CN210530788U

CN210530788U - Returnable overshot

Info

Publication number: CN210530788U
Application number: CN201921458703.3U
Authority: CN
Inventors: 方锐; 杨志; 康露
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-05-15
Anticipated expiration: 2029-09-03

Abstract

The utility model discloses a retractable overshot, which comprises an upper joint, an upper barrel, a lower barrel and guide shoes which are connected in sequence from top to bottom, wherein a salvaging assembly is arranged in an inner cavity formed by the upper barrel and the lower barrel; the salvaging assembly comprises a spring, an upper limiting seat and a lower limiting seat which are respectively connected with the upper end and the lower end of the spring, and the bottom end of the lower limiting seat is connected with a slip; the upper end of the upper limiting seat is positioned in the upper joint and is fixedly connected with the upper joint through a breakable pin; the lower limiting seat bottom inner side wall is set to be a conical surface gradually expanding from top to bottom, three first sliding grooves which are uniformly distributed are formed in the conical surface along the radius direction, the slips comprise three groups of slip sheets, the upper ends of the three groups of slip sheets are arranged in the three first sliding grooves in a sliding mode respectively, the outer side face of the lower limiting seat is provided with a sliding key which can move up and down along the inner wall face of the upper barrel, and the bottom end of the lower barrel is in threaded connection with the guide shoe. The utility model discloses a cylindrical fish that falls of unidimensional not can be salvaged to an overshot, and can release the fish and withdraw from an overshot safely when salvaging and meeting the card.

Description

Returnable overshot

Technical Field

The utility model relates to a construction field is salvaged in the well workover, specifically is a can move back formula salvage section of thick bamboo.

Background

Oil field production often can need to salvage the operation, is the situation that is difficult to avoid under the prior art, and the fish that falls in the pit shaft is mostly the tubulose junk moreover. The existing fishing tool has various complicated operations, cannot meet the requirements of simplifying well repairing operation and shortening the operation period, and has complicated shaft conditions which are often accompanied with the condition that fish falls and is stuck. If fishing is carried out, the fishing and fish falling can not be smoothly carried out when the fishing is blocked, secondary accidents of a shaft can be caused, the difficulty of fishing and repairing the well is increased, the well repairing operation is complicated, and unnecessary economic loss is caused.

The main fishing mode of the existing fishing barrel for pipe rods provides clamping force for slips through springs, and the slips are clamped and enter the inner part of the barrel body. The prior fishing barrel has a small application range, and the fishing barrels with different diameters need to be replaced when fishing the falling fishes with different pipe diameters, so the operation period is long; when the fishing is blocked, the fishing tool does not have the blockage releasing capability, and secondary accidents are easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can salvage not unidimensional cylindrical fish, and salvage the formula of can moving back overshot that can release the fish safety and withdraw from when meeting the card.

The utility model provides a can move back formula overshot, its structure is including the top connection, last barrel, lower barrel, the guide shoe that from top to bottom connect gradually, goes up the inner chamber that barrel and lower barrel formed and sets up in and salvages the subassembly. And the outer side of the lower part of the upper joint is provided with threads which are connected with the upper cylinder body. The upper part of the lower cylinder is provided with external threads for being connected with the upper cylinder, and the lower part of the lower cylinder is in threaded connection with the guide shoe.

The salvaging component comprises a spring, an upper limiting seat and a lower limiting seat which are respectively connected with the upper end and the lower end of the spring, and the bottom end of the lower limiting seat is connected with a slip. The upper end of the upper limiting seat is positioned in the upper joint, the wall surface of the lower part of the upper joint is provided with a transverse pin hole, and the upper limiting seat is fixedly connected with the upper joint through a breakable pin. The lower limiting seat is cylindrical, the inner side wall of the bottom of the lower limiting seat is a conical surface gradually expanding from top to bottom, three first sliding grooves which are uniformly distributed are formed in the conical surface along the radius direction, the slips comprise three groups of slip pieces, and the upper ends of the three groups of slip pieces are arranged in the three first sliding grooves in a sliding mode respectively. The inner side of the slip is provided with teeth for increasing friction. The outer side surface of the lower limiting seat is provided with a second sliding key which can move up and down along the inner wall surface of the upper cylinder body. The upper end of the slip sheet is provided with a T-shaped sliding key which slides in the first sliding groove, and the outer side of the bottom end of the slip sheet is a tapered conical surface which is gradually narrowed and is used for being matched with the tapered conical surface on the inner side of the upper part of the lower barrel body and can slide on the tapered conical surface.

The inner side of the upper part of the lower barrel is provided with an oblique conical surface which is reduced from top to bottom, the bottom end of the slip sheet slides on the oblique conical surface in a contact manner, the inner side of the lower part of the lower barrel is provided with an oblique conical surface which is gradually expanded from top to bottom, and the bottom end of the lower barrel is in threaded connection with the guide shoe.

Preferably, the upper limiting seat is a hollow cylinder with an upper outer diameter smaller than a lower outer diameter, the inner diameter of the upper cylinder is smaller than the inner diameter of the spring, and the inner diameter of the lower cylinder is larger than the outer diameter of the spring; the top end of the upper cylinder is positioned in the upper joint and is connected with the upper joint through a breakable pin, the upper part of the spring is positioned in the lower cylinder, and the top end of the spring is abutted against the joint surface of the upper cylinder and the lower cylinder.

Preferably, the lower limiting seat is a hollow cylinder with a smaller upper outer diameter and a larger lower outer diameter, the lower part of the spring is sleeved on the upper cylinder, and the bottom end of the spring abuts against the engaging surface of the upper cylinder and the lower cylinder. The lower cylinder has an inner diameter smaller than that of the upper cylinder so that the wall thickness of the lower cylinder is larger than that of the upper cylinder. The inner side wall surface of the bottom of the lower cylinder is a conical surface gradually expanding from top to bottom. The outer side surface of the lower cylinder is provided with a second sliding key which can move up and down along the inner wall surface of the upper cylinder.

Preferably, the inner side of the lower part of the upper barrel is provided with threads which are connected with the threads of the lower barrel, the upper part of the upper barrel is provided with internal threads which are connected with the threads of the upper joint, and the inner wall surface of the upper barrel is provided with a second sliding groove which is used for being matched with a second sliding key.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a fishing barrel through the setting of the oblique conical surface of spacing seat and first spout under the spring, has realized that the slips piece can have the displacement on the horizontal direction, can snatch the cylindrical fish that falls of different diameters promptly, and simple structure is convenient for manufacturing. When the fishing rod is blocked, the limiting pin of the upper limiting seat of the spring can be broken to release fish, and the fishing rod safely exits from the fishing barrel, so that the economic benefit is reduced and improved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic view of the internal structure of the retractable overshot provided by the present invention.

Reference numbers in the figures:

the upper joint 1, the upper barrel 2, the lower barrel 3, the guide shoe 4, the spring 5, the upper limiting seat 6, the lower limiting seat 7, the slip sheet 8, the pin 9, the first sliding groove 10, the tooth 11, the T-shaped sliding key 12, the second sliding key 13, the second sliding groove 14 and the inclined conical surface 15.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

As shown in fig. 1, the utility model provides a can move back formula overshot, its structure is including top connection 1, upper barrel 2, lower barrel 3, the guide shoe 4 that from top to bottom connects gradually. The outer side of the lower part of the upper joint 1 is provided with threads to be connected with the upper cylinder 2. The upper part of the lower barrel body 3 is provided with external threads for being connected with the upper barrel body 2, and the lower part of the lower barrel body 3 is in threaded connection with the guide shoe 4. The inner side of the lower part of the upper barrel body 2 is provided with threads which are connected with the threads of the lower barrel body 3, and the upper part of the upper barrel body 2 is provided with internal threads which are connected with the threads of the upper joint 1. And a salvaging assembly is arranged in an inner cavity formed by the upper barrel body 2 and the lower barrel body 3. The fishing assembly comprises a spring 5, and an upper limiting seat 6 and a lower limiting seat 7 which are respectively connected with the upper end and the lower end of the spring 5 and used for limiting the spring 5. The bottom end of the lower limiting seat 7 is connected with a slip which consists of three groups of slip sheets 8.

The upper limiting seat 6 is a hollow cylinder with the upper outer diameter smaller than the lower outer diameter, the inner diameter of the upper cylinder is smaller than the inner diameter of the spring 5, and the inner diameter of the lower cylinder is larger than the outer diameter of the spring 5. The top of the upper cylinder is located in the upper joint 1. The wall surface of the top of the upper cylinder is provided with two bilateral symmetrical transverse pin holes, the wall surface of the lower part of the upper joint 1 is also provided with two bilateral symmetrical transverse pin holes, and the upper limiting seat 6 is fixedly connected with the upper joint 1 through a breakable pin 9. The pin 9 can be broken to exit safely when the card is stuck. The upper part of the spring 5 is located in the lower cylinder and the top end of the spring 5 abuts against the engaging surface of the upper cylinder and the lower cylinder.

The lower limiting seat 7 is a hollow cylinder with a smaller upper outer diameter and a larger lower outer diameter, the lower part of the spring 5 is sleeved on the upper cylinder, and the bottom end of the spring 5 abuts against the joint surface of the upper cylinder and the lower cylinder. The spring 5 is arranged between the two limiting seats to provide clamping force for the slips. The lower cylinder has an inner diameter smaller than that of the upper cylinder so that the wall thickness of the lower cylinder is larger than that of the upper cylinder. The inner side wall surface of the bottom of the lower cylinder is a conical surface gradually expanding from top to bottom. Three first sliding grooves 10 which are uniformly distributed are arranged on the conical surface along the radius direction, and the upper ends of the three groups of clamping tiles 8 are respectively arranged in the three first sliding grooves 10 in a sliding manner. The inner side (clamping surface) of the slip is provided with teeth 11 for increasing friction so as to strengthen the clamping force. In a preferable structure, a T-shaped sliding key 12 is arranged at the upper end of the slip-clamping piece 8, the T-shaped sliding key 12 slides in the first sliding groove 10, and the outer side of the bottom end of the slip piece 8 is a tapered surface which gradually narrows and is used for matching with the tapered surface at the inner side of the upper part of the lower barrel 3 and can slide on the tapered surface. The clamping piece 8 is displaced in the horizontal direction, so that the fish falling from different pipe diameters can be grabbed. The outer side surface of the lower cylinder is provided with a second sliding key 13, and the inner wall surface of the upper cylinder 2 is provided with a second sliding groove 14 for being matched with the second sliding key 13, so that the whole lower limiting seat 7 can move up and down along the inner wall surface of the upper cylinder 2.

The inboard inclined conical surface 15 that sets up to the from top to bottom reduction of 3 upper portions of lower barrel, the contact slip on the inclined conical surface of 8 bottoms of card tile piece, the inboard inclined conical surface that sets up to the gradual expansion from top to bottom of 3 lower parts of lower barrel is used for introducing the fish, and 3 bottoms of lower barrel and guide shoe 4 threaded connection for the fish can get into a fishing barrel smoothly.

The working principle of the retractable overshot is as follows:

the upper joint 1 is connected with a pipe column and then is put into a well, a fish enters the barrel through the guide shoe 4, the fish pushes up the slip to open the tile clamping piece 8, and the fish enters the slip clamping surface. And lifting the pipe column, wherein the slips are in contact with the inclined conical surface of the lower barrel 3 to generate the combined action of the reaction force and the reaction force of the spring 5 so as to clamp the fallen fish tightly, thereby realizing the fishing of the fallen fish. When the fishing is blocked, the fishing tool cannot be pulled to be pulled firmly, the pipe column is required to be lowered to enable the falling fish to ascend to the lower limiting seat 7 of the spring until the limiting pin 9 is broken, the spring 5 is loosened at the moment, the slips cannot clamp the falling fish, and the pipe column is lifted to withdraw the fishing tool.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the applications listed in the specification and the examples. It can be applicable to various and be fit for the utility model discloses a field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A retractable overshot is characterized by comprising an upper joint, an upper barrel, a lower barrel and a guide shoe which are sequentially connected from top to bottom, wherein a salvaging assembly is arranged in an inner cavity formed by the upper barrel and the lower barrel; the fishing assembly comprises a spring, an upper limiting seat and a lower limiting seat which are respectively connected with the upper end and the lower end of the spring, and the bottom end of the lower limiting seat is connected with a slip; the upper end of the upper limiting seat is positioned in the upper joint and is fixedly connected with the upper joint through a breakable pin; the lower limiting seat is cylindrical, the inner side wall of the bottom of the lower limiting seat is provided with a conical surface which is gradually enlarged from top to bottom, three first sliding grooves which are uniformly distributed are formed in the conical surface along the radius direction, the slips comprise three groups of slip sheets, the upper ends of the three groups of slip sheets are respectively arranged in the three first sliding grooves in a sliding mode, and the outer side face of the lower limiting seat is provided with a second sliding key which can move up and down along the inner wall face of the upper cylinder;

2. The retractable overshot of claim 1, c h a r a c t e r i z e d in that the upper retaining base is a hollow cylinder with an upper outer diameter smaller than a lower outer diameter, an upper cylinder inner diameter smaller than a spring inner diameter, and a lower cylinder inner diameter larger than the spring outer diameter; the top end of the upper cylinder is positioned in the upper joint and is connected with the upper joint through a breakable pin, the upper part of the spring is positioned in the lower cylinder, and the top end of the spring is abutted against the joint surface of the upper cylinder and the lower cylinder.

3. The retractable overshot of claim 2, characterized in that the lower limiting seat is a hollow cylinder with a smaller upper outer diameter and a larger lower outer diameter, the lower part of the spring is sleeved on the upper cylinder, the bottom end of the spring is abutted against the joining surface of the upper cylinder and the lower cylinder, the inner side wall surface of the bottom of the lower cylinder is a conical surface which is gradually expanded from top to bottom; the outer side surface of the lower cylinder is provided with a second sliding key which can move up and down along the inner wall surface of the upper cylinder.

4. The retractable overshot of claim 3, characterized in that the lower seat has a lower cylinder inner diameter smaller than an upper cylinder inner diameter.

5. The retractable overshot of claim 3, characterized in that the lower inner side of the upper cylinder is provided with screw threads to be connected with the lower cylinder, the upper part of the upper cylinder is provided with internal screw threads to be connected with the upper connector screw threads, and the inner wall surface of the upper cylinder is provided with a second sliding groove for being matched with a second sliding key on the outer side surface of the lower limiting seat.

6. The retractable overshot of claim 1, characterized in that the upper end of the slip piece is provided with a T-shaped sliding key which slides in the first sliding groove, the outer side of the bottom end of the slip piece is a tapered surface which is used for matching with and sliding on the tapered surface of the inner side of the upper part of the lower cylinder body, and the inner side of the slip is provided with teeth which increase friction.

7. The retractable overshot of claim 1, c h a r a c t e r i z e d in that the lower body is provided with external threads on its upper part for connection to the upper body and a lower part for threaded connection to the guide shoe.

8. The retractable overshot of claim 1, characterized in that the upper connector has a transverse pin hole on the lower wall and is fixed with the upper limiting seat by a breakable pin, and the upper connector has a thread on the outer side of the lower part to connect with the upper cylinder.