摘要
水力射孔辅助定向压裂可有效提高低渗透油田压裂效率,明显改善压裂效果。建立了包含地层水泥环套管的水力射孔井的三维力学模型,运用有限元数值模拟方法结合弹性力学理论和岩石的破裂机理,分析了水力射孔参数对地层破裂压力的影响。研究结果表明,沿着最大水平地应力方向进行交错布孔、选择射孔密度为4 m-1、增加射孔深度可以有效降低地层破裂压力。研究结果可为水力射孔辅助定向压裂工艺提供参数优选的依据。
The efficiency of hydraulic fracturing treatment in reservoirs with low permeability can be improved by oriented fracturing assisted with hydraulic perforating. The 3D finite element mechanical model of wellbore with hydraulic perforating including formation, cement sheath and casing was established. The effects of hydraulic perforatiing parameters on the fracturing pressure were studied in detail by fine dement method（FEM） combined with theory of elasticity mechanics and broken mechanism of rock. The results show that the fracturing pressure can be effectively decreased when hydraulic perforating are staggered in the direction of maximum horizontal in-situ stress, selecting shot density of 4 holes per meter and increasing hydraulic perforating depth. The conclusion provides the parameter criterion for oriented fracturing assisted by hydrojetting.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第5期42-45,共4页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家高技术研究发展计划项目(2005AA615020)
国家杰出青年科学基金项目(50125413)
关键词
水力射孔
破裂压力
射孔参数
力学模型
有限元法
hydraulic perforating
fracturing pressure
perforating parameter
mechanical model
fine element method
