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Method for shale-gas-well storing-layer brittleness comprehensive evaluation

A comprehensive evaluation and shale gas well technology, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, measuring devices, etc., can solve problems such as inability to apply on-site engineering parameter design, and achieve good practicability and adaptability strong effect

Active Publication Date: 2016-12-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] (1) Analysis is mainly based on indoor test data, which cannot be applied to on-site engineering parameter design
[0008] (2) There are great limitations in analyzing the brittleness of shale rocks at different depths and in geomechanical environments

Method used

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  • Method for shale-gas-well storing-layer brittleness comprehensive evaluation

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with accompanying drawing.

[0037] This embodiment provides a method for comprehensive evaluation of shale gas well reservoir brittleness, including the following steps:

[0038] (1) Use the shale rock sample to be tested for triaxial compression test to obtain the full stress-strain curve, where, according to figure 1 The connection diagram of the experimental device shown is to connect the experimental pipeline and the data transmission line, wherein the device is the core part of the experiment; after connecting the pipelines 2, 3 and the data line 8, install the experimental specimen 6 (shale rock sample to be tested), The installation of the experimental specimen 6 mainly includes the installation of the radial strain sensor, the axial strain sensor, and the upper and lower indenters, wherein the upper and lower indenters are equipped with a receiver 5, which is connected to the pipeline inside t...

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Abstract

The invention discloses a method for shale-gas-well storing-layer brittleness comprehensive evaluation. The method includes the following steps that to-be-measured shale samples are subjected a triaxial compression testing experiment, and a complete stress-strain curve is obtained; a brittleness drop coefficient R, a stress depreciation coefficient P and a softening modulus M are calculated, the brittleness indexes corresponding to the brittleness drop coefficient R, the stress depreciation coefficient P and the softening module M are subjected to normalization processing respectively, and a comprehensive brittleness index Bd is obtained; correction is carried out according to a Bd calculation model, the corrected brittleness index Bd<3> serves as an objective function, parameters such as a shale dynamic elastic modulus E in well logging data serve as independent variables, function regression is carried out, a multi-regression function Y of the Bd<3> is obtained and substituted into different-layer-section storing-layer well logging parameters, and the comprehensive brittleness indexes of different well-section storing layers are obtained. According to the method, the whole condition of shale damaging is considered, and the brittleness characteristics of shale can be comprehensively responded; meanwhile, the brittleness of different-depth, different-confining-pressure and different-well-section storing layers is analyzed by combining shale-gas-well logging information, and the adaptability is high.

Description

technical field [0001] The invention relates to the technical field of evaluation of unconventional oil and gas reservoirs, in particular to a method for comprehensive evaluation of shale gas well reservoir brittleness. Background technique [0002] Shale gas reservoirs are widely distributed in China, with recoverable reserves of 36.08×10 12 m 3 , ranking first in the world, but shale itself has the characteristics of low porosity and low permeability, and generally requires large-scale fracturing to obtain commercial production. Studies have found that the brittleness of shale can significantly affect the stability of wellbore walls and fracturing effects. It is a key indicator for evaluating the mechanical properties of reservoirs, and an important basis for selecting perforation stimulation intervals and designing fracturing scales, so it is of great significance to the study of shale brittleness. [0003] Brittleness is a key parameter reflecting the compressibility o...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01V9/00
CPCG01N3/12G01N2203/0048G01N2203/0075G01V9/00
Inventor 肖佳林李远照吴雷泽李奎东陈希茜王小军黄进张辉刘炜刘龙
Owner CHINA PETROLEUM & CHEM CORP
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