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System and method for shale in-situ volume fracturing tests

A technology of volume fracturing and test system, which is applied in the application of stable tension/pressure to test the strength of materials and the use of sonic emission technology for material analysis, etc. effect of development

Inactive Publication Date: 2014-11-05
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a shale in-situ volume fracturing test system and method to solve the problem that the existing test system and method for studying shale in-situ volume fracturing cannot simulate the stress state and fracture of the shale layer in the real mining process pattern problem

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  • System and method for shale in-situ volume fracturing tests
  • System and method for shale in-situ volume fracturing tests
  • System and method for shale in-situ volume fracturing tests

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[0032] The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0033] see Figure 1-4 , the shale in-situ volume fracturing test system includes a cube-shaped shale test piece 250 with a central hole 160, a triaxial loading system for applying pressure to the shale test piece 250, and a triaxial loading system for applying pressure to the shale test piece 250. A volume fracturing system for injecting fracturing fluid and a data monitoring and acquisition system for acquiring sound and load of a shale specimen 250 during fracturing. The triaxial loading system includes 9 hydraulic jacks 120 that press the shale specimen 250 axially and 4 flexible hydraulic bladders 170 that press the shale specimen 250 laterally. Both the hydraulic jacks 120 and the flexible hydraulic bladder 170 are externally connected. There is a hydraulic source 220 . The volume fracturing system includes a liquid in...

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Abstract

The invention provides a system and a method for shale in-situ volume fracturing tests, and belongs to the technical field of shale gas exploitation. The system comprises a cubic shale test piece with a center hole, a three-shaft loading system used to apply stress to the shale test piece, a volume fracturing system used to inject a fracturing fluid into the shale test piece, and a data monitoring acquisition system for acquiring sound and load during fracturing of the shale test piece. The shale in-situ volume fracturing test system employs a real shale body as a test target, and the three-shaft loading system with a flexible hydraulic bag is added on the basis of a conventional system, so that the stress suffered by a shale layer can be truly simulated during exploitation of shale gas, and thus technical data related to shale fracturing is conveniently and relatively accurately obtained by people, and the problems are effectively solved that a conventional test system and a method for researching shale in-situ volume fracturing cannot simulate the stress state and the fracturing mode of the shale layer during a real exploitation process.

Description

technical field [0001] The invention relates to the technical field of shale gas exploitation, in particular, to a system and method for an in-situ volume fracturing test of shale. Background technique [0002] Shale gas is an unconventional natural gas resource extracted from shale layers and is a very important clean energy source. At present, the commonly used technology for shale gas exploitation in the world is volume fracturing technology. However, the existing experimental systems and methods for studying shale in-situ volume fracturing basically use a physical model mixed with cement, fine sand, and glass flakes as the pressure specimen, which cannot simulate the shale formation in the real mining process. Stress states and rupture modes. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a shale in-situ volume fracturing test system and method, so as to solve the problem that the existing test system and method for studying shal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/10G01N29/14
Inventor 刘大安王洪建李晓
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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