涪陵页岩气田水平井组优快钻井技术

Optimal and Fast Drilling Technology for Horizontal Wells in Fuling Shale Gas Field

摘要:

涪陵页岩气田是我国第一个投入商业化开发的国家级页岩气示范区，与北美相比，涪陵地区地表条件、地质条件和页岩气储层特征更加复杂、储层埋藏更深，开发初期钻井机械钻速低、钻井周期长、成本高。为此开展了涪陵页岩气田水平井组优快钻井技术研究，形成了集水平井组钻井工程优化设计、水平井优快钻井技术、国产低成本油基钻井液、满足大型压裂要求的长水平段水平井固井技术、山地特点“井工厂”钻井技术以及绿色环保钻井技术为核心的页岩气水平井组优快钻井技术体系。在涪陵页岩气田推广应用了290口井，完井256口，平均单井机械钻速提高了182%，平均单井钻井周期缩短了55%，平均单井钻井成本降低了34%。为涪陵页岩气田年50亿m3一期产能建设的顺利完成提供了强有力的技术支撑，对我国页岩气规模开发提供了重要的借鉴和引领作用。

Abstract:

Fuling shale gas field is the first national shale gas demonstration area for commercial development. Compared with North America, the surface conditions, geological conditions and shale gas reservoir characteristics are more complex, the reservoir buried deeper with low ROP, long drilling cycle and high cost. Therefore the research on optimal and fast drilling technology for horizontal wells in Fuling shale gas was carried out, with engineering design optimization for horizontal wells drilling, optimal and fast drilling, domestic low-cost oil base drilling fluid, well cementing technology for long horizontal section for the requirement of massive hydraulic fracturing, mountain features well factory drilling technology and green environmental protection drilling technology, a fast drilling technology system for shale gas horizontal wells. This system has been applied in 290 wells in Fuling shale gas field with completion of 256 wells. The average ROP increased by 182%, average drilling cycle shortened by 55% and average drilling cost decreased by 34% in each well. This provides a strong technical support for first phase production capacity of 5 billion m3 in Fuling field gas, and plays important leading role for the scale development of shale gas in China.