Gas and sand anchor suitable for horizontal gas well and oil and gas well equipment

Abstract

The invention relates to the technical field of oil and gas field exploitation, and discloses a gas and sand anchor suitable for a horizontal gas well and oil and gas well equipment. The outer sleeve is provided with a plurality of liquid inlets communicating with the storage space and a plurality of gas outlets used for discharging gas, and the liquid inlets are used for receiving liquid flowing in from the storage space. The central pipe is coaxially nested in the outer sleeve, a conveying flow channel for liquid circulation is arranged between the central pipe and the outer sleeve, the first end of the central pipe is connected with an oil pump, and a liquid collecting opening communicated with the conveying flow channel is formed in the second end of the central pipe. The flexible magnetic part separates the liquid inlet and the air outlet. The guide piece is rotatably and coaxially arranged on the central pipe in a sleeving mode at intervals, the guide piece is provided with a flow guide cambered surface which is sunken towards one side of the central pipe, the flow guide cambered surface is arranged corresponding to the multiple liquid inlets, gas in the conveying flow channel can be discharged into the storage space through the gas outlet, and liquid in the conveying flow channel can be guided to the second end of the central pipe; the liquid conveying efficiency is improved, and the technical problem that the liquid inlet efficiency of the gas and sand anchor is low is solved.

Description

Technical Field

[0001] This application belongs to the field of oil and gas field development technology, specifically relating to a gas sand anchor and oil and gas well equipment suitable for horizontal gas wells. Background Technology

[0002] In horizontal gas wells, the gas-liquid ratio is high, typically requiring the use of gas sand anchors for downhole gas-liquid separation. In existing technologies, when the fluid discharge rate of the artificial lift equipment exceeds the fluid supply rate from the tubing and casing annulus to the gas sand anchor, as the fluid volume in the gas sand anchor decreases, the gas phase in the tubing and casing annulus will directly connect to the artificial lift equipment through the central tube of the gas sand anchor. This continuous intrusion of gas phase into the artificial lift equipment can easily cause damage due to cavitation and dry abrasion. Therefore, existing gas sand anchor technologies suffer from low fluid inflow efficiency. Summary of the Invention

[0003] The purpose of this application is to provide a gas sand anchor and oil and gas well equipment suitable for horizontal gas wells, and to solve the technical problem of low fluid injection efficiency of gas sand anchors suitable for horizontal gas wells in the prior art.

[0004] In an embodiment of the present invention, a gas sand anchor suitable for horizontal gas wells is proposed, which is installed in the storage space of the wellbore. The gas sand anchor suitable for horizontal gas wells includes: The outer casing extends along the length of the wellbore. Multiple liquid inlets and multiple gas outlets are provided on the outer casing to communicate with the storage space. The liquid inlets are used to receive liquid flowing in from the storage space, and the gas outlets are used to discharge gas. The central tube is coaxially nested inside the outer tube. There is a conveying channel between the central tube and the outer tube for liquid flow. The first end of the central tube is connected to an oil pump, and the second end is provided with a liquid collection port that communicates with the conveying channel. The flexible magnetic suction element is arranged on the outer wall of the outer sleeve and can be adsorbed on the inner wall of the well barrel. The side of the flexible magnetic suction element away from the oil pump has a liquid inlet and the other side has an air outlet. The guide is rotatably and coaxially spaced on the central tube and extends along the length of the outer tube. The guide has a flow-guiding arc surface recessed towards the central tube. The flow-guiding arc surface is set at the positions of multiple liquid inlets. The liquid in the conveying channel can be guided to the second end of the central tube through the flow-guiding arc surface, and the gas in the conveying channel can be discharged to the storage space through the gas outlet.

[0005] In an embodiment of the present invention, the guide includes a guide portion, a mounting portion, and guide balls. A flow-guiding arc surface is formed on the guide portion. The mounting portion is an annular structure and is coaxially spaced around the outer periphery of the central tube. Both ends of the guide portion along the length direction are connected to a mounting portion. There are multiple guide balls, and multiple guide balls are arranged on each mounting portion. The multiple guide balls are in rolling contact with the inner wall surface of the outer tube.

[0006] In an embodiment of the present invention, multiple liquid inlets are arranged corresponding to the flow guiding arc surface, multiple liquid inlets are located near the first end of the outer sleeve, multiple liquid inlets are arranged at intervals along the circumference of the outer sleeve, multiple air outlets are located near the flexible magnetic suction element, and multiple air outlets are arranged at intervals along the circumference of the outer sleeve.

[0007] In an embodiment of the present invention, multiple guide balls are installed on the side of the mounting portion away from the guide portion, and the multiple guide balls are arranged at intervals along the circumference of the mounting portion.

[0008] In an embodiment of the present invention, the inner wall surface of the outer sleeve has a limiting portion extending circumferentially. The number of limiting portions is two and they are arranged at intervals along the length direction of the outer sleeve. The inner diameter of the limiting portion is smaller than the outer diameter of the mounting portion, and the guide member is correspondingly disposed between the two limiting portions.

[0009] In an embodiment of the present invention, the flexible magnetic attractor includes a body portion and a magnetic attractor portion. The body portion extends circumferentially along the outer sleeve and protrudes in a direction away from the central tube. The number of magnetic attractor portions is multiple and they are arranged at intervals along the outer periphery of the body portion.

[0010] In an embodiment of the present invention, the second end of the outer sleeve along the length direction has a sand settling section, and a collection cavity communicating with the conveying channel is formed inside the sand settling section. The collection cavity is used to collect the sand and gravel conveyed from the conveying channel.

[0011] In an embodiment of the present invention, the gas sand anchor suitable for horizontal gas wells further includes an injection pipe for conveying driving fluid, and a reinjection hole is provided on the outer casing. The injection pipe is connected to the conveying channel through the reinjection hole, and the reinjection hole is arranged on the side near the sand settling section.

[0012] In an embodiment of the present invention, the gas sand anchor suitable for horizontal gas wells further includes a flow guide shroud, with the first end of the outer sleeve connected to the flow guide shroud along its length, and an oil outlet connected to the central pipe formed in the middle of the flow guide shroud.

[0013] In an embodiment of the present invention, an oil and gas well device is also proposed, comprising a gas sand anchor suitable for horizontal gas wells as described above.

[0014] Through the above technical solutions, the gas sand anchor and oil and gas well equipment suitable for horizontal gas wells provided by the embodiments of the present invention have the following beneficial effects: The gas sand anchor applicable to horizontal gas wells of this application is installed within the storage space of the wellbore. The gas sand anchor for horizontal gas wells includes an outer casing, a central tube, a flexible magnetic chuck, and a guide. The outer casing extends along the length of the wellbore and has multiple liquid inlets and multiple gas outlets communicating with the storage space. The liquid inlets are used to receive liquid flowing in from the storage space, and the gas outlets are used to discharge gas. The central tube is coaxially nested within the outer casing, and a flow channel for liquid circulation exists between the central tube and the outer casing. A pump is connected to the first end of the central tube, and a collection port communicating with the flow channel is located at the second end. The flexible magnetic chuck is arranged on the outer wall of the outer casing and can adhere to the inner wall of the wellbore. A liquid inlet is located on the side of the flexible magnetic chuck away from the pump, and a gas outlet is located on the other side. The guide members are rotatably and coaxially spaced on the central tube and extend along the length of the outer sleeve. Each guide member has a concave guiding arc surface facing the central tube, which is positioned corresponding to multiple liquid inlets. Liquid within the transport channel is guided to the second end of the central tube via the guiding arc surface, thus improving liquid transport efficiency. Gas within the transport channel is discharged into the storage space via the gas outlet. This application, by providing guide members for guiding liquid flow, ensures that liquid, after entering the transport channel, flows to the second end of the central tube under the guidance of the guide members, thereby improving liquid transport efficiency and solving the technical problem of low liquid inlet efficiency in gas sand anchors applicable to horizontal gas wells in the prior art.

[0015] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the structure of the gas sand anchor applicable to horizontal gas wells according to this application; Figure 2 This is a structural diagram of the guide component mating with the central tube according to this application; Figure 3 An axial cross-sectional view of a gas sand anchor applicable to horizontal gas wells according to this application; Figure 4 A radial cross-sectional view of a gas sand anchor applicable to horizontal gas wells according to this application; Figure 5 This is a structural schematic diagram of the flexible magnetic chuck according to this application.

[0017] Explanation of reference numerals in the attached figures Detailed Implementation

[0018] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0019] The following description, with reference to the accompanying drawings, describes a gas sand anchor and oil and gas well equipment applicable to horizontal gas wells according to this application.

[0020] like Figure 1 , Figure 4 and Figure 5 As shown, in this embodiment, a gas sand anchor suitable for horizontal gas wells is proposed. It is installed within the storage space of the wellbore and includes an outer casing 1, a central tube 2, and a guide member 3. The outer casing 1 extends along the length of the wellbore and has multiple liquid inlets 11 and multiple gas outlets 14 communicating with the storage space. The liquid inlets 11 receive liquid flowing into the storage space, and the gas outlets 14 discharge gas. The central tube 2 is coaxially nested within the outer casing 1, and a flow channel for liquid circulation exists between the central tube 2 and the outer casing 1. A pump is connected to the first end of the central tube 2, and a collection port 21 communicating with the flow channel is opened at the second end. A flexible magnetic member 4 is arranged on the outer wall of the outer casing 1 and can be adsorbed onto the inner wall of the wellbore. The side of the flexible magnetic member 4 facing away from the pump has a liquid inlet 11, and the other side has a gas outlet 14. The guide member 3 is rotatably and coaxially spaced on the central tube 2 and extends along the length of the outer sleeve 1. The guide member 3 has a guide arc surface recessed towards one side of the central tube 2. The guide arc surface is arranged corresponding to the positions of multiple liquid inlets 11. Gas in the conveying channel can be discharged to the storage space through the gas outlet 14, and liquid in the conveying channel can be guided to the second end of the central tube 2 through the guide arc surface to improve the liquid conveying efficiency. Figure 1 As shown, the first end of the central tube 2 is the front end, and the second end of the central tube 2 is the rear end. It should be noted that the artificial lifting device mentioned in the background art is the oil pump used for extracting liquid in this application.

[0021] In this application, a guide 3 for guiding liquid is provided on the gas sand anchor applicable to horizontal gas wells. This ensures that after the liquid enters the delivery channel, it can flow to the second end of the central pipe 2 under the guidance of the guide 3, thereby improving the liquid delivery efficiency and solving the technical problem of low liquid intake efficiency of gas sand anchors applicable to horizontal gas wells in the prior art.

[0022] It should be noted that the storage space of a horizontal gas well contains both gas and liquid. Under horizontal gas well operating conditions, the gas is the product to be collected, while the liquid is extracted simultaneously to prevent excessive downhole liquid from affecting subsequent gas collection. For example... Figure 1As shown, the gas-sand anchor placed in the horizontal wellbore is usually arranged at an angle with the wellbore. The flexible magnetic suction component 4 can divide the storage space into front and rear parts. The gas-liquid two-phase mixture can only enter the delivery channel through the inlet 11. Furthermore, under the action of gravity, the liquid will flow downwards towards the outer casing 1 and block the rear end of the delivery channel, while the gas, flowing downwards, is blocked by the liquid phase blockage and can only enter the front storage space from the outlet 14. This achieves the separation of gas and liquid, increases the ability of liquid to enter the gas-sand anchor, and improves the liquid intake efficiency. With the continuous pumping of the oil pump, the liquid in the delivery channel will gradually be drawn to the surface through the central pipe 2. During the liquid extraction process, the guide component 3 always plays the role of guiding the liquid flow, which can effectively improve the liquid delivery efficiency.

[0023] like Figure 2 As shown, in this embodiment, the guide member 3 includes a guide portion 31, a mounting portion 32, and guide balls 33. A flow-guiding arc surface is formed on the guide portion 31 to guide the liquid and improve the liquid delivery efficiency. The mounting portion 32 has an annular structure and is coaxially spaced around the outer periphery of the central tube 2 to avoid contact between the mounting portion 32 and the outer wall surface of the central tube 2. A mounting portion 32 is connected to each end of the guide portion 31 along its length, resulting in good installation stability. Multiple guide balls 33 are arranged on each mounting portion 32, and these guide balls 33 roll in contact with the inner wall surface of the outer sleeve 1.

[0024] Specifically, in the use of the gas sand anchor suitable for horizontal gas wells, the guide 3 will rotate around the central tube 2 and roll into contact with the inner wall of the outer tube 1. Due to gravity, the guide 31 will always be below the central tube 2 and will not change position with the rotation of the gas sand anchor suitable for horizontal gas wells. Furthermore, the liquid falling back from the gas outlet 14 can also be smoothly transported to the second end of the central tube 2 under the guidance of the guide 31. In addition, in this embodiment, the size of the guide 31 is only one-third of the circumference of the annulus, which has a better effect on guiding the liquid. The size of the guide 31 can be adjusted according to actual needs.

[0025] like Figure 1 and Figure 2 As shown, in this embodiment, multiple liquid inlets 11 are arranged corresponding to the flow guiding arc surface, multiple liquid inlets 11 are set close to the first end of the outer sleeve 1, multiple liquid inlets 11 are arranged at intervals along the circumference of the outer sleeve 1, multiple air outlets 14 are set close to the flexible magnetic suction member 4, and multiple air outlets 14 are arranged at intervals along the circumference of the outer sleeve 1.

[0026] Specifically, in this embodiment, the outer casing 1 is provided with three liquid inlets 11 to ensure that the liquid in the wellbore can fully enter the delivery channel. Similarly, the number of gas outlets 14 is also set to three to ensure that the gas can fully enter the front storage space from the gas outlets 14. The liquid in the delivery channel will be pumped to the surface through the central pipe 2 by the oil pump. Due to the pressure at the bottom of the horizontal gas well, under the action of gas pressure, the gas will carry part of the liquid phase back to the storage space from the gas outlets 14. Since the rear end of the delivery channel is filled with liquid, the gas cannot enter the oil pump through the central pipe 2. The number of liquid inlets 11 and gas outlets 14 can be adjusted according to actual needs to further improve the separation effect of liquid and gas. It should be noted that liquid phase refers to liquid and gas phase refers to gas.

[0027] like Figure 2 As shown, in this embodiment, multiple guide balls 33 are installed on the side of the mounting portion 32 opposite to the guide portion 31. The multiple guide balls 33 are arranged at intervals around the circumference of the mounting portion 32 to ensure that the guide portion 31 and the mounting portion 32 are not easily worn. The multiple guide balls 33 roll in contact with the inner wall surface of the outer sleeve 1 in a point-contact manner, resulting in low friction and smooth rotation. Specifically, the multiple guide balls 33 can contact both the inner wall surface of the outer sleeve 1 and the limiting portion 12. This embodiment can effectively extend the service life of the guide portion 31 and the mounting portion 32.

[0028] like Figure 3 As shown, in this embodiment, the inner wall surface of the outer sleeve 1 has a limiting part 12 extending in the circumferential direction. There are two limiting parts 12, which are arranged at intervals along the length direction of the outer sleeve 1. The inner diameter of the limiting part 12 is smaller than the outer diameter of the mounting part 32. The guide member 3 is correspondingly disposed between the two limiting parts 12.

[0029] In this embodiment, the distance between the two limiting parts 12 is set to be just the length for placing the guide 3, so as to prevent the guide 3 from moving along the front and back direction of the outer tube 1. Of course, a certain margin can also be left according to actual needs to allow the guide 3 to move along the front and back direction of the outer tube 1.

[0030] like Figure 1 , Figure 4 and Figure 5As shown, in this embodiment, the flexible magnetic chuck 4 includes a body portion 41 and magnetic chuck portions 42. The body portion 41 extends circumferentially along the outer sleeve 1 and protrudes in a direction away from the central tube 2. Multiple magnetic chuck portions 42 are arranged at intervals along the outer periphery of the body portion 41 to ensure that the flexible magnetic chuck 4 can stably adhere to the inner wall of the wellbore. The body portion 41 is made of a flexible material with a certain strength to ensure it has a certain deformation capacity, better conforming to the inner wall of the wellbore and ensuring that the gas sand anchor suitable for horizontal gas wells is not easily jammed against the inner wall of the wellbore when lowered into the wellbore. Furthermore, the outer sleeve 1 where the flexible magnetic chuck 4 is located needs to be demagnetized to prevent the magnetic chuck portions 42 from adhering to the outer wall of the outer sleeve 1, thus affecting the adsorption effect of the magnetic chuck portions 42 on the inner wall of the wellbore. The number of magnetic chuck portions 42 can be set according to actual needs.

[0031] In this embodiment, the gas sand anchor suitable for horizontal gas wells also includes a flow guide shroud. The first end of the outer casing 1 along its length is connected to the flow guide shroud, and an oil outlet is formed in the middle of the flow guide shroud, communicating with the central pipe 2. Liquid in the central pipe 2 can be drawn from the oil outlet to the surface. The flow guide shroud in this embodiment can effectively block the front end of the delivery channel, preventing the delivery channel from communicating with the oil pump.

[0032] The outer casing 1 has a sedimentation section at its second end along its length, meaning the rear end of the outer casing 1 has a sedimentation section. Under gravity, sand and gravel in the liquid will settle at the bottom of the rear end of the sedimentation section, thus preventing sand and gravel from clogging the conveying channel. The sedimentation section contains a collection chamber that communicates with the conveying channel, used to collect the sand and gravel conveyed from the conveying channel. Furthermore, the sedimentation section is detachably connected to the outer casing 1; by removing the sedimentation section, the collected sand and gravel can be easily cleaned away, making disassembly and assembly convenient.

[0033] like Figure 1 As shown, in this embodiment, the gas sand anchor suitable for horizontal gas wells also includes an injection pipe for conveying driving fluid. The outer casing 1 is provided with a reinjection hole 13. The injection pipe is connected to the conveying channel through the reinjection hole 13. The reinjection hole 13 is arranged on the side near the sand settling section.

[0034] When the liquid volume in the storage space is low, the liquid on the ground can be directly injected into the delivery channel through the injection pipe. This ensures that the liquid phase inflow rate in the delivery channel matches the pumping capacity of the oil pump, meets the minimum flow rate requirement for the oil pump to extract liquid, and avoids the situation where the oil pump experiences gas intrusion and dry running due to the pumping capacity being greater than the liquid supply from the well. This would easily shorten the service life of the oil pump.

[0035] In this embodiment, an oil and gas well apparatus is also proposed, including a gas sand anchor suitable for horizontal gas wells as described above. Since the oil and gas well apparatus adopts all embodiments of the gas sand anchor suitable for horizontal gas wells in this application, it also has all the beneficial effects of the gas sand anchor suitable for horizontal gas wells, which will not be described in detail here.

[0036] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A gas sand anchor suitable for horizontal gas wells, installed within the storage space of the wellbore, characterized in that, The gas sand anchor suitable for horizontal gas wells includes: The outer casing (1) extends along the length of the wellbore. The outer casing (1) is provided with multiple liquid inlets (11) and multiple air outlets (14) that communicate with the storage space. The liquid inlets (11) are used to receive liquid flowing in from the storage space, and the air outlets (14) are used to discharge gas. The central tube (2) is coaxially nested inside the outer tube (1). There is a conveying channel for liquid flow between the central tube (2) and the outer tube (1). The first end of the central tube (2) is connected to an oil pump, and the second end is provided with a liquid collection port (21) that communicates with the conveying channel. A flexible magnetic suction element (4) is arranged on the outer wall of the outer sleeve (1) and can be adsorbed on the inner wall of the well barrel. The inlet (11) is arranged on the side of the flexible magnetic suction element (4) away from the oil pump, and the outlet (14) is arranged on the other side. The guide (3) is rotatably and coaxially spaced on the central tube (2) and extends along the length of the outer tube (1). The guide (3) has a flow-guiding arc surface recessed towards the side of the central tube (2). The flow-guiding arc surface is arranged corresponding to the positions of multiple liquid inlets (11). The liquid in the conveying channel can be guided to the second end of the central tube (2) through the flow-guiding arc surface. The gas in the conveying channel can be discharged to the storage space through the gas outlet (14).

2. The gas sand anchor suitable for horizontal gas wells according to claim 1, characterized in that, The guide component (3) includes a guide part (31), a mounting part (32) and guide balls (33). The guide part (31) forms the flow-guiding arc surface. The mounting part (32) is an annular structure and is coaxially spaced around the outer periphery of the central tube (2). The guide part (31) is connected to a mounting part (32) at both ends along the length direction. There are multiple guide balls (33). Multiple guide balls (33) are arranged on each mounting part (32). Multiple guide balls (33) are in rolling contact with the inner wall surface of the outer tube (1).

3. The gas sand anchor suitable for horizontal gas wells according to claim 1, characterized in that, The multiple liquid inlets (11) are arranged corresponding to the flow guiding arc surface. The multiple liquid inlets (11) are located near the first end of the outer tube (1). The multiple liquid inlets (11) are arranged at intervals along the circumference of the outer tube (1). The multiple air outlets (14) are located near the flexible magnetic suction element (4). The multiple air outlets (14) are arranged at intervals along the circumference of the outer tube (1).

4. The gas sand anchor suitable for horizontal gas wells according to claim 2, characterized in that, Multiple guide balls (33) are installed on the side of the mounting part (32) away from the guide part (31), and the multiple guide balls (33) are arranged at intervals around the mounting part (32).

5. The gas sand anchor suitable for horizontal gas wells according to claim 2, characterized in that, The inner wall surface of the outer tube (1) has a limiting part (12) extending in the circumferential direction. There are two limiting parts (12) and they are arranged at intervals along the length direction of the outer tube (1). The inner diameter of the limiting part (12) is smaller than the outer diameter of the mounting part (32). The guide (3) is correspondingly disposed between the two limiting parts (12).

6. A gas sand anchor suitable for horizontal gas wells according to any one of claims 1 to 5, characterized in that, The flexible magnetic attractor (4) includes a body part (41) and magnetic attractor parts (42). The body part (41) extends circumferentially along the outer tube (1) and protrudes in a direction away from the central tube (2). The number of magnetic attractor parts (42) is multiple and they are arranged at intervals along the outer periphery of the body part (41).

7. The gas sand anchor suitable for horizontal gas wells according to any one of claims 1 to 5, characterized in that, The outer sleeve (1) has a sand settling section at its second end along the length direction. The sand settling section has a collection cavity that communicates with the conveying channel. The collection cavity is used to collect sand and gravel conveyed from the conveying channel.

8. The gas sand anchor suitable for horizontal gas wells according to claim 7, characterized in that, The gas sand anchor suitable for horizontal gas wells also includes an injection pipe for conveying driving fluid. The outer casing (1) is provided with a reinjection hole (13). The injection pipe is connected to the conveying channel through the reinjection hole (13). The reinjection hole (13) is arranged on the side close to the sand settling section.

9. A gas sand anchor suitable for horizontal gas wells according to any one of claims 1 to 5, characterized in that, The gas sand anchor applicable to horizontal gas wells also includes a flow guide shroud. The first end of the outer casing (1) along the length direction is connected to the flow guide shroud, and an oil outlet is formed in the middle of the flow guide shroud that communicates with the central pipe (2).

10. An oil and gas well equipment, characterized in that, Includes a gas sand anchor suitable for horizontal gas wells according to any one of claims 1 to 9.

Images