多孔介质对凝析气露点压力影响研究

Study on effect of porous media on dew point pressure of condensate gas

关于多孔介质对凝析气露点压力的影响,不同学者研究得出的结论各不相同,有的结论甚至相反。到目前为止还没有一种理论能较好地解释这种矛盾现象。在大量调研国内外多孔介质对相变影响的基础上开展实验研究,得出了多孔介质对凝析气露点压力有影响的结论;进行理论研究,建立了分别考虑毛细管压力和吸附现象的露点压力计算模型。针对中原油田白庙、桥口凝析气以及模拟凝析气流体分别进行了实例计算。结果证明毛细管压力和吸附现象对凝析气露点压力有影响。

For the effect of porous media on dew point pressure of condensate gas, different researchers have different or even contrary conclusions. Up to now, there is no theory that can well explain this contradictory phenomenon. Based on a large amount of research on effect of porous media on phase change in condensate gas reservoir, and experimental research is carried out and result shows that porous media has effect on dew point pressure of condensate gas. Two theoretical models for dew point pressure calculation are established, one of which considers effect of capillary pressure and the other considers adsorption in porous media. Calculations are performed for condensate gas of Baimiao and Qiaokou blocks in Zhongyuan Oilfield and simulated condensate gas fluid. Result shows that capillary pressure and adsorption phenomenon have effects on dew point pressure of condensate gas