长庆油田页岩油大井丛水平井钻井提速技术

长庆油田页岩油大井丛水平井钻井过程中存在摩阻扭矩大、滑动钻进托压、机械钻速低和储层地质导向识别程度低等问题，为解决这些问题，进行了大井丛水平井多层系布局、大偏移距设计、三维井眼轨迹控制和提速工具配套等关键技术研究，在平台井网/井序优化部署、密集式井组轨道防碰设计与控制、水平井一趟钻完钻、储层随钻评价与精准控制和注水区安全钻井等方面取得了技术突破，形成了长庆油田页岩油大井丛水平井钻井提速技术。该技术在华H40、华H60大井丛平台进行了现场应用，井丛水平井井数最多达22口，平均钻井周期18.94 d，较未采用该技术时缩短7.5%。研究与现场应用表明，大井丛水平井钻井提速技术实现了长庆油田页岩油的规模开发，助推了陇东国家级页岩油示范区的建设。 

ROP Improvement Technologies for Large-Cluster Horizontal Shale Oil Wells in the Changqing Oilfield

Large frictional torque, backpressure during slide drilling, low rate of penetration (ROP), poor recognition of reservoirs by geosteering, and other problems are encountered during the drilling of large-cluster horizontal shale oil wells in the Changqing Oilfield. In this regard, this paper studied the multi-layer layout of large-cluster horizontal wells, large?offset design, three-dimensional well trajectory control technology, and drilling tools for ROP improvement. Technical breakthroughs were made in the optimized deployment of well patterns/sequences, the anti-collision design between dense well group trajectories, the completion of horizontal well in one trip, the evaluation and accurate control of reservoirs while drilling, and the safe drilling in water injection areas,etc. Finally, the ROP improvement technologies for large-cluster horizontal shale oil wells in the Changqing Oilfield were developed. The field tests of the technologies were carried out in large-cluster well platforms, the Platform Hua H40 and the Platform Hua H60. The maximum number of horizontal wells in the well clusters was 22, with an average drilling cycle of 18.9 d, which was shortened by 7.5% after using the technologies. The research and field application demonstrate that the ROP improvement technologies for large-cluster horizontal wells have realized the large-scale development of shale oil in the Changqing Oilfield, promoting the construction of the Longdong National Shale Oil Demonstration Base.