CAJ | 학술논문

目前气体-原油分子扩散系数的研究对象多为单组分气体-原油体系,而且多在低温或者低压下在PVT筒中进行实验,与实际的注气过程相差较大。在这种情况下,研究了多孔介质中高温高压下多组分气体-原油的扩散系数,测试了全直径岩心中多组分气体-凝析油、多组分气体-重质原油在60℃,20MPa条件下的扩散系数。研究结果表明：原油组分对扩散有一定影响,但对于最终扩散程度影响不大;气体在凝析油中的扩散系数高于其在重质原油中的扩散系数;扩散系数以幂函数形式逐渐增加,最终逐渐趋于平缓。
목전기체-원유분자확산계수적연구대상다위단조분기체-원유체계,이차다재저온혹자저압하재PVT통중진행실험,여실제적주기과정상차교대。재저충정황하,연구료다공개질중고온고압하다조분기체-원유적확산계수,측시료전직경암심중다조분기체-응석유、다조분기체-중질원유재60℃,20MPa조건하적확산계수。연구결과표명：원유조분대확산유일정영향,단대우최종확산정도영향불대;기체재응석유중적확산계수고우기재중질원유중적확산계수;확산계수이멱함수형식축점증가,최종축점추우평완。
The study of molecular diffusion coefficient for gas-oil system focuses mostly on the single gas-oil system,and the diffusion coefficient is measured in the PVT tube under low pressure or low temperature.Under the circumstances,this paper tested the effective diffusion coefficient between the gas injected and oil in porous media under high temperature and pressure,and also tested the diffusion coefficient of gas-condensate oil system and gas-heavy crude oil system in the full diameter core under 60 ℃ and 20 MPa respectively.The results show that the components of crude oil have a little influence on the diffusion coefficient.The gas diffusion coefficient in condensate oil is higher than that in heavy oil.The diffusion coefficient follows a power function and increases with the increasing of time,and the curve flattens gradually finally.