Underground sand removal and plug removal backwashing device for oil-water well

Abstract

The utility model relates to the technical field of backwashing devices for oil fields and oil wells, in particular to an underground sand removal and plug removal backwashing device for an oil-water well. The oil-water well underground sand removal and plug removal backwashing device comprises a mounting seat, the mounting seat is mounted on a flow guide pipe in the backwashing device, a movably connected sealing cover is arranged at the top of the mounting seat, and an adapter for supporting the sealing cover is arranged at the top of the mounting seat; a plurality of guide rods which are annularly distributed are arranged at the top of the adapter base, the guide rods are sleeved with an adapter plate which is in sliding connection with the guide rods, and an extension spring is erected between the adapter plate and the adapter base. According to the oil-water well underground sand cleaning and plug removing backwashing device, when backwashing operation is completed and the sealing cover falls down through the gravity of the sealing cover, the sealing effect of the sealing cover on the top of the cleaning pipe can be more excellent under the application of multiple acting forces, namely the pulling force of the extension spring on the sealing cover, the suction force of the annular magnetic block on the switching disc below the sealing cover and the application of multiple acting forces.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field oil well backwashing devices, in particular to an underground sand cleaning and plugging-removing backwashing device for an oil-water well. Background Art

[0002] Some oil and water wells in oil fields are prone to spitting sand into the wellbore due to loose formation cementation, resulting in sand burying the downhole tubing and production and injection layers, causing the oil and water wells to be inefficient or even shut down and fail. In severe cases, the reservoir pressure drops, causing oil well production to decrease.

[0003] In order to ensure the normal production of oil and water wells, it is necessary to backwash the oil and water wells to remove sand burials and restore the function of the oil and water well pipe string and the oil reservoir production capacity. In the patent document with publication number CN105804678B, backwashing is performed by using a hydraulically driven impeller to drive the spiral blades to stir the sand and scale, hydraulically siphon the sand, and the sand and scale are discharged from the oil well along the oil pipe with the water flow. When the backwashing is completed, the top cover at the top of the cleaning pipe slowly falls down due to the action of gravity to close the cleaning pipe. When the top cover falling due to gravity hits the top of the cleaning pipe, it is easy to cause a poor seal due to insufficient extrusion force.

[0004] In order to solve the above problems, it is necessary to improve the connection structure between the top cover and the cleaning pipe based on the structure with publication number CN105804678B to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an underground sand cleaning, plugging removal and backwashing device for an oil-water well.

[0006] The utility model provides an underground sand cleaning and plugging-removing backwashing device for oil and water wells, comprising: a mounting seat, the mounting seat being mounted on a flow guide pipe in the backwashing device, and a movably connected sealing cover being provided on the top of the mounting seat, and a transfer seat for supporting the sealing cover being provided on the top of the mounting seat;

[0007] A plurality of annularly distributed guide rods are arranged on the top of the adapter seat, and an adapter disk with the same sliding connection is sleeved on the outer side of the plurality of guide rods. A tension spring is arranged between the adapter disk and the adapter seat, and the sealing cover is located above the connection disk.

[0008] Preferably, a fixedly connected extrusion spring is provided at the inner top of the mounting seat, a fixedly connected extrusion disk is provided at the bottom end of the extrusion spring, and an arc-shaped groove is provided at the bottom of the extrusion disk.

[0009] Preferably, a fixedly connected annular magnetic block is sleeved on the outside of the guide rod, and the top of the annular magnetic block and the bottom of the adapter plate are adsorbed to each other.

[0010] Preferably, a through hole is provided inside the adapter plate at a position opposite to the guide rod, and an inner wall of the through hole abuts against and is slidably connected to an outer wall of the guide rod.

[0011] Preferably, a threaded limiting cap is sleeved on the top end of the guide rod, and a diameter specification of the limiting cap is larger than a diameter specification of the through hole.

[0012] Preferably, a plurality of annularly distributed protruding rods are provided on the top of the adapter plate, and a sealing ring fixedly connected to the top of the plurality of protruding rods is provided, and the top of the sealing ring is fixedly connected to the bottom of the sealing cover.

[0013] Preferably, one end of the tension spring is fixedly connected to the adapter plate, and the other end of the tension spring is fixedly connected to the adapter seat.

[0014] Compared with the related art, the downhole sand cleaning and plugging-removing backwashing device for oil and water wells provided by the utility model has the following beneficial effects:

[0015] 1. The utility model sets up a tension spring and an annular magnetic block between the sealing cover and the mounting seat. When the backwashing operation is completed and the sealing cover falls by its own gravity, the tension of the tension spring on the sealing cover and the suction of the annular magnetic block on the adapter plate below the sealing cover can make the sealing effect of the sealing cover on the top of the cleaning pipe more outstanding under the application of multiple forces.

[0016] 2. The utility model arranges a squeeze disk at the bottom of the squeeze spring, and opens an arc groove at the bottom of the squeeze disk that is the same as the arc surface of the steel ball. When the squeeze spring drives the squeeze disk to move downward to squeeze the steel ball, the squeeze disk can fit the surface of the steel ball more precisely, so that the force of the squeeze spring can act more comprehensively on the steel ball, thereby improving the sealing effect of the steel ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model provides a structural schematic diagram of a preferred embodiment of an underground sand cleaning, plugging removal and backwashing device for oil and water wells;

[0018] Figure 2 for Figure 1 The schematic diagram of the structure of the adapter, adapter plate and sealing cover shown;

[0019] Figure 3 for Figure 2 A schematic diagram of the structure of the adapter and its components shown;

[0020] Figure 4 for Figure 2 A schematic diagram of the structure of the sealing cover and its components shown;

[0021] Figure 5 for Figure 1A schematic diagram of a partial cross-sectional structure of the mounting seat shown;

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure of the utility model after installation.

[0023] Numbers in the figure: 1, mounting seat; 11, extrusion spring; 12, extrusion plate; 13, arc groove; 2, adapter seat; 21, tension spring; 22, guide rod; 221, annular magnetic block; 222, limiting cap; 3, adapter plate; 31, through hole; 32, protruding rod; 4, sealing cover; 41, sealing ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0026] See also Figures 1 to 6 The utility model provides an underground sand cleaning and plugging-removing backwashing device for oil and water wells. The underground sand cleaning and plugging-removing backwashing device for oil and water wells comprises: a mounting seat 1, which is mounted on a guide pipe in the backwashing device with publication number CN105804678B, and a movably connected sealing cover 4 is provided on the top of the mounting seat 1, and the sealing cover 4 is located outside the liquid discharge port at the top end of the cleaning pipe in the backwashing device.

[0027] In the embodiments of the present invention, please refer to Figure 1 and Figure 6 A transfer seat 2 for supporting the sealing cover 4 is provided at the top of the mounting seat 1, and a plurality of annularly distributed guide rods 22 are provided at the top of the transfer seat 2. The outer parts of the plurality of guide rods 22 are sleeved with a transfer disk 3 with the same sliding connection. A tension spring 21 is arranged between the transfer disk 3 and the transfer seat 2, and the sealing cover 4 is located above the connection disk. One end of the tension spring 21 is fixedly connected to the transfer disk 3, and the other end of the tension spring 21 is fixedly connected to the transfer seat 2. A fixedly connected annular magnetic block 221 is sleeved on the outer part of the guide rod 22, and the top of the annular magnetic block 221 and the bottom of the transfer disk 3 are adsorbed to each other.

[0028] It should be noted that: when in use, when water flows out of the guide hole in the publication number CN105804678B and impacts the guide vane, the cleaning pipe rotates counterclockwise, driving the spiral vane to stir the sand and scale accumulated in the outer annulus, and driven by the water flow that partially passes through the outlet hole, it is discharged upward along the flow channel. In addition, after most of the water flows impacting the guide vane, the two top covers are flushed open, and the flow channels such as the upper oil pipe are flowed upward to flush. When the backwash well is finished, the water body stops flowing;

[0029] At this time, the tension spring 21 located between the transfer plate 3 and the transfer seat 2 will pull the transfer plate 3 through its own force, so that the sealing cover 4 can be driven to move downward through the transfer plate 3;

[0030] When the bottom of the adapter plate 3 abuts against the top of the annular magnetic block 221, the adsorption force between the annular magnetic block 221 and the adapter plate 3 will cause the sealing cover 4 to abut against the top of the cleaning tube, thereby improving the firmness of the installation of the sealing cover 4. By applying a driving force other than gravity to the sealing cover 4, the sealing effect of the sealing cover 4 on the drain port at the top of the cleaning tube can be further improved.

[0031] In the embodiments of the present invention, please refer to Figure 1 and Figure 6 A fixedly connected extrusion spring 11 is provided at the inner top of the mounting seat 1 , a fixedly connected extrusion disk 12 is provided at the bottom end of the extrusion spring 11 , and an arc groove 13 is provided at the bottom of the extrusion disk 12 .

[0032] It should be noted that the curvature specification of the arc groove 13 is the same as the arc shape of the outer wall of the steel ball in the publication number CN105804678B. After the backwash operation is completed, when the extrusion spring 11 drives the extrusion plate 12 to move downward to squeeze the steel ball, the extrusion plate 12 can fit more precisely with the surface of the steel ball, so that the force of the extrusion spring 11 can act more comprehensively on the steel ball, thereby improving the sealing effect of the steel ball.

[0033] In the embodiments of the present invention, please refer to Figure 1 and Figure 6 A through hole 31 is provided inside the adapter plate 3 at a position opposite to the guide rod 22, and the inner wall of the through hole 31 abuts against and is slidably connected to the outer wall of the guide rod 22. A threaded limit cap 222 is sleeved on the top end of the guide rod 22, and the diameter of the limit cap 222 is larger than the diameter of the through hole 31.

[0034] It should be noted that: by opening the through hole 31, the sealing cover 4 can drive the adapter plate 3 to stably slide on the outer wall of the guide rod 22 when the driving force is applied, so that the center of the sealing cover 4 and the center of the top of the cleaning tube in the publication number CN105804678B are always on the same vertical line, and the sealing cover 4 that is reset later can accurately seal;

[0035] At the same time, by providing the relatively large limiting cap 222 , when the sealing cover 4 is driven by the driving force to drive the adapter plate 3 to move outward, the protruding limiting cap 222 can prevent the adapter plate 3 from falling off the guide rod 22 .

[0036] In the embodiments of the present invention, please refer to Figure 1 and Figure 6 The top of the adapter plate 3 is provided with a plurality of annularly distributed protruding rods 32 , and the tops of the plurality of protruding rods 32 are provided with a sealing ring 41 which is fixedly connected thereto, and the top of the sealing ring 41 is fixedly connected to the bottom of the sealing cover 4 .

[0037] It should be noted that the outer wall of the sealing ring 41 abuts against the inner wall of the drainage port at the top of the cleaning tube in publication number CN105804678B, and when the bottom of the sealing cover 4 abuts against the top of the cleaning tube, the sealing ring 41 inserted into the drainage port can perform secondary sealing on the cleaning tube, thereby helping to improve the sealing effect of the sealing cover 4.

[0038] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A downhole sand cleaning and plugging removal backwashing device for oil and water wells, comprising: A mounting seat (1), the mounting seat (1) being mounted on a guide pipe in a backwash device, and a movably connected sealing cover (4) being provided on the top of the mounting seat (1), characterized in that a transfer seat (2) for supporting the sealing cover (4) is provided on the top of the mounting seat (1); A plurality of guide rods (22) distributed in an annular pattern are provided on the top of the adapter seat (2); an adapter plate (3) connected in a sliding manner is sleeved on the outer portion of the plurality of guide rods (22); a tension spring (21) is arranged between the adapter plate (3) and the adapter seat (2); and the sealing cover (4) is located above the connection plate.

2. The downhole sand cleaning and plugging-removing backwashing device for oil and water wells according to claim 1 is characterized in that: A fixedly connected extrusion spring (11) is provided at the inner top of the mounting seat (1), a fixedly connected extrusion disc (12) is provided at the bottom end of the extrusion spring (11), and an arc-shaped groove (13) is provided at the bottom of the extrusion disc (12).

3. The downhole sand cleaning and plugging-removing backwashing device for oil and water wells according to claim 2 is characterized in that: A fixedly connected annular magnetic block (221) is sleeved on the outside of the guide rod (22), and the top of the annular magnetic block (221) and the bottom of the adapter plate (3) are mutually adsorbed.

4. The downhole sand cleaning and plugging-removing backwashing device for oil and water wells according to claim 3 is characterized in that: A through hole (31) is provided in the interior of the adapter plate (3) at a position opposite to the guide rod (22), and the inner wall of the through hole (31) abuts against and is slidably connected to the outer wall of the guide rod (22).

5. The downhole sand cleaning and plugging-removing backwashing device for oil and water wells according to claim 4 is characterized in that: A threaded limiting cap (222) is sleeved on the top end of the guide rod (22), and the diameter of the limiting cap (222) is greater than the diameter of the through hole (31).

6. The downhole sand cleaning and plugging-removing backwashing device for oil and water wells according to claim 1 is characterized in that: The top of the adapter plate (3) is provided with a plurality of annularly distributed protruding rods (32), the top ends of the plurality of protruding rods (32) are provided with a sealing ring (41) which is fixedly connected to the same, and the top of the sealing ring (41) is fixedly connected to the bottom of the sealing cover (4).

7. The downhole sand cleaning and plugging-removing backwashing device for oil and water wells according to claim 1 is characterized in that: One end of the tension spring (21) is fixedly connected to the adapter plate (3), and the other end of the tension spring (21) is fixedly connected to the adapter seat (2).

Images