【作者】 朱玮； 王卫阳；

【Author】 ZHU Wei;WANG Weiyang;School of Petroleum Engineering,China University of Petroleum (East China);

【机构】 中国石油大学(华东)石油工程学院；

【摘要】 目前凝析气相态预测方法已较为成熟,但人们对因相态变化所引起的井筒流动压降和气体携液能力变化规律的认识还不够深入,论文在优选状态方程预测凝析油气相图和物性的基础上,应用Pipesim软件对胜利某凝析气藏不同开发阶段流体相态规律进行预测,并分析其相态变化特征对井筒流动和气体携液规律的影响。研究表明,凝析气藏衰竭式开发初期与后期相比,产出流体重组分减少,生产气液比增加,造成井筒压力损失减少,临界携液流量减小,气体携液难度减小,其原因是相态发生变化导致液相密度明显减小,气相密度几乎不变,气液表面张力明显减小,造成临界携液流速减小。同时,气相压缩因子变化幅度很小,最终导致临界携液流量减小。更多还原

【Abstract】 The condensate gas phase state prediction method has been relatively mature,but there is not enough understanding of the law of changes in wellbore flow pressure drop and gas carrying capacity caused by phase changes. The paper applies Pipesim to predict the fluid phase patterns at different development stages of a condensate reservoir of Shengli Oilfield on the basis of the preferred equation of state to predict the phase diagram and physical properties of condensate, and analyzes the influence of its phase change characteristics on wellbore flow and liquid loading patterns. The study shows that compared with the late stage of condensate gas reservoir depletion development,the heavy fraction of well fluid is reduced, the gas-liquid ratio in production is increased,and the wellbore pressure loss is reduced, the liquid loading gas rate is reduced, and the difficulty of gas carrying liquid is reduced. The reason is that the liquid density decreases obviously due to the phase change, while the gas density is almost unchanged,and the oil-gas surface tension decreases obviously, resulting in the decrease of the liquid loading velocity. At the same time, the variation of gas compressibility factor is very small, which leads to the decrease of the liquid loading gas rate.更多还原