Experimental Study of Wettability of Reservoir Rocks at High Pressure and Temperature

摘要

This work is divided into two main parts: (1) An investigation of the effect pressure, temperature and oil composition on interfacial properties of a specific reservoir system, and (2) The development of an advanced high pressure equipment for wettability measurements. Contact angle measurements are used to quantify wettability. Interfucial tension between oil and water is measured and the degree of rigid film formation is quantified. A complete reversal of wettability from a predominantly oil-wet system at lower temperatures to a predominantly water-wet system at higher temperatures is found. Furthermore, the temperature strongly influences interfacial tension and rigid film formation. An improved high pressure apparatus for measuring interfacial properties has been constructed and successfully tested. 90 references. (ERA citation 12:007926)