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A kind of artificial coal core, its preparation method and its application

A coal core, artificial technology, applied in the field of artificial coal core, its preparation, to achieve high-efficiency development, uniform distribution of cracks, and good results

Active Publication Date: 2017-10-17
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the artificial core cemented by ordinary quartz sand and epoxy resin can basically only reflect the characteristics of pores, without the characteristics of cracks.

Method used

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  • A kind of artificial coal core, its preparation method and its application
  • A kind of artificial coal core, its preparation method and its application
  • A kind of artificial coal core, its preparation method and its application

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Experimental program
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Embodiment Construction

[0024] The principles and features of the present invention are described below, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0025] 1. Determination of particle size of artificial coal core skeleton coal.

[0026] The coal particle size is moderate, the experimental seepage effect is good, and it is more in line with the real coal permeability. The instrument used in the laboratory core flow test is the JHGP gas permeability meter, and the liquid permeability is measured according to Darcy's law.

[0027] Darcy's formula is:

[0028] In the formula, K─absolute permeability of rock sample, μm 2 or d(darcy);

[0029] A─cross-sectional area of ​​the rock sample, cm 2 ;

[0030] L—the length of the rock sample, cm;

[0031] μ─Viscosity of liquid passing through the rock sample, mPa·s;

[0032] ΔP─The pressure difference between the two ends of the rock sample, 0.1MPa;

[0033] ...

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Abstract

The invention belongs to the technical field of coalbed methane exploration and development, and in particular relates to an artificial coal core, its preparation method and its application. In terms of weight percentage, it includes: 85%-90% of coal particles, 5%-10% of sodium bentonite, and 5%-10% of water. The composition of the artificial coal core provided by the invention is closer to the natural core, and the effect is better when the core flow test is carried out. The materials are mainly coal particles, sodium bentonite and water, and the proportion is moderate, which conforms to the composition of real coal rocks, and then maintains some properties such as matrix pores and interfacial tension of coal particles in the original coal rocks. During the test, the fluid directly contacts coal and sodium bentonite , compared with the existing quartz sand epoxy resin cemented artificial core, it is more realistic.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane exploration and development, and in particular relates to an artificial coal core, its preparation method and its application. Background technique [0002] In the field of coalbed methane exploration and development technology, a series of evaluation tests will be carried out to evaluate coal reservoirs and coalbed methane reserves, as well as the degree of damage to the reservoir by drilling fluid, completion fluid and fracturing fluid during drilling. In the experiment, in order to be able to simulate the distribution of fractures in real coal seams so as to develop coalbed methane efficiently, it is necessary to rely on artificial coal cores. However, the artificial core cemented by ordinary quartz sand and epoxy resin can basically only reflect the characteristics of pores, without the characteristics of cracks. Contents of the invention [0003] In order to solve the deficiencies ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B32/00G01N1/28
Inventor 吕帅锋乌效鸣王道宽张晓飞粟冬梅
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)