页岩储层水力压裂裂缝相互作用分析研究

Analysis of interaction between hydraulic fractures in shale reservoirs

水平井分段压裂是对页岩进行储层改造和增产的一项工艺技术,在进行体积压裂过程中,裂缝尖端产生应力集中,并且人工裂缝之间也会因为应力干扰而产生相互作用,对于延长陆相页岩储层,结合线弹性断裂力学理论,运用有限元方法对裂缝之间的相互作用进行了研究,结果表明:裂缝扩展以张开型为主,裂缝之间存在应力干扰作用,进行单井压裂时,裂缝会相互排斥,随着间距的增加,排斥作用降低,为页岩储层压裂改造提供参考和依据。

Horizon well stage fracturing is the one technology for stimulating shale reservoir.There is a area of stress concentration in the fracture tip,so that the interaction between fractures will be generated.For Yanchang shale gas reservoirs,combine the theory of elastic fracture mechanics and FEM to investigate the interaction between hydraulic fractures.The result shows that the main of fractures are opened.Due to the stress interference between fractures in single well fracturing, fractures would propagate from each other,the repulsive interaction decrease as fractures space increase.It provides references for stimulating shale reservoir in the future.