas production state, natural gas enters the upper pipe column through the gas holes and the flow channel switching assembly. When the control ball controls the flow channel switching assembly to be in a desanding state, fluid for desanding enters the power short section through the upper pipe column and the flow channel switching assembly; the power short section comprises a lower pipe body, and a fluid power assembly is arranged in the lower pipe body. The desanding shovel assembly is in transmission connection with the bottom of the fluid power assembly, and a jet flow assembly is further arranged in the desanding shovel assembly. The desander can be used for a long time after one-time well descending, and sand can be quickly and efficiently removed without repeatedly lifting and descending a tubular column.

Description

Technical Field

[0001] The invention belongs to the technical field of gas production and sand removal, and in particular relates to a gas production well sand removal and blockage removal device. Background Art

[0002] With the improvement of oil exploration and development in my country, the proportion of low-permeability oil and gas field reserves is increasing year by year. As the difficulty of oil extraction increases, natural gas development is receiving more and more attention.

[0003] Gas wells are the basic unit of gas reservoir development, through which underground natural gas resources are extracted to the surface and then transformed into commodities and benefits. Sand production is one of the problems faced by gas wells. Severe sand production in the formation will affect the normal production of gas wells.

[0004] The current method to solve the problem of sand-producing gas wells is to use swirl sand flushing nozzles to flush sand. Specifically, internal and external swirl sand flushing nozzles are used to flush sand through continuous pipe operations. When encountering a compacted sand bridge, the sand flushing encounters more resistance. The swirl sand flushing nozzle drilling and grinding process requires a power device. At this time, a high-speed, low-torque continuous tubing motor is needed to drive it. However, the cost of high-speed, low-torque continuous tubing motors is high, and conventional sand removal tools are inefficient. Therefore, for the blockage of compacted sand at the bottom of the well, conventional sand removal tools are difficult to remove and have a low success rate. There are problems such as long time and high cost for lifting and lowering the pipe string, incomplete sand removal at the bottom of the well, and low work efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a gas well desanding and unblocking device to solve the above problems, so as to achieve long-term use after one-time downhole operation and achieve the purpose of fast and efficient sand removal without repeatedly pulling up and down the pipe column.

[0006] To achieve the above object, the present invention provides the following solution: a device for removing sand and plugging in a gas well, comprising:

[0007] A control nipple, a power nipple and a sand removal shovel assembly connected in sequence from top to bottom;

[0008] The control nipple comprises an upper tube body, the top of the upper tube body is connected to the upper pipe column, a plurality of air holes are opened on the side wall of the upper tube body, a flow channel switching assembly and a control ball are arranged in the upper tube body, when the control ball controls the flow channel switching assembly to be in a gas production state, natural gas enters the upper pipe column through the plurality of air holes and the flow channel switching assembly, and when the control ball controls the flow channel switching assembly to be in a sand removal state, a sand removal fluid enters the power nipple through the upper pipe column and the flow channel switching assembly;

[0009] The power sub comprises a lower tube body, the lower tube body is connected with the upper tube body, a fluid power component is arranged in the lower tube body, and the fluid power component rotates under the impact of the sand removal fluid;

[0010] The sand removal shovel assembly is drivingly connected to the bottom of the fluid power assembly, and a jet assembly is also arranged in the sand removal shovel assembly.

[0011] Preferably, the flow channel switching assembly includes a sealing ring, a ball seat and a spring which are arranged in sequence from top to bottom in the upper tube body, the sealing ring is fixedly connected to the inner wall of the upper tube body, the ball seat is slidably connected between the inner walls of the upper tube body, the bottom of the spring is fixedly connected to the upper tube body, the top of the spring abuts against the bottom of the ball seat, a central hole is opened in the ball seat along the axial direction of the upper tube body, a plurality of radial holes are opened in the ball seat along the radial direction of the upper tube body, and a plurality of the radial holes are connected to the central hole.

[0012] Preferably, the control ball is dropped onto the ball seat through the upper pipe column. When there is no control ball above the ball seat, it is in a gas extraction state. At this time, several of the air holes, several of the radial channels, the central channel and the upper pipe column are connected. After the control ball is dropped onto the ball seat, it is in a sand removal state. At this time, several of the air holes are disconnected from several of the radial channels, and the fluid for sand removal enters the lower tube body through the vertical side channels.

[0013] Preferably, the control ball is made of a soluble material.

[0014] Preferably, the fluid power component includes a rotor rotatably connected to the lower tube body, the outer wall of the rotor is in contact with the inner wall of the lower tube body, the top and bottom of the rotor are respectively provided with hollow pipes, and the outer wall of the rotor is provided with a spiral groove, and both ends of the spiral groove are respectively connected to two groups of the hollow pipes.

[0015] Preferably, the sand removal shovel assembly includes a joint rotatably connected to the bottom of the rotor, and a cutter head is provided at the bottom of the joint.

[0016] Preferably, the jet assembly includes a fluid channel opened in the joint, the fluid channel is connected to the hollow pipe located at the bottom of the rotor, and a plurality of water holes are opened on the side wall of the cutter head, and the plurality of water holes are connected to the fluid channel.

[0017] Preferably, the cutter head comprises a body fixedly connected to the bottom of the joint, the bottom of the body is provided with top teeth, and the two sides of the body are symmetrically provided with a plurality of side teeth, and the plurality of side teeth are used to stir the loose sand at the bottom of the well.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] 1. The present invention realizes the free switching between the two modes of sand removal and gas production at the bottom of the well by setting the control ball and the flow channel switching assembly, which can effectively reduce the number of operations of pulling in and out the pipe string, reduce the labor intensity and operation risk. At the same time, the sand removal and unblocking device of the present invention can also be placed at the bottom of the sand production well for a long time and flush the sand regularly.

[0020] 2. The present invention provides a fluid power component so that the sand removal fluid can drive the sand removal shovel component to rotate, stir the loose sand at the bottom of the well, and improve the sand removal effect.

[0021] 3. The present invention can save labor and time costs, improve the production efficiency of gas wells, and conform to the concept of green environmental protection. It is suitable for gas wells with different well inclinations and has broad prospects for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the sand removal and plugging removal device of the present invention;

[0024] Figure 2 It is a cross-sectional schematic diagram of the control pup joint of the present invention;

[0025] Figure 3 It is a cross-sectional schematic diagram of the power sub of the present invention;

[0026] Figure 4 Three views of the sand removal shovel assembly of the present invention;

[0027] Figure 5 It is a cross-sectional schematic diagram of the ball seat of the present invention;

[0028] Among them, 1. control ball; 2. control short section; 3. power short section; 4. sand shovel assembly; 5. upper tube body; 6. sealing ring; 7. first limit ring; 8. ball seat; 9. spring; 10. spring seat; 11. central channel; 12. radial channel; 13. lower tube body; 14. rotor; 15. bearing; 16. second limit ring; 17. reducer; 18. hollow pipe; 19. spiral groove; 20. joint; 21. side teeth; 22. water eyes; 23. top teeth; 24. fluid channel; 25. air hole; 26. cutter head; 27. vertical side channel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1-Figure 5 The present invention provides a sand removal and plugging removal device for a gas production well, comprising:

[0032] A control short section 2, a power short section 3 and a sand removal shovel assembly 4 are connected in sequence from top to bottom;

[0033] The control nipple 2 comprises an upper pipe body 5, the top of which is connected to the upper pipe column, a plurality of air holes 25 are provided on the side wall of the upper pipe body 5, a flow channel switching assembly and a control ball 1 are arranged in the upper pipe body 5, when the control ball 1 controls the flow channel switching assembly to be in a gas production state, the natural gas enters the upper pipe column through the plurality of air holes 25 and the flow channel switching assembly, and when the control ball 1 controls the flow channel switching assembly to be in a sand removal state, the sand removal fluid enters the power nipple 3 through the upper pipe column and the flow channel switching assembly;

[0034] The power sub 3 includes a lower pipe body 13, which is connected to the upper pipe body 5. A fluid power component is arranged in the lower pipe body 13, and the fluid power component rotates under the impact of the sand removal fluid.

[0035] The sand removal shovel assembly 4 is transmission-connected to the bottom of the fluid power assembly, and a jet assembly is also provided in the sand removal shovel assembly 4 .

[0036] The main function of the upper pipe body 5 is to connect the upper pipe column and the lower pipe body 13; when the control ball 1 controls the flow channel switching assembly to be in the sand removal state, high-pressure fluid is injected from the upper pipe column. When the high-pressure fluid passes through the fluid power assembly, it drives the fluid power assembly to rotate, and the fluid power assembly drives the sand removal shovel assembly 4 to rotate, stirring the sand at the bottom of the well. At the same time, the high-pressure fluid flushes the bottom of the well through the jet assembly. The high-pressure fluid finally moves the sand to the ground through the annular space between the gas production wellbore and the upper pipe column to achieve the sand removal effect; after the sand removal is completed, the control ball dissolves, and the flow channel switching assembly is in the gas production state. At this time, a number of air holes 25 are connected to the upper pipe column through the flow channel switching assembly to collect natural gas to the ground. On the whole, the sand removal and unblocking device of the present invention can realize the free switching of the two working modes of bottom well sand removal and gas production. It can be placed at the bottom of the sand production well for a long time, and sand can be flushed regularly, which effectively reduces labor intensity and operation risks and improves the production efficiency of gas wells.

[0037] A further optimized solution is that the flow channel switching assembly includes a sealing ring 6, a ball seat 8 and a spring 9 which are sequentially arranged in the upper tube body 5 from top to bottom, the sealing ring 6 is fixedly connected to the inner wall of the upper tube body 5, the ball seat 8 is slidably connected between the inner walls of the upper tube body 5, the bottom of the spring 9 is fixedly connected in the upper tube body 5, the top of the spring 9 abuts against the bottom of the ball seat 8, a central channel 11 is opened in the ball seat 8 along the axial direction of the upper tube body 5, and a plurality of radial channels 12 are opened in the ball seat 8 along the radial direction of the upper tube body 5, and the plurality of radial channels 12 are connected to the central channel 11.

[0038] According to a further optimized solution, three groups of first limiting rings 7 are clamped in sequence from top to bottom between the inner walls of the upper tube body 5, the sealing ring 6 is clamped between the two adjacent groups of first limiting rings 7 located at the top, a spring seat 10 is fixedly connected to the first limiting ring 7 located at the bottom, and the bottom of the spring 9 is fixedly connected to the spring seat 10.

[0039] To further optimize the solution, the flow channel switching assembly also includes a control ball 1, which is dropped onto the ball seat 8 through the upper pipe column. When there is no control ball 1 above the ball seat 8, it is in a gas extraction state. At this time, a plurality of air holes 25, a plurality of radial channels 12, a central channel 11 and the upper pipe column are connected. After the control ball 1 is dropped onto the ball seat 8, it is in a sand removal state. At this time, a plurality of air holes 25 are disconnected from a plurality of radial channels 12, and the sand removal fluid enters the lower tube body 13 through the vertical side channels 27.

[0040] Further optimization scheme, such as Figure 5 As shown, a plurality of vertical side channels 27 are opened on the ball seat 8 along the axial direction of the upper tube body 5 , and the plurality of vertical side channels 27 are distributed on the edge of the ball seat 8 and penetrate the ball seat 8 .

[0041] According to a further optimized solution, the control ball 1 is made of a soluble material.

[0042] like Figure 2 As shown, when sand removal is required, the staff drops a control ball 1 from the upper pipe column. After the control ball 1 contacts the ball seat 8, it presses down the ball seat 8 and compresses the spring 9, so that the radial channel 12 and the air hole 25 are disconnected, and the natural gas in the gas well cannot enter the upper pipe column through the air hole 25. At the same time, the sand removal fluid is injected through the upper pipe column, and while further pushing the ball seat 8 downward, the fluid flows through the sealing ring 6, the vertical side channel 27 and the first limit ring 7 in sequence and enters the lower pipe body 13, interacting with the fluid power component, driving the sand removal shovel component 4 to rotate, and performing the sand removal operation.

[0043] Since the control ball 1 is made of soluble material, after the sand removal is completed, as the control ball 1 dissolves in the fluid, the ball seat 8 is reset under the elastic force of the spring 9, so that the radial channel 12 is connected with the air hole 25 again, and the injection of fluid into the upper pipe string is stopped. Natural gas can enter the upper pipe string through the air hole 25, the radial channel 12, and the central channel 11, thereby extracting the natural gas to the ground.

[0044] A further optimized solution is that the fluid power component includes a rotor 14 rotatably connected to the lower tube body 13, the outer wall of the rotor 14 is in contact with the inner wall of the lower tube body 13, hollow pipes 18 are respectively provided at the top and bottom of the rotor, and a spiral groove 19 is provided on the outer wall of the rotor 14, and both ends of the spiral groove 19 are respectively connected to two groups of hollow pipes 18.

[0045] In a further optimized solution, two sets of bearings 15 are fixedly connected in the lower tube 13, and the two ends of the rotor 14 are fixedly fitted with the two sets of bearings 15. The main function of the bearings 15 is to reduce the rotation resistance of the rotor 14. A second limiting ring 16 is also provided in the lower tube 13, and the second limiting ring 16 is used to limit the bearing 15, thereby preventing the rotor 14 from moving in the axial direction.

[0046] like Figure 3 As shown, the sand removal fluid flows into the spiral groove between the outside of the rotor 14 and the lower tube body 13 through the upper hollow pipe 18, and the flow energy of the liquid is converted into rotational force, driving the rotor 14 to rotate, and the rotational force is transmitted to the lower sand removal shovel assembly 4 through the rotor 14.

[0047] According to a further optimized solution, the sand removal shovel assembly 4 includes a joint 20 drivingly connected to the bottom of the rotor 14 , and a cutter head 26 is provided at the bottom of the joint 20 .

[0048] According to a further optimized solution, the bottom of the rotor 14 protrudes from the bottom of the lower tube body 13 and is fixedly connected with a reducer 17 . The connector 20 is fixedly connected in the reducer 17 , and the reducer 17 is connected to the hollow pipe 18 .

[0049] As a further optimization scheme, the jet assembly includes a fluid channel 24 opened in the joint 20, the fluid channel 24 is connected to the hollow pipe 18 located at the bottom of the rotor 14, and a plurality of water holes 22 are opened on the side wall of the cutter head 26, and the water holes 22 are connected to the fluid channel 24.

[0050] like Figure 4 As shown, the fluid for sand removal is ejected from a plurality of water holes 22 through a fluid channel 24 to impact the loose sand at the bottom of the well, thus facilitating the sand removal.

[0051] According to a further optimization scheme, the cutter head 26 includes a body fixedly connected to the bottom of the joint 20, a top tooth 23 is provided at the bottom of the body, and a plurality of side teeth 21 are symmetrically provided on both sides of the body, and the plurality of side teeth 21 are used to stir the loose sand at the bottom of the well.

[0052] like Figure 4 As shown, two groups of side teeth 21 are symmetrically arranged on the body, and the cutter head 26 is generally S-shaped when viewed from above. The side teeth 21 can enhance the stirring ability of the loose sand at the bottom of the well and improve the sand removal efficiency.

[0053] The working process of this embodiment is as follows: when sand removal is required, the staff drops a control ball 1 from the upper pipe column, and after the control ball 1 contacts the ball seat 8, it presses down the ball seat 8 and compresses the spring 9, so that the radial channel 12 is disconnected from the air hole 25. At the same time, the sand removal fluid is injected through the upper pipe column, and while further pushing the ball seat 8 downward, the fluid flows through the sealing ring 6, the vertical side channel 27 and the first limit ring 7 in sequence into the lower pipe body 13, and flows in the spiral groove 19 through the hollow pipe 18 in the lower pipe body 13, converting the flow energy of the sand removal fluid into the rotation force of the rotor 14, thereby driving the cutter head 26 to rotate, and stirring the sand at the bottom of the well through the top teeth 23 and the side teeth 21. At the same time, after the fluid flows through the spiral groove 19, it is ejected from the plurality of water holes 22 to the bottom of the well through the fluid channel 24, and the impact of water is used to assist in cleaning the loose sand at the bottom of the well. Afterwards, the fluid ejected from the water eye 22 moves upward through the annular space formed between the upper pipe string and the well wall, circulating the sand to the ground, achieving the effect of sand removal and unblocking.

[0054] Since the control ball 1 is made of soluble material, after the sand removal is completed, as the control ball 1 dissolves in the fluid, the ball seat 8 is reset under the elastic force of the spring 9, so that the radial channel 12 is connected with the air hole 25 again, and the injection of fluid into the upper pipe string is stopped. Natural gas can enter the upper pipe string through the air hole 25, the radial channel 12, and the central channel 11, thereby extracting the natural gas to the ground.

[0055] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A gas well sand removal and plugging removal device, characterized in that: include: A control short section (2), a power short section (3) and a sand removal shovel assembly (4) are sequentially connected from top to bottom; The control nipple (2) comprises an upper tube body (5), the top of the upper tube body (5) is connected to the upper pipe string, a plurality of air holes (25) are provided on the side wall of the upper tube body (5), a flow channel switching assembly and a control ball (1) are provided in the upper tube body (5), and when the control ball (1) controls the flow channel switching assembly to be in a gas production state, natural gas enters the upper pipe string through the plurality of air holes (25) and the flow channel switching assembly, and when the control ball (1) controls the flow channel switching assembly to be in a desanding state, a desanding fluid enters the power nipple (3) through the upper pipe string and the flow channel switching assembly; The power sub (3) comprises a lower tube body (13), the lower tube body (13) is communicated with the upper tube body (5), a fluid power component is arranged in the lower tube body (13), and the fluid power component rotates under the impact of the sand removal fluid; The sand removal shovel assembly (4) is transmission-connected to the bottom of the fluid power assembly, and a jet assembly is also provided in the sand removal shovel assembly (4).

2. The device for removing sand and plugging in a gas well according to claim 1, characterized in that: The flow channel switching assembly comprises a sealing ring (6), a ball seat (8) and a spring (9) which are sequentially arranged in the upper tube body (5) from top to bottom, wherein the sealing ring (6) is fixedly connected to the inner wall of the upper tube body (5), the ball seat (8) is slidably connected between the inner walls of the upper tube body (5), the bottom of the spring (9) is fixedly connected to the upper tube body (5), the top of the spring (9) abuts against the bottom of the ball seat (8), a central channel (11) is provided in the ball seat (8) along the axial direction of the upper tube body (5), and a plurality of radial channels (12) are provided in the ball seat (8) along the radial direction of the upper tube body (5), and the plurality of radial channels (12) are communicated with the central channel (11).

3. The device for removing sand and plugging in a gas well according to claim 2, characterized in that: The control ball (1) is dropped onto the ball seat (8) through the upper pipe column. When there is no control ball (1) above the ball seat (8), it is in a gas extraction state. At this time, the plurality of air holes (25), the plurality of radial channels (12), the central channel (11) and the upper pipe column are connected. After the control ball (1) is dropped onto the ball seat (8), it is in a sand removal state. At this time, the plurality of air holes (25) are disconnected from the plurality of radial channels (12), and the sand removal fluid enters the lower pipe body (13) through the vertical side channel (27).

4. The device for removing sand and plugging in a gas well according to claim 3, characterized in that: The control ball (1) is made of soluble material.

5. The device for removing sand and unblocking gas wells according to claim 1, characterized in that: The fluid power assembly comprises a rotor (14) rotatably connected to the lower tube (13), the outer wall of the rotor (14) being in contact with the inner wall of the lower tube (13), the top and bottom of the rotor being respectively provided with hollow pipes (18), the outer wall of the rotor (14) being provided with a spiral groove (19), and the two ends of the spiral groove (19) being respectively connected to the two groups of the hollow pipes (18).

6. The device for removing sand and unblocking gas wells according to claim 5, characterized in that: The sand removal shovel assembly (4) comprises a joint (20) which is transmission-connected to the bottom of the rotor (14); a cutter head (26) is provided at the bottom of the joint (20).

7. The device for removing sand and unblocking gas wells according to claim 6, characterized in that: The jet assembly includes a fluid channel (24) opened in the joint (20), the fluid channel (24) is connected to the hollow pipe (18) located at the bottom of the rotor (14), and a plurality of water holes (22) are opened on the side wall of the cutter head (26), and the plurality of water holes (22) are connected to the fluid channel (24).

8. The device for removing sand and plugging in a gas well according to claim 6, characterized in that: The cutter head (26) comprises a body fixedly connected to the bottom of the joint (20), the bottom of the body is provided with a top tooth (23), and the two sides of the body are symmetrically provided with a plurality of side teeth (21), and the plurality of side teeth (21) are used to stir the loose sand at the bottom of the well.

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