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Deep hole difference stress evaluation method based on secondary sleeve core

A technology of sleeve core and stress, applied in the direction of force/torque/work measuring instruments, measuring devices, instruments, etc., can solve the problems of evaluation method error, unusability, and failure to eliminate micro-crack interference factors, so as to avoid errors and differences Stress for true and accurate effects

Active Publication Date: 2020-11-24
INST OF GEOMECHANICS
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  • Abstract
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Problems solved by technology

However, the general cylindrical core diameter deformation measurement method does not take into account the part of interference factors such as micro-cracks, so the evaluation method also has a large error, and even cannot be used.

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  • Deep hole difference stress evaluation method based on secondary sleeve core
  • Deep hole difference stress evaluation method based on secondary sleeve core
  • Deep hole difference stress evaluation method based on secondary sleeve core

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Embodiment Construction

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0034] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...

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Abstract

The invention relates to the technical field of ground stress measurement, in particular to a deep hole difference stress evaluation method based on a secondary sleeve core. The evaluation method comprises the following steps of: taking out a large rock core with a large diameter from a drill hole, and carrying out a radial deformation test on the large rock core; sleeving the large rock core to take a small rock core, and performing radial deformation test on the small rock core; wherein the difference value of the horizontal principal stress is that the diameter of the large rock core is larger than that of the small rock core. According to the method, the accumulated width of the stress-induced micro-cracks in the large rock core can be obtained and eliminated, so that the difference stress measured based on the elastic deformation of the rock core can be more real and accurate.

Description

technical field [0001] The invention relates to the technical field of geostress measurement, in particular to a deep hole differential stress evaluation method based on a secondary sleeve 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 inelasti...

Claims

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Application Information

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IPC IPC(8): G01L5/00
CPCG01L5/00
Inventor 张重远秦向辉陈群策孟文李彬
Owner INST OF GEOMECHANICS
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