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Engineering mechanical parameter related brittleness index prediction method

A technique of brittleness index, prediction method, applied in the direction of testing the strength of materials, measuring devices, scientific instruments, etc. using applied stable tension/compression

Inactive Publication Date: 2017-02-08
DAGANG OIL FIELD OF CNPC
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Problems solved by technology

[0003] In order to solve the problem of determining the brittleness index in the fracturing evaluation process of tight oil and gas reservoirs, the purpose of the present invention is to provide a brittleness index prediction method related to engineering mechanics and convenient and quick calculation

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Embodiment 1

[0063] The fragility index prediction method of the present embodiment, it comprises the following steps:

[0064] 1. Core sampling design and sampling;

[0065] The samples were sampled in accordance with the sampling requirements of XRD whole-rock X-ray diffraction analysis and engineering mechanics test to ensure that the samples were consistent in depth.

[0066] 2. Mineral composition test of core samples;

[0067] According to the XRD diffraction test analysis of the samples, the rock mineral composition in the tight rock formation is diverse, and the main components are quartz, calcite, analcite, clay, dolomite, feldspar, pyrite and so on. Its mineral composition test data are shown in Table 1:

[0068] Table 1 XRD analysis of mineral content

[0069] Sample serial number Depth (m) layers quartz Calcite Analcite clay dolomite Feldspar pyrite 1 2939.53 Ek 2 1

13 2 48 18 2 15 2 2 2953.31 Ek 2 1

16 3 27 13...

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Abstract

Belonging to the technical field of petroleum and natural gas exploration, the invention relates to an engineering mechanical parameter related brittleness index prediction method. The method includes the steps of: 1) core sampling design and sampling; 2) core sample mineral component testing; 3) testing of core sample Young's modulus and Poisson's ratio; 4) establishment of a mathematical model between rock mineral components and engineering mechanical parameters, and determining the relationship between the mineral components and the rock mechanical parameters; 5) calculation of the engineering mechanical parameters of all samples; and 6) calculation of the rock brittleness index. The method acquires the relationship between the rock mechanical parameters and mineral components and the relationship between the mineral content and the rock brittleness index through mathematical models. The method has the advantages of short test period, simple sampling operation and cost saving, can guide the fracturability evaluation of the rock stratum more efficiently, and provides technical support for oil and gas exploration and development.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, more specifically, the invention relates to a method for predicting brittleness index related to engineering mechanics parameters. Background technique [0002] In the process of tight oil development, rock brittleness is an important parameter in the evaluation process of fracturing. The engineering mechanical parameters representing rock brittleness are mainly Young's modulus and Poisson's ratio. Since the test of formation Young's modulus and Poisson's ratio must rely on core data and are expensive, generally less data are obtained. In early studies, the brittleness index of rock samples was often calculated using the content of main brittle minerals (quartz) or the content of brittle mineral combinations (quartz feldspar, dolomite, calcite, etc.). On the one hand, because there is no necessary correlation between the content of minerals and mineral combinations and engineerin...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0087
Inventor 周立宏蒲秀刚陈长伟肖敦清杨飞韩国猛马建英
Owner DAGANG OIL FIELD OF CNPC
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