川南阳新统压裂酸化裂缝扩展模型研究

54 Research on Expansion Model of Fracturing Fracture in Yang Xin Series of South Sichuan

川南二叠系阳新统属海相碳酸盐岩裂缝储层，压裂缝主要受最小水平主应力和自然裂缝网络结构控制。建立了以井轴为中心、主要沿自然裂缝网络延伸、整体外形近似为椭球状的扩展模型；建立了裂缝网络的结构参数、地层压力和用液量与延伸扩展最大距离的近似数学关系；

Yangxin series in south sichuan belongs to marine facies,carbonate fr-actured reservour,fracturing fracture is mainly controled by minimum horizontal stress and natural fracturte metwork.On this basis,a fracture expansion model ce-ntered by borehole axis,expanding along natural fracture network,and looking like a ellipsoid is built ,In addition,the approximate mathematical relation be-tween structure parameter of fracture network,formation pressure,fluid volume and the maximum fracture expansion distance is derived.to improve the success ratio of fracture acidizing ,the key point is to increase the expansion distanceof side fracture,