Study on influence of in-situ stress difference in sandy gravel reservoir fracturing
In the process of hydraulic fracturing,the horizontal in-situ stress difference has the most significant influence on the fracture propagation trend,in addition,because the sand and gravel reservoir contains gravel,the interaction between the crack and the gravel will have an impact on the hydraulic fracturing construction.So this paper uses the Tyson polygon to characterize the random distribution of gravel,and uses the global insertion finite element method to establish a numerical model to analyze the fracture propagation of sand and gravel reservoir.The results show that the fracture extends along the direction of the maximum horizontal principal stress,and the extension distance also shows an increasing trend.Near the injection of fracturing fluid in the well,the hydraulic fracturing will produce the phenomenon of gravel penetration,which will consume more energy than the gravel.The gravel has an adsorption effect on the hydraulic fracturing.
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万方数据
维普
