CN211201839U

CN211201839U - Hydraulic control type underground fishing device

Info

Publication number: CN211201839U
Application number: CN201921864294.7U
Authority: CN
Inventors: 王怡; 迟浩迪; 张开强
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-08-07
Anticipated expiration: 2029-11-01

Abstract

A hydraulic control type underground fishing device mainly comprises an upper joint, a pressing piston, a positioning pin, an upper mandrel, a rotary ratchet wheel, a middle mandrel, a shell, a steel ball, a slip, a lower mandrel, a screw, a sealing ring, a thrust bearing, a reset spring, a sliding sleeve, a pin spring and a semi-circular key, and is characterized in that the upper joint and the lower mandrel, the pressing piston and the upper mandrel, and the upper mandrel and the middle mandrel are all connected through threads; a return spring is arranged between the pressure piston and the step on the inner wall of the upper joint; a rotary ratchet and a thrust bearing are arranged between the upper mandrel and the middle mandrel; the outer wall of the pressing piston is provided with a groove, and a positioning pin and a pin spring are arranged between the pressing piston and the sliding sleeve; the lower end of the middle mandrel extends into the inner wall of the lower mandrel, and a sealing ring is arranged on the outer wall of the lower end of the middle mandrel; the shell and the slips are connected through steel balls.

Description

Hydraulic control type underground fishing device

Technical Field

The utility model relates to a fishing device, especially a hydraulic control type fishing device in pit belongs to oil and gas engineering or mechanical engineering technical field.

Background

When the well is drilled into the middle and later span, the well depth is continuously increased, the drill string is gradually lengthened, and therefore underground accidents are easily caused, such as drill string breakage or fish falling of a lower drilling tool into the bottom of the well, and the abandonment of the oil-gas well is caused in severe cases. When fish falls at the bottom of the well, the fish is generally caught by a fishing device and then lifted out of the well and taken down. At present, various types of fishing devices are adopted on site, but the fishing devices have different advantages and disadvantages. The utility model discloses on aiming at current fishing device's basis, provide a new fishing device structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: a hydraulic control type underground fishing device is provided.

In order to achieve the above purpose, the utility model discloses a technical scheme is: a hydraulic control type underground fishing device mainly comprises an upper joint, a pressing piston, a positioning pin, an upper mandrel, a rotary ratchet wheel, a middle mandrel, a shell, a steel ball, a slip, a lower mandrel, a screw, a sealing ring, a thrust bearing, a reset spring, a sliding sleeve, a pin spring and a semi-circular key, and is characterized in that the upper joint and the lower mandrel, the pressing piston and the upper mandrel, and the upper mandrel and the middle mandrel are all connected through threads; a return spring is arranged between the pressure piston and the step on the inner wall of the upper joint; a rotary ratchet and a thrust bearing are arranged between the upper mandrel and the middle mandrel; the outer wall of the pressing piston is provided with a groove, and a positioning pin and a pin spring are arranged between the pressing piston and the sliding sleeve; the lower end of the middle mandrel extends into the inner wall of the lower mandrel, and a sealing ring is arranged on the outer wall of the lower end of the middle mandrel; the shell is connected with the slips through steel balls; when the fishing device is in a lifting state, the slips and the lower mandrel are slowly put into the fish, the slips bite the fish under the action of the pretightening force of the slips, when the upper joint is lifted, the lower mandrel which is connected with the upper joint through threads also moves upwards together, the inclined plane at the lower end of the lower mandrel can enable the slips to bite the fish more and more tightly, the positioning pin is not inserted into the shell in the process, and the fishing device can be lifted out of the shaft by lifting; when the fish is blocked or can not be safely taken out due to too heavy weight, the fishing device for tightly biting the fish is taken out, namely, the releasing is realized, the tool returns to the initial position, at the moment, the slurry pump is started, the piston is pressed under the action of fluid pressure to push the upper mandrel and the middle mandrel to move downwards, the piston is pressed to insert the positioning pin into the pin hole of the shell, the shell and the upper joint are fixed together, the slips and the lower mandrel are in a separated state at the moment, and the slips can be compressed and the fishing device can be taken out by lifting the fishing device.

Compared with the prior art, the utility model discloses the beneficial effect who has is: (1) the device has simple structure and convenient operation; (2) the fishing device can still be taken out when the fish is stuck or too heavy.

Drawings

FIG. 1 is a schematic view of a hydraulic control type downhole fishing device according to the present invention when the fishing device is not lifted up to fish;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic structural view of a rotary ratchet in the hydraulic control type downhole fishing device of the present invention;

FIG. 4 is another schematic structural view of the rotary ratchet of the hydraulic control type downhole fishing device of the present invention;

FIG. 5 is a schematic view of the hydraulic control type fishing device in a well when fish is lifted up;

in the figure: 1. the device comprises an upper joint, 2 a pressing piston, 3 a positioning pin, 4 an upper mandrel, 5 a rotating ratchet wheel, 6 a middle mandrel, 7 a shell, 8 a steel ball, 9 a slip, 10 a lower mandrel, 11 a screw, 12 a sealing ring, 13 a thrust bearing, 14 a return spring, 15 a sliding sleeve, 16 a pin spring and 17 a semicircular key.

Detailed Description

As shown in fig. 1-5, a hydraulic control type downhole fishing device mainly comprises an upper joint 1, a pressure piston 2, a positioning pin 3, an upper mandrel 4, a rotary ratchet wheel 5, a middle mandrel 6, a shell 7, a steel ball 8, a slip 9, a lower mandrel 10, a screw 11, a sealing ring 12, a thrust bearing 13, a return spring 14, a sliding sleeve 15, a pin spring 16 and a semi-circular key 17, and is characterized in that the upper joint 1 and the lower mandrel 10, the pressure piston 2 and the upper mandrel 4, and the upper mandrel 4 and the middle mandrel 6 are all connected through threads; a return spring 14 is arranged between the pressure piston 2 and the step on the inner wall of the upper joint 1; a rotary ratchet wheel 5 and a thrust bearing 13 are arranged between the upper mandrel 4 and the middle mandrel 6; the outer wall of the pressing piston 2 is provided with a groove, and a positioning pin 3 and a pin spring 16 are arranged between the pressing piston 2 and the sliding sleeve 15; the lower end of the middle mandrel 6 extends into the inner wall of the lower mandrel 10, and a sealing ring 12 is arranged on the outer wall of the lower end of the middle mandrel 6; the shell 7 is connected with the slips 9 through steel balls 8; when the fishing device is in a lifting state, the slips 9 and the lower mandrel 10 are slowly put into the fallen fish, the slips 9 bite the fallen fish under the action of the pretightening force of the slips 9, when the upper joint 1 is lifted, the lower mandrel 10 connected with the upper joint 1 through threads also moves upwards together, the inclined surface at the lower end of the lower mandrel 10 enables the slips 9 to bite the fallen fish more and more tightly, the positioning pin 3 is not inserted into the shell 7 in the process, and the fallen fish can be lifted out of the shaft by lifting the fishing device; when the fish is blocked or can not be safely taken out due to too heavy weight, the fishing device for tightly biting the fish is taken out, namely, the releasing is realized, the tool returns to the initial position, at the moment, the slurry pump is started, the piston 2 is pressed under the action of fluid pressure to push the upper mandrel 4 and the middle mandrel 2 to move downwards, the piston 2 is pressed at the same time to insert the positioning pin 3 into the pin hole of the shell 7, the shell 7 and the upper joint 1 are fixed together, the slips 9 and the lower mandrel 10 are in a separated state at the moment, and the slips 9 can be compressed and taken out by lifting the fishing device.

Claims

1. A hydraulic control type underground fishing device mainly comprises an upper joint (1), a pressing piston (2), a positioning pin (3), an upper mandrel (4), a rotary ratchet (5), a middle mandrel (6), a shell (7), a steel ball (8), a slip (9), a lower mandrel (10), a screw (11), a sealing ring (12), a thrust bearing (13), a reset spring (14), a sliding sleeve (15), a pin spring (16) and a semi-circular key (17), and is characterized in that the upper joint (1), the lower mandrel (10), the pressing piston (2) and the upper mandrel (4), and the upper mandrel (4) and the middle mandrel (6) are all in threaded connection; a return spring (14) is arranged between the pressure piston (2) and the step of the inner wall of the upper joint (1); a rotary ratchet wheel (5) and a thrust bearing (13) are arranged between the upper mandrel (4) and the middle mandrel (6); a groove is formed in the outer wall of the pressing piston (2), and a positioning pin (3) and a pin spring (16) are arranged between the pressing piston (2) and the sliding sleeve (15); the lower end of the middle mandrel (6) extends into the inner wall of the lower mandrel (10), and a sealing ring (12) is arranged on the outer wall of the lower end of the middle mandrel (6); the shell (7) is connected with the slips (9) through the steel balls (8); when the fishing device is in a lifting state, the slips (9) and the lower mandrel (10) are slowly put into the fallen fish, the slips (9) bite the fallen fish under the action of the pretightening force of the slips (9), when the upper joint (1) is lifted, the lower mandrel (10) which is connected with the upper joint (1) through threads also moves upwards together, the slips (9) bite the fallen fish more and more tightly by the inclined surface at the lower end of the lower mandrel (10), the positioning pin (3) is not inserted into the shell (7) in the process, and the fallen fish can be lifted out of the shaft by lifting the fishing device; when the fish is blocked or cannot be safely taken out due to too heavy weight, the fishing device for tightly biting the fish is taken out, namely, the tool is returned to the initial position by releasing, at the moment, a slurry pump is started, the piston (2) is pressed under the action of fluid pressure to push the upper mandrel (4) and the middle mandrel (6) to move downwards, the piston (2) is pressed to insert the positioning pin (3) into the pin hole of the shell (7), the shell (7) and the upper joint (1) are fixed together, the slips (9) and the lower mandrel (10) are in a separated state at the moment, and the slips (9) can be compressed by lifting the fishing device and the fishing device can be taken out.