Optimization Of Gas Injection Enhanced Oil Recovery Of Condensate Gas Field

Condensate gas reservoir is a special reservoir,playing an important part in the oil industry.During the development process,the retrograde condensate phenomenon will be happen when the formation pressure drops below the dew point pressure, result in the decline of capacity and formation pollution.Therefore, reasonable developing the condensate gas reservoir is the key personnel of technology.Gas injection can effectively maintain the formation pressure, alleviate the condensate intensified degree, it is an important means to develop condensate gas reservoir and EOR.Optimize gas injection can give full play to gas injection effect to achieve the scientific development of gas condensate field goal.This paper on Yaha condensate gas field is a typical gas field by gas injection,to know the relationship between productivity and formation pressure、the gas oil ratio、condensate by combining the gas reservoir characteristics and the mechanism of gas injection miscible;to summary the experience formula of formation pressure and gas injection pressure by mathematical induction;to deduce the experience formula of condensate gas composition changes by using numerical simulation and PR equation of state;the interlayer contradiction of Cretaceous and Eogene’s difference in physical property、unconsistent rate and the not good effect of gas injection in Cretaceous are analysised by using mathematical model; to analysis the rule of gas movement in he injection-production well group by participating in the experimental study of tracer monitoring and combining with field results;to deduce reasonable experience formula by evaluating the effect of gas injection;to put forward some reasonable suggestion and measures for optimization of gas injection,so as to achieve the purpose of reasonable development of condensate gas field,meanwhile,to provide a theoretical basis and some guidance for the development of similar gas field.