COLL 51 |
| Dandina N. Rao, The Craft and Hawkins Department of Petroleum Engineering, The Craft and Hawkins Department of Petroleum Engineering, Louisiana State University, 3516 CEBA Building, Nicholson Extension, Baton Rouge, LA 70803-6417 |
| While significant strides have been made in understanding the contact angle behavior in solid-liquid-vapor (s-l-v) systems, the same cannot be said about the solid-liquid-liquid (s-l-l) systems. This is largely due to the fact that the commonly used techniques of shifting the three-phase contact line in s-l-v systems have not worked well in s-l-l systems such as those encountered in petroleum reservoirs. These reservoirs involve interfacial interactions of spreading, adhesion and dynamic contact angles between the reservoir rock surface, the crude oil and the brine. Each of these components is complex in the sense that the rock surface is not only rough but of varying mineralogical composition, the crude oil is a complex mixture of thousands of organic molecules and the brine contains varying amounts of dissolved mono- and multi-valent inorganic salts. Furthermore, these reservoirs exist at varying depths and consequently exhibit elevated pressures and temperatures. How can we measure interfacial interactions in such complex systems at demanding conditions? This presentation attempts to clarify some conceptual misunderstandings in addition to describing a recently developed dual-drop dual-crystal (DDDC) technique for reproducibly measuring water-advancing and receding contact angles at reservoir conditions. Some recent measurements, using this technique, of dynamic contact angles on different rock surfaces of varying mineralogical composition and roughness will be discussed along with their practical implications. |
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Symposium in Memory of Arthur W. Adamson
2:00 PM-5:40 PM, Sunday, March 28, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |