Variable bent joint

A bendable and variable technology, applied in wellbore/well components, earth-moving drilling, etc., can solve the problems of low reuse rate and high cost of salvage tools, and achieve high salvage success rate, wide application range and high strength. Effect

Inactive Publication Date: 2015-09-16
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of incomplete fishing tools, the accident treatment is mainly to process the fishing tools according to the specific conditions in the well, or even use the vertical well fishing technology, which has the disadvantages of low reuse rate and high cost of fishing tools

Method used

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Examples

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Embodiment Construction

[0017] The bendable joint includes an outer cylinder 1 , an orientation joint 2 , a piston 3 , an upper joint 4 and a lower joint 5 . One end of the outer cylinder 1 is threaded with an upper joint 4 ; a piston 3 is installed in the outer cylinder 1 on one side of the upper joint 4 through a piston ring 6 . The piston ring 6 is a three-lobe ring, and the piston ring 6 is sleeved on the piston 3 . The other end of the outer cylinder 1 is screwed with an upper ball seat 7 , and a cam 10 is installed in the outer cylinder 1 between the upper ball seat 7 and the piston 3 by a cam seat 8 and a cam pin 9 . The cam 10 can rotate around the cam pin 9 to a certain extent. The cam 10 is flat and convex. The bottom of the cam 10 is provided with an assembly groove 11 , and the assembly groove 11 is provided with a cam pin hole 12 .

[0018] One side of the upper ball seat 7 is provided with a lower ball seat 13, and the upper ball seat 7 and the lower ball seat 13 are threadedly connect...

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Abstract

The invention relates to a variable bent joint, and belongs to the technical field of an auxiliary fishing tool for a petroleum and natural gas well. The variable bent joint comprises an outer tube, a directional joint, a piston, an upper joint and a lower joint, wherein one end of the outer tube is provided with the upper joint through screw threads; the piston is arranged in the outer tube positioned at one side of the upper joint through a piston ring; the other end of the outer tube is provided with an upper ball seat through screw threads; and a cam is arranged in the outer tube positioned between the upper ball seat and the piston through a cam seat and a cam pin. In the use process of the variable bent joint, the bent corner action can be done, so that the problems that the existing tool can only be used for fishing fallen objects in a straight well or in the axial line direction of a well body and has a small use range and the problems of low repeated use rate and high cost of the existing fishing tool are solved. The variable bent joint has the advantages that the strength is high; greater pulling force, pressure and twisting force can be borne; the application range is wide; the variable bent joint can be matched with a drilling jar to be used; meanwhile, the back-off operation can be realized; and positive popularization significance is realized.

Description

technical field [0001] The invention relates to a variable bending joint, which belongs to the technical field of auxiliary fishing tools for oil and gas wells. Background technique [0002] In the production process of oil and water wells, downhole falling objects and downhole tools are often stuck due to various reasons. Various well falling objects affect the normal production of oil, gas, and water wells to a large extent, and may cause production shutdown in severe cases. With the rapid development of highly deviated wells and horizontal wells, due to factors such as tools, formations, and operations, Downhole accidents are more difficult to avoid. The salvage technology of downhole falling objects in horizontal wells, which is extremely difficult to deal with accidents, has gradually been paid attention to by people. Therefore, it is necessary to select corresponding fishing tools for different types of downhole falling objects to search out well falling objects and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/14
Inventor 夏成宇孙巧雷吕加华冯定王杰韩金权
Owner YANGTZE UNIVERSITY
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