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

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.