A coal seam hydraulic fracturing simulation experiment method

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 the problems of difficult to identify small hydraulic fractures, difficult to distinguish between natural fractures and hydraulic fractures, etc.

Inactive Publication Date: 2011-12-14
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.

Method used

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  • A coal seam hydraulic fracturing simulation experiment method
  • A coal seam hydraulic fracturing simulation experiment method
  • A coal seam hydraulic fracturing simulation experiment method

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Embodiment Construction

[0020] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and the description thereof are used to explain the present invention, but not as a limitation to the present invention.

[0021] In order to perform hydraulic fracturing simulation experiments on coal seams, and to observe the shape and geometric size of hydraulic fractures more effectively in the experiments, and overcome the shortcomings of the prior art in distinguishing hydraulic fractures from natural fractures and displaying micro-cracks, the present invention provides a coal seam Hydraulic fracturing test methods, such as figure 1 As shown, the method includes the following steps:

[0022] Step S101: Analyze the natural fracture morphology characteristics of the ...

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Abstract

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 coalbed methane hydraulic fracturing production-increasing technology, in particular to a coalbed 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 increasing the production of coalbed methane. Therefore, in order to study the mechanism of CBM hydraulic fracturing stimulation, laboratory simulation experiments are needed. [0003] The rock properties of coal rock and oil field oil and gas reservoirs are significantly different. Coal rock has a large number of bedding, cleat structural characteristics and brittle and soft physical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
Inventor 张广清陈勉范铁刚
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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