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Multi-field coupled low permeability coal seam hydraulic fracturing simulation test method

A technology of hydraulic fracturing and simulation test, applied in the field of hydraulic fracturing, can solve problems such as research methods proposed for hydraulic fracturing of low-permeability coal seams without multi-field coupling

Inactive Publication Date: 2015-12-23
河南能源化工集团研究总院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no research method for hydraulic fracturing of multi-field coupled low-permeability coal seams.

Method used

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  • Multi-field coupled low permeability coal seam hydraulic fracturing simulation test method
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  • Multi-field coupled low permeability coal seam hydraulic fracturing simulation test method

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Effect test

Embodiment 1

[0026] Such as figure 1 Shown, the present invention comprises the following steps::

[0027] Step 1. Preliminary preparation

[0028] 1a) Mix the prepared coal powder evenly according to a certain particle size ratio, and add a certain binder;

[0029] 1b) During the forming process of the coal rock formation in the test piece box, the sensor and the outer pipe are installed at the same time; the structure of the test piece box and the outer pipe is the same as the structure of the test piece box disclosed in the invention patent with the application number "201310025093.9". I won't go into details here. The outer diameter of the outer tube is 33mm;

[0030] 1c) Seal the test piece box, and connect the sensor wiring to the computer;

[0031] 1d) Place the test piece box in the loading system, then assemble the inner pipe in the outer pipe, and use the inner pipe's drainage area as the fracturing area; the structure of the inner pipe is the same as that in the invention pa...

Embodiment 2

[0045] Such as figure 1 As shown, in the coal seam forming process of step one, the coal seam is simulated with pressed briquettes, the roof is simulated with cement or gypsum pouring and other similar materials, and the outer pipe is pre-embedded and installed in the roof; and in the same group of steps five During the test, the normal distance between the outer pipe and the coal seam was changed. Other steps in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

[0046] Table 2: Virtual reservoir hydraulic fracturing simulation test scheme

[0047]

[0048] For low-permeability and soft coal seams, the appropriate distance for roof fracturing of low-permeability and soft coal seams is studied by changing the normal distance between the fracturing holes and the coal seam by carrying out multiple test programs shown in Table 2.

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Abstract

The invention discloses a multi-field coupled low permeability coal seam hydraulic fracturing simulation test method, which comprises the steps of: previous preparation, stress loading, hydraulic fracturing, ending of first test, and other tests of the same group. Accordingly, low permeability coal seam hydraulic fracturing under field conditions can be simulated in a laboratory to make coal seam parameter change under actual working conditions reappear, study the change of a hydraulic fracturing stress field, fracture field, seepage field and temperature field, analyze the relation between hydraulic fracturing and fracturing area location, fracturing section length, and analyze the hydraulic fracturing fracture channel and coal seam gas flow coupled space-time evolution law. Also, for low permeability soft coal seams, in a test piece molding process the coal seam adopts pressed molded coal for simulation, the top plate employs cement, gypsum or other materials for simulation, an outer tube is buried in the top plate in advance, and by changing the normal distance between the outer tube and the coal seam, a proper distance for low permeability soft coal seam roof fracturing can be researched.

Description

technical field [0001] The invention relates to a multi-field coupled low-permeability coal seam hydraulic fracturing simulation test method, which is mainly used for simulating and studying the hydraulic fracturing of low-permeability coal seams in a laboratory. Background technique [0002] At present, coal seams contain a large amount of coalbed methane, also known as gas, which is not only a valuable resource, but also an important part of the outburst potential of coal and gas in underground coal mining. my country is a country with abundant coal resources. With the rapid development of the coal industry and the sudden increase in scale, the amount of gas gushing out has increased, and the number of coal mine accidents caused by gas outbursts and explosions has risen rapidly. At the same time, coalbed methane is a high-quality and clean fuel. If it is properly developed, recycled and utilized, it can not only reduce the occurrence of coal mine accidents, ensure the norm...

Claims

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Application Information

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IPC IPC(8): G01N33/24
Inventor 马耕彭守建陶云奇尹光志刘晓许江刘东唐勖培王维忠冯丹武雪锋张超林
Owner 河南能源化工集团研究总院有限公司
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