海上低渗凝析气藏注气解堵相行为变化研究  

Study on phase behavior of gas injection and plug removal fluid in offshore low permeability condensate gas reservoir

作　　者：尹鹏 张志军 徐浩 石端胜 YINPeng;ZHANG Zhi-jun;XU Hao;SHI Duan-sheng(CNOOC Ener.Tech.Drilling&Production Co.,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《精细与专用化学品》2023年第6期1-5,共5页Fine and Specialty Chemicals

基　　金：“十三五”国家科技重大专项示范工程(2016ZX05058)。

摘　　要：凝析气藏流体性质较为复杂,在开发过程中,当地层压力降至露点压力以下后,近井地带流体的性质及相态都会发生复杂的变化。针对海上深层低渗凝析气藏地质油藏特征,采用相态分析技术对其进行注气解堵以提高采收率。注入气体介质主要有CO_(2)、N_(2)、伴生气和干气。基于流体相态实验和气-液相平衡理论,对M气田凝析气藏进行注气解堵相态变化特征研究。结果表明:M气田凝析气藏流体体系随着气体注入量增加而逐渐变轻;同时,注入不同气体介质后流体体系相态变化特征表明:注CO_(2)驱替解堵效果最优,伴生气次之,其次是干气,注N_(2)最差。推荐吞吐注入伴生气对M气田凝析气藏解堵,降低反凝析污染程度,提高气井产能是可行的。Condensate gas reservoir fluid properties was relatively complex,in the process of mining when pressure was reduced to below the dew point pressure gas reservoir fluid properties and phase behavior will occur after the complex changes.According to the characteristics of the offshore deep low permeability condensate gas reservoir,choose gas injection development way to improve condensate gas reservoir recovery efficiency.Injection of gas medium mainly CO_(2),N_(2),associated gas and dry gas.Based on the fluid phase behavior experiment and gasliquid phase equilibrium theory of M gas condensate gas reservoir for gas injection solution phase change characteristics study,the results showed that the M gas condensate gas reservoir fluid system with the increase of gas injection and lighter gradually.At the same time according to different system of fluid phase state after injection of gas medium characteristics showed that CO_(2)injection displacement plugging effect of the optimal solution,lease take second place,followed by dry gas,and the worst N_(2).Finally recommended the condensate gas reservoir of M gas stimulation associated gas injection solution.

关 键 词：凝析气藏 注气解堵 相平衡 相态变化 

分 类 号：TE372[石油与天然气工程—油气田开发工程]