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A split-leg method for running a herringbone sealing device for branch wells

A sealing device and branch well technology, which is applied to earth-moving drilling, wellbore/well components, etc., can solve the problems of jamming, inconsistent speed of split legs, etc., to prevent instability, deformation and crowding, easy operation, and reliable running. effect in place

Active Publication Date: 2016-09-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the running speed of the herringbone sealing device is inconsistent with the splitting speed of the herringbone sealing device, the problem of jamming is prone to occur. How to realize the reliable lowering and splitting of the herringbone sealing device in the later stage is always a difficult problem to solve

Method used

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  • A split-leg method for running a herringbone sealing device for branch wells

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Embodiment Construction

[0008] Such as figure 1 As shown, a branch well uses a herringbone-shaped sealing device to run the split-leg method. The method steps are as follows: After the two branch wellbores of the branch well are drilled, the lower edge 3 of the branch well window is formed at the branch well window, and the fixed-point split-leg mechanism 2. The upper part is cone-shaped or wedge-shaped, and the upper part of the cone-shaped or wedge-shaped has smooth chamfers. Install the fixed-point leg splitting mechanism 2 on the upper part of the lower edge of the branch well window 3 to ensure that the herringbone sealing device 1 is connected to the lower edge of the branch well window. 3. The front two legs at the apex of the tip are reliably separated to avoid damage to the herringbone sealing device 1; the herringbone sealing device 1 is made of high plastic material and has good deformation ability without damage; the fixed-point leg separation mechanism 2 is located in the herringbone seal...

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Abstract

The invention relates to a drilling and completion method for petroleum, natural gas, shale gas and coalbed methane, in particular to a method for running a herringbone-shaped sealing device into a branch well. The steps of the method are as follows: after the two branch wellbores of the branch well are drilled, the lower edge of the window of the branch well is formed at the window of the branch well, the upper part of the fixed-point splitting mechanism is conical or wedge-shaped, and the upper part of the taper or wedge has a smooth chamfer , Install the fixed-point leg splitting mechanism on the upper part of the lower edge of the branch well window to ensure that the herringbone sealing device is reliably separated from the front two legs along the tip apex when it goes down to the branch well window to avoid damage to the herringbone sealing device. The invention realizes that the separation speed of the two legs of the herringbone sealing device is synchronized with the running speed of the pipe string, avoids the problem of jamming, prevents the herringbone sealing device from being unstable, deformed and crowded when it is in a compressed state, and ensures the reliable running of the herringbone sealing device In place, simple structure, easy to operate.

Description

Technical field: [0001] The invention relates to a drilling and completion method for petroleum, natural gas, shale gas and coalbed methane, in particular to a method for running a herringbone-shaped sealing device into a branch well. Background technique: [0002] With the rapid development of branch well technology, the hydraulic sealing requirements of branch well window connections are getting higher and higher. The existing high-level branch well technology mostly adopts the method of first installing a herringbone sealing device in the downhole, and then drilling into multiple branches. Therefore, the accuracy of the construction orientation and depth of each branch at the window is not high, and the installation of the sealing device is relatively simple. However, this method of constructing high-level lateral wells is only applicable to new wells, and has the disadvantage of low window strength. In comparison, the method of completing the drilling of two branch well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B23/00
Inventor 邓旭余雷王馨萍尚宪飞李敏李跃邓小立胡靖高扬张宗仁赵展吴宁张雪刘岩强孔栋梁严仁田李虎赵云蒋红波夏泊洢邵建红
Owner BC P INC CHINA NAT PETROLEUM CORP
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