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Branched well selective guiding in tool

A tool-introduced and selective technology, applied in directional drilling, wellbore/well components, earthwork drilling and production, etc., can solve problems such as complex construction procedures, high risks, difficulties in branch well completion and repair and merging operations, and achieve Reduce construction risk, work reliably, and simplify construction procedures

Inactive Publication Date: 2008-07-16
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is accurate and reliable, but the disadvantage is that after the re-entry operation is completed, the pre-set guiding device needs to be recovered, the construction process is complicated, and the risk is high. Wellbore completion and workover operations bring difficulties

Method used

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  • Branched well selective guiding in tool

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Embodiment Construction

[0007] Describe below in conjunction with accompanying drawing.

[0008] As shown in the figure: the branch well selective introduction tool used in the present invention consists of an upper casing 1, a central rod 2, a spring 3, a sliding sleeve 4, a crankshaft 5, a fixed pin 6, a guide head 7, a connecting rod 8, and a guide shoe 9 , sliding pin 12, and sealing ring 13, and its connection and assembly relations are as follows: a central rod 2 is arranged in the cavity of the upper housing 1, and the upper end of the central rod 2 is placed on the upper side of the inner circular surface boss of the upper housing 1, and the lower end is externally threaded It is connected with the internal thread at the upper end of the sliding sleeve 4, and a spring 3 is installed between the upper housing 1 and the sliding sleeve 4; a sealing ring 13 is installed in the upper sealing ring groove on the outer surface of the sliding sleeve 4, and a long groove in the inner cavity of the slidi...

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Abstract

The present invention relates to a branch hole selective leading-in equipment for making downhole remedial operation of branch hole. Said equipment is formed from the following several portions: upper shell body, central rod, spring, sliding sleeve, crankshaft, fixed pin, guide head, connecting rod, guide shoe, sliding pin and sealing ring. Said invention also provides the connection mode of all the above-mentioned portions. The invented leading-in equipment is reliable in operation, can be used for smoothly making the work string be fed into branch hole.

Description

Technical field: [0001] The invention relates to a downhole tool used for introducing a workover tool into a wellbore in an oil-gas well with a complex wellbore structure in an oil field, especially a branch well, and belongs to the category of downhole tools for oil-gas well operations. Background technique: [0002] As oilfield development enters the middle and later stages, in order to enhance oil recovery, oil and gas with special well structures such as lateral wells and horizontal wells are increasing day by day. The branch well is characterized by a complex wellbore structure, and most of the wellbore trajectories are horizontal well sections and highly deviated well sections. The biggest problem encountered during the workover operation of this kind of oil and gas well is how the workover tool selectively enters the lateral wellbore for the workover operation. If the conventional technology is used, the lateral wellbore cannot be entered, and it may also cause compl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B41/10
Inventor 王春杰李敬东朱太辉陈振刚
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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