大庆油田沙河子组致密砂砾岩气藏效益开发实践OA

Deep glutenite gas reservoirs in Shahezi Formation of Daqing Oilfield are characterized by large burial depth,tight reservoirs,high heterogeneity and low well productivity.Main controlling factors for reservoir quality remain unclear,and optimal development strategies are yet to be defined,posing severe challenges to economic pro-duction.Through reservoir distribution and dynamic characterization,2 types of reservoirs are identified including thick-bedded and thin-interbedded glutenite reservoirs.Thick-bedded reservoirs demonstrate much potential for eco-nomic development than thin-interbedded reservoirs.Through the research on development techniques,including"sweet spot"optimization,integrated geoscience-engineering modeling and optimized deployment,economic devel-opment technical limits and 3D geological and geomechanical models for tight glutenite gas reservoirs are estab-lished,forming optimized deployment strategy for tight gas reservoirs.Pilot test for economic production increase is performed in SOS9H well block targeting thick-bedded tight glutenite gas reservoirs.Progressive development of gas wells in test area achieve successive breakthroughs in production,with maximum open-flow capacity reaching 186.0×104 m3/d,demonstrating promising economic potential.Understandings from this pilot test area solid founda-tion for large-scale economic development of tight gas in Shahezi Formation in Daqing Oilfield.The research pro-vides valuable technical guidance for economic development in similar tight gas reservoirs.