富含凝析水的凝析气井产能分析新方法  

NEW METHOD OF PRODUCTIVITY ANALYSIS IN GAS CONDENSATE WELL WITH CONDENSED WATER

作　　者：常志强[1] 康征[2] 孙雷[1] 严文德[1] 孙良田[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室.西南石油大学 [2]西南油气田川中油气矿勘探开发研究所

出　　处：《钻采工艺》2006年第4期41-43,共3页Drilling & Production Technology

基　　金：油气藏地质及开发工程国家重点实验室(西南石油大学)基金项目(PLN0126:复杂裂缝性油气藏开采动态预测)。

摘　　要：常规凝析气井产能分析常沿用单相气井的产能分析进行经验性修正或在此基础上结合常规烃类流体相态研究方法建立的考虑地层油气两相相态变化的产能分析方法,没有考虑地层凝析水对产能的影响。随着天然气勘探开发向地层深部的发展,一些特殊的如异常高温、高压富含气态凝析水的凝析气藏不断涌现,并且所占的比例越来越大,当温度较高时,地层束缚水、边底水和可动间隙水与烃类流体的互溶能力就较强,烃类流体中含水量就会增加,再用常规的烃类流体相态研究方法去指导开发这些特殊的凝析气藏,就致使凝析气藏在开发方式、油气藏工程设计和动态分析方面产生一定的误差。因此,有必要建立考虑多相流体复杂相态变化的凝析气井产能分析新方法,以便得到更为精确的凝析气井生产动态。文中结合气-液-液三相流体相平衡热力学闪蒸计算,建立了考虑近井地带反凝析液饱和度分布以及动态污染影响的凝析气井产能分析新方法。根据文中给出的凝析气井产能预测模型在数值求解的基础上,编制了相应的计算程序,可准确预测不同时期凝析气井的地层流入动态。The regular productivity analysis method of gas condensate well, considering the oil and gas phase behavior variety, ignores the influence of condensed water on productivity. With more and more natural gas exploited in deep reservoir, some special condensate gas reservoirs with rich condensed water are emerging continuously. If using conventional phase analysis ways in such special condensate gas reservoirs exploitation, it will result in some errors in producing method, engineering design and performance analysis. So, in order to obtain the exact production performance of gas condensate well, a new productivity performance analysis method in gas condensate well is established, which considers complex phase behavior of multi-phase liquid. By combining the gas-liquid-liquid 3-phase equilibrium flash calculation and considering the distribution of retrograde condensed liquid saturation and effect of reservoir contamination in immediate vicinity of wellbore, a formation flow model is set up. On the basis of the methods and calculation models presented by this paper, the corresponded computer programs has been developed by using VB computer language and Access data base. This software package can accurately predict the deliverability performance of gas condensate well in different times.

关 键 词：凝析气井 相平衡 渗流 相态 凝析水 产能 

分 类 号：TE328[石油与天然气工程—油气田开发工程]