Study On Calculation Of Production Indexes And Development Methods Of Ultra-low Permeability Reservoir

Based on the actual data of one ultra-low permeability reservoir named Fan 154 block in Daluhu oilfield,this paper studied the unique dense reservoir properties,fluid seepage law and ways of development of ultra-low permeability reservoir,researched on it's unique development features in order to establish a method for development index calculation of ultra-low permeability reservoirs,and to work out new ways for ultra-low permeability reservoirs development,in order to better develop the ultra-low permeability reservoirs.Based on the actual production data,this paper analysised reservoir development characteristics of ultra-low permeability reservoirs.And studied the productivity sensitivity analysis of fractured horizontal well using numerical simulation technique.Based on consideration of threshold pressure gradient and pressure sensitive effect,this paper studied the elastic recovery of ultra-low permeability reservoirs.And respectively studied the production of ultra-low permeability reservoirs under elastic development and water flooding development condition.And finally studied the water flooding law of ultra-low permeability reservoirs.Study the repeated fracturing of horizontal wells development technology.,contrasted results with conventional methods,and finally optimized its production.The results show that low permeability reservoir production showed a three-stage,namely highly productive period,decline period,low productive period.The production is affected by threshold pressure gradient,pressure sensitive effect and parameters of fractured horizontal wells.The elastic recovery calculated by theory method is higher than that calculated by numerical regression method,meet the actual.Production of elastic product method and water flooding product method showed a greater difference due to different energy supplement.Waterflood law of low permeability reservoir have relevant with threshold pressure gradient as well as the pressure sensitive effect,showing different characteristics comparing with the conventional reservoir.Repeat fracturing of horizontal wells development technology have better development results compared to conventional development methods.