Electrokinetic properties of reservoir rock particles

Schramm, Laurier L.; Mannhardt, K.; Novosad, Jerry J.

doi:10.1016/0166-6622(91)80102-t

Cited by 64 publications

(35 citation statements)

References 30 publications

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“…This difference may be explained by the electrical behavior of the two minerals. For calcite, as reported by several authors [32,33], the surface is positively charged in the presence of water in contrast to that of mica, which bears negative charges. Even if the formation of the surface charge is difficult to evidence in the case of a thin film of water, it is logical to expect that the cal- cite surface will attract negatively charged molecules like the anionic form of the fatty acid whereas mica will repel it.…”

Section: Modified Surfacesmentioning

confidence: 67%

Wettability of calcite and mica modified by different long-chain fatty acids (C18 acids)

Gomari

Denoyel

Hamouda

2006

Journal of Colloid and Interface Science

115

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Section: Modified Surfacesmentioning

confidence: 67%

Wettability of calcite and mica modified by different long-chain fatty acids (C18 acids)

Gomari

Denoyel

Hamouda

2006

Journal of Colloid and Interface Science

115

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“…At the basal surface, however the charge originates from isomorphic substitution of Si 4þ by Al 3þ and the arising negative charges are independent of pH. [18] This means that kaolinite is composed of both pH independent and pH-dependent surface charges. The net charges are reflected in the electrokinetic properties of the particles.…”

Section: Kaolinitementioning

confidence: 99%

“…Reservoir minerals carry electrical charges and the requirement of electro-neutrality of the interfacial region results in the formation of a diffuse layer of oppositely charged counterions in the water adjacent to the particle surface. [18] Under all conditions the net charge density on the solution side (r s ) must be equal in magnitude and opposite in sign to the net charge density r o on the reservoir mineral, r o ¼ -r s . According to the Stern model, the charge r s in the solution is partially stuck to the solid (r b ), and the remainder (r d ) is diffusely spread out in the solution, that is, r s ¼ r b þ r d .…”

Section: Introductionmentioning

confidence: 99%

Surface Characterization of Model, Outcrop, and Reservoir Samples in Low Salinity Aqueous Solutions

Farooq

Tweheyo

Sjöblom

et al. 2011

Journal of Dispersion Science and Technology

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The purpose of this study was to characterize model, outcrop, and reservoir samples under low salinity, different cationic valency, and pH ranges. Potentiometric titrations and zeta potential measurements were performed in order to determine the surface properties at different pH. The extent of ion adsorption on the mineral surfaces was found by the difference between the two approaches. X-ray diffraction and cation exchange capacity measurements were also performed. All samples except calcite showed high, negative zeta potentials in fresh water at pH > 6, followed by NaCl, low salinity solution (LSS), and solutions with divalent cations. The effect of ion valency on the zeta potential at low pH values was not prominent. Above pH 8, H þ and OH À were not potential determining ions for samples that contained calcite and dolomite more than 1.5%. Above pH 8, the presence of carbonates in outcrop and reservoir samples significantly affected the zeta potential by reversing the charge in divalent solutions. The cation exchange capacity of predominant quartz, mixed quartz-clay-carbonate, and quartz-carbonate sandstones was 0.0, 0.2, and 2.2 meqv/100 g, respectively. The compositional differences between the samples were also reflected in the point of zero charge (pzc) values. Samples containing more than 1.5% carbonates had pzc in the range of pH 8-9, while samples with small fractions of carbonates or without carbonates had pzc values in the range of pH 2.9-3.3.

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“…The calculated total interaction potentials for two different sizes of calcite particles (1 and 4 µm) are shown in Figure 5. Schramm et al [20] and Pierre et al [21] reported a value of <5 and 2µm for calcite particle size, respectively.…”

Section: Oil Recovery Sensitivity To Different Temperature Relative Pmentioning

confidence: 99%

Effect of Temperature, Wettability and Relative Permeability on Oil Recovery from Oil-wet Chalk

Hamouda

Karoussi

2008

Energies

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It is customary, for convenience, to use relative permeability data produced at room temperature. This paper shows that this practice underestimates oil recovery rates and ultimate recovery from chalk rocks for high temperature reservoirs. Above a certain temperature (80°C in this work) a reduction of oil recovery was observed. The reduction in oil recovery is reflected by the shift of relative permeability data towards more oil-wet at high temperature (tested here 130°C). However, both IFT and contact angle measurements indicate an increase in water wetness as temperature increases, which contradict the results obtained by relative permeability experiments. This phenomenon may be explained based on the total interaction potential, which basically consists of van der Waals attractive and short-range Born repulsive and double layer electrostatic forces. The fluid/rock interactions is shown to be dominated by the repulsive forces above 80°C, hence increase fine detachment enhancing oil trapping. In other words the indicated oil wetness by relative permeability is misleading.

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Electrokinetic properties of reservoir rock particles

Cited by 64 publications

References 30 publications

Wettability of calcite and mica modified by different long-chain fatty acids (C18 acids)

Wettability of calcite and mica modified by different long-chain fatty acids (C18 acids)

Surface Characterization of Model, Outcrop, and Reservoir Samples in Low Salinity Aqueous Solutions

Effect of Temperature, Wettability and Relative Permeability on Oil Recovery from Oil-wet Chalk

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