致密油藏多角度裂缝压裂水平井产能计算方法  

A computational method for productivity of arbitrary angular fractured horizontal well in tight oil reservoirs

作　　者：方思冬 战剑飞[2] 黄世军[1] 何聪鸽 

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2015年第3期84-89,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金"特低渗油藏天然缝与人工缝耦合作用的渗流机理与模型"(51174215/E0403)

摘　　要：水平井分段压裂是致密油藏开发的关键技术。由于受复杂的地应力和天然裂缝的影响,人工裂缝通常与井筒呈一定角度,导致压裂水平井产能预测变得十分复杂。基于天然裂缝等效渗透率张量理论,建立考虑全渗透率张量的各向异性稳定渗流数学模型。在该模型的基础上,结合势叠加原理,采用考虑应力敏感的半解析方法,构建基质向人工裂缝流动的离散势函数单元。将裂缝内流体流动处理为离散单元之间的线性流动,将基质与裂缝流动耦合求解,得到考虑天然裂缝下多角度裂缝压裂水平井产能计算方法。实例计算结果表明,由于考虑了天然裂缝和人工裂缝角度的影响,计算结果与实际产量误差小于7%。敏感性分析发现,储层主渗透率方向与人工裂缝的夹角对产能影响较大。Multi-staged fracturing for the horizontal well is the key technique of tight oil reservoir development. Due to the complexity of the in-situ stress and the impact of natural fractures,there is usually a certain angle between the hydraulic fractures and the wellbore,which makes the production forecast of the fractured horizontal well very difficult. Based on the equivalent permeability tensor theory in naturally fractured reservoir,a steady flow mathematical model has been established in the tight oil reservoir with full permeability tensor. By combining the half-analytical method that considering stress sensitivity with potential superposition principle,a discrete potential function unit of the flow from matrix to artificial fractures was formed. The flow in the fractures is considered as linear flow among the discrete units,and the matrix and fracture flow are coupled and solved. A computational method for productivity of arbitrary angular fractured horizontal well under the condition of the natural fractures was given. The result of a practical case shows that the error between the computing results and the field data is less than 7% for considering the effect of the angle of the natural and artificial fractures.Sensitivity analysis indicates that the angle between the primary permeability and the hydraulic fracture has a significant impact on the horizontal well productivity.

关 键 词：致密油藏 全渗透率张量 压裂水平井 应力敏感 产能 

分 类 号：TE313.8[石油与天然气工程—油气田开发工程]