雅克拉-大涝坝凝析气田的相态特征

雅克拉-大涝坝凝析气田自投产以来，表现出流体特性复杂多变，生产井普遍产水，产量递减快的特点。通过对雅克拉-大涝坝凝析气田地层流体开展三相（油-气-地层水）相态全分析实验，并结合PVT实验过程的相态数值模拟计算，分析了该区深层高温高压凝析气藏富含气态可凝析液（凝析油和凝析水）的PVT相态特征，研究了地层流体降压过程中析出液量与压力的变化关系，确定了初始凝析压力、最大凝析压力、最大反凝析油、凝析水量、富含气态凝析水凝析油气体系的临界温度和临界凝析温度等特征参数，从而为减少地层污染、进行开发方案的调整提供了依据。

Phase Behaviors of the Yakela-Dalaoba Condensate Field

The Yakela Dalaoba condensate field mainly presents the following features since being put into production: complex and changing fluid properties, generally producing water in production wells and rapid yield decline. By conducting the experiment of oil gas formation water phase total analysis on the formation fluid in the Yakela Dalaoba condensate field and combining the calculation of phase numerical simulation in the process of PVT experiment, the PVT phase behavior in the deep condensate gas reservoir under the condition of high temperature and pressure and rich in gaseous condensable fluid (condensate oil and condensate water) in this area has been analyzed, the variable relationship between the liquid amount precipitated and pressure has been studied and characteristic parameters including initial condensate pressure, maximum condensate pressure, maximum retrograde gas condensate, quantities of condensate water, critical temperature and critical condensate temperature in the gas system with abundant gaseous condensate water and condensate oil has been determined, so as to provide the basis for the reduction of formation contaminant and the adjustment of development program.