The Gas–Oil Interfacial Behavior during Gas Injection into an Asphaltenic Oil Reservoir
The Gas–Oil Interfacial Behavior during Gas Injection into an Asphaltenic Oil Reservoir
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DOI：
10.1021/je400403y
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发表时间：
2013-08
影响因子：
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通讯作者：
M. Escrochi;N. Mehranbod;S. Ayatollahi
中科院分区：
文献类型：
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作者：
M. Escrochi;N. Mehranbod;S. Ayatollahi
注气驱油过程中驱油效率取决于驱动力与毛细管阻力之间的竞争，而毛细管阻力受气-油界面行为的控制。详细研究注气过程中的界面力是这项研究工作的主要目标。通过综合实验研究，确定了注入气体组成的影响及在较宽压力范围内沥青质沉淀的可能性。这是通过测量高沥青质伊朗原油在三种周围气体介质中的界面张力来进行的。结果表明，随着压力的增加，在沥青质沉淀开始附近，达到可溶解性的速率降低。当沥青质在油气界面上的表面覆盖度超过一个阈值时，反应速率进一步降低。组分抽提、不凝气膜形成、沥青质沉淀和沥青质在界面处的聚集是导致沥青质运移的主要原因。
Oil displacement and recovery efficiency during gas injection depends on the competition between driving forces and capillary resistance that is governed by gas–oil interfacial behavior. Detailed study of the interfacial forces during gas injection is the main objective of this research work. The effects of injecting gas composition and the possibility of asphaltene precipitation in a wide pressure range were determined through comprehensive experimental study. This was performed by measurement of interfacial tension of a highly asphaltenic Iranian crude oil in three surrounding gas mediums. The results showed that as pressure increases, the rate to reach miscibility reduces in the vicinity of the asphaltene precipitation onset. As the surface coverage of the asphaltene at the gas–oil interface exceeded a threshold value the rate was reduced furthermore. Component extractions, noncondensable gas film formation, asphaltene precipitation, and asphaltene accumulation at the interface are found to be the main...