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LHSS方程是为适应我国低含凝析油凝析气藏烃类体系的相态计算的需要而建立的，是“七五”国家重点攻关项目的成果，它已成功地用于凝析气藏烃类体系的高压相行为的预测。为拓宽该方程的适应范围，文章从热焓的普适性热动力学关系出发，推导了该方程的热力学焓差方程式，并把它应用于绝热节流计算过程。通过与公认的目前最好地用于低温分离SHBWR方程模拟结果对比，说明LHSS方程可用于地面低温分离模拟和油气分离设计，解决了地下高温高压相态和地面低温分离相态采用不同的状态方程问题。

FEASIBILITY ANALYSIS OF APPLYING LHSS EQUATION IN SURFACE NATURAL GAS LIQUID RECOVERY UNDER LOW TEMPERATURE CONDITION

LHSS equation was set up for meeting the needs of phase behaviorcalculation of hydrocarbon system of the condensate gas reservoir with low condensate content in China， being a result of national scientific and technological key research project of the “Seventh Five-Year Plan”， and it has been successfully used for predicting the high-pressure phase behavior of hydrocarbon system of condensate gas reservoir． In order to widen the scope of application of the equation， a thermodynamical enthalpy potential equation of the LHSS equation was derived according to the thermodynamical relation of universality of the enthalpy， and it has been used for calculating the process of adiabatic throttle． In comparison with the result simulated by SHBWR equation which is generally recognized to be the best one used for low temperature separation at present， it is indicated that the LHSS equation may be used for surface low temperature separation simulation and oil-gas separation design， thus solving the problem of adopting different state equations for subsurface high-temperature and high pressure phase behavior and surface low temperature separation phase behavior respectively．