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Lead-in device of branch mechanism for six-stage branch well

A leading-in device and branch well technology, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problems that the window hydraulic sealing and mechanical integrity cannot be realized, and achieve wide development and accuracy. High and low construction risk

Inactive Publication Date: 2010-05-19
CNPC GREATWALL DRILLING ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a six-level branch well bifurcation mechanism introduction device, which solves the problem of hydraulic sealing and mechanical integrity of the window that cannot be realized in the four-level branch well completion system in the prior art

Method used

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  • Lead-in device of branch mechanism for six-stage branch well
  • Lead-in device of branch mechanism for six-stage branch well

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Embodiment Construction

[0008] In the figure, a six-stage branch well bifurcation mechanism introduction device is composed of a branch wellbore string 1, a branch wellbore introduction shoe 2, a main wellbore introduction shoe 3, a main wellbore string 4, and a bifurcation connection mechanism 5; The bifurcation connection mechanism 5 is made of expandable alloy material, which has expandability and high mechanical strength; the branch shaft guide shoe 2 is provided with an oblique structure, and the main shaft guide shoe 3 is characterized by eccentric Structure; the bifurcated connection mechanism 5 and the main wellbore string 4 are welded; the main wellbore string 4 and the main wellbore guide shoe 3 are fastened and connected with pins, and the branch wellbore guide shoe 2 and the branch wellbore string 1 are fastened with pins connection, the bifurcation connection mechanism 5 is connected to the branch wellbore string 1 by welding; the present invention mainly introduces the downhole bifurcati...

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Abstract

The invention discloses a lead-in device of the branch mechanism for a six-stage branch well used in the well completion of an oil-field oil-gas multi-stage branch well, which consists of a branch connecting mechanism, a main pitshaft pipe column, a main pitshaft lead-in guiding shoe, a branch pitshaft lead-in guiding shoe and a branch pitshaft pipe column, wherein the branch connecting mechanism is made of expandable alloy materials; the branch pitshaft lead-in guiding shoe is provided with an oblique opening structure; the main pitshaft lead-in guiding shoe is provided with an eccentric structure; the branch connecting mechanism is welded with the main pitshaft pipe column; the main pitshaft pipe column is fastened with the main pitshaft lead-in guiding shoe by dowels; the branch pitshaft lead-in guiding shoe is fastened with the branch pitshaft pipe column by the dowels; and the branch connecting mechanism is welded with the branch pitshaft pipe column. The device solves the problem that the four-stage branch well in the prior art cannot realize water conservancy tightness and mechanical integrity of windows. The lead-in device can be widely used in the well completion of the oil-field oil-gas multi-stage branch well.

Description

Technical field: [0001] The invention relates to a six-stage branch well bifurcation mechanism introduction device for drilling and completion of oil and gas multi-branch wells in oil fields. Background technique: [0002] The branch wells are characterized by complex wellbore structures, and most of the wellbore trajectories are horizontal wells and highly deviated wells. The branch well has the characteristics of large contact area between the wellbore and the reservoir, and high single well production. At present, branch well technology is widely promoted in oil fields at home and abroad, and great economic benefits have been achieved. In the well completion operation, the TAML4 branch well system is mainly used at present. The completion of the four branch well meets the requirements of the current reservoir development and oil production technology. The TAML4 branch well cannot realize the hydraulic sealing and mechanical integrity of the window. TAML level 6 lateral w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B41/00
Inventor 苏涛邓旭薛志永李敏孟庆华高玮余雷张云怡陆斌
Owner CNPC GREATWALL DRILLING ENG
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