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Bridge connection type packer for testing crack caused by hydraulic pressure of minor-diameter rock

A hydraulic fracturing and packer technology, applied in sealing/isolation, production fluid, wellbore/well components, etc., can solve problems such as high-pressure liquid and test equipment installation, equipment diameter is too large, etc., to achieve structural Simple, easy-to-assemble effect

Pending Publication Date: 2018-12-14
NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] For the small-diameter hydraulic fracturing test system, due to the large diameter of drill pipes, high-pressure rubber hoses and other equipment used in conventional hydraulic fracturing in-situ stress tests, it is impossible to use the original technical approach to install high-pressure liquid and test equipment in the reserved location

Method used

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  • Bridge connection type packer for testing crack caused by hydraulic pressure of minor-diameter rock
  • Bridge connection type packer for testing crack caused by hydraulic pressure of minor-diameter rock
  • Bridge connection type packer for testing crack caused by hydraulic pressure of minor-diameter rock

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Such as Figure 3-7 As shown, a bridge-type packer for small-diameter rock mass hydraulic fracturing test of the present invention includes a double-circuit installation rod connector 1, an upper packer 2, a connector 4 with a water spray hole 3, It consists of a lower packer 7 and a lower plug 8; the double-circuit installation rod connector 1, the upper packer 2, the connector 4 with the water spray hole 3, the lower packer 7 and the lower plug 8 are tightly closed in sequence connected.

[0029] In the small-diameter rock mass hydraulic fracturing test bridge packer, the material of the double-circuit installation rod connector 1 is 304 stainless steel, and there are threads at both ends, which are respectively connected to the double-circuit installation rod and the upper packer. The packer inlet hole 5 of the connection head 1 of the circu...

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Abstract

The invention discloses a bridge connection type packer for testing crack caused by a hydraulic pressure of a minor-diameter rock. The bridge connection type packer comprises a double-loop installation rod joint, an upper packer, a connector with a spiracle, a lower packer and a lower plug which are connected tightly in order. The bridge connection type packer has the advantages that an in-situ test measuring scheme for the crack caused by the hydraulic pressure in a minor-diameter boring can be realized, the bridge connection type packer has specifications of phi30mm and phi39mm, the structure is simple, assembling is convenient, and the parts including the double-loop installation rod joint, the upper packer, the connector with the spiracle, the lower packer and the lower plug can be used to seal a test segment and spray high pressure liquid during measurement for the crack caused by the hydraulic pressure in the minor-diameter boring.

Description

technical field [0001] The invention relates to a small-diameter rock mass testing tool, in particular to a bridge-type packer for small-diameter rock mass hydraulic fracturing testing. Background technique [0002] Hubbert and Willis proposed in 1957 that the fractures produced by wellbore fluid fracturing are closely related to the stress state existing in the rock mass, and pointed out that the rock mass pressure is not in the state of hydrostatic pressure. Kehle (1964) made a simple analysis of the stress distribution around the wellbore in the experimental section isolated by the packer for the first time, and pointed out that the effect of the packer formed a shear stress zone around the hole wall. Fairhurst (1964) was the first scientist to propose the use of hydraulic fracturing technology to measure in-situ stress, and pointed out many advantages of hydraulic fracturing technology. Haimson and Fairhurst (1967) pointed out that the fractures on the borehole wall are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/122E21B43/26
CPCE21B33/122E21B43/26
Inventor 王成虎刘一民高桂云黄禄渊王显军
Owner NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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