Sand and gas proof sand anchor for oil production in a well

Abstract

The utility model discloses a kind of sand and gas sand anchor for oil extraction in pit, including sand removal pipe, gas-liquid separation pipe is provided on the upper end of sand removal pipe, sand removal spiral shaft is provided in sand removal pipe, the lower end of sand removal spiral shaft circumferential side is opened with multiple through holes, rotating pipe is rotatably connected with the lower end of sand removal pipe, sand removal spiral shaft lower side left and right symmetrical two sand discharge holes are opened, sand removal spiral shaft lower side is rotatably connected with seal seat, two arc holes are opened left and right symmetrical in seal seat, connecting column is connected between seal seat and rotating pipe, the outer surface side of rotating pipe is left and right symmetrical with two groups of limiting components that make rotating pipe unable to rotate;Gas-liquid separation component is provided in gas-liquid separation pipe;The utility model has the advantage that sand and gravel in sand removal spiral shaft are quickly discharged, avoid the problem that through hole is blocked by sand, to ensure that sand removal spiral shaft is reliably operated for a long time.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil production equipment and relates to a sand-proof and gas-proof anchor for downhole oil production. Background Technology

[0002] During oil and gas field pumping, gas lock and sand blockage often occur due to gas and sand particles in the oil, leading to oil well failure and production shutdown. To address the adverse effects of gas and sand on the pumping unit, gas anchors and sand anchors are commonly used. In practice, gas anchors and sand anchors are connected in series below the pumping unit for oil-gas separation and sand filtering, ensuring normal well production to a certain extent. However, for oil with high oil-gas ratios and fine sand particles, the gravity separation technology of gas anchors and the sand filtering technology of sand anchors are no longer sufficient to meet the requirements for gas and sand control. Furthermore, the separate installation and use of gas and sand anchors is inconvenient for installation and maintenance.

[0003] Chinese utility model patent CN220319540U discloses a sand-proof and gas-proof anchor. It includes an outer pipe, within which is an inner pipe assembly. The inner pipe assembly includes a lower inner pipe located below the outer pipe. A sand-removing spiral shaft is concentrically arranged within the lower inner pipe, with a connecting sleeve penetrating its upper end. The spiral shaft has a through hole and multiple inlet holes communicating with the through hole at its lower part. Well fluid enters the lower inner pipe through the outer and inner holes and spirals downwards. A degassing spiral shaft is concentrically fixed within an upper inner pipe. A valve cover is fixed to the upper end of the upper inner pipe, and a valve body is fixed to the upper end of the valve cover. A valve ball that mates with the valve body is placed inside the valve body. A gas collecting cover is fixedly connected to the lower end of the valve body, and an exhaust pipe communicating with its interior is fixed to the upper end of the valve body. Multiple elongated holes are formed on the valve cover. This design improves sand separation, ensures well fluid flow velocity, thereby reducing the workload of the pumping unit and lowering oil production costs.

[0004] When the above technical solution is used, the sand and gravel may enter the sand removal spiral shaft through the through hole on the sand removal spiral shaft and accumulate at the bottom of the sand removal spiral shaft. When too much sand and gravel accumulates in the sand removal spiral shaft, it may block the through hole, affecting the normal use of the sand removal spiral shaft, and thus affecting the normal use of the air sand anchor. Utility Model Content

[0005] In response to the problem that gravel enters the desanding spiral shaft through the through-hole and accumulates at the bottom of the shaft, potentially clogging the through-hole, this invention proposes a sand and gas anchor for downhole oil production. This effectively solves the problem in the prior art where gravel enters the desanding spiral shaft through the through-hole and accumulates at the bottom, potentially clogging the through-hole.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A sand-proof and gas-proof anchor for downhole oil production includes a sand-removing pipe. Multiple liquid inlet holes are annularly opened at the upper end of the circumferential side of the sand-removing pipe. A gas-liquid separation pipe is installed at the upper end of the sand-removing pipe. A sand-removing spiral shaft is installed inside the sand-removing pipe. The upper end of the sand-removing spiral shaft is connected to the gas-liquid separation pipe. Multiple through holes are opened at the lower end of the circumferential side of the sand-removing spiral shaft. A rotating pipe is rotatably and sealingly connected to the lower end of the sand-removing pipe. Two sand discharge holes are symmetrically opened on the lower side of the sand-removing spiral shaft. A sealing seat is rotatably connected to the lower side of the sand-removing spiral shaft. Two arc-shaped holes of the same size and shape as the sand discharge holes are symmetrically opened on the left and right sides of the sealing seat. The sealing seat can rotate to close the sand discharge holes. A connecting column is provided between the sealing seat and the rotating pipe. Two sets of limiting components that prevent the rotating pipe from rotating are symmetrically arranged on the outer side of the rotating pipe. The gas-liquid separation pipe is equipped with a gas-liquid separation component.

[0007] Furthermore, the gas-liquid separation assembly includes a gas-liquid separation spiral shaft disposed inside the gas-liquid separation tube and a one-way valve, wherein the one-way valve is located on the upper side of the gas-liquid separation spiral shaft.

[0008] Furthermore, the one-way valve includes a valve body, which has multiple oil inlets arranged in a circular array running vertically. The oil inlets are located on the side of the valve body away from the center. The valve body has two vent holes symmetrically arranged on the left and right sides that communicate with the outside. The valve body has an air inlet at the center of its lower side that communicates with the vent holes. The valve body is equipped with a valve ball that can close the air inlet. The oil inlets and vent holes are not connected.

[0009] Furthermore, the limiting component includes a limiting block that is slidably connected to the outer side of the rotating tube. A guide post is provided inside the rotating tube. The limiting block is sleeved on the guide post. A spring is sleeved on the guide post. The upper end of the spring abuts against the lower side of the limiting block. A limiting groove is provided on the outer side of the sand removal tube. The limiting block can be inserted into the limiting groove under the action of the spring.

[0010] Furthermore, a conical guide seat is provided on the lower side of the inner cavity of the sand removal spiral shaft, and the lower side of the guide seat is consistent with the inner diameter of the sand discharge hole.

[0011] Furthermore, the outer side of the sand removal pipe is provided with a sand-proof mesh located outside the liquid inlet.

[0012] Furthermore, an intermediate coupling is provided at the connection between the sand removal pipe and the gas-liquid separation pipe, a lower coupling is provided on the lower side of the rotating pipe, and an upper coupling is provided on the upper side of the gas-liquid separation pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (2) This utility model achieves internal sand discharge of the sand removal spiral shaft by cooperating with the rotating tube, the sealing seat and the guide seat, thus avoiding the problem of sand clogging the through hole and ensuring the long-term reliable operation of the sand removal spiral shaft; (3) This utility model realizes gas-liquid separation of well fluid through gas-liquid separation pipe and gas-liquid separation component, reduces the risk of gas lock, and improves the continuous and stable working ability of oil pump; (4) This utility model improves the convenience of on-site disassembly, maintenance or replacement of parts by means of a modular connection design of the middle coupling, the upper coupling and the lower coupling, and reduces maintenance costs and well downtime. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of part A; Figure 3 This is a schematic diagram of the bottom structure of the sand removal spiral shaft of this utility model; Figure 4 This is a schematic diagram of the one-way valve of this utility model; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 6 This is a structural schematic diagram of Embodiment 3 of the present invention; In the diagram: 1. Sand removal pipe; 101. Liquid inlet; 2. Gas-liquid separation pipe; 3. Sand removal spiral shaft; 4. Gas-liquid separation spiral shaft; 5. One-way valve; 501. Valve body; 502. Valve ball; 503. Vent; 504. Oil inlet; 6. Upper coupling; 7. Lower coupling; 8. Rotary pipe; 9. Sealing seat; 10. Flow guide seat; 11. Limiting block; 12. Guide column; 13. Spring; 14. Sand discharge hole; 15. Rotary sealing joint; 16. Intermediate coupling; 17. Sandproof mesh. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0016] like Figures 1 to 4As shown, a sand and gas prevention anchor for downhole oil production includes a sand removal pipe 1. The upper end of the sand removal pipe 1 has multiple annular inlet holes 101. A gas-liquid separation pipe 2 is installed at the upper end of the sand removal pipe 1. A sand removal spiral shaft 3 is installed inside the sand removal pipe 1, and its upper end is connected to the gas-liquid separation pipe 2. Multiple through holes are opened at the lower end of the sand removal spiral shaft 3. A rotating pipe 8 is rotatably and sealingly connected to the lower end of the sand removal pipe 1. Two sand discharge holes 14 are symmetrically opened on the lower side of the sand removal spiral shaft 3. A sealing seat 9 is rotatably connected to the lower side of the sand removal spiral shaft 3. Two arc-shaped holes of the same size and position as the sand discharge holes 14 are symmetrically opened on the left and right inside the sealing seat 9. The sealing seat 9 can rotate to close the sand discharge holes 14. A connecting column is provided between the sealing seat 9 and the rotating pipe 8. Two sets of limiting components that prevent the rotating pipe 8 from rotating are symmetrically arranged on the outer side of the rotating pipe 8. A gas-liquid separation component is installed inside the gas-liquid separation pipe 2.

[0017] In this embodiment, the gas-liquid separation assembly includes a gas-liquid separation spiral shaft 4 disposed in the gas-liquid separation pipe 2 and a one-way valve 5, wherein the one-way valve 5 is located on the upper side of the gas-liquid separation spiral shaft 4.

[0018] In this embodiment, the one-way valve 5 includes a valve body 501. The valve body 501 has multiple oil inlets 504 arranged in a circular array. The oil inlets 504 are located on the side of the valve body 501 away from the center. The valve body 501 has two vent holes 503 symmetrically arranged inside, which communicate with the outside. The valve body 501 has an air inlet at the center of its lower side that communicates with the vent holes 503. The valve body 501 has a valve ball 502 that can close the air inlet. The oil inlets 504 and the vent holes 503 are not connected.

[0019] In this embodiment, the limiting component includes a limiting block 11 that is slidably connected to the outer side of the rotating tube 8. A guide post 12 is provided inside the rotating tube 8. The limiting block 11 is sleeved on the guide post 12. A spring 13 is sleeved on the guide post 12. The upper end of the spring 13 abuts against the lower side of the limiting block 11. A limiting groove is provided on the outer side of the sand removal tube 1. The limiting block 11 can be inserted into the limiting groove under the action of the spring 13.

[0020] In this embodiment, a conical guide seat 10 is provided on the lower side of the inner cavity of the sand removal spiral shaft 3, and the lower side of the guide seat 10 is consistent with the inner diameter of the sand discharge hole 14.

[0021] In this embodiment, a sand-proof mesh 17 located outside the liquid inlet 101 is provided on the outer side of the sand removal pipe 1.

[0022] In this embodiment, an intermediate coupling 16 is provided at the connection between the sand removal pipe 1 and the gas-liquid separation pipe 2, a lower coupling 7 is provided on the lower side of the rotating pipe 8, and an upper coupling 6 is provided on the upper side of the gas-liquid separation pipe 2.

[0023] During installation of the above embodiments: When going down into the well, connect the sand discharge pipe at point 7 of the lower coupling and attach a threaded plug to the lower end of the sand discharge pipe for sand settling. When installing the tubular pump, connect the upper coupling 6 to the lower end of the fixed valve assembly of the pump through the oil pipe short section; When installing the rod pump, connect the upper coupling 6 to the lower end of the oil pipe inside the rod pump.

[0024] When using the above embodiments: In the upper stroke type of the oil pump, the well fluid enters the desanding pipe 1 through the inlet hole 101. When the well fluid passes through the inlet hole 101, the sand screen 17 can block large sand particles in the well fluid to the outside of the desanding pipe 1. The well fluid entering the desanding pipe 1 flows downward along the desanding spiral shaft 3 under the action of gravity. Under the action of centrifugal force, the sand particles in the well fluid are located on the outside of the desanding spiral shaft 3 and fall into the external sand discharge pipe after the spiral descends. The liquid is located on the inside of the desanding spiral shaft 3 and enters the desanding spiral shaft 3 through the through hole after the spiral descends, and then rises into the gas-liquid separation pipe 2. When the well fluid enters the gas-liquid separator 2, it spirals upward along the spiral blades of the gas-liquid separator spiral shaft 4. As the well fluid spirals upward, under the action of centrifugal force, the liquid in the well fluid and the outer edge of the spiral blades fixed near the gas-liquid separator spiral shaft 4 spiral upward, while the gas in the well fluid spirals upward at the inner edge of the spiral blades of the separator spiral shaft. After reaching the top of the gas-liquid separator spiral shaft 4, the liquid in the well fluid and the gas fixed in the well fluid are discharged through the oil delivery hole 504 on the one-way valve 5, while the gas in the well fluid enters the interior of the one-way valve 5 and is discharged from the gas hole inside the one-way valve 5, thereby achieving gas-liquid separation of the well fluid.

[0025] When excessive sand and gravel accumulate inside the desanding spiral shaft 3, the operator pushes the limiting block 11 downwards to disengage it from the limiting groove. Subsequently, the operator rotates the sealing seat 9 via the rotating tube 8, connecting the arc-shaped hole on the sealing seat 9 with the sand discharge hole 14. Under the action of the guide seat 10, the sand and gravel inside the desanding spiral shaft 3 slides down the guide seat 10 and is discharged through the sand discharge hole 14 and the arc-shaped hole, ensuring the reliability of the desanding spiral shaft 3 during use. After the sand discharge is completed, the operator rotates the rotating tube 8 in the opposite direction to the origin. Under the action of the spring 13, the limiting block 11 is inserted into the limiting groove, preventing the rotating tube 8 from rotating when not in use, further improving the reliability and practicality of the device during use.

[0026] Example 2 differs from Example 1 in that: like Figure 5 As shown, in this embodiment, a rotating sealing joint 15 is provided between the sand removal pipe 1 and the rotating pipe 8, and the rotating sealing joint 15 has a locking function so that the rotating sealing joint 15 cannot be rotated when not in use. The rotary sealing joint 15 in this embodiment improves the convenience for workers when installing the device. At the same time, the rotary sealing joint 15 can be purchased directly, further improving the convenience of subsequent maintenance.

[0027] Example 3 differs from Example 1 in that: like Figure 6 As shown, in this embodiment, there are multiple gas-liquid separation pipes 2, which are connected in series with each other by intermediate couplings 16, enabling the operator to achieve multi-stage gas-liquid separation according to the actual situation, thereby further improving the gas-liquid separation effect of the device.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sand and gas prevention anchor for downhole oil production, comprising a sand removal pipe (1), wherein the upper end of the circumferential side of the sand removal pipe (1) is provided with a plurality of liquid inlet holes (101) in an annular shape, and a gas-liquid separation pipe (2) is provided at the upper end of the sand removal pipe (1), characterized in that: The sand removal pipe (1) is provided with a sand removal spiral shaft (3). The upper end of the sand removal spiral shaft (3) is connected to the gas-liquid separation pipe (2). The lower end of the circumferential side of the sand removal spiral shaft (3) is provided with multiple through holes. The lower end of the sand removal pipe (1) is rotatably sealed with a rotating pipe (8). The lower side of the sand removal spiral shaft (3) is symmetrically provided with two sand discharge holes (14). The lower side of the sand removal spiral shaft (3) is rotatably connected with a sealing seat (9). The sealing seat (9) is symmetrically provided with two arc-shaped holes with the same position, size and shape as the sand discharge holes (14). The sealing seat (9) can rotate to close the sand discharge holes (14). A connecting column is provided between the sealing seat (9) and the rotating pipe (8). The outer side of the rotating pipe (8) is symmetrically provided with two sets of limiting components that prevent the rotating pipe (8) from rotating. The gas-liquid separation pipe (2) is equipped with a gas-liquid separation component.

2. The sand and gas prevention anchor for downhole oil production according to claim 1, characterized in that: The gas-liquid separation assembly includes a gas-liquid separation spiral shaft (4) disposed in a gas-liquid separation tube (2) and a one-way valve (5), wherein the one-way valve (5) is located on the upper side of the gas-liquid separation spiral shaft (4).

3. A sand-proof and gas-proof anchor for downhole oil production according to claim 2, characterized in that: The one-way valve (5) includes a valve body (501). The valve body (501) has multiple oil supply holes (504) arranged in a ring array. The oil supply holes (504) are located on the side of the valve body (501) away from the center. The valve body (501) has two vent holes (503) symmetrically arranged on the left and right sides that communicate with the outside. The valve body (501) has an air inlet hole at the center of the lower side that communicates with the vent holes (503). The valve body (501) is provided with a valve ball (502) that can close the air inlet hole. The oil supply holes (504) and the vent holes (503) are not connected.

4. A sand-proof and gas-proof anchor for downhole oil production according to claim 1, characterized in that: The limiting component includes a limiting block (11) that is slidably connected to the outer side of the rotating tube (8). A guide post (12) is provided inside the rotating tube (8). The limiting block (11) is sleeved on the guide post (12). A spring (13) is sleeved on the guide post (12). The upper end of the spring (13) abuts against the lower side of the limiting block (11). A limiting groove is provided on the outer side of the sand removal tube (1). The limiting block (11) can be inserted into the limiting groove under the action of the spring (13).

5. A sand-proof and gas-proof anchor for downhole oil production according to claim 1, characterized in that: The lower side of the inner cavity of the sand removal spiral shaft (3) is provided with a conical guide seat (10), and the lower side of the guide seat (10) is consistent with the inner diameter of the sand discharge hole (14).

6. A sand-proof and gas-proof anchor for downhole oil production according to claim 1, characterized in that: The outer side of the sand removal pipe (1) is provided with a sand-proof mesh (17) located outside the liquid inlet (101).

7. A sand-proof and gas-proof anchor for downhole oil production according to claim 1, characterized in that: A middle coupling (16) is provided at the connection between the sand removal pipe (1) and the gas-liquid separation pipe (2), a lower coupling (7) is provided on the lower side of the rotating pipe (8), and an upper coupling (6) is provided on the upper side of the gas-liquid separation pipe (2).

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