超低渗透致密油藏水平井井网优化技术研究

鄂尔多斯盆地具有丰富的超低渗透油藏资源，开发潜力巨大，但由于其储层物性差、非均质性强等特点，直
井大幅度提高单井产量难度较大。针对超低渗致密储层特点，以建立有效驱替压力系统为目标，利用矿场实践、油藏
工程和数值模拟综合方法对水平井井排方向、井网形式、水平段长度、裂缝参数组合型式和注采井距参数等方面进
行了研究，研究结果表明：以直井与水平井联合布井的交错排状七点井网布井方式、哑铃型布缝、人工压裂缝密度2
条/（100 m）、水平段长度在700∼800 m、注采井距700∼800 m、排距150 m 时，超低渗透致密油藏水平井初期平均单井
产量约为8.0 t/d，达到直井平均单井产量的4 倍左右，研究成果可以指导超低渗透致密油藏的经济、高效开发。

Optimization Technology for Horizontal Well Pattern in Ultra-low Permeable Tight Reservoirs

There is abundant petro-resources with great development potential in the ultra-low permeable reservoirs located
in Ordos Basin；however，it is difficult to increase the production rate of single well drastically as the formation is of poor
reservoir properties and strong heterogeneity. According to the characteristics of ultra-low permeable formation，the study is
carried out focusing on horizontal well pattern，well drainage direction，parameters of horizontal section and producer-injector
spacing，to establish the effective displacement pressure system. According to the studies，the research results show that the
well pattern is the crisscross row pattern，which is the joint cloth well for the horizontal and vertical wells；the artificial pressure
crack pattern is the dumbbell-shaped；the density of artificial fracture is 2/（100 m）；the length of horizontal section ranges from
700 to 800 m；the producer-injector spacing ranges from 700 to 800 m；the row spacing is about 150 m. Based on the research
results for the horizontal well pattern design，the average initial production rate of single horizontal well in ultra-low permeable
reservoirs is about 8.0 t/d，which is 4 times of the average production rate of vertical well. This proves that this method can
improve the well production rate of ultra-low permeable reservoirs drastically.