A drainage gas recovery process string structure and system with sand carrying function

Abstract

The application relates to the technical field of gas production systems, and discloses a drainage gas production process pipe column structure with a sand carrying function and a system, which comprises a stator and a rotor. The stator is connected with centralizers at both ends. The rotor is located in the stator and rotationally connected with the two centralizers at both ends. The clearance between the rotor and the stator forms a spiral flow channel for conveying medium. A sand blocking piece is arranged on the rotor. During the lifting of large-diameter sand particles from the well bottom to the well mouth, the sand blocking piece is used to block the large-diameter sand particles. A flow channel is arranged on the sand blocking piece. The flow channel prevents sand and gravel from depositing and realizes the flow of gas. The application can effectively prevent sand sticking, avoid the damage of the pipe column structure, effectively prevent the sliding of large-diameter sand particles, assist in sand carrying of fluid, realize good gas flow, improve the gas production capacity, and ensure the efficiency of gas production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas production systems, in particular to a drainage gas production process pipe column structure with sand carrying function and system. BACKGROUND

[0002] In the process of natural gas production, the decrease of formation pressure will cause the formation water to gradually advance to the well bottom, thereby entering the wellbore. When the gas production is less than the minimum liquid carrying flow rate of gas, the formation water begins to accumulate in the wellbore to form liquid loading. These liquid loadings not only reduce the gas production efficiency of the gas well, but also cause the bottom water flooding of the gas well, resulting in water lock and production stoppage of the gas well. In addition, the bottom of the well may also form sand plugs due to the collapse of the well wall or the accumulation of fracturing proppants (such as quartz sand, ceramic particles, etc.), further hindering the flow of gas. The double effects of liquid loading and sand plugs make it difficult to fully release the productivity of the gas well. In view of this, it is urgent to develop a drainage gas production process pipe column structure with sand carrying function to effectively solve the above problems and ensure stable production of natural gas.

[0003] The existing patent application file for the utility model patent CN210289730U discloses a mechanical oil production mechanism and system with double helix structure, which comprises a stator, a rotor and the like. The rotor is provided with helical blades on the outer periphery, the inner wall of the stator is provided with a helical channel, the helical blades are adapted to the helical channel, and the gap between the two forms a chamber. Under the driving of the driving mechanism, the rotor moves in the stator without contacting the stator, and the chamber containing sand and heavy oil is lifted.

[0004] The existing technology uses a driving mechanism to drive the rotor to rotate in the stator, which drives the sand-containing liquid in the chamber to flow upward along the helical channel, thereby achieving the lifting of the liquid. For this application scenario of sand-containing heavy oil production, the technology can effectively carry sand and avoid sand sticking. However, for the gas production scene that requires both sand carrying and drainage, the sand carrying and drainage effect of the technology is not ideal due to the smaller viscosity and faster flow rate of gas than heavy oil. At the same time, the helical structure also hinders the flow of gas to some extent.

[0005] Therefore, there is an urgent need for a drainage gas production process pipe column structure with sand carrying function to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a drainage gas production process pipe column structure with sand carrying function to solve the problems existing in the prior art.

[0007] To achieve the above purpose, the present application provides the following scheme: the present application provides a drainage gas production process pipe column structure with sand carrying function, which comprises a stator and a rotor,

[0008] The stator is connected with a centralizer, the rotor is located in the stator, and the two ends of the rotor are rotationally connected with the two centralizers respectively, the gap between the rotor and the stator is matched to form a spiral flow channel, and the medium is transported through the spiral flow channel;

[0009] A sand blocking piece is arranged on the rotor, wherein the sand blocking piece is used for blocking the large-diameter sand particles during the lifting of the large-diameter sand particles from the well bottom to the well head;

[0010] A flow channel is arranged on the sand blocking piece, the flow channel prevents the sand particles from depositing and realizes the flow of the gas.

[0011] According to the drainage gas recovery process pipe column structure with the sand carrying function, the stator comprises a stator cylinder, three stator spirals are arranged on the inner side wall of the stator cylinder, the starting points of the three stator spirals are located on the same horizontal plane, and the three stator spirals are staggered.

[0012] According to the drainage gas recovery process pipe column structure with the sand carrying function, the centralizer comprises a centralizer outer cylinder, a centralizer inner cylinder is connected to the centralizer outer cylinder through a plurality of connecting ribs, and one end of the rotor is rotationally connected with the centralizer inner cylinder.

[0013] According to the drainage gas recovery process pipe column structure with the sand carrying function, the rotor comprises a cylindrical core, a rotor spiral is fixedly connected to the outer side wall of the cylindrical core, the sand blocking piece is arranged on the rotor spiral and used for rotating with the rotor spiral, and the two ends of the cylindrical core are fixedly connected with connecting end heads respectively, and the connecting end heads are installed in the centralizer inner cylinder.

[0014] According to the drainage gas recovery process pipe column structure with the sand carrying function, the sand blocking piece comprises a plurality of sand blocking pieces, the plurality of sand blocking pieces are arranged in two rows along the axial direction and located on the two sides of the cylindrical core respectively, and the sand blocking pieces are fixedly connected to the spiral blades of the rotor spiral, the top sides of the sand blocking pieces are provided with a sand blocking piece male face and a sand blocking piece female face respectively, the sand blocking piece male face is a sand facing surface, the sand blocking piece male face is a bevel structure, the sand blocking piece female face is an arc structure, and the flow channel is located on the sand blocking piece female face.

[0015] According to the drainage gas recovery process pipe column structure with the sand carrying function, the flow channel comprises a plurality of sand blocking piece air holes, the plurality of sand blocking piece air holes are arranged on the sand blocking piece female face along the axial direction, and one end of the sand blocking piece air hole penetrates through the rotor spiral.

[0016] According to the application, the both ends of the stator cylinder are respectively provided with a stator female buckle and a stator male buckle, the both ends of the centralizer outer cylinder are respectively provided with a centralizer female buckle and a centralizer male buckle, the stator female buckle is matched with the centralizer male buckle, and the stator male buckle is matched with the centralizer female buckle.

[0017] According to the application, the both ends of the stator cylinder are respectively provided with a stator female buckle and a stator male buckle, the both ends of the centralizer outer cylinder are respectively provided with a centralizer female buckle and a centralizer male buckle, the stator female buckle is matched with the centralizer male buckle, and the stator male buckle is matched with the centralizer female buckle.

[0018] According to the application, the both ends of the stator cylinder are respectively provided with a stator female buckle and a stator male buckle, the both ends of the centralizer outer cylinder are respectively provided with a centralizer female buckle and a centralizer male buckle, the stator female buckle is matched with the centralizer male buckle, and the stator male buckle is matched with the centralizer female buckle.

[0019] Compared with the prior art, the application has the following advantages and technical effects:

[0020] 1. The drainage gas recovery system with sand carrying function comprises the drainage gas recovery process string structure with sand carrying function, wherein one end of the centralizer away from the stator is connected with a motor, the output end of the motor is limitingly connected with one end of the rotor, and the motor is connected with a cable.

[0021] 2. The drainage gas recovery process string structure and system with sand carrying function can reverse the solid matters to the oil jacket annulus by reversing the motor when the solid matters such as scale and sand are deposited at the pump outlet, the high-speed permanent magnet motor can meet the needs of wider yield and lifting head, the centralizer is a bearing structure, the motor energy can be effectively transmitted, and the rotation efficiency of the rotor is improved, the application has wide application scenarios, is suitable for special well conditions such as shale oil, polymer flooding, composite flooding and the like, and can also be used in downhole high-temperature, high-sand-liquid-ratio and other environments such as heavy oil thermal recovery. 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 following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 Schematic diagram of the stator structure of the present invention;

[0025] Figure 3 Schematic diagram of the rotor structure of the present invention;

[0026] Figure 4 Schematic diagram of the structure of the centralizer of the present invention;

[0027] Figure 5 Schematic diagram of the sand arrester structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the stator, rotor and centralizer installed in the present invention;

[0029] Figure 7 This is a schematic diagram of the internal side structure of the inner cylinder of the centralizer of the present invention;

[0030] Figure 8 This is a schematic diagram of the internal top surface structure of the inner cylinder of the centralizer of the present invention;

[0031] Figure 9 This is a schematic diagram of the overall structure of the motor of the present invention;

[0032] Figure 10 This is a schematic diagram of the connecting rod structure of the present invention;

[0033] Wherein, 1, stator; 101, stator spiral; 102, stator female buckle; 103, stator male buckle; 104, stator clamping block; 105, stator clamping groove; 2, rotor; 201, cylindrical core; 202, rotor spiral; 203, sand blocking device; 2031, sand blocking device male face; 2032, sand blocking device female face; 2033, sand blocking device air hole; 204, connecting end; 2041, connecting end hole groove; 3, centralizer; 301, centralizer outer cylinder; 3011, centralizer female buckle; 3012, centralizer male buckle; 3013, centralizer clamping block; 3014, centralizer clamping groove; 302, centralizer inner cylinder; 3021, ball bearing; 3022, slide rail; 3023, centralizer inner cylinder cover; 303, connecting rib; 4, connecting rod; 5, motor; 501, motor female buckle; 502, motor clamping block; 503, motor clamping groove; 504, motor output end; 5041, motor output end hole groove; 505, cable connecting hole; 6, cable. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0035] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] Reference Figures 1-10 The present application provides a drainage gas recovery process pipe column structure with sand carrying function, comprising a stator 1 and a rotor 2,

[0037] The stator 1 is connected with a centralizer 3 at both ends, the rotor 2 is located in the stator 1, and the rotor 2 is rotatably connected with the two centralizers 3 at both ends, respectively, the gap between the rotor 2 and the stator 1 forms a spiral flow passage, and the medium is transported through the spiral flow passage;

[0038] The sand blocking device is arranged on the rotor 2, wherein the large particle size sand particles are lifted from the bottom of the well to the wellhead, and the large particle size sand particles are blocked by the arranged sand blocking device;

[0039] The flow channel is arranged on the sand blocking device, which prevents sand and gravel from depositing and realizes the flow of gas.

[0040] In one embodiment of the present application, during use, the stator 1 is provided with a centralizer 3 at each end, and the rotor 2 is located in the stator 1 and connected to the two centralizers 3 at both ends, for rotating in the stator 1. The flow channel formed between the rotor 2 and the stator 1 has a certain tolerance for large-diameter sand particles, and is good in adaptability to conveying media containing more impurities such as dirt and sand. The sand-blocking member can effectively block large-diameter sand particles from sliding down the spiral channel due to their own gravity, and push them forward under the carrying of the fluid, through one after another sand-blocking members to effectively relay, thereby lifting the large-diameter sand particles from the well bottom to the wellhead. The flow channel on the sand-blocking member can prevent sand particles from depositing to form dead sand, and on the other hand, provide a vertical flow channel for gas to achieve good gas flow.

[0041] As an optional implementation, the stator 1 includes a stator cylinder, and three stator spirals 101 are arranged on the inner side wall of the stator cylinder. The starting points of the three stator spirals 101 are located on the same horizontal plane, and the three stator spirals 101 are arranged in a staggered manner.

[0042] In one embodiment of the present application, the stator cylinder is in a cylindrical shape, and three stator spirals 101 are arranged on the inner side of the cylinder in a staggered manner. The tangent lines at each position of the three stator spirals 101 are parallel to each other, the starting points are located on the same plane, and the included angle formed by the connection line and the center of the cylinder is 120°.

[0043] As an optional implementation, the centralizer 3 includes a centralizer outer cylinder 301, and a centralizer inner cylinder 302 is connected to the centralizer outer cylinder 301 through a plurality of connecting ribs 303. One end of the rotor 2 is rotationally connected to the centralizer inner cylinder 302.

[0044] In one embodiment of the present application, the centralizer 3 is concentrically composed of the centralizer outer cylinder 301 and the centralizer inner cylinder 302, and the centralizer outer cylinder 301 and the centralizer inner cylinder 302 are fixedly connected by the connecting ribs 303.

[0045] As an optional implementation, the rotor 2 includes a cylindrical core 201, and a rotor spiral 202 is fixedly connected to the outer side wall of the cylindrical core 201. The sand-blocking member is arranged on the rotor spiral 202 for rotating with the rotor spiral 202. The two ends of the cylindrical core 201 are respectively fixedly connected to a connecting end head 204, and the connecting end head 204 is installed in the centralizer inner cylinder 302.

[0046] In one embodiment of the present application, the rotor spiral 202 is in two pieces, and the two pieces of rotor spiral 202 are arranged in a staggered manner on the cylindrical core 201. The tangent lines at each position of the rotor spiral 202 are parallel to each other, the starting points are located on the same plane, and the connection line passes through the center of the cylindrical core 201.

[0047] As an optional implementation, the sand blocking piece includes a plurality of sand blockers 203 arranged in two rows on two sides of the cylindrical core 201 in the axial direction and fixedly connected to the spiral blades of the rotor spiral 202. The top end of each sand blocker 203 is provided with a sand blocker male face 2031 and a sand blocker female face 2032 on the two sides, respectively. The sand blocker male face 2031 is a sand-facing face and has a slope structure. The sand blocker female face 2032 has an arc structure. The flow channel is located on the sand blocker female face 2032.

[0048] In an embodiment of the present application, the sand blockers 203 are arranged on the two rotor spirals 202. The projections of the left and right adjacent sand blockers 203 on the plane are equal in angle to the angle formed by the line connecting the center of the cylindrical core 201. The sand-facing face of the sand blocker 203 is the sand blocker male face 2031, which is flat and has a slope less than 30°, facilitating the sand particles to flow forward under the driving of the fluid. The sand-accumulating face is the sand blocker female face 2032, which is a curved surface with a rapid decrease in curvature from the highest point to the lower part.

[0049] As an optional implementation, the flow channel includes a plurality of sand blocker air holes 2033 arranged in the axial direction on the sand blocker female face 2032. The sand blocker air holes 2033 penetrate the rotor spiral 202 at one end.

[0050] In an embodiment of the present application, a row of sand blocker air holes 2033 is arranged at the position with the maximum curvature of the sand blocker female face 2032. The sand blocker air holes 2033 penetrate the rotor spiral 202 and the sand blocker 203. On the one hand, a part of the gas can pass through the sand blocker air holes 2033, disturb the sand particles and the fluid deposited at the position with the maximum curvature of the sand blocker female face 2032, prevent them from forming “dead sand”, and drive them to flow forward. On the other hand, it is helpful for the rapid flow of the gas and improves the gas production capacity.

[0051] As an optional implementation, the stator cylinder is provided with a stator female buckle 102 and a stator male buckle 103 at the two ends, respectively. The centralizer outer cylinder 301 is provided with a centralizer female buckle 3011 and a centralizer male buckle 3012 at the two ends, respectively. The stator female buckle 102 and the centralizer male buckle 3012 are matched with each other. The stator male buckle 103 and the centralizer female buckle 3011 are matched with each other. The stator cylinder is provided with a stator clamping block 104 and a stator clamping groove 105 at the two ends and opposite sides, respectively. The centralizer outer cylinder 301 is provided with a centralizer clamping block 3013 and a centralizer clamping groove 3014 at the two ends and opposite sides, respectively. The stator clamping block 104 and the centralizer clamping groove 3014 are matched with each other. The stator clamping groove 105 and the centralizer clamping block 3013 are matched with each other.

[0052] In one embodiment of the present application, one end of the stator 1 is a stator male buckle 103, the other end is a stator female buckle 102, both ends are provided with a stator clamping block 104 and a stator clamping groove 105, the stator clamping block 104 and the stator clamping groove 105 are symmetrically distributed, and when one end is a stator clamping groove 105, the other end is a stator clamping block 104 vertically corresponding; the centralizer outer cylinder 301 is provided with a centralizer male buckle 3012 at one end and a centralizer female buckle 3011 at the other end, both ends are provided with a centralizer clamping block 3013 and a centralizer clamping groove 3014, the centralizer clamping block 3013 and the centralizer clamping groove 3014 are symmetrically distributed, and when one end is a centralizer clamping groove 3014, the other end is a centralizer clamping block 3013 vertically corresponding, the stator 1 and the centralizer 3 are connected through the stator male buckle 103, the stator female buckle 102, the stator clamping block 104, the stator clamping groove 105, the centralizer male buckle 3012, the centralizer female buckle 3011, the centralizer clamping block 3013 and the centralizer clamping groove 3014;

[0053] Further, when one end of the stator 1 is a stator male buckle 103, the other end of the centralizer 3 with a centralizer female buckle 3011 is selected for connection, or when one end of the stator 1 is a stator female buckle 102, the other end of the centralizer 3 with a centralizer male buckle 3012 is selected for connection;

[0054] Further, the stator male buckle 103 and the centralizer female buckle 3011, the stator female buckle 102 and the centralizer male buckle 3012 can be seamlessly connected; the stator clamping block 104 corresponds to the centralizer clamping groove 3014, the stator clamping groove 105 corresponds to the centralizer clamping block 3013, the clamping block can be seamlessly embedded in the clamping groove, and the additional stator clamping block 104, stator clamping groove 105, centralizer clamping block 3013 and centralizer clamping groove 3014 can make the stator 1 and the centralizer 3 more closely connected.

[0055] The cylindrical wall of the stator 1 is equal in thickness to the cylindrical wall of the centralizer outer cylinder 301, and the stator 1 and the centralizer 3 form an equal-diameter structure after connection, which helps the fluid and sand particles in the wellbore to flow upward better

[0056] As an optional implementation, a plurality of sliding rails 3022 are arranged in the inner cylinder wall of the centralizer inner cylinder 302, a plurality of rolling balls 3021 are arranged in the sliding rails 3022, and a centralizer inner cylinder cover 3023 is installed on the centralizer inner cylinder 302.

[0057] In one embodiment of the present application, the inner cylinder 302 of the centralizer has a non-solid structure, and is provided with a plurality of circular arc-shaped sliding rails 3022. The sliding rails 3022 are stacked one above another, and each sliding rail 3022 is concentric with the inner cylinder 302 of the centralizer. Steel balls 3021 are arranged on the sliding rails 3022. The inner cylinder 302 of the centralizer is filled with lubricating liquid to reduce the friction generated when the balls 3021 rotate, and to ensure smooth rotation of the rotor 2. The inner side edges of the two ends of the inner cylinder 302 of the centralizer are provided with grooves, and the inner cylinder cover 3023 of the centralizer can be seamlessly embedded in the grooves. The inner cylinder cover 3023 of the centralizer has a certain elasticity, and the deformation generated when the inner cylinder cover 3023 is embedded in the grooves can be restored.

[0058] A drainage gas recovery system with sand carrying function comprises a drainage gas recovery process pipe column structure with sand carrying function. One end of a centralizer 3 away from a stator 1 is connected with a motor 5. An output end of the motor 5 is limitingly connected with one end of a rotor 2. The motor 5 is connected with a cable 6.

[0059] In one embodiment of the present application, the motor 5 drives the rotor 2 to rotate.

[0060] As an optional implementation, the motor 5 is installed at one end of the centralizer 3 away from the stator 1. A motor female coupling 501 is arranged at the top end of the shell of the motor 5. The motor female coupling 501 is matched with a centralizer male coupling 3012. Motor clamping blocks 502 and a motor clamping groove 503 are arranged at the two ends of the motor female coupling 501, respectively. The motor clamping blocks 502 are matched with centralizer clamping grooves 3014. The motor clamping groove 503 is matched with centralizer clamping blocks 3013.

[0061] A motor output end hole groove 5041 is arranged on a motor output end 504 of the motor 5. A connecting end head hole groove 2041 is arranged on a connecting end head 204. The motor output end hole groove 5041 and the connecting end head hole groove 2041 are connected through a connecting rod 4.

[0062] A cable connecting hole 505 is arranged on the shell of the motor 5. One end of the cable 6 is connected with the motor 5 through the cable connecting hole 505.

[0063] In one embodiment of the present application, the shell of the motor 5 is cylindrical, and its outer diameter is equal to that of the centralizer 3 and the stator 1. The cylindrical shell has a motor female screw 501 at one end, and the motor female screw 501 is provided with motor clamping blocks 502 and motor clamping grooves 503, which are symmetrically distributed. At the same end of the cylindrical shell, a cylindrical motor output end 504 is provided, and the radius of the motor output end 504 is equal to the inner radius of the inner cylinder 302 of the centralizer. The height of the motor output end 504 is half the height of the centralizer 3. The motor output end 504 is provided with a motor output end hole groove 5041 at its center. When the motor 5 is connected to the centralizer 3, the motor output end 504 and the centralizer male screw 3012 are seamlessly embedded in the centralizer inner cylinder 302 and the motor female screw 501, respectively. At the same time, the motor clamping blocks 502 are seamlessly embedded in the centralizer clamping grooves 3014, and the motor clamping grooves 503 are seamlessly fitted with the centralizer clamping blocks 3013. The connecting rod 4 is placed in the motor output end hole groove 5041. The connecting rod 4 is a regular hexagon, and its shape and size are the same as those of the motor output end hole groove 5041. One part of the connecting rod 4 is placed in the motor output end hole groove 5041, and the other part is placed in the connecting end hole groove 2041 of the rotor 2.

[0064] Specifically, the length of the connecting rod 4 is equal to twice the depth of the motor output end hole groove 5041.

[0065] Specifically, the cable 6 is placed outside the pipe string formed by the connection of the motor 5, the centralizer 3, and the drainage and gas recovery process pipe column structure with sand carrying function, and is lowered into the oil and gas well together with the pipe string.

[0066] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0067] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A drainage gas recovery process pipe column structure with sand carrying function, comprising a stator (1) and a rotor (2), characterized in that: the stator (1) is connected with a centralizer (3) at both ends, the rotor (2) is located in the stator (1), and the rotor (2) is rotatably connected with the two centralizers (3) at both ends, respectively, the gap between the rotor (2) and the stator (1) forms a spiral flow passage, and the medium is transported through the spiral flow passage; a sand blocking piece is arranged on the rotor (2), wherein the large particle size sand particles are blocked by the arranged sand blocking piece during the lifting from the bottom to the wellhead; a flow channel is arranged on the sand blocking piece, which prevents sand deposition and realizes the flow of gas; the centralizer (3) comprises a centralizer outer cylinder (301), a centralizer inner cylinder (302) is connected in the centralizer outer cylinder (301) through a plurality of connecting ribs (303), and one end of the rotor (2) is rotatably connected with the centralizer inner cylinder (302); the rotor (2) comprises a cylindrical core (201), a rotor spiral (202) is fixedly connected to the outer side wall of the cylindrical core (201), the sand blocking piece is arranged on the rotor spiral (202) and rotates with the rotor spiral (202), and the cylindrical core (201) is fixedly connected with a connecting end head (204) at both ends, respectively; the connecting end head (204) is installed in the centralizer inner cylinder (302); the sand blocking piece comprises a plurality of sand blocking pieces (203), a plurality of the sand blocking pieces (203) are arranged in two rows along the axial direction and located on both sides of the cylindrical core (201), and are fixedly connected to the spiral blades of the rotor spiral (202); a sand blocking piece male face (2031) and a sand blocking piece female face (2032) are arranged on both sides of the top end of the sand blocking piece (203), respectively, the sand blocking piece male face (2031) is a sand facing surface, the sand blocking piece male face (2031) is a beveled structure, the sand blocking piece female face (2032) is an arc structure, and the flow channel is located on the sand blocking piece female face (2032); the flow channel comprises a plurality of sand blocking piece air holes (2033), a plurality of the sand blocking piece air holes (2033) are opened on the sand blocking piece female face (2032) along the axial direction, and one end of the sand blocking piece air hole (2033) penetrates the rotor spiral (202).

2. The drainage gas recovery work string structure with sand carrying function according to claim 1, characterized in that: the stator (1) comprises a stator cylinder, and three stator spirals (101) are arranged on the inner side wall of the stator cylinder, the starting points of the three stator spirals (101) are located on the same horizontal plane, and the three stator spirals (101) are arranged alternately.

3. The drainage gas recovery work string structure with sand carrying function according to claim 1, characterized in that: The stator cylinder is provided with a stator female buckle (102) and a stator male buckle (103) at two ends respectively, the centralizer outer cylinder (301) is provided with a centralizer female buckle (3011) and a centralizer male buckle (3012) at two ends respectively, the stator female buckle (102) and the centralizer male buckle (3012) are matched, the stator male buckle (103) and the centralizer female buckle (3011) are matched; the two ends of the stator cylinder are respectively provided with a stator clamping block (104) and a stator clamping groove (105) on opposite sides, the two ends of the centralizer outer cylinder (301) are respectively provided with a centralizer clamping block (3013) and a centralizer clamping groove (3014) on opposite sides, the stator clamping block (104) and the centralizer clamping groove (3014) are matched, and the stator clamping groove (105) and the centralizer clamping block (3013) are matched.

4. The drainage gas recovery work string structure with sand carrying function according to claim 1, characterized in that: The centralizer inner cylinder (302) is provided with a plurality of sliding rails (3022) in the cylinder wall, the sliding rails (3022) are provided with a plurality of ball bearings (3021) therein, and the centralizer inner cylinder (302) is provided with a centralizer inner cylinder cover (3023).

5. A drainage gas recovery system with sand-carrying function, comprising the process string structure with sand-carrying function according to any one of claims 1-4, characterized in that: One end of the centralizer (3) away from the stator (1) is connected with a motor (5), an output end of the motor (5) is in limiting connection with one end of the rotor (2), and the motor (5) is connected with a cable (6).

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