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Plug, holding member, and pit excavation method using the same

A technology for retaining components and plugs, which is applied in earthwork drilling, engine components, engine sealing, etc., and can solve problems such as inability to obtain effects and damage of downhole plugs

Active Publication Date: 2021-02-05
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Furthermore, in the case of a downhole tool that blocks a wellbore with an elastic member, if the deformation of the elastic member is not controlled, there is a problem that the desired effect cannot be obtained due to unexpected deformation of the elastic member, and at worst Otherwise, it will cause damage to other parts constituting the downhole plug

Method used

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  • Plug, holding member, and pit excavation method using the same
  • Plug, holding member, and pit excavation method using the same
  • Plug, holding member, and pit excavation method using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085]

[0086] As the downhole plug of Example 1, a downhole plug (A) having the configuration described in the above-mentioned embodiment was prepared. It should be noted that the mandrel, the sealing member sleeve, and the cone are made of PGA, the pair of slide cards and the pair of fixing members are made of magnesium alloy, and the sealing member is made of polyurethane rubber.

[0087]

[0088] Actuation is performed to secure the downhole plug (A) within the housing. Then, it was investigated: after heating the casing to a temperature of 93°C and sealing water into the casing, and applying a water pressure of 10,000 psi (about 70 MPa) to the downhole plug (A) through a pump, whether the downhole plug (A) can Keep the water pressure on for 30+ minutes. Then, if the downhole plug (A) can maintain the water pressure for more than 30 minutes, then the evaluation is good "0", and if the water pressure cannot be maintained for more than 30 minutes, then the evaluation i...

reference example 1

[0092]

[0093] As the downhole plug of Reference Example 1, a casing having the same configuration as that of the downhole plug (A) was prepared, except that the inner and outer peripheral edges of the casing protruded toward the sealing member side but were composed of a single member. Downhole plug (B). Then, the water pressure resistance test and the sealing member outflow suppression effect were evaluated by the same procedure as in Example 1. The results are shown in Table 1.

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PUM

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Abstract

The present application provides a plug that does not cause damage or other effects on components constituting the plug when blocking a well hole. The downhole plug (10) has: a hollow mandrel (1); an annular sealing member (2), assembled on the outer peripheral surface of the mandrel (1), deformed under pressure; The outer peripheral surface of (1) is fitted adjacent to the annular seal member (2) on the downstream side of the pressure received by the seal member (2). The sleeve (3) is formed to include: an inner portion (31) of the sleeve, which is in contact with the outer peripheral surface of the mandrel (1); and an annular outer portion (32) of the sleeve, which has a The inner diameter is the same as or greater than that of the inner part (31) of the pipe sleeve, and is movably assembled on the inner part (31) of the pipe sleeve. The sleeve outer portion (32) has a surface opposite to the sealing member (2).

Description

technical field [0001] The present invention relates to a plug and a holding member for pit excavation, and a pit excavation method using the plug. Background technique [0002] Various tools called downhole tools have been developed in order to block and fix well holes for extracting shale oil / gas by hydraulic fracturing or the like. As one of these downhole tools, a downhole plug is known. One of the functions of the downhole plug is that the specified members constituting the downhole plug abut against the inner wall of the well hole, the downhole plug is fixed to the well hole, and the well is blocked by the elastic member constituting the downhole plug, etc. hole (for example, Patent Document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: US Patent Application Publication No. 2011 / 0277989 (published on November 17, 2011) Contents of the invention [0006] The problem to be solved by the invention [0007] Furthermore, in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/128F16J15/06F16J15/10
CPCE21B33/1216E21B2200/08E21B33/128F16J15/06F16J15/10E21B33/12E21B33/1293E21B33/129
Inventor 小林征志郎吉井辉明
Owner KUREHA KAGAKU KOGYO KK