Branched selective reentry method and apparatus

A branch well, selective technology, applied in directional drilling, earthwork drilling, wellbore/well components, etc., can solve the problems of difficult completion and workover of branch wells, high risk, complex construction procedures, etc., to achieve Ease of implementation, reliable sealing, and reduced construction risks

Inactive Publication Date: 2007-03-21
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Abstract
  • Description
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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 selective reentry method and apparatus
  • Branched selective reentry method and apparatus
  • Branched selective reentry method and apparatus

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specific Embodiment approach

[0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: The following will be described in conjunction with the accompanying drawings.

[0008] As shown in the figure: the branch well selective reentry device adopted in the present invention consists of a body 1, a piston 2, a push rod 3, a gland 4, a hollow fixed pin 5, a guide head 6, a connecting rod 7, a guide shoe 8 and a sealing wire Block 9 composition. Its connection and assembly relationship are as follows: piston 2 is installed in the cavity of body 1, and push rod 3 is arranged on the outside of piston 2, which is inserted into the key groove on the middle side of body 1 through a square hole, and the push rod 3 and the outside of the key groove are closed with gland 4. The surroundings are fixed with screws; a pair of symmetrical ear-shaped bodies at the lower part of the body 1 are connected and fixed with the guide head 6 through the hollow fixing pin 5; Screw thread is connected with connecting rod 7, and con...

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Abstract

The present invention relates to a branch hole selective reentry method for making downhole remedial operation of complex gas-oil well and its equipment. Said equipment is formed from self-body, piston, push rod, gland, hollow fixed pin, guide head, connecting rod, guide shoe and sealing plug. Said invention also provides the concrete working principle of said equipment, and the utilization of said method and equipment can smoothly make the work string be fed into branch well and implement following construction operations.

Description

Technical field: [0001] The invention relates to a method and a device for re-entering the wellbore of a workover tool during workover operations of oil and gas wells with complex body structures such as branch wells, shark fin wells, and horizontal wells in oil fields, and belongs to the category of downhole operation technical tools for oil and gas exploitation. Background technique: [0002] As oilfield development enters the middle and later stages, in order to enhance oil recovery, there are more and more oil and gas wells with special wellbore structures such as branch wells and horizontal wells. Special technology wells are characterized by complex wellbore structures, and most wellbores are horizontal or highly deviated. The biggest problem encountered in this kind of oil and gas well workover operation is how to selectively enter the branch wellbore for workover operations. If the conventional technology cannot enter the branch wellbore, it may also cause complex do...

Claims

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Application Information

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