Experimental test method for subcritical propagation rate of rock fractures based on triaxial stress - strain curve

a triaxial stress strain curve and experimental test method technology, applied in the field of rock mechanics research, can solve the problems of restricting the study of subcritical fracture propagation under high effective stress, and achieve the effect of simplifying experimental data acquisition and more accurate results

Active Publication Date: 2021-04-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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Benefits of technology

[0052](3) The present invention innovatively deduces the calculation formula of the subcritical fracture propagation rate of the co...

Problems solved by technology

However, most materials such as rocks actually fracture in environmental medium, and the environmental medium has a very significant impact on fracture process.
However, their limitations are also obvious: (1) The sample preparation process of the two test methods is complicated and requires artificial fracture prefabrication, but c...

Method used

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  • Experimental test method for subcritical propagation rate of rock fractures based on triaxial stress - strain curve
  • Experimental test method for subcritical propagation rate of rock fractures based on triaxial stress - strain curve
  • Experimental test method for subcritical propagation rate of rock fractures based on triaxial stress - strain curve

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embodiment

[0095]Cores was selected and taken from deep shale formation in a block in Sichuan Basin to conduct experiments based on the detailed implementation of the above steps. The specific process is described as follows.

[0096]Step 1: Select and take cores from deep shale formation in a block in Sichuan Basin, drill and prepare test cores L-1 and L-2 (Table 1) according to the rock sample preparation method stated in SYT5358-2010; the cores had no visible fractures and were dried at 60° C. to constant weight.

[0097]Step 2: Put the dried core into the GCTS triaxial rock mechanics test system, apply constant confining pressure (radial stress) of 30 MPa to the core, and apply axial stress in the axial direction after the confining pressure is stable; in order to satisfy the quasi-static loading requirement in test, the axial loading rate is only 0.005 mm / s; record the experimental parameters such as axial stress, strain and corresponding loading time of the core throughout the loading test unt...

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Abstract

The invention discloses an experimental test method for subcritical propagation rate of rock fractures based on triaxial stress-strain curve, including: Step 1: preparing test sample core for experiment; Step 2: putting core into triaxial rock mechanics test system, applying constant radial confining pressure to core, and applying axial stress in the axial direction until the core is macroscopically damaged; recording experimental parameters of axial stress, strain and corresponding loading time of the core; Step 3: drawing stress-strain curve of the test core according to detection data points of axial stress and axial strain; Step 4: in the stress-strain curve of the test core, starting time and ending time of the subcritical propagation stage of fractures inside the core correspond to the initiation stress σci and damage stress σcd, respectively, and calculating subcritical propagation rate of the subcritical fracture propagation stage of the test core.

Description

BACKGROUND OF THE INVENTIONTechnical Field[0001]The present invention relates to the technical field of rock mechanics research, in particular to the field of subcritical propagation mechanics of rock fracture, more specifically relating to an experimental test method for subcritical propagation rate of rock fractures based on triaxial stress-strain curve.Description of Prior Art[0002]To deepen the understanding of the forming mechanism of formation fractures, research on rock mechanics can effectively improve fracturing efficiency and increase oil and gas production. At present, the mainstream method is to use Griffith fracture theory, which believes that the equilibrium fracture condition of ideal brittle solid is determined by the surface energy of the solid in vacuum. However, most materials such as rocks actually fracture in environmental medium, and the environmental medium has a very significant impact on fracture process. The most obvious manifestation is that under the acti...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N33/24E21B49/02
CPCG01N3/08G01N33/24G01N2203/023G01N2203/0067G01N2203/0075E21B49/02G01N2203/0003G01N2203/0019G01N2203/0066G01N2203/0256G01N2203/0266G01N2203/0676G01N2203/0682G01N2203/0688G01N2203/0298
Inventor ZHANG, HAOYANG, BINZHONG, YINGYANG, YANGSHE, JIPINGPAN, GUANCHANGCHANG, KUNWANG, XINYANG
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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