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Method for measuring differential stress by using rock core

A technology of rock core and stress, which is applied in the field of measuring differential stress by using rock core to achieve the effect of reducing error and calculating accurately

Inactive Publication Date: 2019-04-16
INST OF GEOMECHANICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of method that utilizes rock core to measure differential stress, to solve the technical problem existing in the prior art

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  • Method for measuring differential stress by using rock core
  • Method for measuring differential stress by using rock core
  • Method for measuring differential stress by using rock core

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Embodiment Construction

[0034] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...

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Abstract

The invention relates to the technical field of ground stress measurement, in particular to a method for measuring the differential stress by using a rock core. The method for measuring the differential stress by using the rock core comprises the steps that radial deformation of the rock core is measured first, development and distribution characteristics of micro-cracks in the rock core are evaluated, the accumulated width of the micro-cracks at different radial directions is counted and determined, and finally, the Shmax-Shmin true measured value is obtained. By measuring the widths of the micro-cracks of the rock core, when the radial deformation of the rock core is calculated, the widths of the micro-cracks are added, so that the calculation of the radial deformation of the rock core is more accurate, errors are reduced, it is ensured that the final data can be normally used under various conditions, and then the elastic deformation measurement of the rock core can be widely used.

Description

technical field [0001] The invention relates to the technical field of geostress measurement, in particular to a method for measuring differential stress by rock core. Background technique [0002] In-situ stress is the initial stress existing in the crustal rock mass, and it is also one of the important physical property parameters of the solid earth. In-situ stress is the root force that causes deformation, instability and destruction of rock mass, and it is also an important reference for the exploitation of deep energy such as oil, shale gas, and hot dry rock. For the development of shale gas and hot dry rock reservoirs, the magnitude of differential stress is an important basic parameter for the construction of fracture system and the expansion of fracture network. [0003] At present, in-situ stress measurement mainly relies on drilling and coring. For example, the core anelastic recovery method (ASR method) is a method based on the inelastic deformation of the core a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06E21B47/00G06Q50/02
Inventor 张重远陈群策秦向辉陶涛李全
Owner INST OF GEOMECHANICS
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