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Tool used for taking casing underground at fixed point and using method

A casing and tool technology, which is applied in the field of downhole fixed-point casing extraction tools, can solve problems such as insufficient torque and inability to achieve fixed-point casing extraction, and achieve the effects of short working cycle, humanized structural design, and safe and reliable construction.

Active Publication Date: 2016-03-09
PANJIN YONGSHENGLI PETROLEUM TECH DEV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art above, the present invention provides a tool for downhole fixed-point casing removal and its use method, which solves the problem that fixed-point casing removal cannot be realized due to insufficient torque during construction, and is easy to operate ,Positioning accuracy

Method used

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  • Tool used for taking casing underground at fixed point and using method
  • Tool used for taking casing underground at fixed point and using method
  • Tool used for taking casing underground at fixed point and using method

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Such as Figure 1~Figure 3 As shown, a tool for downhole fixed-point casing extraction includes: planetary reducer 1, collar locator 2, compensator 3, lower anchoring device 4, the lower end of planetary reducer 1 and the collar locator 2 The upper end is connected by thread, the lower end of the collar positioner 2 is connected with the upper end of the compensator 3 by thread, and the lower end of the compensator 3 is connected with the upper end of the lower anchoring device 4 by thread.

[0032] The planetary reducer 1 is composed of an input assembly 11, an anchor 12, a reduction mechanism 13 and an output assembly 14; the reduction mechanism 13 is connected with the input assembly 11, the anchor 12, the output assembly in sequence into 14; the reduction mechanism 13 is composed of a camshaft gear frame 131, a central sha...

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Abstract

The invention discloses a tool used for taking a casing underground at a fixed point and a using method, belongs to the technical field of a process of taking the casing underground, relates to the tool for taking the casing underground in an oil field and the using method, in particular to the tool used for taking the casing underground at the fixed point and the using method. The tool solves the problem that the casting cannot be taken at the fixed point due to insufficient torque in a construction process, is simple to operate and accurate in positioning. The tool comprises a planetary reducer, a collar locator, a compensator and an anchoring device, which are in threaded connection from top to bottom in sequence. The using method comprises the following steps: step I, feeding the tool used for taking the casing underground at the fixed point into a predetermined depth which needs replacing the casing by virtue of a ground workover operating vehicle; step II, determining a casing collar position; step III, lifting a tubular column to reach load for replacing the casting; and step IV, pulling out the tool used for taking the casing underground at the fixed point and the replaced casing.

Description

technical field [0001] The invention belongs to the technical field of downhole casing extraction technology, and relates to an oil field downhole casing replacement tool and a use method, in particular to a fixed-point downhole casing extraction tool and a use method. Background technique [0002] During the workover process, the casing needs to be replaced due to other reasons such as casing damage and corrosion within tens of meters of the surface. The conventional method is to use the overhaul equipment to lift the back-off at the middle joint point. The back-off error of this method is uncertain, and it often takes several times of back-off to complete the casing work; another method is to cut the casing by running a cutting tool. Cut and take out, and then salvage and buckle to take out the remaining part of the cut casing; the above casing construction requires the cooperation of overhaul equipment, and the construction is cumbersome, the overhaul construction cost is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/00
CPCE21B23/00
Inventor 刘建勇王杰魏后超刘继海马海禹闫鹏翱孟刚邢德利张洪滨刘鑫刘雪乔孟繁举闫星维张德培吴明泽安柏正安家宁于慧明杨滨宇胡衔宇赵丹枫刘明坤杨阳
Owner PANJIN YONGSHENGLI PETROLEUM TECH DEV
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