Salvageable expansion pipe reinforcing device

Abstract

The utility model relates to the technical field of petroleum casing pipe repair, in particular to a fishable expansion pipe reinforcing device which comprises a middle jumper pipe and a multi-stage hydraulic cylinder, the upper end of the middle jumper pipe is connected with an upper expansion pipe body, and the lower end of the middle jumper pipe is connected with a lower expansion pipe body. An upper expansion cone is clamped in an upper port of the upper expansion pipe body, a lower expansion cone is clamped in a lower port of the lower expansion pipe body, a groove I is formed in the upper end face of the upper expansion cone, and the lower end of the multi-stage hydraulic cylinder is arranged in the groove I; a lower expansion cone pull rod is arranged in the middle jumper pipe, the lower end of the lower expansion cone pull rod is arranged in the lower expansion cone, and the upper end of the lower expansion cone pull rod is arranged in the multi-stage hydraulic cylinder; a groove II is formed in the upper end face of the lower expansion cone pull rod, and the lower end of a piston rod in the multi-stage hydraulic cylinder is arranged in the groove II. The salvageable expansion pipe reinforcing device is reasonable in structural design, expansion and salvage integrated operation can be achieved, the whole set of expansion reinforcing construction can be completed through one process pipe column, a bottom plug does not need to be milled and salvaged or other process measures do not need to be adopted to treat a shaft, safety, reliability, rapidness and convenience are achieved, and operation efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum casing repair, in particular to a salvageable expansion pipe reinforcement device. Background Art

[0002] During the development of oil fields, due to geological activities, formation slippage, interlayer pressure difference, block pressure difference, mudstone water absorption and expansion, frequent operation and construction, water injection, gas injection, corrosion and other effects, the technical condition of oil and water well casings is getting worse and worse. The number of casing concave, deformation, holes, cracks, and faults is increasing year by year, which will lead to the shutdown of oil and gas wells, the cessation of water well injection, the destruction of well networks, and the deterioration of reserve control. This is an important factor affecting the stable production of oil fields. In order to extend the production time and service life of oil wells, it is generally necessary to repair the casing. However, it is difficult to remove the traditional integral expansion casing repair device after it is successfully repaired, which affects the operation of the lower part of the repaired well section, delays the construction period, and increases the construction cost. Summary of the invention

[0003] The utility model provides a salvageable expansion pipe reinforcement device to address the above-mentioned deficiencies in the prior art.

[0004] The utility model discloses a salvageable expansion pipe reinforcement device, comprising an intermediate jumper tube and a multi-stage hydraulic cylinder, wherein the upper end of the intermediate jumper tube is threadedly connected to an upper expansion pipe body, and the lower end is threadedly connected to a lower expansion pipe body, an upper expansion cone is clamped in the upper port of the upper expansion pipe body, and a lower expansion cone is clamped in the lower port of the lower expansion pipe body, and a circular groove I is provided on the upper end surface of the upper expansion cone, and the lower end of the multi-stage hydraulic cylinder is placed in the groove I and threadedly connected thereto; a lower expansion cone pull rod is coaxially provided in the intermediate jumper tube, and the lower end of the lower expansion cone pull rod is placed in the lower expansion cone and fixed thereto by a locking nut, and the upper end of the lower expansion cone pull rod is placed in the multi-stage hydraulic cylinder; a groove II is provided on the upper end surface of the lower expansion cone pull rod, and the lower end of the piston rod in the multi-stage hydraulic cylinder is placed in the groove II and threadedly connected thereto.

[0005] As a further improvement of the utility model, the multi-stage hydraulic cylinder is composed of a primary hydraulic cylinder and a secondary hydraulic cylinder. The primary hydraulic cylinder is composed of a housing Ⅰ, a piston rod Ⅰ and a piston Ⅰ. The secondary hydraulic cylinder is composed of a housing Ⅱ, a piston rod Ⅱ and a piston Ⅱ. The lower end of the housing Ⅰ is connected to the upper end of the housing Ⅱ through a thread. The lower end of the housing Ⅱ is placed in the groove Ⅰ of the upper expansion cone and is threadedly connected thereto. An upper sealing seat is fixed to the upper end of the inner wall of the housing Ⅰ and a lower sealing seat is fixed to the lower end. A sealing seat is fixed at the lower end of the inner wall, the boss I on the outer wall of the upper end of the lower expansion cone pull rod is placed in the shell II and sits on the sealing seat, the lower end of the piston rod II is placed in the groove II on the upper end of the lower expansion cone pull rod and is threadedly connected to it, the boss II on the outer wall of the upper end of the piston rod II sits on the lower sealing seat, the lower end of the piston rod I is placed in the groove III on the upper end of the piston rod II and is threadedly connected to it, and the upper end is placed outside the shell I and connected to the drilling tool; a piston I is provided on the lower outer wall of the piston rod I, and a piston II is provided on the lower outer wall of the piston rod II.

[0006] As a further improvement of the utility model, a pressure channel I is coaxially provided in the piston rod I, and a pressure channel II is coaxially provided in the piston rod II, and the pressure channel I and the pressure channel II are connected.

[0007] As a further improvement of the utility model, a pressure outlet hole I is provided on the circumference of the outer wall of the piston rod I below the piston I, and a pressure outlet hole II is provided on the circumference of the outer wall of the piston rod II below the piston II. The pressure outlet hole I is connected to the pressure channel I, and the pressure outlet hole II is connected to the pressure channel II.

[0008] As a further improvement of the utility model, a rubber sealing ring I is sleeved on the outer wall of the upper expansion tube body, and a rubber sealing ring II is sleeved on the outer wall of the lower expansion tube body.

[0009] As a further improvement of the utility model, one or more grooves IV are respectively provided around the upper sealing seat, the lower sealing seat and the inner wall of the sealing seat, and a sealing ring I is provided in the groove IV.

[0010] As a further improvement of the utility model, one or more grooves V are provided around the outer walls of the pistons I and II, and a sealing ring II is provided in the groove V.

[0011] The salvageable expandable pipe reinforcement device of the utility model has a reasonable structural design and can realize integrated expansion and salvaging operations. A whole set of expansion reinforcement construction can be completed with one process pipe string. There is no need to grind and salvage bottom plugs or take other process measures to process the wellbore. The device is safe, reliable, fast and convenient, and can improve operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a structural sectional view of the utility model. Implementation

[0013] The utility model discloses a salvageable expansion pipe reinforcement device, comprising an intermediate jumper pipe 1 and a multi-stage hydraulic cylinder 2, wherein the upper end of the intermediate jumper pipe 1 is threadedly connected to an upper expansion pipe body 3, and the lower end is threadedly connected to a lower expansion pipe body 4, an upper expansion cone 5 is clamped in the upper port of the upper expansion pipe body 3, and a rubber sealing ring I 21 is sleeved on the outer wall thereof, a lower expansion cone 6 is clamped in the lower port of the lower expansion pipe body 4, and a rubber sealing ring II 22 is sleeved on the outer wall thereof, and a circular ring groove I is provided on the upper end surface of the upper expansion cone 5.

[0014] The multi-stage hydraulic cylinder 2 is composed of a primary hydraulic cylinder and a secondary hydraulic cylinder. The primary hydraulic cylinder is composed of a housing Ⅰ8, a piston rod Ⅰ9 and a piston Ⅰ10, and the secondary hydraulic cylinder is composed of a housing Ⅱ11, a piston rod Ⅱ12 and a piston Ⅱ13. The lower end of the housing Ⅰ8 is connected to the upper end of the housing Ⅱ11 by threads, and the lower end of the housing Ⅱ11 is placed in the groove Ⅰ of the upper expansion cone 5 and is threadedly connected thereto; an upper sealing seat 14 is fixed to the upper end of the inner wall of the housing Ⅰ8, and a lower sealing seat 15 is fixed to the lower end; a sealing seat 16 is fixed to the lower end of the inner wall of the housing Ⅱ11, and two grooves IV are respectively arranged around the inner walls of the upper sealing seat 14, the lower sealing seat 15 and the sealing seat 16, and a sealing ring Ⅰ23 is arranged in the groove IV.

[0015] A lower expansion cone tie rod 7 is coaxially arranged in the intermediate jumper tube 1, the lower end of the lower expansion cone tie rod 7 is placed in the lower expansion cone 6 and fixed thereto by a locking nut 24, the boss I on the outer wall of the upper end of the lower expansion cone tie rod 7 is placed in the shell Ⅱ11 and sits on the sealing seat 16, a groove II is provided on the upper end surface of the lower expansion cone tie rod 7, the lower end of the piston rod Ⅱ12 is placed in the groove II at the upper end of the lower expansion cone tie rod 7 and is threadedly connected thereto, the boss II on the outer wall of the upper end of the piston rod Ⅱ12 sits on the lower sealing seat 15, the lower end of the piston rod Ⅰ9 is placed in the groove III at the upper end of the piston rod Ⅱ12 and is threadedly connected thereto, the upper end is placed outside the shell Ⅰ8 and connected to the drilling tool; a piston Ⅰ10 is provided on the lower outer wall of the piston rod Ⅰ9, a piston Ⅱ13 is provided on the lower outer wall of the piston rod Ⅱ12, two grooves V are provided around the outer walls of the piston Ⅰ10 and the piston Ⅱ13, and a sealing ring Ⅱ25 is provided in the groove V.

[0016] A pressure channel I17 is coaxially provided in the piston rod I9, and a pressure channel II18 is coaxially provided in the piston rod II12, and the pressure channel I17 and the pressure channel II18 are connected; a pressure outlet hole I19 is circumferentially provided on the outer wall of the piston rod I9 below the piston I10, and the pressure outlet hole I19 is connected to the pressure channel I17; a pressure outlet hole II20 is circumferentially provided on the outer wall of the piston rod II12 below the piston II13, and the pressure outlet hole II20 is connected to the pressure channel II18.

[0017] The utility model can be salvaged expansion pipe reinforcement device adopts φ118mm*5mm middle cross-over pipe, φ114mm*7mm upper expansion pipe body 3 and lower expansion pipe body 4, φ108mm upper expansion cone 5 and lower expansion cone 6, rubber sealing ring I21 and rubber sealing ring II22 with thickness of 1mm-1.5mm (the thickness of the rubber ring can be adjusted as needed), and the upper expansion pipe body 3 and the lower expansion pipe body 4 each cover the casing damaged section of at least 4m.

[0018] When the utility model is used for on-site construction of the salvageable expansion pipe reinforcement device, first, according to the different wall thicknesses of the casing, a φ120mm or φ122mm milling cone is lowered, and the well is milled and cleared to 10m below the patching section. After the milling channel is qualified, a well clearing gauge is lowered to clear the well. After the well clearing gauge passes smoothly and unobstructed, the device is lowered to the well section that needs to be patched and repaired with an oil pipe (or drill pipe). On the ground, a high-pressure pump is used to pressurize the oil pipe (or drill pipe), and the water pressure enters the pressure channel Ⅰ17 and the pressure channel Ⅱ18, and flows out from the pressure outlet hole Ⅰ19 and the pressure outlet hole Ⅱ20. When the pressure reaches a certain value, the hydraulic pressure pushes the piston rod Ⅰ9 and the piston rod Ⅱ 12 moves downward at the same time, pushes the upper expansion cone 5 into the upper expansion tube body 3, and expands the upper expansion tube body and the rubber sealing ring Ⅰ21. After expansion, the lower end of the shell Ⅱ11 collides with the upper edge of the upper expansion tube body 3 and stops moving; at this time, the piston Ⅱ13 drives the lower expansion cone pull rod 7 to start moving upward, pulls the lower expansion cone 6 into the lower expansion tube body 4, and expands the lower expansion tube body 4 and the rubber sealing ring Ⅱ22. After expansion, the pressure is released to complete the expansion, so that the middle jumper tube 1 is close to the inner wall of the foundation casing, anchoring, sealing and reinforcing the casing, and after the ground fracturing fluctuation stops and the pressure continues to rise, the pump is stopped to release the pressure and the tool is removed.

[0019] When the salvageable expandable pipe reinforcement device of the utility model needs to be salvaged, first, use a Ф120 special flat-bottomed grinding shoe to grind the anchoring part of the upper end of the upper expandable pipe body 3, and the footage is about 200 cm. Stop the grinding and milling. After the grinding and milling is completed, salvage the middle jump pipe 1. Since the middle jump pipe 1 and the lower expandable pipe body 4 are threadedly connected, the middle jump pipe 1 can be taken out by turning it upside down with a tool, and then the Ф120 special flat-bottomed grinding shoe is lowered to determine the exact position of the lower end of the lower expandable pipe body 4. Mark it during grinding and milling. After grinding and milling without resistance, stop grinding and milling, lift and lower the pipe column to ensure that the grinding and milling are completed, and remove the tool.

Claims

1. A salvageable expansion pipe reinforcement device, comprising an intermediate cross-over pipe (1) and a multi-stage hydraulic cylinder (2), characterized in that The upper end of the intermediate jumper tube (1) is threadedly connected to the upper expansion tube body (3), and the lower end is threadedly connected to the lower expansion tube body (4). An upper expansion cone (5) is clamped in the upper port of the upper expansion tube body (3), and a lower expansion cone (6) is clamped in the lower port of the lower expansion tube body (4). A circular groove I is provided on the upper end surface of the upper expansion cone (5), and the lower end of the multi-stage hydraulic cylinder (2) is placed in the groove I and threadedly connected thereto; a lower expansion cone tie rod (7) is coaxially provided in the intermediate jumper tube (1), the lower end of the lower expansion cone tie rod (7) is placed in the lower expansion cone (6) and is fixed to the lower expansion cone (6) by a locking nut (24), and the upper end of the lower expansion cone tie rod (7) is placed in the multi-stage hydraulic cylinder (2); a groove II is provided on the upper end surface of the lower expansion cone tie rod (7), and the lower end of the piston rod in the multi-stage hydraulic cylinder (2) is placed in the groove II and threadedly connected thereto.

2. The salvageable expansion pipe reinforcement device according to claim 1 is characterized in that The multi-stage hydraulic cylinder (2) is composed of a first-stage hydraulic cylinder and a second-stage hydraulic cylinder. The first-stage hydraulic cylinder is composed of a housing I (8), a piston rod I (9) and a piston I (10). The second-stage hydraulic cylinder is composed of a housing II (11), a piston rod II (12) and a piston II (13). The lower end of the housing I (8) is connected to the upper end of the housing II (11) by threads. The lower end of the housing II (11) is placed in the groove I of the upper expansion cone (5) and is threadedly connected thereto. An upper sealing seat (14) is fixed to the upper end of the inner wall of the housing I (8), and a lower sealing seat (15) is fixed to the lower end. A sealing seat (16) is fixed to the lower end of the inner wall of the housing II (11). A sealing seat (16) is provided, the boss I on the upper outer wall of the lower expansion cone tie rod (7) is placed in the housing II (11) and sits on the sealing seat (16), the lower end of the piston rod II (12) is placed in the groove II on the upper end of the lower expansion cone tie rod (7) and is threadedly connected thereto, the boss II on the upper outer wall of the piston rod II (12) sits on the lower sealing seat (15), the lower end of the piston rod I (9) is placed in the groove III on the upper end of the piston rod II (12) and is threadedly connected thereto, the upper end is placed outside the housing I (8) and is connected to the drilling tool; a piston I (10) is provided on the lower outer wall of the piston rod I (9), and a piston II (13) is provided on the lower outer wall of the piston rod II (12).

3. The salvageable expansion pipe reinforcement device according to claim 2 is characterized in that A pressure channel I (17) is coaxially provided in the piston rod I (9), and a pressure channel II (18) is coaxially provided in the piston rod II (12), and the pressure channel I (17) and the pressure channel II (18) are connected.

4. The salvageable expansion pipe reinforcement device according to claim 2 is characterized in that A pressure outlet hole I (19) is provided around the outer wall of the piston rod I (9) below the piston I (10), and a pressure outlet hole II (20) is provided around the outer wall of the piston rod II (12) below the piston II (13). The pressure outlet hole I (19) is connected to the pressure channel I (17), and the pressure outlet hole II (20) is connected to the pressure channel II (18).

5. The salvageable expansion pipe reinforcement device according to claim 1, characterized in that A rubber sealing ring I (21) is sleeved on the outer wall of the upper expansion tube body (3), and a rubber sealing ring II (22) is sleeved on the outer wall of the lower expansion tube body (4).

6. The salvageable expandable pipe reinforcement device according to claim 2 is characterized in that at least one groove IV is provided around the inner wall of the upper sealing seat (14), the lower sealing seat (15) and the sealing seat (16), and a sealing ring I (23) is provided in the groove IV.

7. The salvageable expansion pipe reinforcement device according to claim 2 is characterized in that The outer walls of the pistons I (10) and II (13) are provided with one or more grooves V around their circumferences, and a sealing ring II (25) is provided in the grooves V.

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