凝析气藏循环注气过程流体相态特征  

Gas Condensate Phase Behavior in Process of Cyclic Gas Injection

作　　者：焦玉卫[1] 谢伟[2] 邸宝智 梁涛[1] 刘立炜[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油塔里木油田分公司,新疆库尔勒841000 [3]中国石油大港油田分公司采油三厂,天津061023

出　　处：《新疆石油地质》2012年第6期704-707,共4页Xinjiang Petroleum Geology

基　　金：国家973项目(2007CB209500)

摘　　要：影响露点压力的主要因素是流体组成、温度、多孔介质、非平衡效应等,凝析气藏注气开发过程中受注气波及的影响,流体组成分布在地层中差别较大,是影响地层中露点压力分布的关键因素。凝析气藏注气开发之前,或者衰竭开发过程中,当地层压力高于露点压力时,地层中流体为气相状态,可以近似用一个相态来代表地层中的流体。循环注气开发条件下地层中流体组成的变化极为复杂,流体相态特征随流体组成及压力温度而变化。以状态方程为理论基础,选取某实际凝析气藏有代表性的流体样品,总结了凝析气藏循环注气过程中的3种相态变化趋势,对比了实际取样流体的PVT实验结果,结合实际开发的凝析气藏进行模拟计算,研究了其露点压力在地层中的分布特征。Fluid composition, temperature, porous media, and non-equilibrium effect are the main factors affecting clew-point pressure. In process of gas injection development of gas condensate reservoir, the fluid composition in formation is of great difference in distribution due to sweep efficiency effect. Before cyclic gas injection or during depletion development, the fluid in formation appears gas phase behavior when the formation pressure is higher than the clew-point pressure, and such a fluid could be approximately regarded as a gas phase behav- ior. Under the cyclic gas injection, the change of the fluid composition in the formation is very complicated, and the fluid phase behavior will change with fluid composition, formation pressure and temperature. Based on the theory of equation of state, the typical fluid samples from a real gas condensate reservoir are selected in this paper, three changing trends of phase behavior in the process of cyclic dry-gas in- jection are presented, and the PVT test results from the real samples are compared. Finally, the distribution characteristics of dew-point pressure is given, integrated with studies of simulation and calculation for the gas condensate reservoir.

关 键 词：凝析气藏 循环注气 相态特征 露点压力 

分 类 号：TE372[石油与天然气工程—油气田开发工程]