Method and device for measuring shale rock mechanical properties

Abstract

The invention discloses a method and device for measuring shale rock mechanical properties and belongs to the field of petroleum and gas. The method comprises carrying out preset mode loading on all three shale core samples of each type of shale core samples belonging to three types to obtain compressive strength, transverse strain curves, axial strain curves and volumetric strain curves of the three shale core samples, wherein the three types of the shale core samples are obtained through shale sampling along three directions comprising a longitudinal direction, a transverse direction and an inclined direction forming an included angle of 60 degrees with the horizontal direction, calculating elasticity moduli of all the shale core samples of three types of the shale core samples according to the volumetric strain curves of the shale core samples, and calculating a Poisson's ratio according to the transverse strain curve, the axial strain curve and the volumetric strain curve. According to shale specificity, through use of multi-directional sampling and a plurality of loading modes, accurate data is acquired. The method and device are suitable for shale cores.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to a method and device for measuring mechanical properties of shale rocks. Background technique [0002] Rock mechanical properties refer to the ability of rocks to resist deformation and damage under stress. It includes deformation properties and strength properties. The physical quantities that characterize deformation properties mainly include elastic modulus and Poisson’s ratio. The physical quantities that characterize strength properties are mainly compressive strength. Therefore, the compressive strength, elastic modulus and Poisson's ratio of shale can be measured to characterize the rock mechanical properties of shale. [0003] In addition, in the field of oil and gas, the rock mechanical properties of shale are the key factors affecting the exploitation of shale gas. At present, there is no uniform standard for the experimental methods of rock mechanical properti...

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Problems solved by technology

At present, there is no uniform standard for the experimental methods of rock mechanical properties of shale, and the experimental methods of rock mechanical properties of conventional oil and gas reservoirs are mainly used for reference.

The experimental methods of rock mechanical properties of conventional oil and gas reservoirs are general, and have not taken into account the particularity of shale, such as shale cores are dense, bedding planes are developed, micro-fractures are locally developed, and brittle. Therefore, conventional oil and gas reservoirs The experimental methods for the rock mechanical properties of layers are not necessarily applicable to shale cores, therefore, the experimental data made may be inaccurate and lack credibility

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