Numerical Modeling of Stress Shadow Effect on Hydraulic Fracturing
Received date: 2015-02-07
Revised date: 2015-03-27
Online published: 2015-10-10
From the aspect of meso-structure heterogeneity of gas shale,the seepage- stress-damage coupling code was used to investigate the stress shadow effect during hydraulic fracturing.The experimental results show that: (1)The stress shadow effect is affected by horizontal differential stress,injection spacing,heterogeneity and fracturing sequence.It displays repel and attract mechanical behaviors,which influences the stress-umbrella area,fracture length and width.(2)With the decrease of rock heterogeneity,the stress shadow effect has weaker influence on the stress-umbrella area,area becomes smaller gradually.(3)When the horizontal differential stress is smaller,influence of injection spacing on stress shadow competes over the far-field stress;with higher horizontal differential stress,influence of far-field stress on stress shadow competes injection spacing.(4)The stress shadow effect displays dynamic variation with the evolution of hydraulic fractures.There is strong correlation between stress umbrella area and fracture length,and they obeyed power function.Through this research,it can provide certain theatrical basis for horizontal well spacing and multiple perforation spacing optimization.
WANG Yu，LI Xiao，WANG Jin-bo，ZHENG Bo，ZHANG Bo，ZHAO Zhi-heng . Numerical Modeling of Stress Shadow Effect on Hydraulic Fracturing[J]. Natural Gas Geoscience, 2015 , 26(10) : 1941 -1950 . DOI: 10.11764/j.issn.1672-1926.2015.10.1941
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