非凝析气在原油及其孔隙中溶解的分子模拟
Molecular Simulation of Dissolution of Non-condensate Gas in Oil and Oil Pores
何海峰 1贺文媛 2盖平原 2梁伟 2郭省学 2顾泽凯 3巩亮3
作者信息
- 1. 中国石化胜利油田孤东采油厂,东营 257000
- 2. 中国石化胜利油田石油工程技术研究院,东营 257000;山东省稠油开采技术重点实验室,东营 257000
- 3. 中国石油大学(华东)新能源学院,青岛 266580
- 折叠
摘要
随着石油的不断开采,轻质原油储量不断减少,分子量及黏度较大的原油逐渐成为开采的主要对象.本文构建了不同原油孔隙(C6、原油),采用分子动力学方法,探究了非凝析气体(N2、CO2及混合气体)在原油及其孔隙中的溶解微观过程,揭示了非凝析气体在不同原油及其孔隙中的溶解机理,并探究了温度压力的影响.结果表明,大分子沥青质、胶质对气体的溶解具有明显抑制,CO2和N2气体对稠油中轻组分存在萃取作用.同时CO2在原油孔隙中的溶解能力、对壁面处原油的剥离能力强于N2,N2易在孔隙中部形成气体通道.另外,提升温度和压力均能提升气体对原油溶胀及孔隙中原油推动效果.
Abstract
With the continuous exploitation of oil,the reserves of light crude oil are decreasing,and the crude oil with high molecular weight and viscosity has become the main object of exploitation.In this paper,different crude oil,such as C6 and mixed heavy oil,are constructed,and the molecular dynamics method is used to explore the microscopic process of dissolution of non-condensable gases(N2,CO2 and mixed gas)in crude oil pores.The dissolution mechanism of non-condensate gases in different crude oil and nanoscale pores is revealed,and the effect of temperature and pressure is explored.The results demonstrate that with the addition of macromolecular asphaltene and resin,the dissolution process of gas is inhibited,and the light components of heavy oil could be extracted by gas.The solubility of CO2 in crude oil and the peeling ability of crude oil on the wall are stronger than that of N2.And N2 forms a gas channel in the middle of the pore.In addition,increasing temperature and pressure can improve the effect of gas on crude oil swelling and crude oil propulsion in pores.
关键词
非凝析气/原油孔隙/分子动力学模拟/溶解Key words
Non-condensate gas/pore of crude oil/molecular dynamics simulation/Dissolution引用本文复制引用
基金项目
国家自然科学基金联合基金项目(U20B6003)
出版年
2024
NETL
NSTL
万方数据