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Strong magnetic salvaging device and arrangement method for strong magnetic blocks of strong magnetic salvaging device

A layout method and overshot technology, which is applied in the direction of earthwork drilling, wellbore/well parts, etc., can solve the problems of lack of strong magnetic blocks, etc., and achieve the best fishing effect, increase the magnetism, and the best fishing strength

Inactive Publication Date: 2017-12-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current technology, there is a lack of a method for arranging the strong magnetic blocks to achieve a reasonable arrangement of the strong magnetic blocks, so that the strong magnetic fishing device has better fishing strength and effect

Method used

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  • Strong magnetic salvaging device and arrangement method for strong magnetic blocks of strong magnetic salvaging device
  • Strong magnetic salvaging device and arrangement method for strong magnetic blocks of strong magnetic salvaging device
  • Strong magnetic salvaging device and arrangement method for strong magnetic blocks of strong magnetic salvaging device

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Embodiment Construction

[0034] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art Modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application.

[0036] It should be noted that when an element is referred to as being “d...

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Abstract

The invention discloses a strong magnetic salvaging device and an arrangement method for strong magnetic blocks of the strong magnetic salvaging device. The strong magnetic salvaging device comprises a hollow barrel body, and the barrel body is provided with a central shaft; an upper end and a lower end which are opposite are arranged along the central shaft; an upper connector used for connecting a salvaging tube pillar is arranged at the upper end of the barrel body; a plurality of grooves are formed in the inner wall of the barrel body; at least two strong magnetic blocks are arranged in the grooves, and strong magnetic block groups are formed; the strong magnetic blocks are provided with opposite first magnetic poles and second magnetic poles of which the magnetism is contrary; the first magnetic poles of the strong magnetic blocks in the strong magnetic block groups point to the central shaft; and the second magnetic poles of the strong magnetic blocks are back to the central shaft. According to the strong magnetic salvaging device and the arrangement method for the strong magnetic blocks of the strong magnetic salvaging device, salvaging strength and salvaging effect of the strong magnetic salvaging device are improved.

Description

technical field [0001] The invention relates to the technical field of oil field downhole tools, in particular to a strong magnetic overshot and a method for arranging strong magnetic blocks thereof. Background technique [0002] The strong magnetic fisher is a tool that uses magnetism to fish small ferromagnetic metal falling objects in the well. [0003] There is only a ring-shaped strong magnetic strip in the middle of the bottom of the conventional strong magnetic fisher, and the salvage area is relatively small, and it can only salvage the fallen objects on the bottom surface of the strong magnetic field, but cannot salvage the fallen objects near the casing wall around the strong magnetic field. [0004] In recent years, many new strong magnetic overshots have emerged, which are mainly divided into side-opening and canister types. The fishing area and fishing efficiency are superior to conventional strong magnetic overshots. In the novel strong magnetic fisher, genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/06E21B31/18
CPCE21B31/06E21B31/18
Inventor 庞全书贾财华孙强王慧任伟杨依峰孙立超金志学陶维维窦玉梅王铁钊
Owner PETROCHINA CO LTD
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