Abstract: Much attention should be paid to the phase behavior and properties of such type of fluids as more and more high pressure hydrocarbon reservoirs are discovered world wide.The reservoir fluid is recombined using the separator liquid and gas samples collected from an actual gas field.The phase behavior and physical properties of highly waxy gas condensate is for the first time studied at pressures up to 100MPa.The dew point pressure is measured at 81.6MPa.The reservoir fluid contain much content of wax.The fluid exhibits plain yellow at the pressures above dew point,which is consistent with the fore-mentioned characteristic of high wax content.The generally applied and accurate correlation is used to calculate the compressibility factor of high pressure fluid.The results show that the calculated values are less than the measured ones,the relative error is above 10% and become larger with pressure.

Key words: gas condensate, phase behavior, compressibility factor, density, wax, high temperature, high pressure

摘要： 在国内发现的高温高压凝析气藏越来越多,所以须加强对这类气藏流体相态和物性的实验和理论研究.应用某气田地面油气样品,在实验室配制了高含蜡凝析气流体,研究了高含蜡凝析气在压力很高时的相态和物理参数.通过流体等质膨胀实验,确定了流体露点压力和相应的实验特性,给出了超高压下的压缩因子等数据.采用Dranchk等人的关系式计算了流体在超高压状态下的偏差因子.结果表明,计算值明显小于实验数值,误差大于10%,且随压力的增大误差也增大.地层流体含有大量的蜡组分,在流体压力大于露点压力时,流体的颜色为淡黄色.

关键词: 高温高压, 凝析气藏, 高含蜡凝析气, 流体相态, 压缩因子, 物理性质