A tool for downhole fixed-point casing extraction and its application method
A casing and tool technology, which is applied in the field of downhole fixed-point casing extraction tools, can solve the problems of inability to achieve fixed-point casing extraction and insufficient torque, and achieve the effects of humanized structural design, short working cycle, and safe and reliable construction
Active Publication Date: 2017-11-28
PANJIN YONGSHENGLI PETROLEUM TECH DEV
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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
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[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] like 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 shaft ...
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The present invention belongs to the technical field of underground sleeve extraction processes and relates to tools for replacing an underground sleeve in an oil field and methods for using the same, and in particular, to a tool for underground set-point sleeve extraction and a method for using the same. By the invention, the problem that it cannot take out a sleeve at a set point due to insufficient torque during construction is solved, moreover, the operation is simple and the positioning is accurate. The tool according to the invention comprises: a planetary reduction gear, a collar locator, a compensator and a lower anchoring device, which are connected in turn via screw thread from top to bottom. The method for using the tool according to the invention comprises: step 1, lowering, by an aboveground well-workover vehicle, the tool for underground set-point sleeve extraction to a preset depth at which a sleeve is to be replaced; step 2, determining the location of the sleeve collar; step 3, lifting the pipe column to the load of the sleeve to be replaced; and step 4, lifting out the tool for underground set-point sleeve extraction and the sleeve to be replaced.
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...
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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