Mechanisms for contact angle hysteresis and advancing contact angles

Yang, Shengyu; Hirasaki, George J.; Basu, Subhayu; Vaidya, Ravimadhav

doi:10.1016/s0920-4105(99)00049-2

Cited by 77 publications

(60 citation statements)

References 12 publications

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“…Contact angles have been used to characterize interactions with known compounds including adsorption of organic acids on calcite [41,42] and an organic base on quartz [43].…”

Section: Adsorption Of Crude Oil Componentsmentioning

confidence: 99%

“…Mechanisms of adsorption include acid/base interactions, ion binding, and surface precipitation of crude oils [39,40]. Hysteresis is commonly observed, and has been ascribed, on the basis of atomic force microscopy, to heterogeneity with respect to surface coverage by adsorption [41]. For paraffinic crude oils with low asphaltene content, and correspondingly low acid and base numbers, hysteresis decreased with respect to successive cycles of measurement; contact angles measured after adsorption from asphaltic crude oils were distinctly more stable [42].…”

Section: Contact Angles After Adsorption From Crude Oilmentioning

confidence: 99%

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Wettability and Imbibition: Microscopic Distribution of Wetting and Its Consequences at the Core and Field Scales

Buckley¹,

Morrow²,

Palmer³

et al. 2003

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The main objectives of this project are:(1) to quantify the microscopic distribution of altered wetting that occurs in oil reservoirs as crude oil components adsorb on rock surfaces, and (2) to apply quantitative descriptions of wetting at the microscopic level to interpretation of imbibition in mixed-wet porous media. AbstractThe questions of reservoir wettability have been approached in this project from three directions. First, we have studied the properties of crude oils that contribute to wetting alteration in a reservoir. A database of more than 150 different crude oil samples has been established to facilitate examination of the relationships between crude oil chemical and physical properties and their influence on reservoir wetting. In the course of this work an improved SARA analysis technique was developed and major advances were made in understanding asphaltene stability including development of a thermodynamic Asphaltene Solubility Model (ASM) and empirical methods for predicting the onset of instability. The CO-Wet database is a resource that will be used to guide wettability research in the future.The second approach is to study crude oil/brine/rock interactions on smooth surfaces. Contact angle measurements were made under controlled conditions on mica surfaces that had been exposed to many of the oils in the CO-Wet database. With this wealth of data, statistical tests can now be used to examine the relationships between crude oil properties and the tendencies of those oils to alter wetting. Traditionally, contact angles have been used as the primary wetting assessment tool on smooth surfaces. A new technique has been developed using an atomic forces microscope that adds a new dimension to our ability to characterize oil-treated surfaces.Ultimately we aim to understand wetting in porous media, the focus of the third approach taken in this project. Using oils from the CO-Wet database, experimental advances have been made in scaling the rate of imbibition, a sensitive measure of core wetting. Application of the scaling group to mixed-wet systems has been demonstrated for a range of core conditions. Investigations of imbibition in gas/liquid systems provided the motivation for theoretical advances as well.As a result of this project we have many new tools for studying wetting at microscopic and macroscopic scales and a library of well-characterized fluids for use in studies of crude oil/brine/rock interactions.iv Table of , where v p is precipitant molar volume. Fits to these linear trends are summarized in Table I relationship used is that for A-93+ α-MN (Fig. I-3.5) with a temperature adjustment of -0.0008 RI units/°C. Solution gas is estimated to be xiii composed of methane, ethane, and propane with mole fractions of 0.5, 0.4, and 0. Figure I-3.27. Measured and predicted onset conditions for flocculation from crude oils induced by precipitants from n-pentane to n-pentadecane. Asphaltene molar volume = 2500 ml/mol. Other model parameters are given in Figure II-2.8. Example of the "memo...

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“…Contact angles have been used to characterize interactions with known compounds including adsorption of organic acids on calcite [41,42] and an organic base on quartz [43].…”

Section: Adsorption Of Crude Oil Componentsmentioning

confidence: 99%

Section: Contact Angles After Adsorption From Crude Oilmentioning

confidence: 99%

Wettability and Imbibition: Microscopic Distribution of Wetting and Its Consequences at the Core and Field Scales

Buckley¹,

Morrow²,

Palmer³

et al. 2003

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“…Several researchers have attempted to define the controls on wettability and explain its role in oil recovery (4,8,12). Studies have tried to link micrometer-scale contact angle measurements from pure calcite, silicon, or mica substrates with atomic force microscopy (AFM) (8,10,11,13,14). To simulate reservoir conditions, mica surfaces have been aged by exposure to various crude oil components before contact angle experiments.…”

mentioning

confidence: 99%

Probing the intrinsically oil-wet surfaces of pores in North Sea chalk at subpore resolution

Hassenkam

Skovbjerg

Stipp

2009

Proc. Natl. Acad. Sci. U.S.A.

134

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Pore surface properties control oil recovery. This is especially true for chalk reservoirs, where pores are particularly small. Wettability, the tendency for a surface to cover itself with fluid, is traditionally defined by the angle a droplet makes with a surface, but this macroscopic definition is meaningless when the particles are smaller than even the smallest droplet. Understanding surface wetting, at the pore scale, will provide clues for more effective oil recovery. We used a special mode of atomic force microscopy and a hydrophobic tip to collect matrices of 10,000 force curves over 5-؋ 5-m 2 areas on internal pore surfaces and constructed maps of topography, adhesion, and elasticity. We investigated chalk samples from a water-bearing formation in the Danish North Sea oil fields that had never seen oil. Wettability and elasticity were inhomogeneous over scales of 10s of nanometers, smaller than individual chalk particles. Some areas were soft and hydrophobic, whereas others showed no correlation between hardness and adhesion. We conclude that the macroscopic parameter, ''wetting,'' averages the nanoscopic behavior along fluid pathways, and ''mixed-wet'' samples have patches with vastly different properties. Development of reservoir hydrophobicity has been attributed to infiltrating oil, but these new results prove that wettability and elasticity are inherent properties of chalk. Their variability, even on single particles, must result from material originally present during sedimentation or material sorbed from the pore fluid some time later.AFM ͉ force maps ͉ wettability ͉ oil recovery ͉ adhesion

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“…In the most common macroscopic test method [53,54,[57][58][59][60][61][62], a captive oil drop is contacted with the substrate for a short time and then retracted. The overall interaction is judged as adhesive or nonadhesive if oil remains in contact or is cleanly removed.…”

Section: Importance Of Colloidal Interactions To Oil Recoverymentioning

confidence: 99%

Consequences of shifted ion adsorption equilibria due to nonelectrostatic interaction potentials in electrical double layers

Deniz

Fogden

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Mechanisms for contact angle hysteresis and advancing contact angles

Cited by 77 publications

References 12 publications

Wettability and Imbibition: Microscopic Distribution of Wetting and Its Consequences at the Core and Field Scales

Wettability and Imbibition: Microscopic Distribution of Wetting and Its Consequences at the Core and Field Scales

Probing the intrinsically oil-wet surfaces of pores in North Sea chalk at subpore resolution

Consequences of shifted ion adsorption equilibria due to nonelectrostatic interaction potentials in electrical double layers

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