Evaluation and Development Suggestions of Nitrogen Drilling and Completion Technology for Developing Deep Tight Sandstone Gas
The deep low-permeability tight sandstone gas reservoirs have high content of clay cement in the ma-trix,small pore throats,low permeability,low porosity,and strong hydrophilicity.The use of conventional wa-ter-based working fluids for exploration and development is prone to reservoir damage,and the permeability is difficult to recover after damage.The nitrogen drilling and completion technology can fundamentally avoid reser-voir damage caused by solid-liquid phase invasion in drilling fluid,effectively protect the reservoir,and improve single well production.This article reviews the practical application of nitrogen drilling and completion technolo-gy in the development of deep tight sandstone gas in recent years.It systematically evaluates the effectiveness of this technology in developing deep tight sandstone gas from five aspects:reservoir protection,timely discovery of gas layers,natural production,providing geological sweet spot basis,and providing auxiliary basis for determi-ning gas reservoir enrichment laws.At the same time,it focuses on wellbore trajectory control,wellbore instabil-ity,and downhole rock burst induced stuck drilling This article elaborates on the research directions of nitrogen drilling and completion technology in the future from four aspects:drill pipe completion,well location and well section optimization,in order to provide reference for the efficient development of tight sandstone gas in the Xuji-ahe Formation of the Sichuan Basin and other similar gas reservoirs at home and abroad.
Western Sichuandeep tight sandstone gasnitrogen drilling and completion