Tight reservoir compressibility evaluation method for determining fractured rock crack areas

A technique for tight reservoir and evaluation method, applied in the field of tight reservoir fracturing, can solve problems such as the inability to truly reflect the compressibility of reservoir rocks, and achieve the effect of simple, easy and universal applicability of the method.

Active Publication Date: 2019-01-18
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0008] The object of the present invention is to provide a tight reservoir compressibility evaluation method for determining the area of ​​cracked rock fractures, whic

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  • Tight reservoir compressibility evaluation method for determining fractured rock crack areas
  • Tight reservoir compressibility evaluation method for determining fractured rock crack areas
  • Tight reservoir compressibility evaluation method for determining fractured rock crack areas

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Embodiment Construction

[0030] The present invention is described further below:

[0031] This tight reservoir compressibility evaluation method for determining the area of ​​fractured rock fractures includes the following steps:

[0032] Step 1. Select a block of rock to prepare a dense rock sample of φ25mm×50mm. The two ends of the dense rock sample are required to be parallel to each other. The error of the height of the test piece shall not be greater than 0.3mm, the end face of the tight rock sample shall be perpendicular to the axis of the tight rock sample, and the maximum deviation of the end face of the tight rock sample shall not be greater than 0.25°.

[0033] Step 2: Use a triaxial compression testing machine to perform a triaxial compression test on the compact rock sample, first increase the confining pressure to a predetermined value σ at a constant rate 3 , and then axially loaded until failure, to obtain the axial stress-strain curve and the corresponding radial strain.

[0034] St...

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Abstract

The invention relates to a tight reservoir compressibility evaluation method for determining fractured rock crack areas. The method comprises the steps of 1, selecting a rock of certain block and preparing a tight rock sample; 2, carrying out a triaxial compression test on the tight rock sample through utilization of a triaxial compression tester; 3, computing surface energy consumed when the tight rock sample is fractured according to an axial stress-strain curve of the triaxial compression test; 4, preparing a disk-shaped rock sample, carrying out a Brazilian split test on the disk-shaped rock sample, recording load when the disk-shaped rock sample is fractured, and computing tensile strength of the rock sample; 5, computing specific surface energy of the disk-shaped rock sample; 6, computing a crack area after the tight rock sample is fractured in the triaxial compression test; and 7, selecting a plurality of tight rock samples at different positions of the block, repeating the steps 1-6, and carrying out compressibility evaluation on the tight rock samples at the different positions. According to the method, the crack area formed at the interior after the rock is fractured is taken as a compressibility evaluation index, so physical connotation of compressibility can be reflected scientifically.

Description

technical field [0001] The invention relates to the fracturing technology of tight reservoirs, in particular to a method for evaluating the compressibility of tight reservoirs for determining the fracture area of ​​fractured rocks. Background technique [0002] Tight reservoirs have the characteristics of low porosity and low permeability. In order to maximize the development benefits, it is necessary to evaluate the compressibility of the reservoir rocks, and select well sections with good compressibility and easy formation of fracture network for fracturing. Thereby improving fracturing effect and single well productivity. Compressibility refers to the difficulty of formation of complex fracture networks in reservoirs, and is a parameter used to measure the difficulty of effective reservoir stimulation. The good fracability of the reservoir indicates that the complex fracture network is easy to form after hydraulic fracturing, and the fracturing effect is good; the poor f...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0087G01N2203/0256
Inventor 冯福平黄芮艾池胡超洋丛子渊段永伟
Owner NORTHEAST GASOLINEEUM UNIV
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