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Branching device for parent well, its manufacturing method and method for drilling branch well using it

A branching device and branching technology, applied in earth-moving drilling, wellbore/well components, directional drilling, etc., can solve the problems of narrow welding operation space and inconvenient production, and achieve the effect of improving the success rate, convenient operation and cost saving

Active Publication Date: 2016-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welding position between the round tube and the partition plate arranged between the round tubes is an arc and the welding operation space is extremely narrow, which brings inconvenience to production

Method used

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  • Branching device for parent well, its manufacturing method and method for drilling branch well using it
  • Branching device for parent well, its manufacturing method and method for drilling branch well using it
  • Branching device for parent well, its manufacturing method and method for drilling branch well using it

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with accompanying drawing.

[0035] figure 1 A parent well branching device 10 according to the present invention is schematically shown. The parent well branching device 10 includes a joint 11 , for example, a joint with a different diameter can be selected, and a branch structure is installed at the downstream end of the joint 11 . exist figure 1In the illustrated embodiment, the branch structure comprises two rolls 12 , 14 . The first end 16 of the roll is connected to the downstream end of the joint 11 , and the second end 17 is free. The branch structure also includes a partition plate 50 . Partition plate 50 is arranged between roll-shaped body 12,14 and forms two branch pipes 18,19, as figure 2 shown. The structure of the branch pipes 18, 19 will be described in detail below.

[0036] Figure 4 The structure of the roll 12 is schematically shown. Such as Figure 4 As shown, the roll-s...

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Abstract

The invention relates to a parent well branching device which comprises a joint, wherein a branching structural part is mounted at the downstream end part of the joint; the branching structural part comprises at least two rolled bodies and a separation plate arranged between the rolled bodies and connected to the cut marks of the rolled bodies; the first end parts of the rolled bodies and the first end part of the separation plate are connected to the joint, so as to form branch pipes connected to the joint. The parent well branching device increases the success ratio for drilling branch wells, requires no expansion tools, facilitates operation, and reduces cost. The invention further relates to a manufacturing method of the parent well branching device and a method for drilling branch wells by using the parent well branching device.

Description

technical field [0001] The invention relates to a branch well construction device, in particular to a parent well branch device. The present invention also relates to the manufacturing method of the parent well branching device and the method of using it to drill branch wells. Background technique [0002] The lateral well technique drills two or more wellbores into a reservoir on the side of a main wellbore in order to drain multiple reservoirs. In terms of reservoir engineering, branch well technology can increase the exposed area of ​​the reservoir, improve the oil drainage efficiency, improve the dynamic profile of oil flow, reduce the coning effect, improve the effect of gravity drainage, and vertically adjust the production of the reservoir. From the perspective of drilling, it can reduce invalid well sections, reduce the relocation of drilling equipment, and save casing and mud costs. In addition, for offshore projects, the wellhead slots of offshore platforms can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/06E21B41/00E21B43/10
Inventor 王敏生黄辉张映红屈耀明思娜唐冠伟蒋庞露
Owner CHINA PETROLEUM & CHEM CORP