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Comprehensive brittleness evaluation method of gas storage cap rock

An evaluation method and a comprehensive evaluation technology, applied in the field of comprehensive brittleness evaluation of gas storage caprock rocks, can solve the problems of poor applicability, single evaluation method, lack of theoretical basis, etc., and achieve high evaluation reliability and low experimental cost , the effect of solving limitations

Active Publication Date: 2020-04-07
YANGTZE UNIVERSITY
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Problems solved by technology

Existing evaluation methods are mostly carried out from the perspectives of hardness or solidity, strength, mineral composition, and stress-strain curves, etc., and there are problems such as high test cost, difficult implementation, poor applicability, lack of theoretical basis, lack of verification of theoretical basis, and excessive evaluation methods. Single and other limitations

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  • Comprehensive brittleness evaluation method of gas storage cap rock
  • Comprehensive brittleness evaluation method of gas storage cap rock
  • Comprehensive brittleness evaluation method of gas storage cap rock

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 As shown, the comprehensive brittleness evaluation method of gas storage cap rock includes the following steps:

[0033] 1) Drilling and sampling the cap rock of the gas storage to be evaluated, and grinding and processing the collected rock samples into three types of rock samples, that is, intact rock samples P m , Incomplete rock sample I r and damaged rock samples D n ;

[0034] 2) Take the intact rock sample P in step 1) m Perform triaxial compression tests to obtain intact rock samples P m Then, use the brittleness evaluation method based on the stress-strain curve to evaluate the brittleness of the rock sample;

[0035] 3) get the incomplete rock sample 1 in step 1) r Hardness testing to obtain incomplete rock samples I r Then, use the hardness-based brittleness evaluation method to evaluate the brittlenes...

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Abstract

The invention discloses a comprehensive brittleness evaluation method of supracrustal rocks of gas storage, and belongs to the technical field of rock brittleness evaluation. Firstly, the brittleness of a collected rock sample is evaluated on the basis of brittleness evaluation methods respectively based on a stress-strain curve, hardness and mineral composition; then the weighted value of the three brittleness evaluation methods is calculated by means of a weight back analysis method based on optimization theory; finally, comprehensive evaluation on the brittleness of the supracrustal rocks of gas storage is carried out. The method effectively solves a problem of limitation of single brittleness evaluation method in the prior art and has excellent practicability and high evaluation reliability. The collected rock sample has multiple applications, so that test cost is low.

Description

technical field [0001] The invention relates to the technical field of rock brittleness evaluation, in particular to a method for comprehensive brittleness evaluation of gas storage cap rock. Background technique [0002] Underground gas storage plays a role in protecting national energy security, maintaining social stability, alleviating peak oil and gas resource allocation pressure, and regulating market oil and gas prices in the aspects of national strategic investment, emergency response, coordination of seasonal peak and trough periods of gas consumption, and optimization of gas supply systems. Countries around the world are vigorously promoting the construction of gas storage facilities. [0003] Rock brittleness refers to the property that rocks will fail when undergoing small deformation. The brittleness evaluation of the cap rock of the gas storage is of great significance to the study of the mechanical properties of the cap rock, the determination of the maximum a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/40G01N23/20
CPCG01N3/08G01N3/40G01N23/20
Inventor 贾善坡舒克通杜国锋雷鸣邓福成
Owner YANGTZE UNIVERSITY
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