凝析气井压裂生产动态模拟研究  

STUDY ON PRODUCTION PERFORMANCE SIMULATING FOR CONDENSATE RESERVOIR FRACTURING

作　　者：赵金洲[1] 胡永全[2] 朱炬辉[2] 

机构地区：[1]"油气藏地质与开发"国家重点实验室.西南石油学院 [2]西南石油学院

出　　处：《天然气工业》2004年第10期86-88,共3页Natural Gas Industry

基　　金：中石化集团公司攻关项目"东濮凹陷东部含气区深层凝析气藏评价及储层改造研究"部分研究成果。

摘　　要：凝析气藏是最复杂、最特殊的一类油藏,生产过程中随着地层压力的下降会引起重烃相间传质、相态变化,使得研究与认识凝析气藏压裂井产能更加复杂化。文章假设储层内烃的流动为等温的达西渗流,且组成油气烃类的各个组分在渗流过程中相间传质及相态变化是在瞬间完成的;应用物质平衡原理和运动方程建立了总烃和第i组分烃的渗流方程,结合相平衡计算理论、初始条件和定压边界条件,提出了预测压裂后凝析气井生产动态的数学模型;分析了凝析气藏可能存在的不同渗流区域与相应的渗流特征,应用隐式压力显式饱和度(IMPES)方法分别进行有限差分数值计算,给出了压裂后凝析气井凝析液、天然气产量动态,不同时刻地层中的凝析液饱和度分布曲线。由于凝析气藏与常规油气藏的性质差异,其生产动态也明显不同,这为准确进行优化压裂设计提供了计算分析方法。Condensate gas reservoirs are one of the most complicated and special reservoirs. The inter phase mass transferring and phase behavior changing of heavy hydrocarbons will happen during production process as the formation pressure drops down, which makes studying and understanding the production performance of fractured wells of the condensate gas reservoirs more complicated. Assuming the hydrocarbon flow is Darcy percolation with constant temperature in the reservoir, and the inter phase mass transferring and phase behavior changing of hydrocarbons consisting of various components is completed instantaneously, the percolation equation is established for the total hydrocarbons and hydrocarbon component based on the material balance principle and motion equation. Also, combining the percolation equation with the phase balance calculating theory and the initial conditions and constant pressure boundary conditions, the mathematical model is developed to predict the production performance of condensate gas wells after fracturing. It is analyzed condensate gas reservoirs may have different percolating zones, which have different percolation features. Using finite difference method with implicit pressure and explicit saturation, the production performance of condensate gas wells after fracturing and the distribution curves of condensate saturation at different time in the reservoir are obtained. The production performance of condensate reservoirs is obviously different with that of conventional reservoirs because their properties are different. This paper offers a calculation and analysis method for optimizing fracturing design.

关 键 词：凝析气井 凝析气藏 压裂井 凝析液 相态 生产动态模拟 压裂设计 计提 天然气产量 产能 

分 类 号：TE377[石油与天然气工程—油气田开发工程]