高含蜡凝析气流体的气-固相变特征

国内外近年在深部储集层发现越来越多高压地层流体。深部储集层温度很高，地层流体常出现反凝析现象，更重要的是，深部地层流体因含有大量重质烃类而出现气—固相交。采用固相沉积激光探测系统实测高压凝析气流体的固相沉积动态，结果表明固相开始沉积的压力随温度降低而升高。应用热力学原理对此现象进行了理论分析。图2参15

Gas-solid phase behavior of high waxy retrograde condensate gas

In recent years, more high pressure underground fluids have been discovered within deeper traps targeted by exploration activities. Retrograde condensation usually occurs at high reservoir temperature conditions. More importantly, the formation fluids may exhibit gas solid phase transition due to the presence of high molecular weight paraffin. This unusual phase change is investigated by high temperature and high pressure solid detection system. The experimental results show that the solid deposition pressure increases with decreasing temperature. In addition, this phenomenon is explained theoretically in terms of thermodynamics.