Method and system for acquiring three-dimensional ground stress by using rock core

A technology of in-situ stress and core, applied in the field of method and its acquisition system, to achieve the effect of improving efficiency and accurate three-dimensional in-situ stress parameters

Active Publication Date: 2019-07-12
INST OF GEOMECHANICS
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for obtaining three-dimensional geostress using rock cores ...

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  • Method and system for acquiring three-dimensional ground stress by using rock core
  • Method and system for acquiring three-dimensional ground stress by using rock core
  • Method and system for acquiring three-dimensional ground stress by using rock core

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[0028] 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.

[0029] According to the classical theory of elastic mechanics, for an isotropic cylindrical core drilled by a vertical borehole, the in-situ stress on the core in its original position is immediately relieved. The initial diameter of the cylindrical core after breaking away from the crustal stress field and before recovering from elastic deformation is d 0 , and the cylindrical section is a true circle at this time. It is assumed that the drilled core is intact and free from micro-cracks and inelastic strain ...

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Abstract

The invention relates to the technical field of ground stress measurement, in particular to a method and a system for acquiring three-dimensional ground stress by using a rock core. The method for acquiring the three-dimensional ground stress comprises the following steps: S1, determining numerical values of known parameters and a reasonable value range of unknown parameters; S2, generating satisfied test data; S3, performing inversion analysis on the test data; S4, matching input parameter values in a reasonable value range of the unknown parameters; and S5, performing inversion analysis according to the input parameter values to obtain the three-dimensional ground stress. The three-dimensional ground stress acquisition system comprises an artificial neural network model module, an inversion analysis model module, an evolution calculation module and a controller. The controller is respectively connected with the artificial neural network model module, the inversion analysis model module and the evolution calculation module. According to the invention, inversion and evolutionary calculation are carried out on the generated test data, and reasonable matching of output parameters iscarried out, so that the estimated three-dimensional ground stress parameters are accurate, and the efficiency of obtaining the three-dimensional ground stress is improved.

Description

technical field [0001] The invention relates to the technical field of geostress measurement, in particular to a method for obtaining three-dimensional geostress by using rock cores and an acquisition system thereof. 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 is also an important parameter that affects the exploitation of deep energy such as oil, shale gas, and hot dry rock. [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 after it leaves the rock mass stress environment, and then estimates A common method for three-dimensional principal stresses. However, this method has com...

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Application Information

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IPC IPC(8): G01L5/00G01V9/00G01N33/24
CPCG01L5/00G01N33/24G01V9/00
Inventor 张重远王锡勇杨洪磊陶涛曹学农张士安李国岐
Owner INST OF GEOMECHANICS
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