Ball-throwing hydraulic type one-grip-grip tool

Abstract

The utility model discloses a ball throwing hydraulic type gripping tool which comprises an upper connector, a connecting cylinder and a gripping assembly. A piston set is arranged in the end, connected with the connecting cylinder, of the upper connector. The upper connector is connected with an external hydraulic system. The piston component comprises a first piston and a second piston, the second piston is located in the first piston, and the first piston and the second piston are coaxially arranged; steel balls are thrown into the upper joint and are divided into a first steel ball and a second steel ball; the second steel ball is embedded in the first piston and abuts against the end of the second piston so as to push the second piston to move in the axial direction of the tool. The first steel ball abuts against the end of the first piston so as to push the first piston to move in the axial direction of the tool and drive the grabbing assembly at the lower end to move in the axial direction of the tool and stretch out, and the stretching-out end of the grabbing assembly is a grabbing end. According to the tool, a coring tool, a reverse circulation fishing tool and a grabbing assembly are combined into a whole, so that the fishing efficiency of the falling objects at the bottom of the well is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling, in particular to a ball-throwing hydraulic one-piece grab tool. Background Art

[0002] During drilling construction, there are often fallen blocks in the wellbore that are not easy to break and cannot be carried out by circulation, and non-magnetic metal debris that falls at the wellhead. This part of the metal debris is difficult to break and salvage, which restricts production construction and even causes downhole accidents. At present, there is no tool that can completely salvage the downhole debris.

[0003] Therefore, based on the above technical problems, those skilled in the art urgently need to develop a ball-throwing hydraulic one-piece grab tool. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a ball-throwing hydraulic one-piece grab tool. Through the method of reverse circulation milling, the fallen blocks or debris at the bottom of the well are loaded into the tool. After throwing the ball, under the action of the liquid flow pressure, the liquid flow pushes the piston to compress the spring and drives the fishing claws to move downward. Finally, the fishing claws complete the capture of the fish under the contraction action of the radial deformation.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A ball-throwing hydraulic one-piece grab tool of the utility model, the tool includes:

[0007] An upper sub;

[0008] A connecting cylinder connected to the lower end of the upper sub; and

[0009] A one-piece grab assembly arranged at the lower end of the connecting cylinder;

[0010] A piston group is arranged inside the end of the upper sub connected to the connecting cylinder, and the upper sub is connected to an external hydraulic system;

[0011] The piston group is divided into a first piston and a second piston. Among them, the second piston is located inside the first piston, and the first piston and the second piston are coaxially arranged;

[0012] Steel balls are thrown inside the upper sub, and the steel balls are divided into a first steel ball and a second steel ball;

[0013] The second steel ball is embedded in the first piston and abuts against the end of the second piston to push the second piston to move along the axial direction of the tool;

[0014] The first steel ball abuts against the end of the first piston to push the first piston to move axially along the tool, and drive a one-piece grab assembly at the lower end to move axially along the tool and extend out. The extending end of the one-piece grab assembly is the grabbing end.

[0015] Furthermore, multiple O-rings are installed at the connection between the upper sub and the connecting cylinder;

[0016] The upper sub has a side hole on its side, and the connecting cylinder has a side hole on its side that communicates with the side hole of the upper sub;

[0017] Shearing pins are arranged radially inside the upper sub and at the position where it cooperates with the piston group along the radial direction of the tool;

[0018] A positioning pin is arranged radially at the lower part of the first piston;

[0019] After the second piston moves axially along the tool, its moving stroke is restricted by the positioning pin.

[0020] Furthermore, the lower end of the first piston is connected with a drive cylinder, and a spring is arranged between the drive cylinder and the lower part of the connecting cylinder;

[0021] When the first piston drives the drive cylinder to move downward axially along the tool, the drive cylinder compresses the spring.

[0022] Furthermore, the one-piece grab assembly includes:

[0023] A fishing claw outer cylinder connected to the lower part of the connecting cylinder; and

[0024] A milling sleeve located inside the fishing claw outer cylinder and arranged coaxially with the fishing claw outer cylinder;

[0025] The milling sleeve can move axially along the tool along with the drive cylinder, and the end of the milling sleeve is a fishing claw composed of multiple claw parts.

[0026] Furthermore, a connecting backup cap is arranged on the inner wall of the end of the drive cylinder connected to the milling sleeve, and a magnet placed inside the milling sleeve is connected to the connecting backup cap.

[0027] In the above technical solution, a ball-throwing hydraulic one-piece grab tool provided by the present utility model has the following beneficial effects:

[0028] The tool of the present utility model loads the dropped blocks or fallen objects at the bottom of the well into the tool by means of reverse circulation milling. After throwing the ball, under the action of the liquid flow pressure, the liquid flow pushes the piston to compress the spring and drives the fishing claw to move downward. Finally, the captured fish is completed under the contraction action of the radial deformation of the fishing claw. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Structural schematic diagram of the ball-throwing hydraulic one-piece grab tool disclosed in the embodiment of the present application;

[0031] Figure 2 Schematic diagram of the mating position of the first steel ball and the first piston and the mating position of the second steel ball and the second piston of the ball-throwing hydraulic one-piece grab tool disclosed in the embodiment of the present application;

[0032] Figure 3 Structural schematic diagram of the second steel ball driving the second piston to move in place of the ball-throwing hydraulic one-piece grab tool disclosed in the embodiment of the present application;

[0033] Figure 4 Structural schematic diagram of the first steel ball driving the first piston and the fishing claw at the front end to move in place of the ball-throwing hydraulic one-piece grab tool disclosed in the embodiment of the present application.

[0034] Figure 5 Internal flow channel schematic diagram of the ball-throwing hydraulic one-piece grab tool disclosed in the embodiment of the present application;

[0035] Figure 6 Schematic diagram of the flow channel of the external circulation of the flow channel when the fishing claw of the ball-throwing hydraulic one-piece grab tool disclosed in the embodiment of the present application extends;

[0036] Explanation of reference numerals:

[0037] 1. Upper sub; 2. Connecting cylinder; 4. O-ring; 5. Shearing pin; 6. Positioning pin; 7. Spring; 9. One-piece grab assembly; 11. First steel ball; 12. Second steel ball;

[0038] 301. First piston; 302. Second piston;

[0039] 801. Connecting backup cap; 802. Magnet; 803. Countersunk head screw;

[0040] 901. Fishing claw outer cylinder; 902. Milling sleeve; 903. Fishing claw; 904. Directional screw. Detailed implementation manners

[0041] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the following will further introduce the present utility model in detail in conjunction with the drawings.

[0042] SeeFigures 1 to 4 as shown;

[0043] This embodiment discloses a hydraulic one - grab tool for pitching balls. The tool includes:

[0044] upper sub 1;

[0045] a connecting cylinder 2 connected to the lower end of the upper sub 1; and

[0046] a one - grab assembly 9 provided at the lower end of the connecting cylinder 2;

[0047] A piston group is provided inside the connection end of the upper sub 1 and the connecting cylinder 2. The upper sub 1 is connected to an external hydraulic system;

[0048] The piston group is divided into a first piston 301 and a second piston 302. Among them, the second piston 302 is located inside the first piston 301, and the first piston 301 and the second piston 302 are coaxially arranged;

[0049] Steel balls are thrown into the upper sub 1, and the steel balls are divided into a first steel ball 11 and a second steel ball 12;

[0050] The second steel ball 12 is embedded in the first piston 301 and abuts against the end of the second piston 302 to push the second piston 302 to move axially along the tool;

[0051] The first steel ball 11 abuts against the end of the first piston 301 to push the first piston 301 to move axially along the tool, and drives the one - grab assembly 9 at the lower end to move axially along the tool and extend. The extending end of the one - grab assembly 9 is the grabbing end.

[0052] Specifically, this embodiment discloses a tool that integrates a coring tool, a reverse - circulation fishing tool, and a one - grab assembly 9. It mainly loads the dropped blocks or fallen objects at the bottom of the well into the tool by means of reverse - circulation milling. After pitching the balls, the fishing claws 903 of the one - grab assembly 9 are tightened by hydraulic pressure to complete the thorough fishing of the fallen objects at the bottom of the well. The tool of this embodiment mainly includes an external sub 1, a connecting cylinder 2, and a one - grab assembly 9 at the lower end.

[0053] Among them, the external sub 1 is connected to an external hydraulic system, and a piston group is provided inside. It is divided into a first piston 301 and a second piston 302. Among them, the second piston 302 of this embodiment is located inside the first piston 301. The main way to drive the first piston 301 and the second piston 302 is by using steel balls, that is, the first piston 301 is driven to move axially by the first steel ball 11, and the second piston 302 is driven to move axially by the second steel ball 12.

[0054] Preferably, multiple O-rings 4 are installed at the connection between the upper sub 1 and the connection cylinder 2 in this embodiment; among them, the side of the upper sub 1 in this embodiment has a side hole of the upper sub, and the side of the connection cylinder 2 has a side hole of the connection cylinder communicating with the side hole of the upper sub; a shear pin 5 is arranged radially along the tool inside the upper sub 1 and at a position cooperating with the piston assembly; in addition, a positioning pin 6 is arranged radially at the lower part of the first piston 301 in this embodiment; after the second piston 302 moves axially along the tool, the movement stroke is restricted by the positioning pin 6.

[0055] First, slowly lower the drill string. When it is about 0.5 m away from the fish, drop the second steel ball 12, start the rotary table and slowly lower the drill string. When the pump pressure of the hydraulic system increases to 3 MPa, intermittently shear the shear pin 5. At this time, the second steel ball 12 contacts the second piston 302 and pushes the second piston 302 downward until it is blocked by the positioning pin 6. At this time, the fish also enters the milling barrel 902 of the one-piece grab assembly 9, and starts to mill the fish. Refer to Figure 5 As shown, and at this time the liquid flow flows from the side of the first piston 301 through the side hole until the outside of the tool and then flows to the bottom of the tool, and flows into the inner cavity of the tool from the gap between the milling barrel 902 and the fish. Secondly, a drive cylinder is connected to the lower end of the first piston 301 in this embodiment, and a spring 7 is arranged between the drive cylinder and the lower part of the connection cylinder 2; when the first piston 301 drives the drive cylinder to move downward along the axis of the tool, the drive cylinder compresses the spring 7. In addition, a connection backup cap 801 is arranged on the inner wall of the end of the drive cylinder connected to the milling barrel 902 in this embodiment, and a magnet 802 placed inside the milling barrel 902 is connected to the connection backup cap 801. The liquid flow entering the inner cavity of the tool flows from the connection backup cap 801 to the inner cavity of the piston, and then flows from the side of the inner cavity of the first piston 301 to the outside of the tool and returns to the wellhead. At this time, part of the iron filings will be adsorbed by the magnet 802 installed on the connection backup cap 801 to prevent them from wandering in the well due to insufficient upward liquid flow.

[0056] Preferably, the one-piece grab assembly 9 in this embodiment includes a fishing claw outer cylinder 901 connected to the lower part of the connection cylinder 2; and a milling barrel 902 located inside the fishing claw outer cylinder 901 and coaxially arranged with the fishing claw outer cylinder 901; the milling barrel 902 can move axially along the tool along with the drive cylinder, and the end of the milling barrel 902 is a fishing claw 903 composed of multiple claw parts.

[0057] This embodiment further defines the structure of the one-piece grab assembly 9, which is divided into a fishing claw outer cylinder 901, a milling barrel 902 and a fishing claw 903 at the front end; the fishing claw outer cylinder 901 in this embodiment is connected to the connection cylinder 2, while the inner milling barrel 902 is connected to the drive cylinder and can move axially along the tool along with the drive cylinder. At the same time, the front fishing claw 903 can also move axially along the tool to the outside of the tool along with the milling barrel 902.

[0058] After the milling cylinder 902 reaches the position where it can be salvaged, stop the rotary table, stop the pump, and insert the first steel ball 11. Then start the pump. When the first steel ball 11 falls into the upper tapered hole of the first piston 301, the external circulation channel is blocked, forming a pressure buildup. When the pump pressure rises to 4 MPa, the liquid flow pressure shears the two shear pins 5. See Figure 6 As shown, at this time, the liquid flow pushes the first piston 301 downward to compress the spring 7 and drives the fishing claw 903 at the front end downward, and exposes another external circulation channel. At this time, the fishing claw 903 radially deforms and contracts inward under the action of the liquid flow pressure, completing the function of capturing the fish. Then stop the pump, lift the drill string, and lift the fish, completing the milling and fishing operation.

[0059] In the above technical solution, a ball-throwing hydraulic one-hand grab tool provided by the present utility model has the following beneficial effects:

[0060] The tool of the present utility model loads the dropped blocks or fallen objects at the bottom of the well into the tool by means of reverse circulation milling. After throwing the ball, under the action of the liquid flow pressure, the liquid flow pushes the piston to compress the spring 7 and drives the fishing claw 903 downward. Finally, the fish is captured under the contraction action of the radial deformation of the fishing claw 903.

[0061] The tool of the present utility model combines a coring tool, a reverse circulation fishing tool and a one-hand grab assembly 9 into one, so as to effectively improve the fishing efficiency of the fallen objects at the bottom of the well.

[0062] Only some exemplary embodiments of the present utility model have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present utility model, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present utility model.

Claims

1. A ball-throwing hydraulic grabbing tool, characterized in that: The tool includes: Upper connector (1); a connecting tube (2) connected to the lower end of the upper joint (1); and A grab assembly (9) disposed at the lower end of the connecting tube (2); A piston group is arranged inside one end of the upper joint (1) connected to the connecting tube (2), and the upper joint (1) is connected to an external hydraulic system; The piston component comprises a first piston (301) and a second piston (302), wherein the second piston (302) is located inside the first piston (301), and the first piston (301) and the second piston (302) are coaxially arranged; Steel balls are thrown into the upper joint (1), and the steel balls are divided into a first steel ball (11) and a second steel ball (12); The second steel ball (12) is embedded in the first piston (301) and abuts against the end of the second piston (302) to push the second piston (302) to move along the axial direction of the tool; The first steel ball (11) abuts against the end of the first piston (301) to push the first piston (301) to move along the axial direction of the tool, and drives a grasping assembly (9) at the lower end to move along the axial direction of the tool and extend, and the extended end of the grasping assembly (9) is a grasping end.

2. The ball pitching hydraulic grabbing tool according to claim 1, characterized in that: A plurality of O-rings (4) are installed at the connection between the upper joint (1) and the connecting tube (2); The side surface of the upper joint (1) has an upper joint side hole, and the side surface of the connecting tube (2) has a connecting tube side hole connected to the upper joint side hole; A shear pin (5) is provided inside the upper joint (1) and at a position cooperating with the piston assembly along the radial direction of the tool; A positioning pin (6) is radially arranged at the lower portion of the first piston (301); After the second piston (302) moves along the axial direction of the tool, the movement stroke is limited by the positioning pin (6).

3. The ball pitching hydraulic grabbing tool according to claim 2, characterized in that: The lower end of the first piston (301) is connected to a driving cylinder, and a spring (7) is provided between the driving cylinder and the lower part of the connecting cylinder (2); When the first piston (301) drives the driving cylinder to move downward along the axial direction of the tool, the driving cylinder compresses the spring (7).

4. The ball pitching hydraulic grabbing tool according to claim 3, characterized in that: The grab assembly (9) comprises: A fishing claw outer tube (901) connected to the lower part of the connecting tube (2); and A sleeve milling cylinder (902) located inside the fishing claw outer cylinder (901) and arranged coaxially with the fishing claw outer cylinder (901); The sleeve milling cylinder (902) can move along the axial direction of the tool along with the driving cylinder, and the end of the sleeve milling cylinder (902) is a fishing claw (903) composed of a plurality of claws.

5. The ball pitching hydraulic grabbing tool according to claim 4, characterized in that: A connection cap (801) is provided on the inner wall of one end of the driving cylinder connected to the sleeve milling cylinder (902), and the connection cap (801) is connected to a magnet (802) disposed inside the sleeve milling cylinder (902).

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