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Disposable fishing device and fishing method thereof

A salvage device and hands-off technology, applied in the field of oil exploration, can solve problems such as low efficiency and complex structure, and achieve the effect of overcoming complex structure and convenient salvage operation

Active Publication Date: 2019-12-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by this application is to provide a throw-away fishing device and its fishing method, which can effectively overcome the defects of complex structure, low efficiency and jamming in fishing tools in the prior art

Method used

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  • Disposable fishing device and fishing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 As shown, Embodiment 1 of the present invention provides a disposable fishing device, which includes an upper joint 1 and a fishing body 2, the end of the upper joint 1 is connected to the end of the fishing main body 2; Ear seat 4 and spring 3, lug 5 is arranged in the preset hole of lug seat 4, spring 3 is arranged between the end surface of lug seat 4 and the end surface of upper joint 1; Store the first lug groove 15 of the lug 5, the first lug groove 15 is located between the lug 5 and the spring 3; the side of the lug seat 4 away from the spring 3 is provided with a first limit mechanism, the first limit mechanism The mechanism is used to limit the detachment of the lug seat 4 from the fishing main body 2 along the direction away from the upper joint 1 .

[0042] In the specific operation, the setting of the above-mentioned upper joint 1 can realize the convenient connection operation between the fishing tool and the drill pipe, and connect the uppe...

Embodiment 2

[0057] Embodiment 2 of the present invention provides a salvage method applied to the disposable salvage device described in Embodiment 1, which includes the following steps:

[0058] Step a: Lower the fishing device into the downhole pipe string through the drill pipe, and slide the lug into the first lug groove when stuck during lowering;

[0059] Step b: When the downhole pipe string is lowered to the preset position, the spring drives the lug to slide out of the first lug groove, and the lug is clamped to the inner wall of the downhole pipe string to carry out the lifting and fishing operation; when the lifting encounters resistance, execute step c;

[0060] Step c: Throw the throwing ball to the inside of the salvage body, the shearing ball seat moves down under pressure, and the shearing screw is cut to drive the shearing ring to move down together, the lug slides into the second lug groove, and the upper extraction is performed Salvage gear.

[0061] In the specific o...

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PUM

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Abstract

The invention discloses a release equipment fishing device and a fishing method applied to the release equipment fishing device. The release equipment device comprises an upper joint and a fishing main body. The end of the upper joint is connected with the end of the fishing main body, and the outer side of the fishing main body is sleeved with a convex lug seat and a spring; a convex lug is arranged in a pre-formed hole of the convex lug seat; the spring is arranged between the end face of the convex lug seat and the end face of the upper joint; a first convex lug groove used for temporarilystoring the convex lug is formed in the outer side of the fishing main body in the axial direction and located between the convex lug and the spring; and a first limiting mechanism is arranged on theside, away from the spring, of the convex lug seat and used for limiting the convex lug seat to be disengaged from the fishing main body in the direction away from the upper joint. The fishing methodcomprises the steps that the fishing device is put downwards into a downhole pipe column through a drilling rod, and when the fishing device is jammed in the downwards-putting process, the convex lugslides into the first convex lug groove.

Description

technical field [0001] The application relates to but not limited to the technical field of oil exploration, especially a disposable fishing device and a fishing method thereof. Background technique [0002] At present, it is often encountered in oil production that objects fall into the well, and the commonly used fishing tool is to connect the overshot at the lower end of the downhole string. [0003] However, the overshot in the prior art has the following disadvantages: 1. The structure of the overshot is complex, and its inner wall is provided with claws or slips, and the technical requirements for the joint are high; 2. The efficiency of the overshot is low. Limited, and the success rate of fishing is low, which can not effectively meet the actual use needs; 3. It is easy to get stuck. The current fishing tools only consider the ideal situation of falling objects or the smooth recovery of downhole strings, and do not consider the unsmooth recovery. Situation, such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/12E21B31/20
CPCE21B31/12E21B31/20
Inventor 蔡普利刘刚芝饶志华董社霞路振兴李强徐凤祥李同同
Owner CHINA NAT OFFSHORE OIL CORP