摘要
水平井和水力压裂是页岩气开发中的关键技术。对水力压裂中多簇裂缝同时扩展的物理过程进行了数值模拟。采用扩展有限元法(XFEM)模拟岩石中裂缝沿着任意路径扩展,采用有限体积法(FVM)模拟裂缝中流体的流动,并且考虑井筒中流体流动以及在各簇裂缝间的流量动态分配。通过牛顿迭代对全耦合物理过程进行数值求解,重点研究了初始长度不同的两条裂缝的扩展过程,证明较大的射孔摩阻能促进两条裂缝的同时扩展。并通过算例证明了本方法的精度和有效性。
Hydraulic fracturing in the horizontal wellbore is an effective technique in the development of shale gas. In this paper, the growth of multiple hydraulic fractures clusters is simulated numerically. The extended finite element method （XFEM） is adopted to model arbitrary propagation of the fractures in shale rock and the finite volume method （FVM） is used to discretize fluid flow in the fractures. The flow in horizontal wellbore and the dynamic distribution of the flow into different fracture clusters are consi- dered. The fully coupled field equations are solved by Newton iteration. Numerical examples are presented to validate the accuracy and efficiency of the method. The propagation paths of two hydraulic fractures are modeled to demonstrate that the larger perforation entry friction can promote simultaneous growth of multiple fracture clusters.
出处
《计算力学学报》
CAS
CSCD
北大核心
2016年第4期643-648,共6页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金(11532008
11372157)
教育部博士点专项研究基金(20120002110075)资助项目
关键词
水力压裂
裂缝簇
扩展有限元
有限体积法
全耦合模拟
hydraulic fractures
multiple fracture clusters
extended finite element method
finite volume method
fully coupled model
