GAS INJECTION AS A METHOD FOR IMPROVED RECOVERY IN GASCONDENSATE RESERVOIRS WITH ACTIVE SUPPORT

摘要

One of the greatest problems currently in the oil industry is therndifficulty for reaching a high hydrocarbon recovery in gascondensaternfields, the main problem being the pressure andrnthe presence of active aquifer in such reservoirs.rnWhen a reservoir lacks active aquifer their recovery are veryrnlow of the order of 20 to 30 % for condensates and betweenrn70 to 80 % for the gas.rnIn reservoirs with active aquifers, their recovery factors arerngreater, of the order of 50% in condensates and about 70% forrngas; however, a severe water invasion exists in the productivernareas leaving about 40% of trapped hydrocarbons.rnThe present paper describes a technical study for thernimplementation of recovery methods improved with gases, andrnthe different factors of hydrocarbon recovery factors obtainedrnusing different gases such as dry gas, CO2, nitrogen, flue-gasrnand other feasible combinations of injection gasesrnThe best method obtained in such study consists on therninjection of a dry gas in the zone of interest very near thernwater front, in order to avoid the entry of the water to the wellrnand to recede the level of the current water in the perforationsrnwith high water cut, thus recovering trapped hydrocarbons ,rntherefore obtaining high recovery factors of the order of 70 torn90 % of the original volume.