Gas–Liquid Flow Behavior in Condensate Gas Wells under Different Development Stages

The phase state prediction methods of condensate gas are relatively mature, but the effect changes on gas–liquid mixture flow behavior and liquid-carrying capacity has not been researched in detail. This study applied PIPESIM software to predict fluid properties under different development stages a reservoir Shengli Oilfield determined diagram physical well stream basis optimized equation (EOS). Then influence change characteristics wellbore critical velocity was analyzed. showed that compared with early stage, fewer heavy components produced ratio is increased late stage reservoir. In addition, pressure loss decreased, rate reduced, liquid-lifting difficulty reduced for gas. reason liquid density decreases obviously due change, while almost unchanged, oil–gas surface tension obviously, resulting decrease velocity. At same time, variation compressibility factor very small, which leads rate.