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Selective entry device and multilateral well system provided with same

A technology for entering the device and branch, which is applied in drilling equipment, directional drilling, wellbore/well components, etc., and can solve the problem of difficult operation of branch well drilling

Pending Publication Date: 2019-09-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a selective entry device and a branch well system with it to solve the problem that branch well drilling is not easy to operate in the prior art

Method used

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  • Selective entry device and multilateral well system provided with same
  • Selective entry device and multilateral well system provided with same
  • Selective entry device and multilateral well system provided with same

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] Such as figure 2 with image 3 As shown, the embodiment of the present invention provides a selective access device, which includes a guide block 10 and a blocking block 20 . Wherein, the guide block 10 has a first guide surface 11, the cross-sectional area of ​​the rear end of the g...

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PUM

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Abstract

The invention provides a selective entry device and a multilateral well system provided with the same. The selective entry device comprises a guide block and a plugging block, wherein the guide blockis provided with a first guide surface, the section area of the rear end of the guide block is greater than that of the front end of the guide block, and the guide block is used for being matched witha lower joint of a bifurcation device so as to guide a drilling tool; and the plugging block is connected with the rear end of the guide block and used for plugging one branch of the bifurcation device. By means of the technical scheme, the problem that in the prior art multilateral well drilling is difficult to operate can be solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a selective access device and a branch well system with the same. Background technique [0002] With the rapid development of branch well technology, the currently applied branch well system is facing more and more limitations. The sidetracking process of branch wellhole opening is complicated, and the metal debris generated during the window opening process has become a complex downhole accident. The important reason is that it is difficult to guarantee the sealing of the window of the branch well, and it is difficult to realize the later reconstruction, which limits the technical advantages of the branch well, and the current implementation cost of the branch well is high. of many problems. [0003] In the prior art, there is a bifurcation device that can realize downhole mechanical seal and hydraulic seal. A stable and sealed branch well window is formed, ...

Claims

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Application Information

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IPC IPC(8): E21B7/06E21B7/00E21B33/13
CPCE21B7/00E21B7/061E21B33/13
Inventor 党文辉许江文刘颖彪路宗羽张文波石建刚李杰陈伟峰杨玉梅
Owner PETROCHINA CO LTD
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