不同气介质-原油热辅助混相实验  

Experiments on thermal miscible rules of different gas media and crude oil

作　　者：席长丰 赵芳[1,2] 王伯军 刘彤[1,2] 齐宗耀 刘鹏[1,2] XI Changfeng;ZHAO Fang;WANG Bojun;LIU Tong;QI Zongyao;LIU Peng(State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]提高石油采收率全国重点实验室,北京100083 [2]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2024年第6期1347-1354,共8页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司科技项目“热辅助混相驱油技术研究”(2023ZG18)。

摘　　要：利用“界面消失法”开展高温高压可视化PVT(压力-容积-温度)筒实验,研究不同气介质-原油热混相规律。实验表明:恒压升温过程中CO_(2)-原油混相存在两个混相温度域,实验压力为15 MPa时,温度低于140℃,混相带呈液相特征,温度对混相过程起抑制作用;温度高于230℃,混相带趋向气相特征,提高温度有利于形成混相。恒压条件下,温度足够高时,烟道气、N_(2)与原油可以实现混相;温度较低时,CO_(2)促混效果明显,混相温度以N_(2)最高,烟道气居中,CO_(2)最低;温度较高时,CO_(2)促混效果逐渐下降,N_(2)、烟道气与原油混相温度值逐渐接近,混相过程以原油轻组分蒸馏挥发混相为主,相平衡时气相中存在大量轻烃组分,混相带呈气相特征。The high temperature and high pressure visualization pressure-volume-temperature(PVT)experiments of different gas media-crude oil were carried using the interface disappearance method.There are two miscible temperature domains in the miscibility of CO_(2)-crude oil during heating process under constant pressure.Under the experiment pressure of 15 MPa,when the temperature is less than 140℃,the miscible zone shows liquid phase characteristics,and increasing the temperature inhibits the miscible process;when the temperature is greater than 230℃,the miscible zone tends to show gas phase characteristics,and increasing the temperature is conducive to the miscibility formation.Under a certain pressure,with the increase of temperature,the miscibility of flue gas,nitrogen and crude oil is realized.When the temperature is low,the effect of CO_(2) on promoting miscibility is obvious,and the order of miscible temperature of gas medium and crude oil is N_(2)>flue gas>CO_(2);however,when the temperature is high,the effect of CO_(2) on promoting miscibility gradually decreases,and the miscible temperature of N_(2) and crude oil is close to that of flue gas.The miscibility is dominated by the distillation and volatilization of light components of crude oil.There are many light hydrocarbon components in the gas phase at phase equilibrium,and the miscible zone is characterized by gas phase.

关 键 词：热混相驱 混相规律 混相带 PVT实验 蒸馏相变 最小混相压力 最小混相温度 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]