Hydraulic device for releasing, patching and shaping oil and gas well casing

Abstract

The utility model discloses a hydraulic device for unfreezing, patching and reshaping an oil and gas well casing, which comprises a lifting hydraulic cylinder, a first series hydraulic cylinder and a second series hydraulic cylinder which are sequentially connected in series, a movable lifting rod is arranged in the lifting hydraulic cylinder, and the lifting rod is connected with the first series hydraulic cylinder and the second series hydraulic cylinder. One end of the lifting rod is connected with a descending pipe column, a gear shifting box, a gear shifting key and a gear shifting ring are arranged in the lifting hydraulic cylinder, the gear shifting box, the gear shifting key and the gear shifting ring are hung at the other end of the lifting rod through a lifting key, a reset connecting rod is hung on the gear shifting key, one end of the reset connecting rod is located in the lifting rod, and the other end of the reset connecting rod is located in the lifting hydraulic cylinder. According to the hydraulic device for oil and gas well casing pipe jam releasing, patching and shaping, three kinds of work including underground hydraulic force increasing salvage jam releasing, underground casing pipe patching and underground casing pipe shaping can be completed through one hydraulic cylinder, the construction cost is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas well construction, in particular to a hydraulic device for unblocking, patching and shaping oil and gas well casing. Background Art

[0002] In all existing downhole hydraulic cylinder technology designs, each process technology is constructed with a separate dedicated hydraulic cylinder assembly. For example, high-pressure casing patching technology must be a separate supporting hydraulic cylinder assembly for casing patching. The supporting hydraulic cylinder assembly cannot meet the requirements of the second downhole hydraulic booster salvage and unstuck work. The downhole hydraulic booster unstuck hydraulic cylinder also cannot meet the requirements of the second downhole casing patching work, increasing the downhole tool processing cost and the on-site construction cost of the oil and gas well.

[0003] In addition, the existing force-enhancing unstuck salvage technology is that the anchor is assembled at the upper end of the hydraulic cylinder. During the salvage process, only the single hydraulic tension of the hydraulic cylinder acts on the salvage spear at the lower end of the salvage joint, and the ground workover machine has no effect, which increases the damage to the inner wall of the casing and shortens its service life. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a hydraulic device for unjamming, patching and shaping the casing of an oil and gas well. Through a single hydraulic cylinder, three tasks of downhole hydraulic booster fishing and unjamming, downhole casing patching and downhole casing shaping can be completed respectively, thereby reducing construction costs and effectively solving the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a hydraulic device for unjamming, patching and shaping oil and gas well casing, comprising a lifting cylinder, a first series hydraulic cylinder and a second series hydraulic cylinder, the lifting cylinder, the first series hydraulic cylinder and the second series hydraulic cylinder are connected in series in sequence, a movable lifting rod is provided in the lifting cylinder, and one end of the lifting rod is connected to the downhole pipe string.

[0006] As an optimal technical solution of the present invention, a shift box, a shift key and a shift ring are provided in the lifting cylinder, and the other end of the lifting rod is suspended with the shift box, the shift key and the shift ring through the lifting key, and a reset link is suspended on the shift key, one end of the reset link is located in the lifting rod, and the reset link is switched in the long and short tracks through the shift key and the shift ring to achieve free movement.

[0007] As an optimal technical solution of the present invention, the reset connecting rod is connected to the piston connecting rod through a Yuanbao key, the piston connecting rod is located in the first series liquid cylinder and the second series liquid cylinder, and the other end of the piston connecting rod is connected to the piston through an elastic retaining ring and a Yuanbao ring.

[0008] As a preferred technical solution of the present invention, a pressure transmission tube is provided on one side of the piston connecting rod and the reset connecting rod.

[0009] As a preferred technical solution of the present invention, the lifting rod is installed in the lifting cylinder through a lifting cap.

[0010] As a preferred technical solution of the present invention, a valve seat is provided in the lifting rod, and a pressure relief valve core and a spring are installed in the valve seat.

[0011] As a preferred technical solution of the present invention, a filter sleeve is installed in the valve seat.

[0012] Compared with the existing technology, the beneficial effects of the present invention are: the hydraulic device for unjamming, patching and shaping the casing of the oil and gas well is reasonably designed and ingeniously conceived. A set of hydraulic cylinder assemblies is formed by lifting the hydraulic cylinder, the first series hydraulic cylinder and the second series hydraulic cylinder to respectively complete the three tasks of downhole hydraulic force-boosting salvage and unjamming, downhole casing patching, and downhole casing shaping, effectively reducing the downhole tool processing cost, significantly reducing the on-site construction cost of the oil and gas well, improving construction efficiency, reducing the construction operation links and tool assembly links, enhancing construction safety and reliability, and at the same time reducing damage to the inner wall of the casing and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the long and short tracks at A in the middle;

[0015] Figure 3 This is a schematic diagram of the assembly of the card release tool of the utility model;

[0016] Figure 4 This is a schematic diagram of the assembly shaping tool of the utility model;

[0017] Figure 5 This is a schematic diagram of the assembly subsidy tool of the utility model.

[0018] In the figure: 1 lifting rod, 2 pressure relief valve core, 3 spring, 4 filter sleeve, 5 valve seat, 6 lifting cap, 7 lifting cylinder, 8 reset connecting rod, 9 lifting key, 10 shift box, 11 shift key, 12 shift ring, 13 Yuanbao key, 14 piston connecting rod, 15 pressure transmission pipe, 16 first series cylinder, 17 elastic retaining ring, 18 Yuanbao ring, 19 piston, 20 second series cylinder, 21 de-carding connecting rod, 22 transition joint, 23 shaping connecting rod, 24 radial tube expander, 25 subsidy connecting rod, 26 bridge connection. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-2 The utility model provides a technical solution: a hydraulic device for unblocking, patching, and shaping oil and gas well casing, comprising a lifting cylinder 7, a first series hydraulic cylinder 16, and a second series hydraulic cylinder 20, which are sequentially connected in series. A movable lifting rod 1 is provided in the lifting cylinder 7, and one end of the lifting rod 1 is connected to the downhole pipe string;

[0021] A shift box 10, a shift key 11 and a shift ring 12 are provided in the lifting cylinder 7. The other end of the lifting rod 1 is suspended with the shift box 10, the shift key 11 and the shift ring 12 through the lifting key 9. A reset connecting rod 8 is suspended on the shift key 11. One end of the reset connecting rod 8 is located in the lifting rod 1. The reset connecting rod 8 is switched in the long and short tracks by the shift key 11 and the shift ring 12 to achieve free movement. The reset connecting rod 8 is connected to the piston connecting rod 14 through the Yuanbao key 13. The piston connecting rod 14 is located in the first series hydraulic cylinder 16 and the second series hydraulic cylinder 20. The other end of the piston connecting rod 14 is connected to the piston 19 through the elastic retaining ring 17 and the Yuanbao ring 18.

[0022] Furthermore, a pressure transmission tube 15 is provided on one side of the piston connecting rod 14 and the reset connecting rod 8, and the pressure transmission tube 15 plays a role in transmitting pressure.

[0023] In order to facilitate the installation of the lifting rod 1 , the lifting rod 1 is installed in the lifting cylinder 7 through the lifting cap 6 .

[0024] Furthermore, a valve seat 5 is provided in the lifting rod 1, and a pressure relief valve core 2 and a spring 3 are installed in the valve seat 5 to release the liquid in the tubing string when the tubing string is raised or lowered.

[0025] Furthermore, in order to filter impurities in the downhole tubing, a filter sleeve 4 is installed in the valve seat 5 .

[0026] like Figure 3As shown, the hydraulic device is used for force-enhanced jamming: the second series hydraulic cylinder 20 is assembled into a force-enhanced jamming-releasing salvage device through the jamming-releasing connecting rod 21, the transition joint 22, the anchor and the salvage joint. During the salvage process, the lifting force of the ground workover rig acts on the lifting rod 1 through the salvage string. The lifting force of the hydraulic device and the lifting force of the ground workover rig act on the salvage spear at the lower end of the salvage joint completely and simultaneously. In addition, the ground workover rig can observe and control the downhole salvage process at any time, which solves the technical problem that the ground equipment cannot operate the existing force-enhancing jamming-releasing device because the anchor is assembled at the upper end of the hydraulic cylinder.

[0027] At the same time, after the anchor is assembled on the hydraulic device, it can be controlled by the salvage pipe string, and the hydraulic device and the ground workover rig lifting force work together to lift it upward. The salvage and unstuck process increases the lifting force of the ground equipment, while reducing the working pressure of the hydraulic cylinder to reduce the anchoring force of the anchor on the inner wall of the casing, thereby reducing damage to the inner wall of the casing.

[0028] like Figure 4 As shown, when shaping is required: the second series hydraulic cylinder 20 is assembled into a hydraulic radial casing expander through the shaping connecting rod 23 and the radial expander 24 to shape the casing.

[0029] like Figure 5 As shown, when compensation is required: the second series hydraulic cylinder 20 is assembled with the compensation connecting rod 25 and the bridge connection 26 to form an oil and gas well casing compensation tool.

[0030] The utility model uses a unified hydraulic cylinder during casing unblocking, patching and shaping operations, effectively reducing downhole tool processing costs, significantly reducing on-site oil and gas well construction costs, improving construction efficiency, reducing construction operation links and tool assembly links, and enhancing construction safety and reliability.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic device for unblocking, patching and shaping oil and gas well casing, characterized by: The invention comprises a lifting cylinder (7), a first series hydraulic cylinder (16) and a second series hydraulic cylinder (20), wherein the lifting cylinder (7), the first series hydraulic cylinder (16) and the second series hydraulic cylinder (20) are sequentially connected in series, and a movable lifting rod (1) is provided in the lifting cylinder (7), and one end of the lifting rod (1) is connected to the downhole pipe string.

2. A hydraulic device for unblocking, patching, and shaping oil and gas well casing according to claim 1, characterized in that: A shift box (10), a shift key (11) and a shift ring (12) are arranged in the lifting cylinder (7); the other end of the lifting rod (1) is suspended with the shift box (10), the shift key (11) and the shift ring (12) via the lifting key (9); a reset connecting rod (8) is suspended on the shift key (11); one end of the reset connecting rod (8) is located in the lifting rod (1); the reset connecting rod (8) is switched between the long and short tracks via the shift key (11) and the shift ring (12) to achieve free movement.

3. A hydraulic device for unblocking, patching and shaping oil and gas well casing according to claim 2, characterized in that: The reset connecting rod (8) is connected to the piston connecting rod (14) through a Yuanbao key (13); the piston connecting rod (14) is located in the first series liquid cylinder (16) and the second series liquid cylinder (20); the other end of the piston connecting rod (14) is connected to the piston (19) through an elastic retaining ring (17) and a Yuanbao ring (18).

4. A hydraulic device for unblocking, patching, and shaping oil and gas well casing according to claim 3, characterized in that: A pressure transmission tube (15) is provided on one side of the piston connecting rod (14) and the reset connecting rod (8).

5. The hydraulic device for unblocking, patching and shaping oil and gas well casing according to claim 1, characterized in that: The lifting rod (1) is installed in the lifting liquid cylinder (7) through a lifting cap (6).

6. A hydraulic device for unblocking, patching, and shaping oil and gas well casing according to claim 1 or 5, characterized in that: A valve seat (5) is provided in the lifting rod (1), and a pressure relief valve core (2) and a spring (3) are installed in the valve seat (5).

7. The hydraulic device for unblocking, patching and shaping oil and gas well casing according to claim 6, characterized in that: A filter sleeve (4) is installed in the valve seat (5).

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