Research on the retrograde condensate pollution characteristics and developement strategies of offshore gas condensate reservoir
Retrograde condensate pollution of gas reservoirs decreases the production capacity in offshore P Gas Field.According to the production dynamic data of gas field,phase transformation characterization in gas reservoir,dynamic monitoring data,the distribution law of retrograde condensate saturation in the formation and the influence of different condensate content and reservoir physical properties on the distribution of retrograde condensate saturation is analyzed by a radial model.The results show that the reservoir effective permeability damage rate is 42％and production capacity decline rate is 51％under the maximum retrograde pressure.The higher the condensate content of gas reservoir,the higher the condensate saturation and the wider the pollution range of condensate near the well.The lower the permeability of the reservoir,the worse the fluidity of the condensate and the greater the pollution degree of the reservoir.Three wells gas injection huff and puff scheme was formulated based on this study,which can effectively increase the daily oil production of a single well by nearly two times.Field tests have proved that gas injection huff-and-puff can effectively restore formation capacity,reduce condensate pollution,recover gas well production capacity,and finally the condensate recovery rate of offshore condensate gas reservoir is improved.
retrograde condensate pollutioncondensate gas reservoirradial modelgas injection huff and puff
万方数据
维普
