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

作　　者：XI Changfeng ZHAO Fang WANG Bojun LIU Tong QI Zongyao LIU Peng 

机构地区：[1]State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China [2]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China

出　　处：《Petroleum Exploration and Development》2024年第6期1556-1563,共8页石油勘探与开发(英文版)

基　　金：Supported by the Petro China Science and Technology Project(2023ZG18)。

摘　　要：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：thermal miscible flooding miscible rules miscible zone PVT experiment distillation phase transition minimum miscible pressure minimum miscible temperature 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]