大庆古龙页岩油密切割体积压裂工艺参数优化探索

Exploration of optimization of volume fracturing process parameters for intensive cutting of Daqing Gulong shale oil

为解决大庆古龙页岩油因其储层致密且层理缝发育缝高受限导致水平井增产困难的问题,探索青山口组Q9储层的有效动用程度,开展了密切割压裂工艺最大化提高储层改造体积研究,优化了密切割体积压裂工艺参数,将平均簇间距缩短至7 m,平均段间距52 m,可大幅提高页岩储层缝控程度;形成了以水平井16~20 m^(3)/min大排量,冻胶造主缝和滑溜水造复杂缝网、石英砂中小粒径支撑剂组合和高强度加砂等为核心的大规模体积压裂关键技术,保证了主裂缝及各级层理转折裂缝有效支撑。现场试验表明,该技术能够显著提高水平井压裂效果,单井18个月累计产油量达10969.3 m^(3),是前期水平井产油量的3倍以上。研究结果表明,水平井大规模密切割体积压裂技术可以有效解决致密页岩油储层难动用的问题,为大庆古龙页岩油高效开发提供了强有力的技术支撑。

In order to solve the problem of difficulty in increasing production in horizontal wells caused by the tight reservoir and limited development of bedding fractures in Daqing Gulong shale oil,and to explore the effective utilization degree of the Q9 reservoir in the Qingshankou Formation,a technical breakthrough was carried out to maximize the volume of reservoir transformation through the dense cutting fracturing process.The parameters of the dense cutting volume fracturing process were optimized,reducing the average cluster spacing to 7m and the average segment spacing to 52 m,which can significantly improve the degree of shale reservoir fracture control;A large-scale volume fracturing key technology has been formed,with a large displacement of 16~20 m^(3)/min in horizontal wells,complex fracture networks formed by gel and slippery water,a combination of small and medium-sized proppants in quartz sand,and high sand strength as the core,ensuring effective support for the main fractures and all levels of bedding transition fractures.Field experiments have shown that this technology can significantly improve the fracturing effect of horizontal wells,with a cumulative oil production of 10969.3 m^(3)per well in 18 months,which is more than three times the oil production of previous horizontal wells.The research results indicate that large-scale dense cutting volume fracturing technology for horizontal wells can solve the problem of difficult utilization of tight shale oil reservoirs,providing strong technical support for the efficient development of Daqing Gulong shale oil.