致密油藏复杂交叉Y型裂缝网络水平井产能及压力分析  

Productivity and pressure response of complex Y-shape hydraulic fracture networks in tight oil reservoirs

作　　者：杨立敏[1] 田树宝[2] 白兴[1] 田冷[2] 汪洋[1] 

机构地区：[1]中国石油大学(北京)理学院,北京102249 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《断块油气田》2017年第5期682-686,共5页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目"基于声震效应的页岩储层多组分流体多场耦合流动机理"(U1562102)

摘　　要：针对水平井体积压裂产生的复杂交叉Y型裂缝网络,考虑裂缝交会处流量的重新分配,研究了致密油藏复杂交叉Y型裂缝网络压裂水平井的压力响应及产能变化规律,分析了裂缝形态(平行和交叉)、裂缝间距、裂缝闭合失效和井筒储集系数等因素的影响。结果表明:压开的裂缝网络越复杂,裂缝间距越小,无量纲井筒储集系数越小,则裂缝线性流出现得越晚,双线性流越明显且持续时间越长;压后闭合失效的裂缝位置和数量对水平井的动态产量和压力也有影响。通过比较、分析压后水平井的动态产量及压力响应曲线,对压后裂缝的有效性作出评价,为后期的压裂设计和施工提供指导。Considering the redistribution of oil flow in the intersection of fracture in the complex fracture network, the productivity and pressure response of hydraulic fracturing horizontal well with complex Y-shape hydraulic fracture networks was studied. The effects of factors such as fracture shape （parallel and cross）, fracture interval, ineffective fracture and wellbore storage coefficient were analyzed. The results show that the more complex the fracture networks, the less the fracture interval, the smaller the wellbore storage coefficient result in the later the fracture liner flow, the more obvious the bilinear flow and the longer the bilinear flow. The location and amount of the ineffective fractures also have influences on the productivity and pressure of the horizontal well. By the observation, comparison and analysis of the productivity and pressure response curves of the horizontal well, the effectiveness of the constructed fractures can be evaluated, which can help to design and construct hydraulic fracturing in tight oil reservoirs.

关 键 词：致密油藏 复杂裂缝网络 水平井 多段压裂 星￣三角变换法 产能分析 有效裂缝 

分 类 号：TE331[石油与天然气工程—油气田开发工程]