COMPOSITIONAL DEPENDENCE OF WETTING AND CONTACT ANGLES IN SOLID-LIQUID-LIQUID SYSTEMS UNDER REALISTIC ENVIRONMENTS

摘要

The Dual Drop Dual Crystal (DDDC) contact angle measurement technique has been used in this study with a high-pressure high-temperature optical cell apparatus to measure dynamic contact angles in rock-oil-brine systems at realistic reservoir conditions of temperature and pressure.The experimental observations with live,stocktank,de-asphalted and de-resined crude oils indicate that the stability of oil,which determines the precipitation of asphaltenes for wettability alteration,is controlled by the entire oil composition.The ionic interactions caused by the brine composition and surface charged behaviour of rock substrates have been identified as another main mechanism that can affect wetting and contact angles in solid-liquid-liquid systems.