A kind of expansion equipment for downhole branch system

A branch system and equipment technology, applied in wellbore/well components, earthwork drilling and production, etc., can solve the problems of lack of mechanical integrity, hydraulic integrity and re-entry ability, and achieve convenient downhole, small size, and cost reduction Effect

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

[0005] TAML2 level: casing is run in the main wellbore of the well completion and cement is injected, and no cement is injected in the open hole or only the screen in the branch wellbore. The mechanical support of the connection is stronger than that of the first level, but it does not have mechanical integrity and hydraulic integrity. and re-entry capabilities

Method used

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  • A kind of expansion equipment for downhole branch system
  • A kind of expansion equipment for downhole branch system
  • A kind of expansion equipment for downhole branch system

Examples

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Embodiment Construction

[0032] figure 1 An overall schematic diagram of the expansion device 100 of the downhole lateral system according to the present invention is shown. As shown in the figure, the downhole branch system expansion device according to the present invention includes an uphole power and control unit 1 , an operating unit, a piston assembly and an expansion assembly 9 in order from top to bottom. Wherein, the working unit includes a power supply control module 4 , a hydraulic pump 5 and a positioning and grasping joint 6 from top to bottom. In the illustrated embodiment, the power supply control module 4 is connected with the uphole power and control unit 1 through the cable 2 and the cable joint 3 . The piston assembly includes a piston cylinder 7 and a piston rod 8 . These are well known to those skilled in the art, so detailed descriptions are omitted here.

[0033] It should be noted that, in the description of the present invention, both "upper" and "lower" refer to figure 1 ...

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Abstract

The invention relates to an expansion device for a downhole branching system. The maximum radial size of an expansion assembly formed by combining all expansion unit elements is smaller than the sum of the respective maximum radial dimensions of each expansion unit. The invention uses hydraulic oil to push the piston as the driving source, and pushes the expansion unit connected with the piston rod into the outlet part to expand. When the expansion device is used to expand and shape the downhole branch system, it has the advantages of small size and convenient downhole. It is suitable for the downhole branch system where the size of the pipe string above the inlet of the outlet is smaller than the sum of the sizes of all outlets after expansion. Therefore, small size can be selected. The size of the upper pipe string, thereby reducing the cost significantly.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling and production, and relates to an expansion device for an underground branch system. Background technique [0002] Multi-lateral well technology is a main wellbore sidetracked to drill two or more wellbores into the reservoir, which can realize multi-reservoir oil drainage. 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. In terms of drilling engineering, it not only reduces the relocation of invalid well sections and drilling equipment, but also saves the cost of casing and mud, and makes full use of the wellhead groove of the offshore platform, reducing the platform construction cost. In terms of surface engineering, it can grea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B29/10
Inventor 王敏生黄辉思娜光新军
Owner CHINA PETROLEUM & CHEM CORP
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