Method and device for measuring shale rock mechanical properties

A technology of rock mechanics and shale, applied in the field of oil and gas, which can solve the problems of lack of reliability, unification, and inaccurate experimental data.

Active Publication Date: 2016-06-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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...

Method used

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  • Method and device for measuring shale rock mechanical properties
  • Method and device for measuring shale rock mechanical properties
  • Method and device for measuring shale rock mechanical properties

Examples

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Effect test

Embodiment 1

[0056] figure 1 It is a flow chart of a method for measuring the mechanical properties of shale rock provided by the embodiment of the present invention. see figure 1 , the method includes:

[0057] Step 101: For each of the three core samples, each core sample includes three core samples, perform predetermined mode loading on the three core samples, and obtain the compressive strength and transverse strain curves of the three core samples , axial strain curve and volumetric strain curve, the predetermined mode includes uniaxial strain loading, triaxial stress loading or triaxial confining pressure / axial pressure loading and unloading cycle, so that one core sample corresponds to one predetermined mode, and the three core samples are for the The shale is sampled in three directions, and the three directions are longitudinal, transverse and oblique with an angle of 60 degrees to the horizontal direction.

[0058] Step 102: For each of the three core samples, calculate the el...

Embodiment 2

[0081] figure 2 It is a flow chart of a method for measuring the mechanical properties of shale rock provided by the embodiment of the present invention. see figure 2 , the method includes:

[0082] Step 201: For each of the three core samples, each of which includes three core samples, load the three core samples in a predetermined mode to obtain the compressive strength and transverse strain curves of the three core samples , axial strain curve and volumetric strain curve, the predetermined mode includes uniaxial strain loading, triaxial stress loading or triaxial confining pressure / axial pressure loading and unloading cycle, so that one core sample corresponds to a predetermined mode, and the three core samples are The shale is sampled in three directions, the three directions are longitudinal, transverse and oblique respectively.

[0083] In the embodiment of the present invention, considering the development of shale bedding planes, the development of micro-fractures...

Embodiment 3

[0118] image 3 It is a schematic structural diagram of a device for measuring the mechanical properties of shale rock provided by the embodiment of the present invention. see image 3 , the device includes: a loading module 301 , a first calculation module 302 and a second calculation module 303 .

[0119] The loading module 301 is used for, for each of the three rock core samples, each rock core sample includes three rock core samples, and the three rock core samples are loaded in a predetermined mode to obtain the compressive strength and transverse strain of the three rock core samples curve, axial strain curve and volumetric strain curve, the predetermined mode includes uniaxial strain loading, triaxial stress loading or triaxial confining pressure / axial pressure loading and unloading cycle, so that one core sample corresponds to one predetermined mode, and the three core samples are The shale is sampled in three directions, the three directions are the vertical directi...

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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...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/02G01N1/28
Inventor 佘朝毅付永强桑宇杨建李金穗曾立新
Owner PETROCHINA CO LTD
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