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Downhole expansion tool for sleeve and method for using downhole expansion tool for sleeve to expand sleeve

A technology of cased wells and tools, which is applied to earth-moving drilling, wellbore/well components, production fluids, etc. Completion cost, convenient operation, and the effect of convenient operation

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the casing sequence of the wellbore structure, as the number of casing layers in the well increases, the size of the casing will gradually decrease, the size of the wellbore will also continue to shrink, and the taper of the wellbore will continue to increase. Deep wells and complex wells cannot successfully drill to the target layer or the size of the wellbore is too small, which affects later production operations

Method used

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  • Downhole expansion tool for sleeve and method for using downhole expansion tool for sleeve to expand sleeve
  • Downhole expansion tool for sleeve and method for using downhole expansion tool for sleeve to expand sleeve
  • Downhole expansion tool for sleeve and method for using downhole expansion tool for sleeve to expand sleeve

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with accompanying drawing.

[0045] figure 1 The structure of the first embodiment of the casing downhole expansion tool 10 (hereinafter referred to as the expansion tool 10 ) according to the present invention is schematically shown. Such as figure 1 As shown, the expansion tool 10 includes an expansion assembly for expanding the casing 11 and a driving assembly for driving the expansion assembly to expand, which will be described in detail below.

[0046] The drive assembly includes a central tube 101 , a core tube 102 and an outer tube 103 which are sequentially fitted from inside to outside. The core tube 102 is fixedly connected with a drill rod (not shown), and the central tube 101 communicates with the drill rod. Here, the drill rod is a hollow drill rod for injecting liquid into the expansion tool 10 . The downstream end of the central tube 101 can be closed, and a liquid transfer hole 104 i...

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Abstract

The invention relates to a downhole expansion tool for a sleeve and a method for using the downhole expansion tool for the sleeve to expand the sleeve. The downhole expansion tool for the sleeve comprises an expansion assembly and a driving assembly, wherein the expansion assembly is used for expanding the sleeve, and the driving assembly is used for driving the expansion assembly to carry out expansion operation. According to the downhole expansion tool for the sleeve, when well drilling is carried out, the borehole size can be kept to be constant, constant hole diameter drilling and well completion operation of a whole well are achieved, and the downhole expansion tool for the sleeve is particularly applicable to construction of deep wells, extra-deep wells and complex wells.

Description

technical field [0001] The invention relates to a drilling and completion device, in particular to a casing downhole expansion tool. The present invention also relates to a method for realizing casing expansion using the casing downhole expansion tool. Background technique [0002] In traditional oil and gas field drilling operations, in order to drill safely and reach the target layer smoothly, it is necessary to run casing into the well to achieve formation sealing. Therefore, in the casing sequence of the wellbore structure, as the number of casing layers in the well increases, the size of the casing will gradually decrease, the size of the wellbore will also continue to shrink, and the taper of the wellbore will continue to increase. Deep wells and complex wells cannot successfully drill to the target layer or the size of the wellbore is too small, which affects the later production operations. [0003] Therefore, in order to realize the uniform borehole size and compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/00
CPCE21B43/105E21B43/103
Inventor 李作会唐明吴柳根马建忠蔡鹏彭志刚朱万胜唐成磊滕照正宁学涛朱海波沈学祥
Owner CHINA PETROLEUM & CHEM CORP
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