Method for determining macroscopic modulus of shale through fine/micro mechanical test

A micromechanics and shale technology, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, and testing material hardness, etc., can solve the problems that the continuum theory cannot accurately express the mechanical properties of multiphase media, and achieve reduction The effect of test cost and shortened test cycle

Pending Publication Date: 2021-06-25
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0006] The present invention is a method for determining the macroscopic modulus of shale through micro/micro mechanical testing, which is used to solve the limitations of conventional mechanical testing

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  • Method for determining macroscopic modulus of shale through fine/micro mechanical test
  • Method for determining macroscopic modulus of shale through fine/micro mechanical test
  • Method for determining macroscopic modulus of shale through fine/micro mechanical test

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Embodiment Construction

[0042] Such as Figure 1-Figure 5 As shown, a method of determining the macroscopic modulus of shale by micro / micromechanical testing of the present invention comprises the following steps:

[0043] (1) Drill standard rock sample a and sample b in two directions parallel to the bedding and perpendicular to the bedding respectively, measure and record the diameter and height of sample a and sample b collected;

[0044] (2) Perform uniaxial compression tests on sample a and sample b to obtain Young's modulus and Poisson's ratio on the macro scale;

[0045] (3) Cut the sample a and sample b after the uniaxial compression test into four 20mm×10mm×5mm slices, these four slices are respectively, a V , b V 、a P and b P , where a V and b V The slice direction is parallel to the bedding, a P and b P The slice direction is perpendicular to the bedding;

[0046] (4) taking the residual sample after cutting sample a and sample b in step (3) and performing X-ray diffraction to obt...

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Abstract

A method for determining the macroscopic modulus of shale through a fine/micro mechanical test comprises the following steps: obtaining a macroscopic test result through a uniaxial compression test, and sequentially carrying out nanoindentation test and atomic force microscope test on a rock slice to obtain the Young modulus of a sample under the microscopic scale and the microscopic scale, and carrying out coupling analysis on the obtained data and carrying out macro-scale upgrading. Herein, results of the nanoindentation and the atomic force microscope are first analyzed to determine the fine/microscale modulus of the shale; and then, based on MLA result, the mineral compositions is classified according to modulus difference, and t mechanihecal parameters under a microscopic scale and a microscopic scale are updated by adopting a Mori-Tanaka homogenization method so as to determine the macroscopic modulus of the shale. The method can be used for rapidly predicting the mechanical parameters such as the elastic modulus and the hardness of the material, the rock debris can be used for performing MLA, AFM and nanoindentation tests in the drilling process to obtain macroscopic mechanical parameters, the test cost is reduced, and the test period is greatly shortened.

Description

technical field [0001] The invention belongs to the field of rock mechanics, is a method for determining the macroscopic modulus of shale through micro / micro mechanical tests, is an improvement on the traditional shale mechanics analysis method, and is especially suitable for rapidly predicting the mechanical properties of shale. Background technique [0002] Shale gas and oil are key commodities in the current energy market as new technologies emerge. In the process of oil and gas exploration and development, the mechanical properties such as elastic modulus and anisotropy of rock have an important influence on the interpretation of seismic data and the establishment of geological models. In addition, during the drilling process, the mechanical properties of shale are greatly affected by wellbore instability and slow drilling speed. Therefore, it is necessary to accurately determine rock modulus, hardness and strength parameters to clarify complex wellbore conditions and p...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/08G01N3/42G01N23/207G01N23/203
CPCG01N3/00G01N3/08G01N3/42G01N23/207G01N23/203
Inventor 李勇马啸天陈建奇杨江浩
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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