Simulation experiment method of coal seam hydraulic fracture
A technology for hydraulic fracturing and simulation experiments, which is applied in the direction of applying stable tension/pressure to test the strength of materials, which can solve problems such as difficulty in identifying tiny hydraulic fractures, and difficulty in distinguishing natural fractures from hydraulic fractures.
Inactive Publication Date: 2013-04-24
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
However, for rocks with a high degree of natural fractures such as coal and rock, sometimes it is difficult to identify small hydraulic fractures by light dyes, and it is difficult to distinguish natural fractures from hydraulic fractures.
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[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0021] In order to conduct hydraulic fracturing simulation experiments on coal seams, observe the shape and geometric dimensions of hydraulic fractures more effectively in the experiments, and overcome the deficiencies of the prior art in distinguishing hydraulic fractures from natural fractures and displaying tiny cracks, the present invention provides a coal seam Hydraulic fracturing experimental methods, such as figure 1 As shown, the method includes the following steps:
[0022] Step S101: Analyze the morphological characteristics of natural fractures in the coal...
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The invention provides a simulation experiment method of coal seam hydraulic fracture, comprising the following steps of: (a) analyzing natural fracture shape characteristics of a coal rock in a stratum to be simulated, selecting a coal rock material for making a simulation specimen, processing the coal rock material into a hexahedral block according to the natural fracture shape characteristics,and selecting a coating layer carrying out external casting on the block to form the simulation specimen; (b) selecting fluorescent powder as a tracer, and then preparing fracturing fluid; and (c) performing a simulation fracturing experiment with the simulation specimen and the fracturing fluid and acquiring image information of a hydraulic fracture shape and a fracturing fluid swept region after the experiment. In terms of brittle and fragile coal rock with difficulty in processing, after the coating layer is cast by the method disclosed by the invention, the specimen has whole smooth and regular appearance, and the stratification and cutting positions of the coal rock can be well controlled. When the experiment result is acquired, the range of the hydraulic fracture can be clearly displayed by the fluorescent powder, and in particular the micro-fracture that cannot be viewed by the naked eyes can be displayed.
Description
technical field [0001] The invention relates to a coal bed gas hydraulic fracturing stimulation technology, in particular to a coal seam hydraulic fracturing simulation experiment method. Background technique [0002] Large-scale true triaxial hydraulic fracturing experiment is a method to study hydraulic fracturing technology in the laboratory. At present, with the rise of coalbed methane resource development, people have conducted extensive research on coalbed methane mining and production increase. Practice has proved that hydraulic fracturing technology is a technology suitable for coalbed methane production stimulation. Therefore, in order to study the stimulation mechanism of coalbed methane hydraulic fracturing, it is necessary to carry out laboratory simulation experiments. [0003] There are significant differences in the properties of coal rocks and oil and gas reservoir rocks in oil fields. Coal rocks have a large number of bedding and cleat structural character...
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IPC IPC(8): G01N3/12
Inventor 张广清陈勉范铁刚
Owner CHINA UNIV OF PETROLEUM (BEIJING)