Technical-Economic Policy And Potential Assessment Research For Low-grade Reservoir

After forty years of exploration and development， new discovered and provedundeveloped reserves are low-grade. Nearly three fourths of newly added provedreserves lie in low permeability，beach-bar sand and deep reservoir. Undevelopedreserves lie in ultra-low permeability，thin sand heavy oil，deep reservoir and buriedhill reservoir. These kind of reserves have is difficult to be developed and need highinvestment to proceed productivity construction. There is technical bottleneck andneed technical research to exploit these reserves. With the development of main oldoilfield， many units with high water cut and recovery percent and many oil wellswith low production and efficiency are in the marginal development status. Feasibilityof EOR and exploration potential need further study.On the basis of studying geological conditions，production rule and economiceffectiveness of produced low-grade reservoir，analyzed the main factors influencedexploitation and economic effectiveness. Combining reservoir characteristics ofundeveloped low-grade reservoir in2007，studied the index which can reflectreservoir type，development mode，development condition and economic benefit usingreservoir engineering， mathematical statistics and economic evaluation method.Technical-economic policy limitation was provided. Then selected some low-gradereservoirs in Shengli Oilfield and assessed scale of effectively developed reserve，productivity and workload in different technique and economic conditions. Finallycountermeasures to develop low-grade resource economically and efficiently，considering development policy，management pattern，investment policy，wereoffered.