Water drainage and gas recovery process pipe column structure and system with sand carrying function

Abstract

The invention relates to the technical field of gas production systems, and discloses a water drainage and gas production process pipe column structure and system with a sand carrying function, the water drainage and gas production process pipe column structure comprises a stator and a rotor, the two ends of the stator are connected with centralizers, the rotor is located in the stator, and the two ends of the rotor are rotationally connected with the two centralizers respectively; the rotor and the stator are in clearance fit to form a spiral overflowing channel, and a medium is conveyed through the spiral overflowing channel; the sand blocking piece is arranged on the rotor, and in the process that the large-particle-size sand grains are lifted from the well bottom to the well mouth, the large-particle-size sand grains are blocked through the arranged sand blocking piece; and the flowing channel is arranged on the sand blocking piece, and the flowing channel is used for preventing deposition of gravels and realizing circulation of gas. The device can effectively prevent sand blockage, avoid damage to a tubular column structure, effectively prevent large-particle-size sand grains from sliding off, assist fluid in carrying sand, realize fast flow of good gas, improve gas output capacity and guarantee gas production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of gas production systems, and particularly to a drainage gas production process string structure and system with a sand-carrying function. Background Art

[0002] During the process of natural gas production, the reduction of formation pressure will cause formation water to gradually advance towards the bottom of the well and then enter the wellbore. When the gas production rate is less than the minimum liquid-carrying gas flow rate, the formation water will start to accumulate in the wellbore to form liquid accumulation. These liquid accumulations not only reduce the gas production efficiency of the gas well, but also may cause bottom water flooding in severe cases, resulting in gas well water blockage and production shutdown. In addition, sand plugs may be formed at the bottom of the well due to wellbore collapse or accumulation of fracturing proppants (such as quartz sand, ceramsite, etc.), further hindering gas flow. The dual effects of liquid accumulation and sand plugs make it difficult to fully release the production capacity of gas wells. In view of this, there is an urgent need to develop a drainage gas production process string structure and system with a sand-carrying function to effectively solve the above problems and ensure stable natural gas production.

[0003] The existing utility model patent application document with the publication number CN210289730U discloses a mechanical oil production mechanism and system with a double helix structure. The patent includes components such as a stator and a rotor. A spiral blade is arranged on the outer periphery of the rotor, and a spiral channel is arranged on the inner wall of the stator. The spiral blade is adapted to the spiral channel, and the gap between the two forms a chamber. Driven by a driving mechanism, when the rotor moves in the stator, it does not contact the stator, and the sand-containing heavy oil in the chamber is lifted.

[0004] The existing technology uses a driving mechanism to drive the rotor to rotate in the stator, driving the sand-containing liquid in the chamber to flow upward along the spiral channel to achieve the lifting of the liquid. For the application scenario of sand-containing heavy oil production, this technology can effectively carry sand and avoid sand jamming. However, for the gas production scenario that requires both sand-carrying and drainage, since the viscosity of gas is smaller and the flow rate is faster than that of heavy oil, the sand-carrying and drainage effect of this technology is not ideal, and at the same time, the spiral structure also has a certain obstructive effect on gas flow.

[0005] Therefore, there is an urgent need for a drainage gas production process string structure and system with a sand-carrying function to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a drainage gas production process string structure and system with a sand-carrying function to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above purpose, the present invention provides the following solution: The present invention provides a drainage gas production process string structure with a sand-carrying function, including a stator and a rotor.

[0008] The two ends of the stator are connected with centralizers. The rotor is located inside the stator, and the two ends of the rotor are respectively rotationally connected with the two centralizers. A spiral flow passage is formed by the clearance fit between the rotor and the stator, and a medium is transported through the spiral flow passage.

[0009] A sand blocking member is arranged on the rotor. When large-particle sand grains are lifted from the bottom of the well to the wellhead, the large-particle sand grains are blocked by the arranged sand blocking member.

[0010] A flow passage is arranged on the sand blocking member. The flow passage prevents sand and gravel from depositing and realizes the circulation of gas.

[0011] According to a drainage gas production process string structure with a sand-carrying function provided by the present invention, the stator includes a stator cylinder body. Three stator spirals are arranged on the inner side wall of the stator cylinder body. The starting points of the three stator spirals are all on the same horizontal plane, and the three stator spirals are arranged staggeredly.

[0012] According to a drainage gas production process string structure with a sand-carrying function provided by the present invention, the centralizer includes a centralizer outer cylinder. A centralizer inner cylinder is connected in the centralizer outer cylinder through a plurality of connecting ribs. One end of the rotor is rotationally connected with the centralizer inner cylinder.

[0013] According to a drainage gas production process string structure with a sand-carrying function provided by the present invention, the rotor includes a cylindrical core. A rotor spiral is fixedly connected to the outer side wall of the cylindrical core. The sand blocking member is arranged on the rotor spiral and is used to rotate along with the rotor spiral. Connecting ends are respectively fixedly connected to both ends of the cylindrical core, and the connecting ends are installed in the centralizer inner cylinder.

[0014] According to a drainage gas production process string structure with a sand-carrying function provided by the present invention, the sand blocking member includes a plurality of sand blockers. The plurality of sand blockers are arranged in two rows along the axial direction and are respectively located on both sides of the cylindrical core, and are fixedly connected to the spiral blades of the rotor spiral. The two sides of the top of the sand blocker are respectively provided with a sand blocker positive surface and a sand blocker negative surface. The sand blocker positive surface is the sand-facing surface, the sand blocker positive surface is an inclined surface structure, the sand blocker negative surface is an arc structure, and the flow passage is located on the sand blocker negative surface.

[0015] According to a drainage gas production process string structure with a sand-carrying function provided by the present invention, the flow passage includes a plurality of sand blocker air holes. The plurality of sand blocker air holes are axially opened on the sand blocker negative surface, and one end of the sand blocker air hole penetrates through the rotor spiral.

[0016] A drainage gas production process string structure with sand-carrying function provided by the present invention, wherein stator female threads and stator male threads are respectively provided at both ends of the stator cylinder body, and a centralizer female thread and a centralizer male thread are respectively provided at both ends of the centralizer outer cylinder. The stator female thread is adapted to the centralizer male thread, and the stator male thread is adapted to the centralizer female thread; stator blocks and stator grooves are respectively provided on both opposite sides at both ends of the stator cylinder body, and centralizer blocks and centralizer grooves are respectively provided on both opposite sides at both ends of the centralizer outer cylinder. The stator block is adapted to the centralizer groove, and the stator groove is adapted to the centralizer block.

[0017] A drainage gas production process string structure with sand-carrying function provided by the present invention, wherein a plurality of sliding rails are provided in the wall of the centralizer inner cylinder, a plurality of balls are provided in the sliding rails, and a centralizer inner cylinder cover is installed on the centralizer inner cylinder.

[0018] A drainage gas production system with sand-carrying function, including a drainage gas production process string structure with sand-carrying function. One end of the centralizer away from the stator is connected to a motor, the output end of the motor is limitedly connected to one end of the rotor, and the motor is connected to a cable.

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

[0020] 1. For the drainage gas production process string structure with sand-carrying function provided by the present invention, centralizers are installed at both ends of the stator. The rotor is located inside the stator and is respectively connected to the two centralizers at both ends for rotation inside the stator. A spiral flow-through channel is formed between the rotor and the stator. The stator and the rotor do not directly contact, resulting in small frictional wear and long system service life. The spiral flow-through channel has a certain tolerance for large-particle-size sand grains and good adaptability to conveying media containing more impurities such as scale and sand. By setting the sand-blocking members, large-particle-size sand grains can be effectively blocked from sliding down along the spiral channel due to their own gravity. Under the carrying of the fluid, they are pushed towards the front sand-blocking member, and through the effective relay of one sand-blocking member after another, the large-particle-size sand grains can be lifted from the bottom of the well to the wellhead. At the same time, the flow channels on the sand-blocking members can, on the one hand, prevent sand grains from depositing to form dead sand, and on the other hand, provide a vertical flow channel for the gas to achieve the effect of good gas flow and fast flow.

[0021] 2. For the drainage gas production process string structure and system with sand-carrying function provided by the present invention, when solids such as scale and sand are deposited at the pump outlet, the solids can be backflushed into the annulus between the tubing and the casing by reversing the motor. Equipped with a high-speed permanent magnet motor, it can meet the requirements of a wider range of production and lifting head. The centralizer is a bearing structure, which can effectively transfer the energy of the motor and improve the rotation efficiency of the rotor. The present invention has a wide range of application scenarios. In addition to being used in drainage gas production well conditions, it is also applicable to special well conditions such as shale oil, polymer flooding, and composite flooding, and can also be used in downhole high-temperature and high sand-liquid ratio environments such as heavy oil thermal recovery. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

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

[0024] Figure 2 It is a schematic diagram of the stator structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the rotor structure of the present invention;

[0026] Figure 4 It is a schematic diagram of the centralizer structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the sand arrester structure of the present invention;

[0028] Figure 6 It is a schematic diagram of the installation state of the stator, rotor and centralizer of the present invention;

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

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

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

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

[0033] Among them, 1. Stator; 101. Stator helix; 102. Female stator buckle; 103. Male stator buckle; 104. Stator clamping block; 105. Stator clamping groove; 2. Rotor; 201. Cylindrical core; 202. Rotor helix; 203. Sand blocker; 2031. Positive side of the sand blocker; 2032. Negative side of the sand blocker; 2033. Air hole of the sand blocker; 204. Connection end; 2041. Hole groove of the connection end; 3. Centralizer; 301. Outer cylinder of the centralizer; 3011. Female buckle of the centralizer; 3012. Male buckle of the centralizer; 3013. Clamping block of the centralizer; 3014. Clamping groove of the centralizer; 302. Inner cylinder of the centralizer; 3021. Ball; 3022. Slide rail; 3023. Inner cylinder cover of the centralizer; 303. Connecting rib; 4. Connecting rod; 5. Motor; 501. Female motor buckle; 502. Motor clamping block; 503. Motor clamping groove; 504. Motor output end; 5041. Hole groove of the motor output end; 505. Cable connection hole; 6. Cable. Detailed implementation manners

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0036] Referring to Figures 1 - 10 , the present invention provides a drainage gas production process string structure with a sand-carrying function, including a stator 1 and a rotor 2.

[0037] The two ends of the stator 1 are connected with centralizers 3. The rotor 2 is located inside the stator 1, and the two ends of the rotor 2 are respectively rotatably connected to the two centralizers 3. A spiral flow passage is formed by the clearance fit between the rotor 2 and the stator 1, and the medium is transported through the spiral flow passage.

[0038] A sand blocking member is arranged on the rotor 2. During the process of lifting large-particle sand from the bottom of the well to the wellhead, the large-particle sand is blocked by the arranged sand blocking member.

[0039] A flow passage is arranged on the sand blocking member, and the flow passage prevents sand and gravel from depositing and realizes the circulation of gas.

[0040] In one embodiment of the present application, when in use, both ends of the stator 1 are equipped with stabilizers 3, the rotor 2 is located in the stator 1, and the two ends are respectively connected to the two stabilizers 3 for rotating in the stator 1. The flow channel formed between the rotor 2 and the stator 1 is wide, has a certain tolerance for large-size sand particles, and has good adaptability to the conveying medium containing more impurities such as scale and sand. The sand blocking parts set can effectively prevent large-size sand particles from sliding down the spiral channel due to their own gravity, and move toward the sand blocking parts in front under the carry of the fluid. Through the effective relay of one sand blocking part after another, the large-size sand particles are lifted from the bottom of the well to the wellhead. At the same time, the flow channel on the sand blocking part can prevent the sand particles from depositing to form dead sand on the one hand, and provide a vertical flow channel for the gas on the other hand, so as to achieve a good gas and fast flow effect.

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

[0042] In one embodiment of the present application, the stator cylinder is in the shape of a cylinder, and three stator spirals 101 are arranged on the inner side of the cylinder, and the tangent lines of each stator spiral 101 are parallel to each other, the starting points are located on the same plane, and the angle formed with the line connecting the center of the circle is 120°.

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

[0044] In one embodiment of the present application, the centralizer 3 is composed of a centralizer outer cylinder 301 and a centralizer inner cylinder 302 which are concentric with each other. The centralizer outer cylinder 301 and the centralizer inner cylinder 302 are fixedly connected by a connecting rib 303 .

[0045] As an optional embodiment, the rotor 2 includes a cylindrical core 201, a rotor spiral 202 is fixedly connected to the outer wall of the cylindrical core 201, a sand blocking member is arranged on the rotor spiral 202, and is used to rotate with the rotor spiral 202, and the two ends of the cylindrical core 201 are respectively fixedly connected with connecting ends 204, and the connecting ends 204 are installed in the inner tube 302 of the stabilizer.

[0046] In one embodiment of the present application, there are two rotor spirals 202 , which are staggered on the cylindrical core 201 , and each tangent of the rotor spirals 202 is parallel to each other, and their starting points are located on the same plane, and the connecting line passes through the center of the cylindrical core 201 .

[0047] As an optional embodiment, the sand blocker includes a plurality of sand blockers 203, which are axially arranged into two rows and respectively located on both sides of the cylindrical core 201, and fixedly connected to the spiral blades of the rotor spiral 202. A positive surface 2031 and a negative surface 2032 of the sand blocker are respectively provided on both sides of the top of the sand blocker 203. The positive surface 2031 of the sand blocker is a sand facing surface, the positive surface 2031 of the sand blocker is an inclined structure, the negative surface 2032 of the sand blocker is an arc structure, and the flow channel is located on the negative surface 2032 of the sand blocker.

[0048] In one embodiment of the present application, the sand blocker 203 is arranged on two rotor spirals 202, and the projections of the two adjacent sand blockers 203 on the plane are equal to the angle formed by the line connecting the centers of the cylindrical core 201. The sand-facing surface of the sand blocker 203 is the positive surface 2031 of the sand blocker, and the surface is straight and extended. It is recommended that the slope be kept below 30° to facilitate the forward flow of sand particles driven by the fluid; the sand accumulation surface is the negative surface 2032 of the sand blocker, and the surface is a curved surface. The curvature decreases rapidly from the highest point downward, and the curved surface is transformed into a flat surface.

[0049] As an optional implementation, the flow channel includes a plurality of sand blocker air holes 2033 , which are axially opened on the sand blocker negative surface 2032 , and one end of the sand blocker air hole 2033 passes through the rotor spiral 202 .

[0050] In one embodiment of the present application, a row of sand blocker air holes 2033 are provided at the largest curvature of the sand blocker's rear side 2032. The sand blocker air holes 2033 penetrate the rotor spiral 202 and the sand blocker 203. On the one hand, a portion of the gas can pass through the sand blocker air holes 2033 to disturb the sand particles and fluid deposited on the largest curvature of the sand blocker's rear side 2032, preventing them from forming "dead sand" and driving them to flow forward. On the other hand, it helps the gas to flow quickly and improves the gas production capacity.

[0051] As an optional embodiment, a stator female buckle 102 and a stator male buckle 103 are respectively provided at both ends of the stator cylinder, and a centralizer female buckle 3011 and a centralizer male buckle 3012 are respectively provided at both ends of the centralizer outer cylinder 301. The stator female buckle 102 and the centralizer male buckle 3012 are adapted to each other, and the stator male buckle 103 and the centralizer female buckle 3011 are adapted to each other; a stator clamping block 104 and a stator clamping slot 105 are respectively provided on opposite sides of the two ends of the stator cylinder, and a centralizer clamping block 3013 and a centralizer clamping slot 3014 are respectively provided on opposite sides of the two ends of the centralizer outer cylinder 301, and the stator clamping block 104 and the centralizer clamping slot 3014 are adapted to each other, and the stator clamping slot 105 and the centralizer clamping block 3013 are adapted to each other.

[0052] In one embodiment of the present application, one end of the stator 1 is a male stator buckle 103, and the other end is a female stator buckle 102. Both ends are provided with a stator block 104 and a stator slot 105. The stator block 104 and the stator slot 105 are symmetrically distributed. When one end is the stator slot 105, the vertical corresponding end on the other side is the stator block 104; one end of the centralizer outer cylinder 301 is provided with a male centralizer buckle 3012, and the other end is provided with a female centralizer buckle 3011. Both ends are provided with a centralizer block 3013 and a centralizer slot 3014. The centralizer block 3013 and the centralizer slot 3014 are symmetrically distributed. When one end is the centralizer slot 3014, the vertical corresponding end on the other side is the centralizer block 3013. The stator 1 and the centralizer 3 are connected through the male stator buckle 103, the female stator buckle 102, the stator block 104, the stator slot 105, the male centralizer buckle 3012, the female centralizer buckle 3011, the centralizer block 3013, and the centralizer slot 3014;

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

[0054] Further, the male stator buckle 103 and the female centralizer buckle 3011, the female stator buckle 102 and the male centralizer buckle 3012 can be seamlessly and tightly connected; the stator block 104 corresponds to the centralizer slot 3014, and the stator slot 105 corresponds to the centralizer block 3013. The block can be seamlessly embedded in the slot. By adding the stator block 104, the stator slot 105, the centralizer block 3013, and the centralizer slot 3014, the connection between the stator 1 and the centralizer 3 can be made more compact.

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

[0056] As an alternative embodiment, a plurality of slide rails 3022 are provided inside the wall of the centralizer inner cylinder 302, and a plurality of balls 3021 are provided inside the slide rails 3022. A centralizer inner cylinder cover 3023 is installed on the centralizer inner cylinder 302.

[0057] In an embodiment of the present application, the wall of the centralizer inner cylinder 302 is a non-solid structure, and is provided with several arc-shaped sliding rails 3022 inside. The sliding rails 3022 are stacked up and down, and each sliding rail 3022 is concentric with the centralizer inner cylinder 302. The sliding rails 3022 are covered with steel balls 3021. The wall of the centralizer inner cylinder 302 is filled with lubricating fluid to reduce the frictional force generated when the balls 3021 rotate, ensuring that the rotor 2 rotates more smoothly. On the inner side edges of the two ends of the wall of the centralizer inner cylinder 302, there are grooves, and the centralizer inner cylinder cover 3023 can be seamlessly embedded into the grooves. The centralizer inner cylinder cover 3023 has a certain elasticity, and the deformation generated when it is embedded into the grooves can be restored.

[0058] A drainage gas production system with a sand-carrying function includes a drainage gas production process pipe string structure with a sand-carrying function. One end of a centralizer 3 away from the stator 1 is connected to a motor 5. The output end of the motor 5 is connected to one end of the rotor 2 in a limited way, and the motor 5 is connected to a cable 6.

[0059] In an embodiment of the present application, the motor 5 is provided to drive the rotor 2 to rotate.

[0060] As an optional implementation manner, the motor 5 is installed at one end of the centralizer 3 away from the stator 1. The top of the housing of the motor 5 is provided with a motor female thread 501, and the motor female thread 501 is adapted to the centralizer male thread 3012. Motor blocks 502 and motor slots 503 are respectively arranged at both ends of the motor female thread 501. The motor block 502 is adapted to the centralizer slot 3014, and the motor slot 503 is adapted to the centralizer block 3013;

[0061] A motor output end hole slot 5041 is provided on the motor output end 504 of the motor 5, and a connection end hole slot 2041 is provided on the connection end 204. The motor output end hole slot 5041 and the connection end hole slot 2041 are connected by a connecting rod 4;

[0062] A cable connection hole 505 is provided on the housing of the motor 5, and one end of an external cable 6 is connected to the motor 5 through the cable connection hole 505.

[0063] In an embodiment of the present application, the housing of the motor 5 is cylindrical, and its outer diameter is equal to the outer diameters of the centralizer 3 and the stator 1. A female motor connection 501 is provided at one end of the cylinder. On the female motor connection 501, there are motor blocks 502 and motor slots 503, which are symmetrically distributed; at the same end of the cylinder, there is a cylindrical motor output end 504, whose radius is equal to the inner radius of the inner cylinder 302 of the centralizer; the height of the motor output end 504 is half of the height of the centralizer 3. At the center of the motor output end 504, there is a motor output end hole slot 5041. When the motor 5 is connected to the centralizer 3, the motor output end 504 and the male centralizer connection 3012 are seamlessly inserted into the inner cylinder 302 of the centralizer and the female motor connection 501 respectively. At the same time, the motor blocks 502 are seamlessly inserted into the centralizer slots 3014, the motor slots 503 are seamlessly fitted with the centralizer blocks 3013, and a connecting rod 4 is placed in the motor output end hole slot 5041. The connecting rod 4 is regular hexagon-shaped, and its shape and size are the same as those of the motor output end hole slot 5041. A part of the connecting rod 4 is placed in the motor output end hole slot 5041, and the other part is placed in the connection end hole slot 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 slot 5041.

[0065] Specifically, the cable 6 is placed outside the pipe string formed by connecting the motor 5, the centralizer 3 and the drainage gas production process pipe string 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 invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying 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 construed as a limitation to the present invention.

[0067] The embodiments described above are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A drainage gas production process string structure with sand-carrying function, comprising a stator (1) and a rotor (2), characterized in that: The two ends of the stator (1) are connected with centralizers (3), the rotor (2) is located inside the stator (1), and the two ends of the rotor (2) are respectively rotatably connected with the two centralizers (3). A spiral flow passage is formed by the clearance fit between the rotor (2) and the stator (1), and the medium is transported through the spiral flow passage; A sand blocking member is arranged on the rotor (2), and during the process of lifting large-particle sand from the bottom of the well to the wellhead, the large-particle sand is blocked by the arranged sand blocking member; A flow passage is arranged on the sand blocking member, and the flow passage prevents sand and gravel from depositing and realizes the circulation of gas.

2. The string structure of a drainage gas production process with sand-carrying function according to claim 1, characterized in that: The stator (1) includes a stator cylinder body, and three stator spirals (101) are arranged on the inner side wall of the stator cylinder body. The starting points of the three stator spirals (101) are all on the same horizontal plane, and the three stator spirals (101) are arranged in a staggered manner.

3. The structure of a drainage gas production process string with a sand-carrying function according to claim 2, characterized in that: The centralizer (3) includes a centralizer outer cylinder (301), and a centralizer inner cylinder (302) is connected inside the centralizer outer cylinder (301) through a plurality of connecting ribs (303). One end of the rotor (2) is rotatably connected with the centralizer inner cylinder (302).

4. A sand-carrying drainage gas production process string structure according to claim 3, characterized in that: The rotor (2) includes a cylindrical core (201), a rotor spiral (202) is fixedly connected to the outer side wall of the cylindrical core (201), and the sand blocking member is arranged on the rotor spiral (202) and is used to rotate along with the rotor spiral (202). Connecting ends (204) are respectively fixedly connected to both ends of the cylindrical core (201), and the connecting ends (204) are installed inside the centralizer inner cylinder (302).

5. A tubing string structure for a drainage gas production process with sand-carrying function according to claim 4, characterized in that: The sand blocking member includes a plurality of sand blockers (203), and the plurality of sand blockers (203) are arranged in two rows along the axial direction on both sides of the cylindrical core (201) and are fixedly connected to the spiral blades of the rotor spiral (202). Sand blocker yang surfaces (2031) and sand blocker yin surfaces (2032) are respectively arranged on both sides of the top of the sand blocker (203). The sand blocker yang surface (2031) is the sand-facing surface, the sand blocker yang surface (2031) is an inclined surface structure, the sand blocker yin surface (2032) is an arc structure, and the flow passage is located on the sand blocker yin surface (2032).

6. A string structure for drainage gas production process with sand-carrying function according to claim 5, characterized in that: The flow passage includes a plurality of sand blocker air holes (2033), and the plurality of sand blocker air holes (2033) are axially formed on the sand blocker yin surface (2032), and one end of the sand blocker air hole (2033) penetrates through the rotor spiral (202).

7. The string structure of a drainage gas production process with sand-carrying function according to claim 4, wherein: At both ends of the stator cylinder body, a stator female buckle (102) and a stator male buckle (103) are respectively provided. At both ends of the centralizer outer cylinder (301), a centralizer female buckle (3011) and a centralizer male buckle (3012) are respectively provided. The stator female buckle (102) is adapted to the centralizer male buckle (3012), and the stator male buckle (103) is adapted to the centralizer female buckle (3011). At opposite sides of both ends of the stator cylinder body, a stator block (104) and a stator slot (105) are respectively provided. At opposite sides of both ends of the centralizer outer cylinder (301), a centralizer block (3013) and a centralizer slot (3014) are respectively provided. The stator block (104) is adapted to the centralizer slot (3014), and the stator slot (105) is adapted to the centralizer block (3013).

8. A sand-carrying drainage gas production process string structure according to claim 3, characterized in that: A plurality of sliding rails (3022) are provided inside the wall of the centralizer inner cylinder (302). A plurality of balls (3021) are provided inside the sliding rails (3022). A centralizer inner cylinder cover (3023) is installed on the centralizer inner cylinder (302).

9. A drainage gas production system with sand-carrying function, comprising a drainage gas production process string structure with sand-carrying function according to any one of claims 1-8, characterized in that: One end of the centralizer (3) far from the stator (1) is connected to a motor (5). The output end of the motor (5) is connected in a limited way to one end of the rotor (2). The motor (5) is connected to a cable (6).

Images