Petroleum Science >2013,??Issue 2:??219-225 DOI: https://doi.org/10.1007/s12182-013-0270-9
Hydraulic fracture initiation theory for a horizontal well in a coal seam Open?Access
文章信息
作者：Hou Bing,Chen Mian,Wang Zheng,Yuan Jianbo and Liu Ming
作者單位：
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;Security Department, Tuha Oil Company, Shanshan, Xinjiang 838202, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
投稿時間：2012-08-22
引用方式：Hou, B., Chen, M., Wang, Z. et al. Pet. Sci. (2013) 10: 219. https://doi.org/10.1007/s12182-013-0270-9
文章摘要
A series of experiments were performed to determine rock mechanical parameters related to hydraulic fracturing of coal. The effect of confining pressure and pore pressure on the strength of coal was studied. Experimental results show that the coal seam in the study areas has a relatively low elastic modulus, high Poisson’s ratio, high fragility and is easily broken and compressed. The coal seam is
considered as a transversely isotropic medium, since the physical properties in the direction of bedding plane and orthogonal to the bedding plane vary markedly. Based on the generalized plane strain model, stress distribution for an arbitrarily orientated wellbore in the coal seam was determined. In a horizontal well, hydraulic fracturing was found to initiate in the coal seam mass due to tensile failure, or from cleats due to shear or tensile failure. For those coal seams with abundant natural cleats, hydraulic fracture initiation can be induced by any of these mechanisms. In this study, hydraulic fracture initiation criteria for a horizontal well in a coal seam were established.
considered as a transversely isotropic medium, since the physical properties in the direction of bedding plane and orthogonal to the bedding plane vary markedly. Based on the generalized plane strain model, stress distribution for an arbitrarily orientated wellbore in the coal seam was determined. In a horizontal well, hydraulic fracturing was found to initiate in the coal seam mass due to tensile failure, or from cleats due to shear or tensile failure. For those coal seams with abundant natural cleats, hydraulic fracture initiation can be induced by any of these mechanisms. In this study, hydraulic fracture initiation criteria for a horizontal well in a coal seam were established.
關鍵詞
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Hydraulic fracturing, coal seam, transversely isotropic, fracture initiation, cleat, natural fracture