Surface energy and wetting behavior of reservoir rocks

Abstract

h i g h l i g h t s• Investigated the surface energy of a reservoir rock using IGC.• Examined the effect of moisture and temperature on their surface energetics.• The surface interaction forces at the rock-fluid interface were quantified.• Proposed a new approach for measuring the wettability index of a rock-fluid system.• Wettability index scales from −1 (strongly oil-wet) to +1 (strongly water-wet). g r a p h i c a l a b s t r a c t a b s t r a c tAn accurate description of the surface chemistry of the reservoir rock-fluid system is essential to understand the attractive forces between the various phases (crudes, brines and the rock surface). These physico-chemical interactions determine the fundamental nature of the reservoir wettability and the wetting behavior of fluids on the reservoir rock surface. Inverse gas chromatography (IGC) is used to characterize the surface chemistry of a Saudi Arabian reservoir rock (henceforth referred to as 'reservoir rock') at different moisture coverage and temperatures. This information combined with the surface tension of the interacting reservoir fluids is utilized to develop a new method for quantifying wettability in terms of a wettability index. This index is based on the relative magnitude of the work of adhesion between the rock surface and the competing oleic/aqueous phase.Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).

Derivation of a pH Dependent Solid-Liquid Interfacial Tension and Theoretical Interpretation of the Physicochemistry of Dewetting in the CO2-Brine-Silica System

“…The basic and acidic surface sites of solids are pH dependent (Bolland et al, 1980). Therefore, the theoretical and fundamental basis of our work are in good agreement with those of Arsalan et al, (2015), that link wettability index and pH and we will proceed to discuss our work in some physically meaningful aspects.…”

“…Consequently, the index of wettability must be equally related to surface energy or interfacial energy between phases. Arsalan et al, (2015), have linked wettability index and surface free energies that integrate basic and acidic surface sites of interfacial energy in accordance with the intermolecular forces effect on surface tension and or interfacial tension (Oss et al, 1988). The basic and acidic surface sites of solids are pH dependent (Bolland et al, 1980).…”

Surface free energy and mechanical performance of LDPE/CBF composites containing toxic-metal free filler

“…The impact strength of a composite is influenced by many factors, including the toughness of the reinforcement, matrix fracture, the nature of the filler-matrix interfacial region, and frictional work involved in pulling out the filler from the matrix [35,36]. Among these, the nature of the interfacial region is significant and directly related to the toughness of the composite.…”

Energy Analysis and Experiment of Breaking Cobalt-Rich Crust

“…Khazaei et al (2015) had studied the energies of acoustic emission of intact rock during uniaxial compression test and discrete element modeling. Arsalan et al (2015) had researched the surface energy and wetting behavior of reservoir rocks. Jaime et al (2015) had proposed a finite element model of rock cutting and analyzed the energy during fragmentation process.…”