Circulating well-washing under-pressure blanking plug

Abstract

The utility model relates to the technical field of underground blanking plugs, in particular to a circulating well-washing under-pressure blanking plug. The pressure blanking plug capable of circularly washing the well comprises a pipe body, an annular cavity is formed in the pipe body, a plurality of coaxial variable-diameter well washing holes which are annularly distributed and arranged in the radial direction are formed in the position, close to the bottom of the annular cavity, of the pipe body, and a blockage reducing component used for blocking the coaxial variable-diameter well washing hole is arranged in each coaxial variable-diameter well washing hole. A T-shaped plugging head which is elastically connected and located above the coaxial variable-diameter well washing hole is installed in an annular cavity formed in the pipe body, and a plurality of hole opening components which are distributed in an annular mode and used for conducting plug removing on the plug reducing component are installed on the upper surface of the T-shaped plugging head. The pressurized plug capable of washing the well circularly has the advantage that oil stains in the well are prevented from entering the coaxial variable-diameter well washing hole to block the coaxial variable-diameter well washing hole.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole plugs, in particular to a circulatory well-washing pressure plug. Background Art

[0002] During the well repair operation on oil and water wells, in order to balance the well pressure and prevent blowout accidents, it is necessary to use a hydraulic well pressure killer. Since the well pressure killer fluid is a chemical agent, it is easy to contaminate the oil layer and affect the oil layer recovery rate. In order to reduce the pollution to the oil layer, when repairing high-pressure oil, gas and water wells, pressure operation is usually adopted, that is, the tubing is raised and lowered without suppressing the well, without releasing the blowout, and maintaining the original pressure in the well. Before raising and lowering the oil pipe, the oil pipe must first be blocked with a relevant plug to prevent high-pressure liquids such as crude oil and water from entering the oil pipe and overflowing from the wellhead. After the well is completed and repaired, a well washing operation must be performed, but the existing plug does not have the well washing function and needs to be carried out in conjunction with other downhole tools. The construction steps are relatively cumbersome. In response to the above problem, the patent number CN217028854U proposes a circulatory well washing pressure plug The device is a device that pressurizes the inside of the tubing string to cut off the shear pin and cause the rupture plug to slide down. During the downward movement of the rupture plug, the well-washing arc plate can be sheared off until the spring pin enters the annular groove and the rupture plug is locked. At this time, the well-washing circulation hole is opened, and the well-washing circulation can be carried out. The rupture plug is broken at a later time. However, due to the need to shear off the pin and the well-washing arc plate and the need to break the rupture plug at a later time, the plug is a disposable device and cannot be reused. At the same time, during the lowering of the tubing body into the well, oil and dirt in the oil well will spread into the well-washing circulation hole, which has the risk of clogging the well-washing circulation hole.

[0003] Therefore, it is necessary to provide a new circulatory well-washing pressure plugging device to solve the above-mentioned technical problems. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a circulatory well-washing pressure plugger.

[0005] The utility model provides a circulatory well-washing pressure plugging device comprising a pipe body, an annular cavity is formed in the pipe body, and a plurality of coaxial variable-diameter well-washing holes are formed on the pipe body near the bottom of the annular cavity and arranged in an annular manner. Each of the coaxial variable-diameter well-washing holes is provided with a plugging reduction component for sealing the coaxial variable-diameter well-washing hole;

[0006] The blockage reducing component includes a steel ball, which is inserted into the coaxial variable diameter well washing hole, and a tension spring B is fixedly installed on the inner sphere of the steel ball, and the other end of the tension spring B is fixedly connected to the inner hole wall of the coaxial variable diameter well washing hole;

[0007] A T-shaped plugging head is installed in the annular cavity of the pipe body, which is elastically connected and located above the coaxial variable-diameter well washing hole, and a plurality of opening components are installed on the upper surface of the T-shaped plugging head, which are distributed in an annular manner and used to unblock the blockage-reducing component;

[0008] The opening component includes an L-shaped rod, the vertical rod head of the L-shaped rod is fixedly mounted on the upper surface of the T-shaped plugging head, and a mounting hole is opened in the horizontal rod of the L-shaped rod, and an elastically connected sliding rod is inserted into the mounting hole.

[0009] Preferably, a spring is fixedly installed on the insertion end of the sliding rod, and the other end of the spring is fixedly connected to the inner wall of the mounting hole, and the elastic coefficient of the spring is greater than that of the tension spring B.

[0010] Preferably, a mounting hole extends from the other end of the sliding rod and is fixedly engaged with a ball head, and the ball head abuts against the inner wall of the annular cavity.

[0011] Preferably, the diameter of the coaxial variable-diameter well washing hole increases from inside the pipe body to outside, and the blockage reduction component is located in the cavity of the large-diameter coaxial variable-diameter well washing hole, and the ball diameter of the steel ball is the same as the large-diameter coaxial variable-diameter well washing hole.

[0012] Preferably, a plurality of annularly distributed elastic connectors are installed in the tube body, and the elastic connector includes a piston column, which is fixedly installed in the annular cavity opened in the tube body and arranged along the axial direction of the tube body, and the piston column passes through the sliding through hole opened in the T-shaped plugging head and is slidably connected to the sliding through hole, and a tension spring A is sleeved on the piston column, one end of the tension spring A is fixedly connected to the upper surface of the T-shaped plugging head, and the other end of the tension spring A is fixedly connected to the inner top wall of the annular cavity.

[0013] Preferably, a pressing disk is fixedly mounted on the T-shaped plugging head, and a sealing ring is fixedly mounted on the outer ring wall of the T-shaped plugging head.

[0014] Preferably, an upper joint is fixedly installed on the top of the pipe body.

[0015] Compared with related technologies, the recyclable well-washing pressure plugging device provided by the utility model has the following beneficial effects:

[0016] 1. In the initial state of the utility model, the T-shaped plugging head is always located above the coaxial variable diameter well washing hole due to the action of the tension spring A, and the steel ball is blocked in the coaxial variable diameter well washing hole under the action of the tension spring B, thereby preventing the oil in the well from entering the coaxial variable diameter well washing hole and causing the coaxial variable diameter well washing hole to be blocked;

[0017] 2. The utility model applies pressure in the pipe string so that the T-shaped plugging head slides down along the piston column. At the same time, the sliding rod in the opening component slides down along the annular cavity opened in the pipe body through the ball head until the sliding rod slides into the coaxial variable-diameter well washing hole. Then, the sliding rod is driven to be inserted into the coaxial variable-diameter well washing hole under the elastic force of the spring. Since the elastic coefficient of the spring is greater than the tension spring B, the sliding rod pushes the steel ball out of the coaxial variable-diameter well washing hole. At this time, the coaxial variable-diameter well washing hole forms a through-hole mode, so cyclic well washing can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a preferred embodiment of a circulatory well-washing pressure plugging device provided by the utility model;

[0019] Figure 2 for Figure 1 The cross-sectional structural diagram shown;

[0020] Figure 3 for Figure 2 A schematic diagram of a partially enlarged structure of the tube body shown;

[0021] Figure 4 for Figure 2 The structural diagram of the T-type plugging head shown;

[0022] Figure 5 for Figure 4 Schematic diagram of the structure of the opening component shown.

[0023] Numbers in the figure: 1. Tube body; 1a. Coaxial variable-diameter well washing hole; 1b. Annular cavity; 11. Upper joint; 2. T-type plugging head; 2a. Sliding through hole; 21. Pressing disk; 22. Sealing ring; 3. Elastic connecting part; 31. Piston column; 32. Tension spring A; 4. Blockage-reducing component; 41. Steel ball; 42. Tension spring B; 5. Opening component; 51. L-shaped rod; 51a. Mounting hole; 52. Sliding rod; 521. Ball head; 53. Spring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0026] See also Figures 1 to 5 The embodiment of the present invention provides a circulatory well-washing pressure plug, which includes a pipe body 1, a T-shaped plugging head 2, a plugging reduction component 4 and a hole opening component 5.

[0027] In the embodiments of the present invention, please refer to Figures 1 to 5 , an upper joint 11 is fixedly installed on the top of the pipe body 1, an annular cavity 1b is opened in the pipe body 1, and a plurality of annularly distributed and radially arranged coaxial variable diameter well washing holes 1a are opened on the pipe body 1 near the bottom of the annular cavity 1b, and each of the coaxial variable diameter well washing holes 1a is provided with a blockage reduction component 4 for blocking the coaxial variable diameter well washing hole 1a, the aperture of the coaxial variable diameter well washing hole 1a increases from the inside of the pipe body 1 to the outside, and the blockage reduction component 4 is located in the cavity with a large aperture of the coaxial variable diameter well washing hole 1a, and the blockage reduction component 4 includes a steel ball 41, the steel ball 41 is inserted into the coaxial variable diameter well washing hole 1a, and a tension spring B42 is fixedly installed on the inner ball of the steel ball 41, the other end of the tension spring B42 is fixedly connected to the inner hole wall of the coaxial variable diameter well washing hole 1a, and the ball diameter of the steel ball 41 is the same as the large aperture of the coaxial variable diameter well washing hole 1a;

[0028] A T-shaped plugging head 2 is installed in the annular cavity 1b opened in the pipe body 1, which is elastically connected and located above the coaxial variable-diameter well washing hole 1a. A plurality of elastic connectors 3 are installed in the pipe body 1, and the elastic connector 3 includes a piston column 31. The piston column 31 is fixedly installed in the annular cavity 1b opened in the pipe body 1 and is axially arranged along the pipe body 1. The piston column 31 passes through the sliding through hole 2a opened in the T-shaped plugging head 2 and is slidably connected to the sliding through hole 2a. A tension spring A32 is sleeved on the piston column 31, one end of the tension spring A32 is fixedly connected to the upper surface of the T-shaped plugging head 2, and the other end of the tension spring A32 is fixedly connected to the inner top wall of the annular cavity 1b.

[0029] It should be noted that: when in use, the upper joint 11 is used to install the pipe body 1 to the lower end of the downhole pipe string and then the entire pipe string is lowered into the well. During this process, the T-shaped plugging head 2 is always located above the coaxial variable diameter well washing hole 1a due to the action of the tension spring A32, and the steel ball 41 is sealed in the coaxial variable diameter well washing hole 1a under the action of the tension spring B42, preventing oil and dirt in the well from entering the coaxial variable diameter well washing hole 1a and causing the coaxial variable diameter well washing hole 1a to be blocked.

[0030] In the embodiments of the present invention, please refer to Figures 1 to 5, the upper surface of the T-shaped plugging head 2 is equipped with a plurality of annularly distributed opening components 5 for unblocking the blockage-reducing component 4, and the opening component 5 includes an L-shaped rod 51, the vertical rod head of the L-shaped rod 51 is fixedly mounted on the upper surface of the T-shaped plugging head 2, and a mounting hole 51a is opened in the horizontal rod of the L-shaped rod 51, and an elastically connected sliding rod 52 is inserted into the mounting hole 51a, and a spring 53 is fixedly mounted on the inserted end of the sliding rod 52, and the other end of the spring 53 is fixedly connected to the inner wall of the mounting hole 51a, and the elastic coefficient of the spring 53 is greater than that of the tension spring B42, and the other end of the sliding rod 52 extends out of the mounting hole 51a and is fixedly fitted with a ball head 521, and the ball head 521 is against the inner wall of the annular cavity 1b;

[0031] It should be noted that: after the entire tubing string is lowered to the predetermined depth and the well is completed, pressure is applied in the tubing string to cause the T-shaped plugging head 2 to slide down along the piston rod 31. At the same time, the sliding rod 52 in the opening component 5 slides down along the annular cavity 1b opened in the tubing body 1 through the ball head 521 until the sliding rod 52 slides into the coaxial variable-diameter well washing hole 1a. Then, under the elastic force of the spring 53, the sliding rod 52 is driven to be inserted into the coaxial variable-diameter well washing hole 1a. Since the elastic coefficient of the spring 53 is greater than the tension spring B42, the sliding rod 52 pushes the steel ball 41 out of the coaxial variable-diameter well washing hole 1a. At this time, the coaxial variable-diameter well washing hole 1a forms a through-hole mode, so cyclic well washing can be carried out.

[0032] After the tube body 1 is subsequently removed, it is only necessary to push the steel ball 41 inward by external force, so that the steel ball 41 pushes the sliding rod 52 to slip out of the coaxial variable diameter well washing hole 1a. At this time, under the elastic force of the tension spring A32, the T-shaped plugging head 2 is reset to the top of the annular cavity 1b opened in the tube body 1 for reuse.

[0033] It is worth noting that: in this application, the diameter of the ball head 521 is smaller than the inner diameter of the tension spring B42 and larger than the rod diameter of the sliding rod 52, and the sliding rod 52 is coaxially arranged with the tension spring B42. Therefore, when the ball head 521 pushes the steel ball 41 out of the coaxial variable diameter well washing hole 1a, the coaxial variable diameter well washing hole 1a and the pipe body 1 form a through hole mode.

[0034] Furthermore, a pressing disk 21 is fixedly installed on the T-shaped plugging head 2. The provided pressing disk 21 facilitates pressurizing the T-shaped plugging head 2 in the pipe body 1, and a sealing ring 22 is fixedly provided on the outer ring wall of the T-shaped plugging head 2 to ensure that the gas underground will not enter the working pipe string during pressurized operation.

[0035] The working principle of the circulating well-washing pressure plugging device provided by the utility model is as follows:

[0036] When in use, the upper joint 11 is used to install the pipe body 1 to the lower end of the downhole pipe string, and then the entire pipe string is lowered into the well. During this process, the T-shaped plugging head 2 is always located above the coaxial variable diameter well washing hole 1a due to the action of the tension spring A32, and the steel ball 41 is blocked in the coaxial variable diameter well washing hole 1a under the action of the tension spring B42, preventing the oil in the well from entering the coaxial variable diameter well washing hole 1a and causing the coaxial variable diameter well washing hole 1a to be blocked. When the entire pipe string is lowered to the oil well at a predetermined depth, pressure is applied in the pipe string to cause the T-shaped plugging head 2 to move along the piston The column 31 slides down, and at the same time, the sliding rod 52 in the opening component 5 slides down along the annular cavity 1b opened in the pipe body 1 through the ball head 521 until the sliding rod 52 slides into the coaxial variable diameter well washing hole 1a. Then, under the elastic force of the spring 53, the sliding rod 52 is driven to be inserted into the coaxial variable diameter well washing hole 1a. Since the elastic coefficient of the spring 53 is greater than the tension spring B42, the ball head 521 on the sliding rod 52 pushes the steel ball 41 out of the coaxial variable diameter well washing hole 1a. At this time, the coaxial variable diameter well washing hole 1a forms a through hole mode, so cyclic well washing can be carried out.

[0037] After the tube body 1 is subsequently removed, it is only necessary to push the steel ball 41 inward by external force, so that the steel ball 41 pushes the sliding rod 52 to slip out of the coaxial variable diameter well washing hole 1a. At this time, under the elastic force of the tension spring A32, the T-shaped plugging head 2 is reset to the top of the annular cavity 1b opened in the tube body 1 for reuse.

[0038] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description 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 circulatory well-washing pressure plugging device, characterized in that: The invention comprises a pipe body (1), wherein an annular cavity (1b) is provided in the pipe body (1), and a plurality of annularly distributed and radially arranged coaxial variable-diameter well-washing holes (1a) are provided on the pipe body (1) near the bottom of the annular cavity (1b), and each of the coaxial variable-diameter well-washing holes (1a) is provided with a blockage-reducing component (4) for sealing the coaxial variable-diameter well-washing hole (1a); The blockage reducing component (4) comprises a steel ball (41), the steel ball (41) is inserted into the coaxial variable diameter well washing hole (1a), and a tension spring B (42) is fixedly installed on the inner sphere of the steel ball (41), and the other end of the tension spring B (42) is fixedly connected to the inner hole wall of the coaxial variable diameter well washing hole (1a); A T-shaped plugging head (2) is installed in the annular cavity (1b) formed in the pipe body (1) and is elastically connected and located above the coaxial variable-diameter well-washing hole (1a), and a plurality of opening components (5) are installed on the upper surface of the T-shaped plugging head (2) and are distributed in an annular manner and used to unblock the blockage-reducing component (4); The hole-opening component (5) comprises an L-shaped rod (51), the vertical rod head of the L-shaped rod (51) is fixedly mounted on the upper surface of the T-shaped plugging head (2), and a mounting hole (51a) is formed in the horizontal rod of the L-shaped rod (51), and an elastically connected sliding rod (52) is inserted into the mounting hole (51a).

2. The recyclable well flushing pressure plugging device according to claim 1 is characterized in that: A spring (53) is fixedly mounted on the insertion end of the sliding rod (52), and the other end of the spring (53) is fixedly connected to the inner wall of the mounting hole (51a), and the elastic coefficient of the spring (53) is greater than that of the tension spring B (42).

3. The recyclable well-washing pressure plugging device according to claim 2 is characterized in that: The other end of the sliding rod (52) extends out of the mounting hole (51a) and is fixedly engaged with a ball head (521), and the ball head (521) abuts against the inner wall of the annular cavity (1b).

4. The recyclable well flushing pressure plugging device according to claim 1 is characterized in that: The diameter of the coaxial variable-diameter well-washing hole (1a) increases from the inside of the pipe body (1) to the outside, and the blockage reduction component (4) is located in the cavity of the large-diameter hole of the coaxial variable-diameter well-washing hole (1a). The ball diameter of the steel ball (41) is the same as the large-diameter hole of the coaxial variable-diameter well-washing hole (1a).

5. The recyclable well flushing pressure plugging device according to claim 1 is characterized in that: A plurality of elastic connectors (3) distributed in an annular manner are installed in the tube body (1), and the elastic connector (3) includes a piston column (31), the piston column (31) is fixedly installed in the annular cavity (1b) opened in the tube body (1) and is arranged axially along the tube body (1), and the piston column (31) passes through the sliding through hole (2a) opened in the T-shaped plugging head (2) and is slidably connected to the sliding through hole (2a), and a tension spring A (32) is sleeved on the piston column (31), one end of the tension spring A (32) is fixedly connected to the upper surface of the T-shaped plugging head (2), and the other end of the tension spring A (32) is fixedly connected to the inner top wall of the annular cavity (1b).

6. The recyclable well flushing pressure plugging device according to claim 1 is characterized in that: A pressing disc (21) is fixedly mounted on the T-shaped plugging head (2), and a sealing ring (22) is fixedly sleeved on the outer ring wall of the T-shaped plugging head (2).

7. The recyclable well flushing pressure plugging device according to claim 1 is characterized in that: An upper joint (11) is fixedly mounted on the top of the tube body (1).

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