关键词: 提高采收率, 聚并, 破乳, 铺展膜, 数学模型, 复合驱

Abstract: During demulsification of produced fluids in combination flooding,some microphenomena are observed and researched.Oil droplets buoyed up in the aqueous phase and distorted to form oil films on the aqueous surfaces in the demulsification processes.Then,coalescence of oil films occurred quickly.This is due to the variation of the surface tension which make them spread to oil films with a stable ratio. Theoretical derivations and experimental data prove that the spreading happened in a stationary ratio which is constant related only the property of the system.The radium of oil films varies upon coalescence.The rule of the variation is the same as coalescence of global oil droplets.This can be easily explained by the natural derivation that oil droplets spread into oil films in proportion.The phenomena are observed universally in the systems in which rapid and complete demulsification take place.The mathematical model is suggested and experiments have been verified.

Key words: enhanced oil recovery, coalescence, demulsification, spreading film, mathematical model, combination flooding