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Leak-off computation of hydraulic fracturing in coal-bed methane under considering stress sensitivity

LI Ting1,YANG Qi1,NIU Jian-bing2,YANG Bo1,FENG Wen-guang1 1.College of Energy Resources,Chengdu University of Technology,Chengdu 610059,China; 2.Down-hole Service Company,CNPC Bohai Drilling Engineering Company Limited,Tianjin 300457,China  
Because of the influencing factors,such as the existing of natural fractures,the stress sensitivity,the softness and frailty of the coal formation,the leak-off volume is great in the hydraulic fracturing of coal-bed methane and the usual Carter's calculating leak-off method has not been applicable.From the view that the pressure difference between fracture and formation affects severely the permeability and porosity of the coal formation,this paper provides a new mathematical model and the related calculation methods.Finally,one field case example is illustrated and compared with the Carter's method.It is concluded that the new method is more applicable for the field situations.
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