Hydraulic fishing tool

Abstract

The hydraulic device is provided with an inner cylinder, a conversion cylinder and an outer cylinder which are sequentially arranged inside and outside in a sleeving mode, the top of the outer cylinder is provided with a liquid inlet channel communicated with an oil pipe, a piston is arranged in an inner cavity of the inner cylinder, and the piston divides the inner cavity of the inner cylinder into an upper end cavity and a lower end cavity in the direction from a well mouth to a well bottom; the upper end cavity is communicated with the liquid inlet channel, and a first liquid cavity communicated with the liquid inlet channel and a second liquid cavity communicated with the lower end cavity are formed between the conversion barrel and the outer barrel in a dividing mode. The expansion plate element is movably arranged on the hydraulic press in a penetrating mode in the radial direction of the inner cylinder, a clamping part used for clamping a fish is formed at one end of the expansion plate element, and the other end of the expansion plate element is movably connected with the piston; the conversion barrel can move between the first position and the second position in the axial direction of the inner barrel. The hydraulic fishing tool solves the problems that an existing fishing tool used in oil and gas well fishing operation is tedious in operation process, low in operation efficiency, prone to loss and prone to secondary disengagement.

Description

Technical Field

[0001] The invention relates to the technical field of downhole salvage equipment, and in particular to a hydraulic salvage tool. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] Oil and gas production plays a huge role in economic development. However, during the drilling and downhole operations, the increased drilling depth and complex downhole environment make it very easy for fish to fall in. Drilling salvage tools are needed for salvage, but existing salvage tools have defects such as low operating efficiency, cumbersome operation procedures, and easy damage. They are also prone to secondary shedding.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The purpose of the present invention is to provide a hydraulic fishing tool, which solves the problems of complicated operation process, low operation efficiency, easy loss and easy secondary falling of the fishing tools used in the existing oil and gas well fishing operations.

[0006] The above-mentioned implementation objectives of the present invention are mainly achieved by the following technical solutions:

[0007] The present invention provides a hydraulic fishing tool, comprising:

[0008] A hydraulic device, comprising an inner cylinder, a conversion cylinder, and an outer cylinder which are sequentially sleeved inside and outside, a liquid inlet passage connected to an oil pipe being provided at the top of the outer cylinder, a piston being provided in the inner cavity of the inner cylinder, the piston dividing the inner cavity of the inner cylinder into an upper end cavity and a lower end cavity along the direction from the wellhead to the bottom of the well, the upper end cavity being connected to the liquid inlet passage, a first liquid cavity connected to the liquid inlet passage and a second liquid cavity connected to the lower end cavity being formed between the conversion cylinder and the outer cylinder;

[0009] An expansion plate element is movably arranged in the hydraulic device along the radial direction of the inner cylinder, one end of the expansion plate element is formed with a clamping portion for clamping the falling fish, and the other end of the expansion plate element is movably connected to the piston;

[0010] The conversion cylinder can move between a first position and a second position along the axial direction of the inner cylinder, wherein when the conversion cylinder is located at the first position, the pressure liquid located in the upper end chamber can push the piston to move toward the bottom of the well and the piston can push the expansion plate element to move radially outward along the inner cylinder, and when the conversion cylinder is located at the second position, the first liquid chamber and the second liquid chamber are connected, the pressure liquid located in the lower end chamber can push the piston to move back toward the wellhead and the piston can pull the expansion plate element to move radially inward along the inner cylinder.

[0011] In a specific embodiment,

[0012] A piston cone wall is formed on one side of the piston facing the expansion plate element, and an expansion plate cone wall is formed on one end of the expansion plate element facing the piston, and the piston cone wall is correspondingly fitted with the expansion plate cone wall and can be movably engaged;

[0013] Among them, when the piston moves toward the bottom of the well, the piston cone wall moves along the expansion plate cone wall toward the bottom of the well to push the expansion plate element to move radially outward along the inner tube; when the piston moves toward the wellhead, the piston cone wall moves along the expansion plate cone wall toward the wellhead to pull the expansion plate element to move radially inward along the inner tube.

[0014] In a specific embodiment,

[0015] The hydraulic press also includes a mosaic structure, which has a groove part and a protrusion part that can be embedded in each other and move relatively, wherein the groove part is formed on the piston cone wall, and the protrusion part is formed on the expansion plate cone wall, or the groove part is formed on the expansion plate cone wall, and the protrusion part is formed on the piston cone wall.

[0016] In a specific embodiment,

[0017] An infusion channel is provided at the top of the inner tube, and the infusion channel is connected to the liquid inlet channel and the upper end cavity respectively. A one-way liquid blocking component is provided on the top of the upper end cavity, and the one-way liquid blocking component can move toward or away from the infusion channel to block the infusion channel or make the infusion channel communicate with the upper end cavity.

[0018] In a specific embodiment,

[0019] The one-way liquid blocking component includes a plugging head and a first elastic member, the inner cavity of the plugging head is connected to the upper end cavity, a plurality of plugging holes are opened on the side wall of the plugging head, the plugging holes are respectively connected to the infusion channel and the upper end cavity, and the first elastic member is connected between the inner wall of the inner tube and the plugging head;

[0020] Wherein, when the pressure of the upper end cavity is greater than the pressure of the liquid inlet channel, the pressure liquid located in the liquid inlet channel can enter the upper end cavity through the infusion channel and the plug hole in sequence, and when the pressure of the upper end cavity is equal to the pressure of the liquid inlet channel, the first elastic member can push the plugging head to block the infusion channel.

[0021] In a specific embodiment,

[0022] A first pressure relief hole is provided on the side wall of the inner cylinder, a second pressure relief hole is provided on the side wall of the conversion cylinder, and a third pressure relief hole is provided on the side wall of the outer cylinder. When the conversion cylinder is located at the second position, the first pressure relief hole, the second pressure relief hole, and the third pressure relief hole are connected in sequence so that the pressure liquid in the upper end cavity can flow out from the first pressure relief hole, the second pressure relief hole, and the third pressure relief hole.

[0023] In a specific embodiment,

[0024] A liquid passage is provided at the upper end of the conversion cylinder, and the liquid passage is connected to the liquid inlet channel and the liquid infusion channel respectively. A ball seat is provided in the liquid passage, and a blocking ball dropped from the oil pipe can block the ball seat. When the liquid passage is blocked, the pressure liquid in the liquid inlet channel can push the conversion cylinder to move from the first position to the second position.

[0025] In a specific embodiment,

[0026] The hydraulic press further comprises a second elastic member, which is connected between the bottom of the conversion cylinder and the inner cylinder and is used for pushing the conversion cylinder to return to the first position.

[0027] In a specific embodiment,

[0028] The bottom of the conversion cylinder is concavely formed with a first limiting groove, and the inner cylinder is convexly formed with a second limiting groove along its own radial outward direction. The hydraulic press also includes a limiting block, one end of the limiting block is inserted into the first limiting groove, and the other end of the limiting block is inserted into the second limiting groove, so as to limit the relative rotation of the conversion cylinder and the inner cylinder.

[0029] In a specific embodiment,

[0030] The clamping portion includes a plurality of clamping teeth, and the plurality of clamping teeth are arranged at intervals along an end surface of the expansion plate element facing the outside of the hydraulic salvage tool.

[0031] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0032] 1. The hydraulic salvage tool provided by the present invention can realize the function of pushing the expansion plate element to move radially outward along the inner tube by only relying on the hydraulic pressure injected into the oil pipe from the ground. Compared with the existing clamping type salvage tools, the expansion plate element that moves radially outward along the inner tube is clamped on the fallen fish. As long as the pressure is not released, the expansion plate element can be stably clamped. At the same time, the expansion plate element is clamped by hydraulic pressure. Even when salvaging fallen fish in a pipe, the pipe mouth of the fallen fish is expanded by the expansion plate. As long as the hydraulic pressure injected from the ground remains stable, the expansion plate can continue to move outward and clamp on the deformed fallen fish, thereby ensuring the clamping stability of the expansion plate element and the fallen fish and avoiding the occurrence of secondary fish falling.

[0033] 2. The hydraulic salvage tool provided by the present invention adopts a structural design of a movable conversion cylinder. When the conversion cylinder is in the first position, positive circulation can be achieved through the downward hydraulic pressure provided by the wellhead, that is, the piston is pushed from the upper end chamber, and then the expansion plate element is pushed to move outward to engage the fallen fish. When the conversion cylinder is in the second position, the downward hydraulic pressure provided by the wellhead can enter the lower end chamber, and by pushing the piston upward, the expansion plate element is driven to shrink and move inward to disengage from the fallen fish, that is, the resetting effect of the hydraulic salvage tool is achieved. The hydraulic salvage tool provided by the present invention realizes the two functions of integrated engagement and resetting in one component, thereby improving the usability of the hydraulic salvage tool.

[0034] 3. The hydraulic salvage tool provided by the present invention realizes the whole salvage process with only one column lowering, thereby improving the salvage efficiency. At the same time, compared with the existing salvage tools, the hydraulic salvage tool provided by the present invention has a simplified structure, good maintainability, high durability, and relatively simple maintenance and replacement of parts.

[0035] 4. Since fish of different sizes may require cava salvage tubes of different sizes, there are many tools and it is difficult to achieve salvage at one time in a complex environment, the hydraulic salvage tool provided by the present invention can salvage fish of various sizes, including column-type fish and cylinder-type fish. Compared with existing salvage parts, it has a stable structure and fewer parts, avoiding the risk of more parts causing easier damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0037] Figure 1 It is a structural cross-sectional view of the hydraulic fishing tool of the present invention;

[0038] Figure 2 is a side view of the hydraulic fishing tool of the present invention;

[0039] Figure 3 It is a structural diagram of the hydraulic fishing tool of the present invention;

[0040] Figure 4 is a cross-sectional view of the outer cylinder of the hydraulic fishing tool of the present invention;

[0041] Figure 5 A cross-sectional view of a conversion barrel of a hydraulic fishing tool of the present invention;

[0042] Figure 6 It is a cross-sectional view of the inner cylinder of the hydraulic fishing tool of the present invention.

[0043] Description of Figure Numbers:

[0044] 100. Hydraulic press;

[0045] 110, inner tube; 111, upper end cavity; 112, lower end cavity; 113, infusion channel; 114, first pressure relief hole; 115, second limiting groove;

[0046] 120, conversion cylinder; 121, second pressure relief hole; 122, liquid passage; 1221, ball seat; 123, second elastic member; 124, first limiting groove;

[0047] 130. outer cylinder; 131. liquid inlet channel; 132. third pressure relief hole;

[0048] 141, first liquid chamber; 142, second liquid chamber;

[0049] 150, interlocking structure; 151, groove member; 152, convex block member;

[0050] 160, limit block;

[0051] 200, piston; 210, piston cone wall;

[0052] 300, expansion plate element; 310, clamping portion; 311, clamping teeth; 320, expansion plate cone wall;

[0053] 400, one-way liquid blocking component; 410, plugging head; 411, plugging hole; 420, first elastic member;

[0054] 500, sealing ring;

[0055] 600, O-ring;

[0056] 700, sealing cover;

[0057] F. Axial direction of the inner tube;

[0058] D. Radial direction of the inner cylinder. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0060] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0062] like Figures 1 to 6 As shown, the present invention provides a hydraulic fishing tool, comprising:

[0063] The hydraulic press 100 comprises an inner cylinder 110, a conversion cylinder 120, and an outer cylinder 130 which are sequentially sleeved inside and outside. A liquid inlet passage 131 connected to the oil pipe is provided at the top of the outer cylinder 130. A piston 200 is provided in the inner cavity of the inner cylinder 110. The piston 200 divides the inner cavity of the inner cylinder 110 into an upper end chamber 111 and a lower end chamber 112 along the direction from the wellhead to the bottom of the well. The upper end chamber 111 is connected to the liquid inlet passage 131. A first liquid chamber 141 connected to the liquid inlet passage 131 and a second liquid chamber 142 connected to the lower end chamber 112 are formed between the conversion cylinder 120 and the outer cylinder 130.

[0064] The expansion plate element 300 is movably disposed in the hydraulic device 100 along the radial direction D of the inner cylinder 110. A clamping portion 310 for clamping the falling fish is formed at one end of the expansion plate element 300, and the other end of the expansion plate element 300 is movably connected to the piston 200.

[0065] The conversion cylinder 120 can move between a first position and a second position along the axial direction F of the inner cylinder 110, wherein when the conversion cylinder 120 is located at the first position, the pressure liquid located in the upper end chamber 111 can push the piston 200 to move toward the bottom of the well and the piston 200 can push the expansion plate element 300 to move outward along the radial direction D of the inner cylinder 110, and when the conversion cylinder 120 is located at the second position, the first liquid chamber 141 and the second liquid chamber 142 are connected, and the pressure liquid located in the lower end chamber 112 can push the piston 200 to move back toward the wellhead and the piston 200 can pull the expansion plate element 300 to move inward along the radial direction D of the inner cylinder 110.

[0066] The hydraulic salvage tool provided by the present invention can push the expansion plate element 300 to move outward along the radial direction D of the inner tube 110 by only relying on the hydraulic pressure injected into the oil pipe from the ground. Compared with the existing clamping type salvage tools, the expansion plate element 300 that moves outward along the radial direction of the inner tube is clamped on the fallen fish. As long as the pressure is not released, the expansion plate element 300 can be stably clamped. At the same time, the expansion plate element 300 is pushed to clamp. Even when salvaging pipe-like fallen fish, the pipe mouth of the fallen fish is expanded by the expansion plate. As long as the hydraulic pressure injected from the ground remains stable, the expansion plate can continue to move outward and clamp on the deformed fallen fish, thereby ensuring the clamping stability of the expansion plate element 300 and the fallen fish and avoiding the occurrence of secondary fish falling.

[0067] The hydraulic salvage tool provided by the present invention adopts a structural design of a movable conversion cylinder 120. When the conversion cylinder 120 is in the first position, positive circulation can be achieved through the downward hydraulic pressure provided by the wellhead, that is, the piston 200 is pushed from the upper end chamber 111, and then the expansion plate element 300 is pushed to move outward to engage the fallen fish. When the conversion cylinder 120 is in the second position, the downward hydraulic pressure provided by the wellhead can enter the lower end chamber 112, and by pushing the piston 200 upward, the expansion plate element 300 is driven to shrink and move inward to disengage from the fallen fish, that is, the resetting effect of the hydraulic salvage tool is achieved. The hydraulic salvage tool provided by the present invention realizes the two functions of integrated engagement and resetting in one component, thereby improving the usability of the hydraulic salvage tool.

[0068] The hydraulic salvage tool provided by the present invention can realize the whole salvage process by lowering the column only once, thereby improving the salvage efficiency. At the same time, compared with the existing salvage tools, the hydraulic salvage tool provided by the present invention has a simplified structure, good maintainability, high durability of the salvage tool, and relatively simple maintenance and replacement of parts.

[0069] Since fish of different sizes may require cava salvage tubes of different sizes, there are many tools and it is difficult to achieve salvage at one time in a complex environment, the hydraulic salvage tool provided by the present invention can salvage fish of various sizes, including column-type fish and cylinder-type fish. Compared with existing salvage parts, it has a stable structure and fewer parts, thus avoiding the risk of more parts causing easier damage.

[0070] Specifically in this embodiment, the inner cylinder 110, the conversion cylinder 120 and the outer cylinder 130 are all cylindrical structures. In each embodiment of this document, unless otherwise specified, the direction close to the wellhead is referred to as the upper side, and the direction close to the bottom of the well is referred to as the lower side.

[0071] In this embodiment, the lower ends of the inner cylinder 110 and the outer cylinder 130 are connected, and a sealing ring 500 is provided between the lower ends of the inner cylinder 110 and the outer cylinder 130 to seal the annulus between the inner cylinder 110 and the outer cylinder 130, and a sealing cover 700 is provided at the lower end of the inner cylinder 110 to seal the lower end of the inner cylinder 110; in another specific embodiment, the sealing ring 500 is provided with an external thread, the inner wall of the lower end of the outer cylinder 130 is provided with an internal thread, the sealing ring 500 and the outer cylinder 130 are threadedly connected, the inner ring of the sealing ring 500 is provided with an internal thread, the outer wall of the lower end of the inner cylinder 110 is provided with an external thread, and the sealing ring 500 and the inner cylinder 110 are threadedly connected, which ensures the fixed connection between the inner cylinder 110 and the outer cylinder 130 and improves the hydraulic salvage. The connection stability of the tool during the salvage process; in yet another embodiment, an O-ring 600 is provided at the connection between the outer cylinder 130 and the sealing ring 500, an O-ring 600 is provided at the connection between the sealing ring 500 and the inner cylinder 110, and an O-ring 600 is provided between the inner cylinder 110 and the sealing cover 700 to achieve the sealing of the annulus between the inner cylinder 110 and the outer cylinder 130 to prevent liquid from leaking from the gap between the inner cylinder 110 and the outer cylinder 130. In this embodiment, the annulus between the inner cylinder 110 and the outer cylinder 130 is connected to the second liquid chamber 142. At the same time, the lower end chamber 112 is also connected to the annulus between the inner cylinder 110 and the outer cylinder 130 through a plurality of through holes opened at the lower part of the inner cylinder 110.

[0072] In this embodiment, the length of the conversion cylinder 120 is shorter than the length of the inner cylinder 110 and the length of the outer cylinder 130, so that the conversion cylinder 120 can move between the inner cylinder 110 and the outer cylinder 130 along the axial direction F of the inner cylinder 110. In a specific embodiment, the upper inner wall of the outer cylinder 130 is provided with a boss protruding radially inward, and the lower outer wall of the inner cylinder 110 is provided with a boss protruding radially outward to limit the movement range of the conversion cylinder 120 between the inner cylinder 110 and the outer cylinder 130. In a specific embodiment, when the upper end of the conversion cylinder 120 is aligned with the boss of the outer cylinder 130, the conversion cylinder 120 is moved along the axial direction F of the inner cylinder 110. When abutting, the conversion cylinder 120 is located in the first position, and when the lower end of the conversion cylinder 120 abuts against the boss of the inner cylinder 110, the conversion cylinder 120 is located in the second position; in another embodiment, the upper inner wall of the conversion cylinder 120 is also formed with a boss protruding radially inward, and the boss of the conversion cylinder 120 can abut against the upper end of the inner cylinder 110 to achieve limiting. In this embodiment, when the lower end of the conversion cylinder 120 abuts against the boss of the inner cylinder 110, the boss of the conversion cylinder 120 abuts against the upper end of the inner cylinder 110, and the conversion cylinder 120 is located in the second position.

[0073] In this embodiment, the inner side of the outer cylinder 130 is closely fitted with the outer side of the conversion cylinder 120, and the inner side of the conversion cylinder 120 is closely fitted with the outer side of the inner cylinder 110. A first liquid chamber 141 close to the wellhead and a second liquid chamber 142 close to the well bottom are formed between the outer side of the conversion cylinder 120 and the inner side of the outer cylinder 130. When the conversion cylinder 120 is located at the first position, the first liquid chamber 141 and the second liquid chamber 142 are separated. When the conversion cylinder 120 is located at the second position, the first liquid chamber 141 and the second liquid chamber 142 are connected. In a specific embodiment, the number of the first liquid chamber 141 can be multiple, and the multiple first liquid chambers 141 are arranged at intervals along the circumference of the conversion cylinder 120. The number of the second liquid chamber 142 can also be multiple, and the multiple second liquid chambers 142 are arranged at intervals along the circumference of the conversion cylinder 120, and the first liquid chamber 141 and the second liquid chamber 142 are arranged correspondingly.

[0074] In this embodiment, two openings are provided at the lower end of the outer cylinder 130 and the same side of the lower end of the inner cylinder 110, and the expansion element 300 is movably arranged in the hydraulic cylinder 100 from the two openings, and one end of the expansion element 300 on the inner side along the radial direction D of the inner cylinder 110 is located in the inner cavity of the inner cylinder 110. In this embodiment, the movable connection between the expansion element 300 and the piston 200 can be that one end of the expansion element 300 located in the inner cylinder 110 is movably connected to the peripheral wall of the piston 200, and the expansion element 300 is driven to move outward or inward along the radial direction D of the inner cylinder 110 by the inner wall of the expansion element 300 and the outer wall of the piston 200. In another embodiment, the expansion element Component 300 can also be movably connected with piston 200 through a hydraulic structure, that is, when piston 200 moves downward or upward, the pressure of the hydraulic structure between the expansion element 300 and piston 200 is changed to push the expansion element 300 to move outward or inward along the radial direction D of the inner cylinder 110. In other embodiments, there is no restriction on the manner in which the expansion element 300 and the piston 200 are movably connected, and there is no restriction on the manner in which the piston 200 pushes the expansion element 300 to move. In a specific embodiment, the number of expansion elements 300 can be multiple, and the multiple expansion elements 300 are arranged at circumferential intervals along the inner cylinder 110, and there is no specific restriction on the number of expansion elements 300.

[0075] In this embodiment, the plate expansion element 300 is formed with a clamping portion 310 along the radial outer side D of the inner cylinder 110, and the clamping portion 310 can abut against the outer wall of the outer cylinder 130. When the piston 200 moves downward along the axial direction F of the inner cylinder 110, the piston 200 can push the plate expansion element 300 to move outward along the radial direction D of the inner cylinder 110, so that the clamping portion 310 moves outward along the radial direction D of the inner cylinder 110 and clamps on the fallen fish; when the piston 200 moves upward along the axial direction F of the inner cylinder 110, the piston 200 can drive the plate expansion element 300 to move inward along the radial direction D of the inner cylinder 110, so that the clamping portion 310 moves inward along the radial direction D of the inner cylinder 110 and abuts against the outer wall of the outer cylinder 130.

[0076] like Figure 1 As shown, in one specific embodiment,

[0077] A piston cone wall 210 is formed on one side of the piston 200 facing the expansion plate element 300, and an expansion plate cone wall 320 is formed on one end of the expansion plate element 300 facing the piston 200. The piston cone wall 210 and the expansion plate cone wall 320 are correspondingly fitted and movably connected;

[0078] Among them, when the piston 200 moves toward the bottom of the well, the piston cone wall 210 moves toward the bottom of the well along the expansion plate cone wall 320 to push the expansion plate element 300 to move outward along the radial direction D of the inner tube 110; when the piston 200 moves toward the wellhead, the piston cone wall 210 moves along the expansion plate cone wall 320 toward the wellhead to pull the expansion plate element 300 to move inward along the radial direction D of the inner tube 110.

[0079] The hydraulic fishing tool provided in this embodiment has a piston cone wall 210 that drives the expansion plate element 300 to move outward or inward along the radial direction D of the inner cylinder 110, wherein the piston 200 is realized by abutting and clamping the piston cone wall 210 with the expansion plate cone wall 320.

[0080] Specifically in the present embodiment, the piston cone wall 210 is formed at one end of the piston 200 close to the expansion plate element 300, and the piston cone wall 210 is tilted downward along the axial direction F of the inner cylinder 110 and toward the axis of the inner cylinder 110, wherein the high point of the piston cone wall 210 along the radial direction of the piston 200 is close to the wellhead side, and the low point of the piston cone wall 210 along the radial direction of the piston 200 is close to the bottom of the well, and the expansion plate cone wall 320 is formed at one end of the expansion plate element 300 close to the piston 200, and the expansion plate cone wall 320 is tilted downward along the axial direction F of the inner cylinder 110 and toward the axis of the inner cylinder 110, wherein the angle between the expansion plate cone wall 320 and the axis of the inner cylinder 110 is the same as the angle between the piston cone wall 210 and the axis of the inner cylinder 110, so that the expansion plate cone wall 320 and the piston cone wall 210 are correspondingly fitted.

[0081] In the present embodiment, when the piston 200 moves toward the bottom of the well, the piston cone wall 210 slides downward along the expansion plate cone wall 320 to abut and push the expansion plate element 300 to move outward along the radial direction D of the inner tube 110 and clamp onto the fallen fish; in the present embodiment, when the piston 200 moves toward the wellhead, the piston cone wall 210 slides upward along the expansion plate cone wall 320, and the clamping relationship between the piston cone wall 210 and the expansion plate cone wall 320 is used to drive the expansion plate element 300 to move inward along the radial direction D of the inner tube 110.

[0082] like Figure 1 As shown, in one specific embodiment,

[0083] The hydraulic press 100 also includes a mosaic structure 150, which has a groove part 151 and a protrusion part 152 that can be embedded in each other and move relative to each other, wherein the groove part 151 is formed on the piston cone wall 210, and the protrusion part 152 is formed on the expansion plate cone wall 320, or the groove part 151 is formed on the expansion plate cone wall 320, and the protrusion part 152 is formed on the piston cone wall 210.

[0084] The hydraulic salvage tool provided in this embodiment can ensure that the expansion plate cone wall 320 and the piston cone wall 210 can maintain a stable fitting relationship when the piston 200 moves toward the bottom of the well or when the piston 200 moves toward the wellhead by setting the interlocking structure 150.

[0085] Specifically in this embodiment, when the piston 200 moves toward the bottom of the well, the piston cone wall 210 slides downward along the expansion plate cone wall 320 to abut and push the expansion plate element 300 to move outward along the radial direction D of the inner tube 110 and clamp onto the fallen fish. When the piston 200 moves toward the wellhead, the piston cone wall 210 slides upward along the expansion plate cone wall 320 through the interlocking structure 150 to drive the expansion plate element 300 to move inward along the radial direction D of the inner tube 110.

[0086] In a specific embodiment, the length of the groove member 151 is determined according to the angle between the piston cone wall 210 and the axis of the inner cylinder 110. Limiting protrusions are provided at both ends of the groove member 151 to limit the distance that the expansion element 300 moves outward along the radial direction D of the inner cylinder 110. In the application of an actual specification tool, the expansion element 300 moves outward along the radial direction D of the inner cylinder 110 by 1 cm for every 5.6 cm downward movement of the piston 200. In another specific embodiment, the total distance that the piston 200 can move downward is 35 cm, and the total distance that the expansion element 300 can move outward is 6.25 cm. No specific limitation is made to this.

[0087] like Figure 1 and Figure 4 As shown, in one specific embodiment,

[0088] An infusion channel 113 is provided at the top of the inner tube 110, and the infusion channel 113 is connected to the liquid inlet channel 131 and the upper end cavity 111 respectively. A one-way liquid blocking component 400 is provided at the top of the upper end cavity 111. The one-way liquid blocking component 400 can move toward or away from the infusion channel 113 to block the infusion channel 113 or make the infusion channel 113 communicate with the upper end cavity 111.

[0089] The hydraulic salvage tool provided in this embodiment can block the upper end cavity 111 by setting the infusion channel 113 and the one-way liquid blocking component 400, thereby preventing the expansion element 300 from retracting and moving toward the direction close to the inner tube 110 and pushing the piston 200 to move upward when the expansion element 300 is subjected to abutment pressure, thereby preventing the fish from falling again.

[0090] Specifically in this embodiment, the one-way liquid blocking component 400 is connected to the inner wall of the inner tube 110 , and the one-way liquid blocking component 400 blocks the upper end cavity 111 by blocking the infusion channel 113 .

[0091] like Figure 1 As shown, in one specific embodiment,

[0092] The one-way liquid blocking assembly 400 includes a plugging head 410 and a first elastic member 420. The inner cavity of the plugging head 410 is connected to the upper end cavity 111. The side wall of the plugging head 410 is provided with a plurality of plugging holes 411, which are respectively connected to the infusion channel 113 and the upper end cavity 111. The first elastic member 420 is connected between the inner wall of the inner tube 110 and the plugging head 410.

[0093] In which, when the pressure of the upper end cavity 111 is greater than the pressure of the liquid inlet channel 131, the pressure liquid located in the liquid inlet channel 131 can enter the upper end cavity 111 through the infusion channel 113 and the plug hole 411 in sequence, and when the pressure of the upper end cavity 111 is equal to the pressure of the liquid inlet channel 131, the first elastic member 420 can push the plugging head 410 to block the infusion channel 113.

[0094] The hydraulic salvage tool provided in this embodiment can automatically adjust whether to block the upper end cavity 111 according to the pressure of the upper end cavity 111 by setting the blocking head 410 and the first elastic member 420. That is, when the pressure of the upper end cavity 111 is equal to the pressure of the liquid inlet channel 131, the first elastic member 420 can automatically push the blocking head 410 to block the infusion channel 113. Even if the pipe mouth of the fish is expanded by the expansion plate element 300 when salvaging a pipe fish, as long as the hydraulic pressure in the infusion channel 113 is continuously increased, the blocking head 410 can be pushed to move downward to expose the infusion channel 113, thereby increasing the liquid pressure in the upper end cavity 111, and the piston 200 continues to move downward. The expansion plate element 300 can also continue to move outward and clamp onto the fish, thereby ensuring the stability of the clamping connection with the fish and avoiding the occurrence of a second fish drop.

[0095] Specifically in the present embodiment, a cavity is formed inside the plugging head 410, and an opening is formed at the lower end of the plugging head 410, and the opening of the plugging head 410 is connected to the cavity of the plugging head 410. In the present embodiment, the infusion channel 113 is generally composed of a channel with a larger diameter and two channels with a smaller diameter, and the two channels with smaller diameters are connected to the upper and lower ends of the channel with a larger diameter, and the channel with a smaller diameter near the bottom of the well is connected to the upper end cavity 111, and the channel with a smaller diameter near the wellhead is connected to the liquid inlet channel 131, and the plugging head 410 is movably arranged in the infusion channel 113, wherein the lower part of the plugging head 410 is sealed and A movably arranged passage with a smaller diameter near the bottom of the well, a plug hole 411 is provided on the middle side wall of the plug head 410, the plug hole 411 is communicated with the cavity of the plug head 410, and when the plug head 410 moves upward, the plug head 410 can block the passage with a smaller diameter near the wellhead of the infusion channel 113, so as to block the infusion channel 113; in other embodiments, the plug head 410 can also be arranged in other ways, for example, the lower part of the plug head 410 is connected to the inner wall of the inner tube 110 through a foldable sealing software, so as to realize that the infusion channel 113 is connected to the upper end cavity 111 through the plug hole 411, and no specific limitation is made to this.

[0096] In a preferred embodiment, the total cross-sectional area of ​​the plurality of plugging holes 411 is equal to 0.2 times the cross-sectional area of ​​the channel with a smaller diameter near the wellhead, so that the pressure liquid can flow into the plugging holes 411 normally, avoiding the total cross-sectional area of ​​the plurality of plugging holes 411 being too small, resulting in pressure buildup in the infusion channel 113, affecting the normal movement of the plugging head 410, and also avoiding the total cross-sectional area of ​​the plurality of plugging holes 411 being too large, resulting in the plugging head 410 being more easily pushed by the first elastic member 420 to be blocked in the channel with a smaller diameter near the wellhead, making it impossible to achieve normal adjustment of the plugging head 410.

[0097] In the present embodiment, a channel with a smaller diameter near the bottom of the well is provided with a boss protruding inward along the radial direction D of the inner tube 110, one end of the first elastic member 420 is connected to the boss of the channel with a smaller diameter near the bottom of the well, and the other end of the first elastic member 420 extends from the opening of the plugging head 410 into the cavity of the plugging head 410 and abuts against the inner wall of the plugging head 410, so as to push the plugging head 410 to move in the direction of the channel with a smaller diameter near the wellhead; in other embodiments, the first elastic member 420 can also be connected to the inner wall of the inner tube 110 in other ways.

[0098] like Figure 1 , Figures 4 to 6 As shown, in one specific embodiment,

[0099] A first pressure relief hole 114 is provided on the side wall of the inner cylinder 110, a second pressure relief hole 121 is provided on the side wall of the conversion cylinder 120, and a third pressure relief hole 132 is provided on the side wall of the outer cylinder 130. When the conversion cylinder 120 is located at the second position, the first pressure relief hole 114, the second pressure relief hole 121, and the third pressure relief hole 132 are connected in sequence so that the pressure liquid in the upper end cavity 111 can flow out from the first pressure relief hole 114, the second pressure relief hole 121, and the third pressure relief hole 132.

[0100] The hydraulic salvage tool provided in this embodiment can avoid the problem that the liquid in the upper end chamber 111 cannot be compressed when the piston 200 moves upward due to the setting of the one-way liquid-blocking component 400, and the piston 200 cannot move upward. By setting the first pressure relief hole 114, the second pressure relief hole 121 and the third pressure relief hole 132, the pressure liquid in the upper end chamber 111 can be discharged when the first pressure relief hole 114, the second pressure relief hole 121 and the third pressure relief hole 132 are connected, so that the piston 200 can move upward normally, thereby driving the expansion plate element 300 to move inward along the radial direction D of the inner cylinder 110.

[0101] Specifically, in the present embodiment, there are multiple first pressure relief holes 114, and multiple first pressure relief holes 114 are arranged on the circumferential wall of the middle part of the inner cylinder 110 at intervals along the circumference of the inner cylinder 110. In the present embodiment, there are multiple second pressure relief holes 121, and multiple second pressure relief holes 121 are arranged on the circumferential wall of the lower part of the inner cylinder 110 at intervals along the circumference of the conversion cylinder 120. In the present embodiment, there are multiple third pressure relief holes 132, and multiple third pressure relief holes 132 are arranged on the circumferential wall of the middle part of the outer cylinder 130 at intervals along the circumference of the outer cylinder 130, wherein the arrangement positions of the first pressure relief holes 114, the second pressure relief holes 121, and the third pressure relief holes 132 correspond, and when the conversion cylinder 120 is in the second position, the first pressure relief holes 114, the second pressure relief holes 121, and the third pressure relief holes 132 are connected in sequence.

[0102] like Figure 1 and Figure 5 As shown, in one specific embodiment,

[0103] A liquid passage 122 is provided at the upper end of the conversion cylinder 120, and the liquid passage 122 is connected to the liquid inlet channel 131 and the liquid infusion channel 113 respectively. A ball seat 1221 is provided in the liquid passage 122, and a blocking ball dropped from the oil pipe can block the ball seat 1221. When the liquid passage 122 is blocked, the pressure liquid in the liquid inlet channel 131 can push the conversion cylinder 120 to move from the first position to the second position.

[0104] The hydraulic salvage tool provided in this embodiment has a ball seat 1221 in the liquid passage 122, and the ball seat 1221 is used to place a sealing ball. The sealing ball dropped from the oil pipe can be sealed on the ball seat 1221; in this embodiment, when the sealing ball falls onto the ball seat 1221, pressure is applied from the ground, and the upper opening of the liquid passage 122 is subjected to pressure. The sealing ball can form a sealed state with the liquid passage 122 under the action of pressure.

[0105] like Figure 1 As shown, by injecting liquid into the liquid passage 122 through the ground and applying pressure, the sealing ball and the liquid passage 122 are closed. At this time, as the liquid injection continues, the conversion cylinder 120 moves downward under the action of the injection pressure until the lower end of the conversion cylinder 120 abuts against the boss protruding outward in the radial direction D of the inner cylinder 110. At this time, the conversion cylinder 120 is in the second position, and the first liquid chamber 141 and the second liquid chamber 142 are connected. The pressure liquid injected from the wellhead flows into the lower end chamber 112 through the first liquid chamber 141 and the second liquid chamber 142, thereby pushing the piston 200 to move upward, thereby realizing the resetting of the expansion element 300 and the inward movement along the radial direction D of the inner cylinder 110.

[0106] like Figure 1 As shown, in one specific embodiment,

[0107] The hydraulic press 100 further includes a second elastic member 123 , which is connected between the bottom of the conversion cylinder 120 and the inner cylinder 110 , and is used to push the conversion cylinder 120 to return to the first position.

[0108] The hydraulic salvage tool provided in this embodiment can facilitate the movement of the conversion cylinder 120 from the second position to the first position by providing the second elastic member 123. That is, after the fish salvage process is completed, the sealing ball can be washed out by backwashing, and then, under the premise that the conversion cylinder 120 is not subjected to downward pressure, the second elastic member 123 can push the conversion cylinder 120 to reset, thereby facilitating the next fish salvage and improving the salvage efficiency.

[0109] Specifically in this embodiment, one end of the second elastic member 123 is connected to a boss protruding outward in the radial direction D of the inner cylinder 110, and the other end of the second elastic member 123 is connected to the lower end of the conversion cylinder 120 to push the conversion cylinder 120 along the axial direction F of the inner cylinder 110 toward the first position.

[0110] like Figure 1 and Figure 5 As shown, in one specific embodiment,

[0111] A first limiting groove 124 is formed at the bottom of the conversion cylinder 120, and a second limiting groove 115 is formed on the inner cylinder 110 along its own radial outward projection. The hydraulic press 100 also includes a limiting block 160, one end of the limiting block 160 is inserted into the first limiting groove 124, and the other end of the limiting block 160 is inserted into the second limiting groove 115, so as to limit the relative rotation of the conversion cylinder 120 and the inner cylinder 110.

[0112] Specifically in this embodiment, a first limiting groove 124 is formed at the lower end of the conversion cylinder 120, and the first limiting groove 124 is formed from the lower end of the conversion cylinder 120 to the upper end of the conversion cylinder 120. The second limiting groove 115 is formed by a boss protruding outward along the radial direction D of the inner cylinder 110 in the middle of the inner cylinder 110, and the length of the limiting block 160 along the axial direction F of the inner cylinder 110 is less than the length of the first limiting groove 124 along the axial direction F of the inner cylinder 110 and the length of the second limiting groove 115 along the axial direction of the inner cylinder 110. The length F of the limit block 160 along the axial direction of the inner cylinder 110 is greater than the length F of the first limit groove 124 along the axial direction of the inner cylinder 110, and the length F of the limit block 160 along the axial direction of the inner cylinder 110 is greater than the length F of the second limit groove 115 along the axial direction of the inner cylinder 110. Through the abutment between the limit block 160 and the first limit groove 124, and through the abutment between the limit block 160 and the second limit groove 115, the conversion cylinder 120 can be prevented from rotating relative to the inner cylinder 110.

[0113] like Figure 1 As shown, in one specific embodiment,

[0114] The clamping portion 310 includes a plurality of clamping teeth 311 , and the plurality of clamping teeth 311 are arranged at intervals along an end surface of the expansion plate element 300 facing the outside of the hydraulic fishing tool.

[0115] The hydraulic fishing tool provided in this embodiment can increase the friction between the expansion plate element 300 and the fallen fish by providing a plurality of latch teeth 311, so as to facilitate the engagement of the fallen fish. Specifically in this embodiment, a groove is formed between two adjacent latch teeth 311, and the protrusion and groove of the latch teeth 311 can engage and bite the outer surface of the fallen fish.

[0116] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic fishing tool, characterized in that: include: A hydraulic device, comprising an inner cylinder, a conversion cylinder, and an outer cylinder which are sequentially sleeved inside and outside, a liquid inlet passage connected to an oil pipe being provided at the top of the outer cylinder, a piston being provided in the inner cavity of the inner cylinder, the piston dividing the inner cavity of the inner cylinder into an upper end cavity and a lower end cavity along the direction from the wellhead to the bottom of the well, the upper end cavity being connected to the liquid inlet passage, a first liquid cavity connected to the liquid inlet passage and a second liquid cavity connected to the lower end cavity being formed between the conversion cylinder and the outer cylinder; An expansion plate element is movably arranged in the hydraulic device along the radial direction of the inner cylinder, one end of the expansion plate element is formed with a clamping portion for clamping the falling fish, and the other end of the expansion plate element is movably connected to the piston; The conversion cylinder can move between a first position and a second position along the axial direction of the inner cylinder, wherein when the conversion cylinder is located at the first position, the pressure liquid located in the upper end chamber can push the piston to move toward the bottom of the well and the piston can push the expansion plate element to move radially outward along the inner cylinder, and when the conversion cylinder is located at the second position, the first liquid chamber and the second liquid chamber are connected, the pressure liquid located in the lower end chamber can push the piston to move back toward the wellhead and the piston can pull the expansion plate element to move radially inward along the inner cylinder.

2. The hydraulic fishing tool according to claim 1, characterized in that: A piston cone wall is formed on one side of the piston facing the expansion plate element, and an expansion plate cone wall is formed on one end of the expansion plate element facing the piston, and the piston cone wall is correspondingly fitted with the expansion plate cone wall and can be movably engaged; Among them, when the piston moves toward the bottom of the well, the piston cone wall moves along the expansion plate cone wall toward the bottom of the well to push the expansion plate element to move radially outward along the inner tube; when the piston moves toward the wellhead, the piston cone wall moves along the expansion plate cone wall toward the wellhead to pull the expansion plate element to move radially inward along the inner tube.

3. The hydraulic fishing tool according to claim 2, characterized in that: The hydraulic press also includes a mosaic structure, which has a groove part and a protrusion part that can be embedded in each other and move relatively, wherein the groove part is formed on the piston cone wall, and the protrusion part is formed on the expansion plate cone wall, or the groove part is formed on the expansion plate cone wall, and the protrusion part is formed on the piston cone wall.

4. The hydraulic fishing tool according to claim 2 or 3, characterized in that: An infusion channel is provided at the top of the inner tube, and the infusion channel is connected to the liquid inlet channel and the upper end cavity respectively. A one-way liquid blocking component is provided on the top of the upper end cavity, and the one-way liquid blocking component can move toward or away from the infusion channel to block the infusion channel or make the infusion channel communicate with the upper end cavity.

5. The hydraulic fishing tool according to claim 4, characterized in that: The one-way liquid blocking component includes a plugging head and a first elastic member, the inner cavity of the plugging head is connected to the upper end cavity, a plurality of plugging holes are opened on the side wall of the plugging head, the plugging holes are respectively connected to the infusion channel and the upper end cavity, and the first elastic member is connected between the inner wall of the inner tube and the plugging head; Wherein, when the pressure of the upper end cavity is greater than the pressure of the liquid inlet channel, the pressure liquid located in the liquid inlet channel can enter the upper end cavity through the infusion channel and the plug hole in sequence, and when the pressure of the upper end cavity is equal to the pressure of the liquid inlet channel, the first elastic member can push the plugging head to block the infusion channel.

6. The hydraulic fishing tool according to claim 1, characterized in that: A first pressure relief hole is provided on the side wall of the inner cylinder, a second pressure relief hole is provided on the side wall of the conversion cylinder, and a third pressure relief hole is provided on the side wall of the outer cylinder. When the conversion cylinder is located at the second position, the first pressure relief hole, the second pressure relief hole, and the third pressure relief hole are connected in sequence so that the pressure liquid in the upper end cavity can flow out from the first pressure relief hole, the second pressure relief hole, and the third pressure relief hole.

7. The hydraulic fishing tool according to claim 4, characterized in that: A liquid passage is provided at the upper end of the conversion cylinder, and the liquid passage is connected to the liquid inlet channel and the liquid infusion channel respectively. A ball seat is provided in the liquid passage, and a blocking ball dropped from the oil pipe can block the ball seat. When the liquid passage is blocked, the pressure liquid in the liquid inlet channel can push the conversion cylinder to move from the first position to the second position.

8. The hydraulic fishing tool according to claim 1, characterized in that: The hydraulic press further comprises a second elastic member, which is connected between the bottom of the conversion cylinder and the inner cylinder and is used for pushing the conversion cylinder to return to the first position.

9. The hydraulic fishing tool according to claim 1, characterized in that: The bottom of the conversion cylinder is concavely formed with a first limiting groove, and the inner cylinder is convexly formed with a second limiting groove along its own radial outward direction. The hydraulic press also includes a limiting block, one end of the limiting block is inserted into the first limiting groove, and the other end of the limiting block is inserted into the second limiting groove, so as to limit the relative rotation of the conversion cylinder and the inner cylinder.

10. The hydraulic fishing tool according to claim 1, characterized in that: The clamping portion includes a plurality of clamping teeth, and the plurality of clamping teeth are arranged at intervals along an end surface of the expansion plate element facing the outside of the hydraulic salvage tool.

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