The brittleness indices used in rock mechanics and their application in shale hydraulic fracturing: A review

被引:318
作者
Zhang, Decheng [1 ]
Ranjith, P. G. [1 ]
Perera, M. S. A. [1 ]
机构
[1] Monash Univ, Dept Civil Engn, Deep Earth Energy Lab, Bldg 60, Melbourne, Vic 3800, Australia
关键词
Shale gas recovery; Hydraulic fracking; Brittleness index; Field application; DUCTILE TRANSITION; STRENGTH; WATER; PREDICTION; FAILURE; BEHAVIOR; POROSITY; LEAKAGE;
D O I
10.1016/j.petrol.2016.02.011
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Brittleness is commonly used to characterize the possible failure features in rocks, quantified by the brittleness index (BI(26)BIs, the applicability of each BI should be well understood to enable the selection of the most suitable for each application. This study reports on a detailed review of existing BI definitions in the rock mechanics field, the transition from brittle to ductile and the application of BIs to shale fracturing. The success of shale gas recovery using hydraulic fracking is greatly dependent on the shale's brittleness, since brittle shales have many pre-existing fractures and are easy to fracture in tensile and shear modes. A combination of laboratory and geophysical approaches are recommended for shale brittleness quantification. Precise quantification of brittleness is important, both in the laboratory and the field. Brittleness indices based on the elastic moduli (Young's modulus and Poisson's ratio) and mineral composition are common in field applications, and can be derived from both laboratory tests and field log data. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:158 / 170
页数:13
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