期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 26, 期 -, 页码 857-866出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2015.07.021
关键词
Compressive strength; Hydraulic slotting; Flaw parameters; RSM; Fractal dimension
资金
- State Key Basic Research Program of China [2011CB201205]
- National Natural Science Foundation of China [51474211, 51204174, 51404261]
- National Science and Technology Support Program [2012BAK04B07]
- Natural Science Foundation of Jiangsu Province [BK20140196]
- Fundamental Research Funds for the central university [2014QNA02]
- China Postdoctoral Science Foundation [2014M551057]
Hydraulic slotting is an effective method for enhanced coalbed methane (ECBM) recovery, and it has been widely employed in China. Although there have been many studies of this technique, the influence of slot parameters on the strength characteristic of the coal, which is an important factor that affects the permeability enhancement effect, has rarely been studied. Thus, only limited information is available regarding the pressure relief and permeability enhancement mechanisms of this technique. In the current study, the influence of flaw parameters on the compressive strength of a precracked sample under biaxial compression is discussed. The results indicate that an increase in the flaw length and width has a negative effect on the compressive strength, whereas an increase in the flaw inclination angle has a positive effect on the compressive strength. The results of the response surface methodology (RSM) indicate that the interactions among the flaw parameters have a significant influence on the compressive strength. The propagation patterns of cracks are quantified by the fractal dimension, which is used to explore the mechanism of compressive strength variation with changes in the flaw parameters. The study results indicate that the variation in the flaw parameters changes the propagation pattern of cracks, resulting in different compressive strengths. In addition, an opposite variation trend of the compressive strength and fractal dimension with flaw parameters is also observed. The research results are expected to guide the field application of hydraulic slotting. (C) 2015 Elsevier B.V. All rights reserved.
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