压裂参数对煤储层水力压裂裂缝的影响  

Influences of Hydrofracturing Factors on Coal Reservoir Fractures

作　　者：王晓锋 解慧 扈金刚 唐书恒[2] 朱卫平[3] 

机构地区：[1]山西蓝焰煤层气集团有限责任公司,山西晋城048026 [2]中国地质大学,北京100083 [3]中油吐哈油田分公司,新疆哈密839000

出　　处：《特种油气藏》2013年第6期129-132,148,共4页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金项目"地质因素耦合作用下煤储层水力压裂裂缝发育模型"(40972108);国家科技重大专项"高产水煤储层特性动态变化预测技术"(2011ZX05034-03)

摘　　要：以沁水盆地南部为研究对象,以流体连续性方程和裂缝内的压降方程为依据,以有限元软件ANSYS为平台,模拟了注入压力和压裂液黏度等压裂施工参数对煤储层水力压裂起裂压力和裂缝扩展的影响。模拟发现,裂缝起裂瞬间,射孔尖端受到的张应力等于煤岩的抗拉强度,且随着远离裂尖而逐渐减小;最大缝长和最大缝宽都随着注入压力的增大而近似线性增大;随着压裂液黏度的增大,最大缝长逐渐减小,最大缝宽逐渐增大,裂缝的起裂压力不变化。Based on the finite element software ANSYS,the fluid continuity equation and fracture drawdown equation are used to simulate how the factors such as injection pressure and viscosity of fracturing fluid influence the initiation pressure and propagation of hydraulic fractures in the coal reservoir in the south of Qinshui Basin. The results show that the tensile stress at the perforation tip equals to the tensile strength of the coal at the moment of fracture initiation and decreases with the distance away from the fracture tip. Both the maximum fracture length and maximum fracture width increase linearly with rising of the injection pressure. When the viscosity of fracturing fluid increases,the maximum fracture length decreases,the maximum fracture width increases,while the initiation pressure keeps unchanged.

关 键 词：煤层气 水力压裂 注入压力 黏度 数值模拟 沁水盆地 

分 类 号：TE375[石油与天然气工程—油气田开发工程]