Shale brittleness index evaluation method, device and system

A technology of brittleness index and evaluation method, applied in the field of rock mechanics, can solve the problems that it is difficult to fully reflect the brittleness characteristics of shale, and the brittleness characteristics are single

Active Publication Date: 2020-03-27
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, provide a shale brittleness index evaluation method, device and system, and solve the problem that the brittleness characteristics of shale in the mineral composition or rock mechanics in the prior art are relatively single, and the existing shale brittleness The technical problem that the index is difficult to fully reflect the brittle characteristics of shale

Method used

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  • Shale brittleness index evaluation method, device and system
  • Shale brittleness index evaluation method, device and system
  • Shale brittleness index evaluation method, device and system

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Embodiment 1

[0021] Such as figure 1 As shown, Embodiment 1 of the present invention provides a shale brittleness index evaluation method, comprising the following steps:

[0022] S1. Acquire stress-strain curves of rock samples under different confining pressures, and calculate pre-peak energy evolution eigenvalues ​​and post-peak energy evolution eigenvalues ​​according to the stress-strain curves;

[0023] S2. Calculate the pre-peak brittleness index according to the pre-peak energy evolution characteristic value, and calculate the post-peak brittleness index according to the post-peak energy evolution characteristic value;

[0024] S3. Combining the pre-peak brittleness index and the post-peak brittleness index to obtain a comprehensive brittleness index, and evaluate shale brittleness according to the comprehensive brittleness index.

[0025] The present invention proposes a shale brittleness index based on energy evolution. On the basis of previous studies, the characteristics or la...

Embodiment 2

[0088] Such as figure 2 As shown, Embodiment 2 of the present invention provides a shale brittleness index evaluation device 1, including a processor 11 and a memory 12, and a computer program is stored on the memory 12, and when the computer program is executed by the processor 11, Realize the shale brittleness index evaluation method provided by the above examples.

[0089] The shale brittleness index evaluation device 1 provided in the embodiment of the present invention is used to realize the shale brittleness index evaluation method, therefore, the technical effects possessed by the shale brittleness index evaluation method are also possessed by the shale brittleness index evaluation device 1, which will not be described here. Let me repeat.

[0090] Specifically, the shale brittleness index evaluation device 1 in this embodiment is implemented by a computer.

Embodiment 3

[0092] Such as image 3 As shown, Embodiment 3 of the present invention provides a shale brittleness index evaluation system, including the shale brittleness index evaluation device 1 provided in the above embodiment, and also includes a detection system for detecting the stress-strain curve of shale under different confining pressures. device;

[0093] The detection device includes a control cabinet 2, a loading press 4, a triaxial chamber 7, a heat-shrinkable plastic tube 8, an axial stress sheet 10, and a transverse stress sheet 11; the control cabinet 2 includes an oil pump and an oil chamber, and the oil pump And the loading press 4 is electrically connected with the shale brittleness index evaluation device 1 respectively, the oil chamber is filled with hydraulic oil 3, the oil chamber communicates with the triaxial chamber 7 through the oil pump, and the The loading press 4 includes an upper ram 5 and a lower ram 6, the lower ram 6 is fixed in the triaxial chamber 7, t...

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Abstract

The invention relates to the technical field of rock mass mechanics, and discloses a shale brittleness index evaluation method, device and system. The method comprises the following steps: obtaining stress-strain curves of a rock sample under different confining pressures, and calculating a pre-peak energy evolution characteristic value and a post-peak energy evolution characteristic value according to the stress-strain curves; calculating a pre-peak brittleness index according to the pre-peak energy evolution characteristic value, and calculating a post-peak brittleness index according to thepost-peak energy evolution characteristic value; and obtaining a comprehensive brittleness index by combining the pre-peak brittleness index and the post-peak brittleness index, and evaluating the shale brittleness according to the comprehensive brittleness index. According to the comprehensive brittleness index provided by the invention, the whole process of shale deformation and failure under different confining pressures is comprehensively considered, and brittleness characteristics of different rocks under different confining pressure conditions can be well reflected.

Description

technical field [0001] The invention relates to the technical field of rock mechanics, in particular to a shale brittleness index evaluation method, device and system. Background technique [0002] Brittleness is the property of rock mass to fail under very small plastic deformation, and at the same time, it is accompanied by a sharp release of elastic energy during the failure process. As an important basic characteristic of rock mass, brittleness evaluation is of great significance to rock mass engineering practice. For example, in oil and gas field exploitation engineering, rock mass brittleness is a key indicator of reservoir evaluation, which is closely related to wellbore stability, initiation and extension of hydraulic fractures. It is closely related to the effective communication of the final fracture network; in deep rock mass engineering, the brittleness of rock mass is an important internal factor of engineering disasters such as rockburst and rock burst; in exca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019G01N2203/0252G01N2203/0256G01N2203/0075G01N2203/0676
Inventor 温韬贾文君李德成孙莉霞高德祥王凤华唐睿旋胡明毅
Owner YANGTZE UNIVERSITY
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