富含凝析水的凝析油气体系相态研究

在传统的忽略地层水影响的烃类体系相态特征研究中,由于都是油或气态的烃类,所以在进行热力学性质的研究时,选择的热力学状态方程不需考虑强极性物质的影响,且形成的传统的无水烃类体系相态研究理论体系经过多年的发展已趋完善。但由于极性物质水的存在,在富含气态凝析水的凝析气藏油气体系相态特征研究的全过程中,油气藏的异常高温、高压状态直接影响到实验设备的选择、实验工艺流程的设计,况且传统的无水烃类相态研究的热力学模型也应该改进或提出新的热力学模型,其状态方程和对应混合规则的选择也要作出适当的改进。随着天然气勘探开发向地层的深部发展,一些特殊的(如异常高温、高压富含气态凝析水)的凝析气藏不断被发现,并且所占的比例越来越大,当温度较高时,地层束缚水、边底水和可动隙间水与烃类流体的互溶能力就较强,烃类流体中含水量就会增加,因此,再用传统的烃类流体相态研究方法去指导开发这些特殊的凝析气藏,就会使其在开发方式、油气藏工程设计和动态分析方面产生一定的误差。系统阐述了富含凝析水的凝析油气体系相态的研究方法和意义,并给出了适用于富含气态凝析水的烃类体系的气-液-液三相相平衡计算模型。

CONDENSATE OIL-GAS MIXTURES PHASE BEHAVIOR STUDY WITH RICH GASEOUS CONDENSATE WATER

The common oil-gas mixtures phase behavior study ignores the influence of formation water, which is classical but not considering the strong polar material. For the existing of polar material water, the condensate oil-gas mixtures phase behavior study with rich gaseous condensate water is different from the common phase behavior study. In the process of study with rich gaseous condensate writer, the oil and gas reservoir is under abnormally high temperature and pressure which could influence tire choice of expert mental facilities, the design of experimental process flow. And the traditional thermodynamics models should be adapted. With more and more natural gas exploited in deep reservoir,some special condensate gas reservoirs with rich gaseous condensate water in abnormally high temperature and pressure are emcrg ing continuously. When the formation under tire condition of high temperature, more and more bottom wa ter, edge water and aetive porous water will coexist with condensate gas in vapor. If we still use convcn tional behavior study ways in such special condensate gas reservoirs,it will result in many errors in produc ing methods,engineering design and performance analysis. This paper prescnted the methods and meaning of phase behavior study with rich gaseous condensate water,in the meantime ,presented a Calculation rood el of gas-liquid-liquid 3-phase equilibrium of condensate oil-gas mixtures with rich gaseous condensate wa ter.