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Hydraulic assisted salvage tool

A salvage tool and hydraulic assist technology, applied in wellbore/well components, earthwork drilling and other directions, can solve problems such as difficulty in salvaging the inner cylinder, reduce salvage difficulty and salvage risk, and avoid excessive salvage force.

Active Publication Date: 2015-04-15
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to provide a hydraulically assisted fishing tool that solves the problem of difficulty in fishing the inner cylinder after the cementing is completed, and is suitable for the technology of cementing the top of the screen without drilling plugs

Method used

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  • Hydraulic assisted salvage tool

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Experimental program
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Effect test

Embodiment 1

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The hydraulic power-assisted fishing tool is mainly composed of a hydraulic cylinder 1, a central pipe 2 and a ball seat 3. The top of the central pipe 2 is sheathed with an upper joint 4 for sealing connection, which can be connected with the upper pipe by a screw. There is an annular stepped protrusion in the middle of the center pipe 2, and a hydraulic chamber 5 surrounding the center pipe is formed between the center pipe and the hydraulic cylinder. Sealing rings 6 are installed up and down the hydraulic chamber 5, or replaced by other sealing parts. There are through holes evenly distributed around the periphery as hydraulic holes 7 under the annular stepped protrusion of the central tube 2, so that the inner cavity of the central tube communicates with the hydraulic cavity 5 . Below the liquid cylinder 1 is a centralizing block 8, and several axial str...

Embodiment 2

[0019] With reference to the drawings and descriptions of Embodiment 1, this embodiment is an embodiment of a simplified solution.

[0020] The hydraulic power-assisted fishing tool is mainly composed of a hydraulic cylinder, a center pipe and a ball seat. Wherein: the liquid cylinder sleeve is outside the central pipe, the upper end of the liquid cylinder is provided with an upper joint, and the lower end of the liquid cylinder is connected with the central pipe through radially distributed shearing parts. The upper part of the central pipe and the upper joint of the liquid cylinder form an axial sliding seal fit, the lower part of the central pipe extends out of the bottom of the liquid cylinder, and the lower end is connected with the ball seat, and the outer wall of the central pipe is provided with an annular step. There is an annular step in the middle of the hydraulic cylinder near the lower part of the annular step of the central tube. The annular step of the central t...

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PUM

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Abstract

The invention relates to a hydraulic assisted salvage tool. The hydraulic assisted salvage tool mainly comprises a hydraulic cylinder, a center tube and a ball seat; the top of the center tube is sleeved with an upper connector which is connected in a sealing mode; the middle part of the center tube is provided with an annular step bulge, and the annular step bulge and the hydraulic cylinder form a hydraulic chamber for surrounding the center tube; sealing components are arranged on the upper part and the lower part of the hydraulic chamber; through holes are uniformly distributed in the periphery of the lower part of the annular step bulge of the center tube and are taken as hydraulic holes; the lower part of the hydraulic cylinder is provided with a correcting block; the center tube is fixed with the correcting block through a pressure cutting component; the bottom of the center tube is connected with the ball seat; and the lower part of the ball seat is processed with a screw thread. The upper periphery of the wiper block is uniformly provided with a plurality of axial strip-type elastic metal sheet correcting sheet, and the middle part of the correcting sheet is slightly convex. According to the tool, the center tube drives the lower tool to lift under the action of hydraulic pressure, so that a phenomenon that the instant salvaging force is too high when a non-drilling plug tool inner cylinder is salvaged is avoided, and salvage difficulty and salvage risks are reduced.

Description

technical field [0001] The invention relates to a hydraulic power-assisted fishing tool for cementing in the late stage of oil drilling and completion in the field of fishing tools for downhole operations. Background technique [0002] The screen top cementing without drilling plug technology has been widely recognized in the field of oil drilling and completion because it avoids the problem of wear and damage to the casing caused by drilling through the grading hoops and blind plates in the later stage of the traditional screen top cementing process. The Chinese utility model patent with the patent number ZL201120157427.4 describes in detail a kind of plug-free tool which is relatively mature in application at present. After the cementing operation on the top of the screen pipe is completed, the tool is lowered into the salvage spear to catch the matching buckle on the inner cylinder, and then the inner cylinder and the blind plate connected to it are extracted, thereby omi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/20
CPCE21B31/20
Inventor 彭志刚李国锋徐鑫许婵婵董恩博张磊邹晓敏赵勇马明新
Owner CHINA PETROCHEMICAL CORP