Experimental measurement of volumetric and phase equilibrium properties of two high pressure - high temperature reservoir fluids was performed in this work. One fluid is volatile oil and the other is gas condensate. The density, isothermal compressibility, saturation pressure, and liquid fraction below the saturation pressure were determined in the temperature range up to 473.15 K by using a high pressure vibrating tube densitometer and a PVT cell. The obtained data were modelled by using equations of state including Soave-Redlich-Kwong (SRK), Peng-Robinson (PR), volume translated SRK (SRK-VT), volume translated PR (PR-VT) and Perturbed-Chain Statistical Association Fluid Theory (PC-SAFT). Among these models, the performance in saturation pressure prediction is system-dependent and it is hard to generalize the observation. PC-SAFT models volumetric properties satisfactorily. Regarding density calculation, it performs similarly to SRK-VT and PR-VT for the two fluids investigated here. Concerning isothermal compressibility, PC-SAFT is slightly better.

在这项工作中，对两种高温高压储层流体的体积和相平衡特性进行了实验测量。一种流体是挥发性油，另一种是气体冷凝物。通过使用高压振动管密度计和PVT电池，在高达473.15 K的温度范围内确定密度，等温压缩性，饱和压力和低于饱和压力的液体分数。使用Soave-Redlich-Kwong（SRK），Peng-Robinson（PR），体平移SRK（SRK-VT），体平移PR（PR-VT）和扰动链统计协会等状态方程对获得的数据进行建模流体理论（PC-SAFT）。在这些模型中，饱和压力预测的性能取决于系统，因此很难将其推广。PC-SAFT可以令人满意地模拟体积特性。关于密度计算，对于此处研究的两种流体，其性能类似于SRK-VT和PR-VT。关于等温可压缩性，PC-SAFT稍好一些。