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Returnable tubing sealing salvage gear

A salvage device and tubing technology, applied in wellbore/well components, earthwork drilling, etc., can solve the problems of affecting the radial force of circular slips, single applied force, poor sealing, etc., and achieve reliable sealing salvage, maintenance and replacement. handy effect

Inactive Publication Date: 2014-07-09
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] After the retractable tubing sealing fishing device is lifted out of the wellhead, it can continue to work in the well with simple maintenance. During the fishing process, the seal between the spear and the inner wall of the fallen fish is very important. The round slips are in close contact with the inner wall of the fish and the radial force is generated to bite the fish to achieve salvage. The applied force is single and the sealing is poor, which affects the radial force generated by the round slips on the inner wall of the fish, thereby affecting the stability of fishing. sex and success

Method used

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  • Returnable tubing sealing salvage gear

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Embodiment 1

[0023] Such as figure 1 As shown, in order to solve the technical problem that the existing large-diameter pipe string and open gas well production pipe string are cut into the snubbing device cavity with cutting tools, and the cut tubing cannot be salvaged with ordinary fishing spears, The designed retractable tubing sealing fishing device includes a lance 7, the outer surface of the lower part of the lance 7 is provided with a sealing cup 5, and the sealing cup 5 can realize the protection between the fishing tool and the tubing during fishing. The sealing of the inner wall gap; the lower end of the lance 7 is also provided with a guide shoe 6, and the sealing cup 5 is arranged on the upper end of the guide shoe 6, and the concave surface of the seal cup 5 is towards an end of the guide shoe 6, so that it can be more Seal the gap between the fishing tool and the oil pipe well; a protrusion 8 surrounding the outer diameter of the spear shaft 7 is arranged between the sealing ...

Embodiment 2

[0026] A sealing cup 5 is designed on the lance 7 of the tubing sealing fishing tool. During the fishing operation, the lower pressure of the sealing cup 5 is greater than the upper pressure, and the sealing cup 5 expands to seal the gap between the fishing tool and the tubing inner wall.

[0027] When the tool guide shoe 6 guides the tool into the fish cavity, the round slips 2 are compressed to generate a certain external expansion force, making the round slips 2 stick to the inner wall of the falling object. When the drilling tool is lifted, the mandrel 4 and the round slips The zigzag threads on 2 coincide with each other, and make the slips generate radial force, and bite the inner wall of the fallen fish to realize salvage; The zigzag thread on the mandrel 4 is disengaged, and then the drilling tool is rotated forward for 2-3 circles, the circular slip 2 and the mandrel 4 produce relative displacement, and the circular slip 2 is moved downward along the zigzag thread of t...

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Abstract

The invention belongs to the technical field of gas field workover under pressure, and particularly relates to a returnable tubing sealing salvage gear. The returnable tubing sealing salvage comprises a spear, and sealing cups are arranged on the outer surface of the lower portion of the spear. By the arrangement of the sealing cups on the spear, the space between the spear and the inner wall of a tubing can be sealed through the sealing cups, and reliable sealing salvage is guaranteed; by the design of the sealing cups, lower pressure of the sealing cups is larger than the upper pressure during salvage operation, and sealing of the returnable tubing sealing salvage gear and a gap of the inner wall of the tubing can be realized; the sealing cups are detachable and are in threaded connection through a screw thread, so that maintenance and replacement are facilitated.

Description

technical field [0001] The invention belongs to the technical field of gas field workover under pressure, and in particular relates to a retractable oil pipe sealing fishing device. Background technique [0002] Existing large-diameter pipe strings and open gas well production pipe strings are cut into the snubbing device cavity with cutting tools, and the cut tubing cannot be salvaged with ordinary fishing spears. [0003] For this reason, people have developed a kind of reversible tubing seal salvage device, and it comprises the upper joint 1 that is arranged on the top of the lance, the mandrel 4 that is arranged in the middle of the lance, the round slip 2 that is arranged on the outside of the mandrel 4, The release ring 3 arranged at the lower end of the mandrel 4 and the guide shoe 6 arranged at the lower end of the lance. [0004] The specific use process of the retractable tubing sealing fishing device is as follows: when the guide shoe guides the fishing tool into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/20
Inventor 徐迎新谢涛韩静静柳志勇杨红斌席仲琛
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO