Branched well selective guiding in tool

A tool-introducing and selective technology, applied in directional drilling, wellbore/well components, earth-moving drilling, etc., can solve the problems of difficult completion and workover operations of lateral wells, complicated construction procedures, and high risks, reducing the Construction risk, simplified construction process, reliable work effect
CN1932230AInactive Publication Date: 2007-03-21LIAOHE GASOLINEEUM EXPLORATION BUREAU
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
LIAOHE GASOLINEEUM EXPLORATION BUREAU
Publication Date
2007-03-21
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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 wells with special well structures such as lateral wells and horizontal wells are increasing. 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 complicate...

Claims

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