凝析气藏流体相态行为的实验研究

EXPERIMENTAL STUDY ON THE PHASE BEHAVIOR OF GAS CONDENSATES

应用ＦｉｓｈｅｒＡｕｔｏｅｄｅｓｔ８００型实沸点蒸馏装置切割了华北苏桥４０２井凝析气的常压油罐油．并测定了所得各窄馏分的物性．将已知物性的窄馏分与采自同一井的分离器气体按一定的比例配制成三个合成凝析气样品。应用ＲＵＳＫＡＰＶＴ装置测定了这三个样品的Ｐ－Ｖ关系和反凝析液体积．用实验方法研究了衰竭凝析气的残余液体通过注二氧化碳气体再蒸发回收的初步规律。

The Fisher Autodest 800 TBP Distiller was used to cut the stock tank oil fromthe gas condensate well Suqiao 402 of Huabei oilfield. Three Chinese synthetic gas condensatefluids were prepared from the narrow cuts. and the scparator gas from the same well. TheRUSKA PVT Instrument was then applied to measure P-V relations at different tempratures forthese three samples, with special attention being paid to the accurate determination of theretrograde liquid volumes in the process of constant composition expansion. Carboll dioxideinjecting revaporization of the condensed oil left in the depleted reservoirs for two syntheticChinese gas condensates was also simulated with the RUSKA three-window equilibrium cellwhich was empty of filling materials. The measured relations of the retrograde liquid volumeto the injected amount of CO_2 shows that injection of CO_2 to the liquid oil produced duringpressure depletion is very effective.