The wettability of oil reservoirs is the most important factor controlling the rate of oil recovery, providing a profound effect on petroleum production. The petroleum industry has increased the research effort on wettability, but, so far, there has never been a comprehensive book on the topic. This is the first book to go through all of the major research and applications on wettability, capillary pressure and improved recovery. Critical topics including core preservation, the effect of wettability on relative permeability, surface forces such as van der Waals equation of state, petroleum traps and pore size effects are all included in this musthave handbook. Deciphering the techniques and examples will increase the efficiency and production of oil recovery, translating to stronger reservoir simulations and improved well production.

Table of Contents

Preface Nomenclature About the Authors 1 Wettability The Four States of Wettability Water-Wet System Fractionally-Wet Mixed-Wet Oil-Wet Interfacial Tension Contact Angle Advancing and Receding Contact Angles Core Preservation Capillary Pressure Amott Wettability Index Combined Amott-USBM Wettability Test Spontaneous Imbibition Oil Recovery by Imbibition Spreading Effect of Wettability on Relative Permeability Effect of Wettability on Waterfloods Procedures Production Curves Effects of Viscosity Effects of Wettability on Electrical Properties Dispersion and Wettability Introduction Applications Theory Influence of Wettability Example Problems 2 Surface Forces Introduction Van der Waals Equation of State Electrostatic Interactive Energies Dielectric Media Principle Interactive Forces Short-Range Forces London Dispersion Forces Dipole Forces Keesom Dipole-Dipole Forces Debye-Induced Dipole Interactions Van der Waals Forces Zeta Potential and the Electric Double Layer Interaction DLVO (Derjaguin, Landau, Verwey, and Overbeek) Theory Hamaker Constant Disjoining Pressure Electrostatic Forces Poisson-Boltzman Equation Counterion Density with Respect to Distance (Diffuse Double Layer) Osmotic Repulsion Pressure Hydration Forces Disjoining Pressure and the Canonical Potential Hydrogen Bonding Summary of Interactive Forces Lewis Acid/Base Reactions Solvent Behavior Solid Surface Interactions with Solutions Clay Swelling and Particle Movement Crude Oil/Solid Surface Interactions Example Problems 3 Wettability and Production


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Gulf Publishing Company
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About the authors

Erle Donaldson

Erle C. Donaldson is an independent consultant and managing editor of the Journal of Petroleum Science and Engineering. He was elected to the International Hall of Fame for Science in 1993. He has received a distinguished service award from the Republic of Honduras and other honors from the U.S. Department of Energy, the National Petroleum Engineering Honor Society, and the University of Oklahoma. Dr. Donaldson has written, co-authored, and served as editor on numerous articles and books.

Affiliations and Expertise

Professor Emeritus, University of Oklahoma, Norman, Oklahoma, USA