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Fracture characterization method for hydraulic fracturing simulation experiments

A simulation experiment and hydraulic fracturing technology, applied in the direction of applying stable tension/pressure to test the strength of materials, instruments, measuring devices, etc., can solve the problem that the crack shape cannot be displayed intuitively in three dimensions, and achieve the effect of convenient storage

Active Publication Date: 2019-02-15
PETROCHINA CO LTD
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  • Claims
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Problems solved by technology

[0005] The present invention provides a crack characterization method for hydraulic fracturing simulation experiments to solve the problem that cracks can only be recorded by simple photographing means and cannot be visually displayed in three dimensions

Method used

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  • Fracture characterization method for hydraulic fracturing simulation experiments
  • Fracture characterization method for hydraulic fracturing simulation experiments
  • Fracture characterization method for hydraulic fracturing simulation experiments

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Embodiment Construction

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.

[0035] The present invention proposes a fracture characterization method for hydraulic fracturing simulation experiments, such as figure 1 As shown, the fracture characterization method for the hydraulic fracturing simulation experiment comprises the following steps:

[0036] Step A (for example, step S101): processing and making a rock sample; select a rock sample 1 to be simulated (the rock sample can be sandstone, shale and coal rock, etc.), and cut the rock sample into a standard for the experiment The size is 762mm*762mm*914mm, and then the drilling shaft 2 is cemented; the surface of the rock sample is cut and the acoustic emission sensor is arranged;

[0037] Step B (for example, step S102): then load the three-way confining pressure on the rock sample, for ex...

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Abstract

The invention provides a fracture characterization method for a hydraulic fracturing simulation experiment. The fracture characterization method comprises the following steps that 1, a rock sample is manufactured; 2, three-way confining pressure is loaded to the rock sample, a fracturing simulation experiment is performed on the rock sample by adopting a fracturing fluid with a tracer, and after cracking, a rock sample with fractures is obtained; 3, after the fracturing simulation experiment, the rock sample with the fractures is extracted, three dimensional scanning is performed on the fracture surface affected by the fracturing fluid after the hydraulic fracturing simulation experiment through a three-dimensional laser scanner, and collected information is obtained, wherein the information comprises point cloud data containing position information and color photo information; 4, triangular meshing treatment is conducted on a scanned point cloud through a converse method, and three-dimensional fractures with real surface texture and true color are rebuilt. According to the fracture characterization method, accurate characterization on the true-color fracture forms of rocks with different forms and colors can be achieved.

Description

technical field [0001] The present invention relates to the technical field of hydraulic fracturing for oil field development, in particular to a method for analyzing the fracture form in a physical simulation experiment of hydraulic fracturing, which is used to study the mechanism of crack initiation and expansion, that is, a method for characterization of fractures used in hydraulic fracturing simulation experiments . Background technique [0002] With the large-scale development of unconventional oil and gas reservoirs such as tight oil and gas, coalbed methane and shale gas, hydraulic fracturing technology has become particularly important. The field of hydraulic fracturing urgently needs the support of basic research, and it is necessary to understand the law of fracture propagation and the shape of complex fractures, so as to guide reservoir stimulation to realize beneficial development. The large-scale full three-dimensional hydraulic fracturing physical simulation e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12G01N3/06
CPCG01N3/068G01N3/12G01N2203/0048G01N2203/0062G01N2203/0066G01N2203/0652
Inventor 梁天成丁云宏付海峰刘云志修乃岭严玉忠窦晶晶卢拥军郑伟
Owner PETROCHINA CO LTD
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