特低渗透油藏压裂水平井新型布井方式研究

Novel Well Pattern for Fractured Horizontal Well in Ultra-low Permeability Reservoir

考虑长庆油田特低渗油藏地貌特征和储层各向异性,提出了一种压裂水平井新型布井方式。从钻井和油藏两个角度论证新型布井的可行性。丛式井技术可确保压裂水平井新型布井的顺利实施。利用油藏数值模拟方法,分别从单井产能、阶段采出程度、含水率、波及面积等方面评价了压裂水平井新型布井在交错、菱形和矩形井网中的开发效果研究表明,新型布井与常规布井在交错井网中具有相同的开发效果;菱形和矩形井网中,新型布井可以提高阶段采出程度、单井产能和相对波及面积,降低相同采出程度对应的含水率。新型布井在菱形井网(矩形井网)30 a的相对波及面积和采出程度分别提高6.00%(10.00%)和0.96%(1.60%),含水率95%的采出程度提高1.05%(1.50%)。

A novel well pattern was presented for fractured horizontal wells in ultra-low permeability reservoir, considering geomorphological features and permeability anisotropy of Changqing Oilfield. The feasibility of novel well pattern was demonstrated on drilling and development. The cluster well technology can guarantee the successful drilling and completionon of the fractured horizontal wells. Development of novel well pattern in the interlacing well pattern, rectangular pattern and rhombic inverted nine-spot pattern was evaluated by reservoir numerical simulation about average well production, oil recovery, water cut and sweep area. The results show that novel well pattern and conventional well pattern has the same development effectency in the interlacing well pattern; the novel well pattern in the other two patterns can effectively reduce the water cut in the sweep area of 30 years and the degree of reserve recovery enhance 6.00% and 10.00%, recovery 0.96% and 1.6%. respectively, and the final recovery 1.05% and 1.50% （when water cut =95%）.