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Back off device for casing

An undercut device and casing technology, which is applied in wellbore/well parts, earthwork drilling and production, etc., can solve the problems of lack of dismantling tools, production reduction of the whole well, difficulty in replacement and maintenance, etc., and achieve a reasonable structure and easy operation Effect

Pending Publication Date: 2019-09-06
通化红光石油机械有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the casing itself is damaged for some reason, it may lead to a reduction in production of the entire well or even scrap it
Oil well casings are corroded underground all the year round and individual casings are damaged during workover operations, making replacement and maintenance extremely difficult
In the past, when there was a problem with the casing, it was usually forced to be scrapped downhole, and there was no feasible removal tool

Method used

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  • Back off device for casing
  • Back off device for casing
  • Back off device for casing

Examples

Experimental program
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Embodiment Construction

[0018] see figure 1 -7, the names of the parts are as follows: upper joint 1, jaw connecting sleeve 2, sleeve 3 below the unloaded sleeve, planetary gear carrier 4, slip jacket 5, slip 6 (3 pieces), mandrel 7, Main cylinder 8, first gear frame 9, second cam structure 10, second gear frame 11, unloaded sleeve 12, lower joint 15, central shaft 16, cam sleeve 17, centering sleeve 18, pressure spring 19, centering Block 20 (3 pcs), pressure sleeve 21, spring 22, spring seat 23, bottom joint 24, second slip 30 (3 pcs), cam structure 31, mandrel section external gear 32, main cylinder section internal gear 33 , 34 planetary gears.

[0019] see figure 1 , 2 , Casing undercut device, including threaded upper body and lower body. The lower joint 15 of the upper body is threadedly connected with the central axis 16 of the lower body.

[0020] see figure 1 , 3 , 4, 5, the upper body is sequentially threaded with a hollow upper joint 1, a mandrel 7 and a lower joint 15. The outsid...

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Abstract

The invention relates to oil field workover tools, and discloses a back off device for casing. The back off device comprises an upper body and a lower body which are connected in a threaded mode, theupper body is sequentially connected with an upper joint, a mandrel and a lower joint, a tooth insertion connecting sleeve and a main cylinder body sequentially sleeves the mandrel, slips capable of extending are connected to the main cylinder body, and are distributed along the circumference at intervals, and a planetary gear device is connected between the main cylinder body and the mandrel in atransmission mode; the lower body is sequentially connected with a central shaft and a bottom joint, second slips capable of extending are on the central shaft in the radial direction, the second slips are distributed in the circumference at intervals, wiper blocks capable of extending in the radial direction are arranged on the central shaft, the wiper blocks are distributed in the circumferenceat intervals and supported by pressing springs, the wiper blocks extend out of a wiper sleeve, and the wiper sleeve is connected with the bottom joint by a spring in the axial direction. The lower joint is connected with the central shaft through a thread. A special tool is provided, casings at any position in a downhole can be shackled and taken out, the tool is reasonable in structure, applicable, convenient to operation, safe and reliable, and worth popularizing.

Description

technical field [0001] The invention relates to an oil field workover tool, that is, a casing undercut device. Background technique [0002] In the prior art, the petroleum casing is mainly used for supporting the well wall during the drilling process and after the completion of the well, so as to ensure the progress of the drilling process and the normal operation of the entire oil well after the completion of the well. Once the casing itself is damaged for some reason, it may lead to a reduction in production of the entire well, or even scrap it. Oil well casings are corroded underground all the year round and individual casings are damaged during workover operations, making replacement and maintenance extremely difficult. In the past, if there was a problem with the casing, it was usually forcibly scrapped downhole, and there was no feasible removal tool. Contents of the invention [0003] The object of the present invention is to provide a casing back-off device for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/00
CPCE21B23/00
Inventor 唐福彬才艳梅才永存李刚
Owner 通化红光石油机械有限责任公司
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