Feasibility Study Of Gas Injection Development In Buried Hill Reservoir

Xinglongtai buried hill is a thick oil reservoir with 1.27 tons proven geological reserves,and the oil range is 2300 meters.It is a relatively self-contained reservoir block that Liaohe oilfield discovered in recent years.The block is with complex lithology,strong reservoir heterogeneity,dual medium characteristics,and the fracture is dominated by high angle fracture.It is a massive reservoir with bottom water.The original development plan is designed as a set of layers,piecewise development,using straight wells to control and complicated horizontal wells to develop,forming the longitudinal stacked and flat wrong tridimensional well pattern,and to deploy entirely,and batch separately,achieving to produce as much as possibile reserves of less wells,and build one million tons of production capacity in three years.At present the block mainly relies on natural energy,as the development continues,affecting by the decline of formationpressure and bottom water coning,the production decline is speeding up,and is badly in need of formation energy supplement to maintain stable yield.During the development,the lower part water injection test was put forward,and the water was channeling fast.Achieving sustainable development is the focus of future work.In this study,different injection medium minimum miscibility pressure(MMP)was determined by experiment tube in laboratory.The gas expansion experiment recognised the oil change after gas injection,and the long core displacement experiment recognised the displacement efficiency of different gas injection methods,and different contribution of the matrix and fracture systems.Through the above study,the dual media reservoir gas injection immiscible flooding mechanism is preliminary explorated.Combining with the development experience and the actual reservoir at home and abroad,the feasibility of buried hill reservoir development is demonstrated to guide the gas injection stereo development project.It is desighed to conduct the top immiscible gas injection displacement gravity field test in Xinggu 7 blocks,in the tridimensional development well pattern condition,in order to give full play to the vertical displacement of stereo combined supply effect,to effectively improve the recovery,the development strategy such as reasonable injection interval,injection production well pattern,gas injection rate are studied.By optimizing the development indicators,4 new gas injection wells were designed in the upper level reservoir,and were expected to enhance the oil recovery to?This research is of positive significance to improve the dual media massive reservoir development effect,and has very broad application space and value in the Liaohe oil field,for the future of gas injection development plays a positive role in promoting and guiding.