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Wellbottom fishing grab

A fishing device and insertion technology, which is applied in the direction of wellbore/well parts, earthwork drilling and mining, etc., can solve the problems of complex structure of the fishing device, low fishing success rate, high joint technical requirements, etc., so that it is suitable for popularization and application and successful fishing High efficiency and good locking effect

Inactive Publication Date: 2007-11-21
ZHEJIANG HUWANG IND
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  • Abstract
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AI Technical Summary

Problems solved by technology

Chinese Utility Model Patent Specification ZL88217830.x discloses that the multifunctional overshot is composed of joints connected to a fishing cup, a water diversion joint, an inner cylinder, an outer cylinder, guide shoes and claws, etc., and has the function of a strong magnetic overshot. The structure of the device is complex, the technical requirements for joints are high, and the success rate of salvage is low

Method used

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  • Wellbottom fishing grab
  • Wellbottom fishing grab
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Examples

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Embodiment Construction

[0016] Take the salvage well diameter of 200mm as an example, as shown in Figure 1 and Figure 2, the device includes a salvage inner cylinder 8, a salvage outer cylinder 2 and a salvage piece 6, the lower part of the salvage inner cylinder 8 is a trumpet-shaped mouth, and the lower part of the salvage inner cylinder 8 is The diameter of the bell-shaped mouth is 196mm, which is 4mm smaller than the diameter of the salvage well. As shown in FIGS. 6 and 7 , six inner cylinder notches 81 and outer cylinder notches 71 are evenly formed on the upper parts of the salvage inner cylinder 8 and the salvage outer cylinder 7 . As shown in Figure 5, there are three bayonets 61 on the side of the salvage sheet 6, and each pair of inner cylinder notches 81 and outer cylinder notches 71 corresponding to the upper parts of the salvage inner cylinder 8 and the salvage outer cylinder 7 are respectively placed. Insert a piece of salvage piece 6, according to salvage rods and pipes with different ...

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Abstract

The invention provides a bottom hole salvaging apparatus. It is mainly used at drilling site to salvage the falling pump, perch and pipe etc. The apparatus contains salvaging inner cylinder, salvaging outer cylinder and salvaging tablet. The inner and outer cylinders are concentric and the outer cylinder covers the upper part of the inner cylinder. The upper parts of them have several relative notches. There are latch notches on lateral of the salvaging tablet. Set salvaging tablets into each pair of notches. The latch notches of the salvaging tablets set on the wall of the inner cylinder and their heads are put into each pair of relative notches of the outer cylinder. The shift rings are set separately on the walls of both the inner and outer cylinders. The apparatus has characteristics of simple structure, convenient operation, fast speed and high salvaging success rate etc.

Description

technical field [0001] The invention relates to a well bottom fisher, which is mainly used for salvaging sundries such as pumps, rods, pipes and the like falling into the well bottom at water wells and well drilling sites. Background technique [0002] Due to various factors during the use of water wells, geological drilling and oil production, pumps, rods, pipes, etc. may sometimes fall into the well. It is very difficult to wait for a small-caliber wellhead. If the pumps, rods, pipes, etc. are not salvaged, the well passage will be seriously blocked, which may lead to the scrapping of the water well and the drilling. In the prior art, drilling rigs are often used to carry out mechanical fishing methods. The equipment is heavy, and the equipment salvaged is all scrapped, the cost is high, and it is only limited to the use of open-air wells. Chinese utility model patent specification ZL91203845.4 discloses a catch type overshot, and its structural principle is: a spring is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/18
Inventor 姜新民
Owner ZHEJIANG HUWANG IND
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