MD膜驱剂和单季铵盐对界面Zeta电位的影响

MD膜驱油技术是一种新型提高原油采收率技术。为对比MD膜驱剂(单分子双季铵盐)和几种单季铵盐在界面作用中的差别,运用微电泳法分别考察了这些化合物与高岭土/水和沥青质对二甲苯溶液/水的界面作用。结果表明,Zeta电位能够反映出MD膜驱剂与单季铵盐在界面的静电作用及范德华力作用的差别。MD膜驱剂和单季铵盐与沥青质对二甲苯溶液/水界面的作用比与高岭土/水界面的作用大;范德华力在单季铵盐与沥青质对二甲苯溶液/水界面作用中的比重比在单季铵盐与高岭土/水界面作用中的比重大。MD膜驱剂和单季铵盐与两界面的作用大小顺序为:MD膜驱剂 四丁基溴化铵>四乙基溴化铵和四甲基溴化铵。MD膜驱剂与单季铵盐的不同主要在于其电荷量大,单季铵盐之间的不同则在于与界面的范德华力不同。

EFFECTS OF MOLECULAR DEPOSITION FILMING LOODING AGENT AND MONO-QUATERNARIES ON INTERFACIAL ZETA POTENTIALS

Molecular deposition filming flooding(MDFF) is a novel oil recovery technique. To investigate the differences between molecular deposition filming flooding agent and mono-quaternaries in interfacial interactions, microelectrophoresis method was applied in studying the electrostatic behavior of kaolinite/waterand aspaltene p-xylene solution/water interfacial action. Results show that the Zeta potential can reflect differences between molecular deposition filming flooding agent and mono-quaternaries in interfacial electrostatic interaction and Vander Waals force interaction. The interaction of quaternaries and asphaltene pxylene solution/water interface is larger than that of quaternaries and kaolinite/water interface. The Vander Waals force playsmore important role in interaction of quaternaries and asphaltene p-xylene solution/water interface than that of quaternaries and Kaolinte/water interface. The interfacial interaction has such a sequence as follows: MDFF agent>tetramethylammonium bromide > tetraethylammonium bromide > tetrabutylammonium bromide. MDFF agent differs from mono-quaternaries mainly because of its larger charge amount, while mono-quaternariesdiffer from each other because of the Vander Waals force between each species and interfaces.