Mouillabilité et réservoirs pétroliers

Cuiec, L.

doi:10.2516/ogst:1986029

Cited by 10 publications

(6 citation statements)

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“…This method can only compare the extractable fraction of asphaltenes, and its underestimation of the true amount may vary with carbonate and oil types. 5,10 Samples without spontaneous imbibition will first be discussed. The amounts in Table 5 are always higher for WP oil than for CW under the same conditions.…”

Section: Energy and Fuelsmentioning

confidence: 99%

“…At these locations, adsorption or deposition of the oil’s more polar components, namely asphaltenes and resins, alters the local surface chemistry to more oil-wetting . Laboratory core analysis often attempts to restore the native reservoir state by first cleaning the rock to its original water-wetness (which is especially difficult for carbonates , ) and then performing primary drainage of formation brine by crude oil to a relevant initial saturation, followed by aging. Core-scale quantification of wettability can be obtained from brine imbibition and oil secondary drainage tests, for example, the Amott-Harvey or USBM indexes .…”

Section: Introductionmentioning

confidence: 99%

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Pore-Scale Distribution of Crude Oil Wettability in Carbonate Rocks

2012

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Carbonate reservoir rocks can exhibit highly variable and intricate pore systems at multiple scales, for which the distribution of wettability is largely unknown. To improve understanding of pore-scale wettability, a set of outcrop and reservoir carbonate plugs was treated by partial drainage of brine by crude oil and aging, for a variety of brine–oil combinations and conditions. Wettability alteration was imaged by high resolution scanning electron microscopy of the oil footprint remaining on internal rock surfaces after removal of oil and brine with mild solvents. The wettability distribution on the calcite microparticles, which comprised microporous regions and lined vugular macropores, showed a characteristic, but unconventional, mixed-wet pattern of distinct, coexisting oil-wet and water-wet subareas. Oil deposition was limited to the less crystalline (anhedral) faces of these particles, while neighboring crystalline (euhedral) facets remained water-wet. Supporting measurements of ζ-potential, contact angle, and initial brine saturation demonstrated that this face-selective alteration was formed by spontaneous drainage during aging, which appeared to favor oil deposition on facet edges and surrounding anhedral faces, thus preventing brine drainage from euhedral facets. This unifying pattern may simplify the integration of realistic wettability distributions into pore models of carbonate cores to predict oil recovery. Spontaneous imbibition of brine was sometimes observed to cause retraction of oil deposits on anhedral faces. The visualization of such changes can aid in designing the ionic composition of the flood brine to induce a shift toward water-wetting and enhance recovery from carbonates.

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Section: Energy and Fuelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pore-Scale Distribution of Crude Oil Wettability in Carbonate Rocks

2012

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“…For these purposes, the knowledge of interfacial phenomena is very important; nonetheless, they are very complex because they depend on the chemical composition of oil, the physical and chemical properties of the surfaces, and the heterogeneity of the minerals. When a rock is fully covered with crude oil, which is immiscible with water, the process of water penetration in the rock, named displacement, depends on pore size and the affinity of water and oil to the porous rocks saturated with crude oil. − The interactions of the chemical components of crude oil with the surface of the rocks have been investigated by means of calorimetric techniques measuring the immersion enthalpy of organic molecules on several mineral surfaces. , …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Molecules onto (101̅4) Dolomite Surface: An Application of Computational Studies for Microcalorimetry

et al. 2013

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Dolomite (CaMg(CO 3 ) 2 ) is a sedimentary mineral that is found in the majority of natural carbonate rocks. Dolomite has been used in the treatment of polluting agents, and as a potential adsorbent of CO 2 . Dolomite is usually associated with oil deposits. Secondary oil recovery is a problem related to the adsorption processes of hydrocarbons onto rocks covering the rock surface as a film. The aim of the present study is to investigate the adsorption processes of water and several organic molecules (hexane, cyclohexane, cyclohexene, and benzene) onto the most stable (101̅ 4) dolomite surface by means of Density Functional Theory (DFT) calculations for microcalorimetry applications. One molecule was adsorbed per surface, and different adsorption configurations were explored. Adsorption energy (AE) of water was 16.27 kcal/mol, whereas the AE of the different organic compounds investigated ranged between 3.14 and 5.00 kcal/mol, being much lower than water due to the lack of H bonding and electrostatic interactions that are present in the adsorption of water. Surface tension (σ) was calculated in all adsorption complexes. The difference of σ between the pristine surface and the adsorption complexes was correlated with the experimental enthalpy of immersion, finding a good agreement.

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“…For rock/oil/brine systems, it is a measure of the affinity that the rock has for either oil or water. Cuiec (1986) proved the existence of water-wet, mixed-wet or oil-wet rocks. Sandstones that are reservoir rocks are usually formed of quartz grains attached by clay minerals and hydroxides.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water on the Retention of Organic Probes on Clays Studied by IGC

Balard

1997

Clays and clay miner.

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Abstract--Oil recovery is strongly related to the wettability of reservoir rocks that are formed of quartz grains attached by mineral hydroxides and clay minerals. Illites and kaolinites are the most active due to their high specific surface areas and electrical charge densities. Therefore, these minerals' relative affinities for oil or water when in contact with a water-oil mix are of great importance. In order to model such a complex system, we used a mix of organic model molecules of the oil constituents and water vapor. Their interactions were estimated by inverse gas chromatography (IGC). IGC experiments were performed using a carrier gas with controlled humidity. By means of IGC at infinite dilution conditions, the dispersive component of the surface energy, ~/~, was determined. A strong decrease of .yd, due to water molecules shielding the highest-energy sites, was observed. The energetic surface heterogeneity of the clays was examined using IGC at finite concentration conditions, allowing the determination of organic probe adsorption isotherms in the presence of water. From these isotherms, adsorption energy distribution functions were computed for propanol-2 and pyridine probes. Water mainly modifies the illite distribution functions, whereas practically no change was observed in the case of kaolinite. This observation is related to the higher hydrophilicity of illite as compared with kaolinite, and explains the different behaviors of the 2 clay families in oil reservoirs.

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Mouillabilité et réservoirs pétroliers

Cited by 10 publications

References 0 publications

Pore-Scale Distribution of Crude Oil Wettability in Carbonate Rocks

Pore-Scale Distribution of Crude Oil Wettability in Carbonate Rocks

Adsorption of Molecules onto (101̅4) Dolomite Surface: An Application of Computational Studies for Microcalorimetry

Influence of Water on the Retention of Organic Probes on Clays Studied by IGC

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