Novel oil and water well casing reinforcing device

Abstract

The utility model relates to a novel oil and water well casing reinforcing device which comprises a central pipe, an upper packing assembly and a lower packing assembly, the upper packing assembly and the lower packing assembly are arranged at the lower end of the central pipe at intervals, and the novel oil and water well casing reinforcing device is technically characterized in that a fixing ring seat is arranged in a pipe section, between the upper packing assembly and the lower packing assembly, of the central pipe, and a plurality of radial guide sleeves are evenly arranged on the peripheral wall of the fixing ring seat; an avoiding hole corresponding to the radial guide sleeve is formed in the center pipe, a reducing blocking piece is arranged at the outer end of the radial guide sleeve, a radial plunger is arranged in the radial guide sleeve, the free end of a column rod of the radial plunger penetrates through the reducing blocking piece and then is connected with an arc-shaped extrusion block, and the section, between the arc-shaped extrusion block and the reducing blocking piece, of the column rod is sleeved with a spring. The peripheral face of each arc-shaped extrusion block is sleeved with the same reinforcing sleeve, the peripheral face of each reinforcing sleeve is provided with an anti-disengagement tooth-shaped structure, and the upper portion and the lower portion of each peripheral face are each provided with a plurality of Z-direction long holes. The device is convenient to operate, good in safety and low in reinforcement cost, and meanwhile, a large number of reinforcing agents are prevented from being used.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum casing repair, in particular to a novel casing reinforcer for oil and water wells. Background Art

[0002] Oil and water well casing is a steel pipe used to support the well wall of oil and water wells to ensure the normal operation of the entire oil and water well during the drilling process and after completion. However, with the increase in the production cycle of oil wells, the damage to the side wall of the casing has become the main reason restricting the normal production of oil wells, and it is necessary to use reinforcers and reinforcements to repair it in time.

[0003] The commonly used chemical repair and reinforcement method is to use a reinforcement device to inject the reinforcement agent into the entire cylindrical section of the damaged part of the casing and wait for it to solidify. However, the reinforcement device has high operating risks and uses a large amount of reinforcement material, resulting in high reinforcement costs. Utility Model Content

[0004] The purpose of the utility model is to provide a new oil and water well casing reinforcer with a simple structure and reliable use to solve the above problems. It is easy to operate and has good safety. At the same time, it avoids the use of a large amount of reinforcing agent and has a low reinforcement cost.

[0005] The technical solution of the utility model is:

[0006] A novel oil and water well casing reinforcer comprises a center tube, an upper isolation assembly and a lower isolation assembly which are arranged at the lower end of the center tube and spaced apart. The technical key points are as follows: a fixed ring seat is provided in the tube section between the upper isolation assembly and the lower isolation assembly of the center tube, a plurality of radial guide sleeves are evenly provided on the outer peripheral wall of the fixed ring seat, avoidance holes corresponding to the radial guide sleeves are provided on the center tube, a reduction baffle is provided at the outer end of the radial guide sleeve, a radial plunger is provided in the radial guide sleeve, a column rod free end of the radial plunger passes through the reduction baffle and is connected to an arc-shaped extrusion block, a spring is sleeved on the column rod section between the arc-shaped extrusion block and the reduction baffle, the outer peripheral surface of each arc-shaped extrusion block is sleeved with the same reinforcement sleeve, the outer peripheral surface of the reinforcement sleeve is provided with an anti-slip toothed structure, and a plurality of Z-direction long holes are respectively provided on the upper and lower parts of the outer peripheral surface.

[0007] The above-mentioned novel oil and water well casing reinforcer has a sealing plate at the lower end of the central pipe, a through hole at the center of the sealing plate, and a constant pressure valve fixed outside the through hole.

[0008] The above-mentioned new type of oil and water well casing reinforcer, the upper isolation assembly and the lower isolation assembly respectively include an annular fixed cavity and an annular airbag arranged on the outer periphery of the annular fixed cavity, the inner wall of the annular fixed cavity is connected and fixed to the central tube and is provided with a first connecting hole, and the outer wall of the annular fixed cavity is provided with a second connecting hole connected to the annular airbag.

[0009] In the novel oil and water well casing reinforcer, a sealing ring which is in close contact with the radial guide sleeve is provided on the outer periphery of the radial plunger.

[0010] The above-mentioned new type of oil and water well casing reinforcer, the height of the arc-shaped extrusion block is greater than the height of the reinforcement sleeve, the upper and lower edges of the arc-shaped extrusion block are respectively provided with chamfers, a pit is provided in the middle of the outer circumference of the arc-shaped extrusion block, and the upper and lower parts of the outer circumference of the arc-shaped extrusion block respectively correspond to the areas of the reinforcement sleeve with Z-direction long holes.

[0011] The beneficial effects of the utility model are:

[0012] 1. When in use, pre-select a reinforcement sleeve of appropriate height, put the reinforcement sleeve on the outside of each arc-shaped extrusion block, lower the device into the casing, make the reinforcement sleeve reach the damaged position, and then first fill the compressed air into the annular airbags of the upper and lower sealing components through the central tube. After the annular airbags expand, they are in close contact with the inner wall of the casing to achieve the sealing of the damaged position of the casing; continue to pressurize, and under the drive of pressure, each arc-shaped extrusion block is pushed outward by each radial piston to squeeze the reinforcement sleeve, so that the edges of the Z-direction long holes on the upper and lower parts of the reinforcement sleeve are broken and expanded, and finally fixed to the inner wall of the casing to achieve a tight connection and achieve the purpose of reinforcement.

[0013] 2. After continuing to pressurize, the constant pressure valve opens to release the pressure, the upper pressurizing equipment stops, and the center pipe can be lifted out.

[0014] Based on the above, the utility model is convenient and reliable to construct, solves the problems of high risk in operating the reinforcer and large amount of reinforcement material, has good safety, and saves reinforcement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the reinforcement state of the utility model.

[0017] In the figure: 1. sleeve, 2. annular airbag, 3. second connecting hole, 4. annular fixed cavity, 5. first connecting hole, 6. fixed ring seat, 7. center tube, 8. reinforcement sleeve, 9. arc extrusion block, 10. sealing plate, 11. constant pressure valve, 12. radial plunger, 13. reducing baffle, 14. spring, 15. radial guide sleeve, 16. Z-direction long hole. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings of the specification.

[0019] like Figure 1 , Figure 2As shown, the novel oil and water well casing reinforcer comprises a central pipe 7, an upper packing assembly and a lower packing assembly which are arranged at the lower end of the central pipe 7 and spaced apart.

[0020] Among them, the center tube 7 is provided with a fixed ring seat 6 in the pipe section between the upper sealing component and the lower sealing component, and four radial guide sleeves 15 are evenly arranged on the outer peripheral wall of the fixed ring seat 6. The center tube 7 is provided with avoidance holes corresponding to the radial guide sleeves 15, and the outer end of the radial guide sleeve 15 is provided with a reducing baffle 13, and a radial piston 12 is provided in the radial guide sleeve 15. The free end of the column rod of the radial piston 12 passes through the reducing baffle 13 and is connected to the arc extrusion block 9. The column rod is equipped with a spring 14 on the rod section between the arc extrusion block 9 and the reducing baffle 13, and the outer peripheral surface of each arc extrusion block 9 is equipped with the same reinforcement sleeve 8, and the outer peripheral surface of the reinforcement sleeve 8 is provided with an anti-slip toothed structure, and a plurality of Z-direction long holes 16 are respectively provided on the upper and lower parts of the outer peripheral surface.

[0021] In this embodiment, a plugging plate 10 is provided at the lower end of the central tube 7, and a through hole is provided at the center of the plugging plate 10, and a constant pressure valve 11 is fixed on the outside of the through hole. The upper and lower sealing assemblies respectively include an annular fixed cavity 4 and an annular airbag 2 provided on the outer periphery of the annular fixed cavity 4, the inner wall of the annular fixed cavity 4 is connected and fixed to the central tube 7 and provided with a first connecting hole 5, and the outer wall of the annular fixed cavity 4 is provided with a second connecting hole 3 connected with the annular airbag 2. A sealing ring in close contact with the radial guide sleeve 15 is provided on the outer periphery of the radial piston 12. The height of the arc extrusion block 9 is greater than the height of the reinforcement sleeve 8, and the upper and lower edges of the arc extrusion block 9 are respectively provided with chamfers, and a pit is provided in the middle of the outer peripheral surface of the arc extrusion block 9, and the upper and lower parts of the outer peripheral surface of the arc extrusion block 9 correspond to the areas of the reinforcement sleeve 8 with the Z-direction long hole 16.

[0022] Working principle:

[0023] 1. When in use, the reinforcement sleeve 8 is sleeved on the outside of each arc-shaped extrusion block 9, the center pipe 7 of the device is connected and fixed to the oil pipe, and then the device is lowered into the casing 1, so that the reinforcement sleeve 8 reaches the damaged position, and then the compressed air is respectively filled into the annular airbags 2 of the upper and lower sealing components through the center pipe 7. After the annular airbags 2 are expanded, they are in close contact with the inner wall of the casing 1 to achieve the sealing of the damaged position of the casing 1; continue to pressurize, and under the drive of pressure, each arc-shaped extrusion block 9 is pushed outward by each radial piston 12 to squeeze the reinforcement sleeve 8, so that the edges of the Z-direction long holes 16 on the upper and lower parts of the reinforcement sleeve 8 are broken and expanded, and finally fixed to the inner wall of the casing 1, so as to achieve a tight connection and achieve the purpose of reinforcement, and the anti-slip toothed structure further enhances the stability of the connection.

[0024] 2. After continuing to pressurize, the constant pressure valve 11 opens to release the pressure, the upper pressurizing equipment stops, the annular airbag 2 shrinks and the arc-shaped extrusion block 9 can shrink. In order to ensure the stability of the connection, the oil pipe and the center pipe 7 can be rotated to set the angle, and the above operation is repeated to make each radial piston 12 change the angle to push each arc-shaped extrusion block 9 to extrude the reinforcement sleeve 8, thereby reinforcing the reinforcement sleeve 8 and the inner wall of the casing.

[0025] 3. After the operation is completed, the pressure is released, the annular airbag 2 shrinks and the arc-shaped extrusion block 9 can shrink, and the oil pipe and the center pipe 7 are lifted to lift out the device.

[0026] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A novel oil and water well casing reinforcer, comprising a central pipe, an upper packing assembly and a lower packing assembly arranged at the lower end of the central pipe and spaced apart, characterized in that: The center tube is provided with a fixed ring seat in the pipe section between the upper sealing component and the lower sealing component, and a plurality of radial guide sleeves are evenly arranged on the outer peripheral wall of the fixed ring seat, and the center tube is provided with avoidance holes corresponding to the radial guide sleeves, and the outer end of the radial guide sleeve is provided with a reducing baffle, and a radial plunger is provided in the radial guide sleeve, and the free end of the column rod of the radial plunger passes through the reducing baffle and is connected to the arc extrusion block, and the column rod is provided with a spring on the rod section between the arc extrusion block and the reducing baffle, and the outer peripheral surface of each arc extrusion block is provided with the same reinforcement sleeve, and the outer peripheral surface of the reinforcement sleeve is provided with an anti-slip toothed structure, and a plurality of Z-direction long holes are respectively provided on the upper and lower parts of the outer peripheral surface.

2. The novel oil and water well casing reinforcer according to claim 1 is characterized in that: A blocking plate is provided at the lower end of the central tube, and a through hole is provided at the center of the blocking plate, and a constant pressure valve is fixed on the outside of the through hole.

3. The novel oil and water well casing reinforcer according to claim 1 is characterized in that: The upper isolation assembly and the lower isolation assembly respectively include an annular fixed cavity and an annular airbag arranged on the outer periphery of the annular fixed cavity. The inner wall of the annular fixed cavity is connected and fixed to the central tube and is provided with a first connecting hole. The outer wall of the annular fixed cavity is provided with a second connecting hole connected to the annular airbag.

4. The novel oil and water well casing reinforcer according to claim 1 is characterized in that: A sealing ring which is in close contact with the radial guide sleeve is arranged on the outer periphery of the radial piston.

5. The novel oil and water well casing reinforcer according to claim 1 is characterized in that: The height of the arc-shaped extrusion block is greater than the height of the reinforcement sleeve, the upper and lower edges of the arc-shaped extrusion block are respectively provided with chamfers, a pit is provided in the middle of the outer circumference of the arc-shaped extrusion block, and the upper and lower parts of the outer circumference of the arc-shaped extrusion block respectively correspond to the areas of the reinforcement sleeve with Z-direction long holes.

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