Carbon Dioxide/Brine, Nitrogen/Brine, and Oil/Brine Wettability of Montmorillonite, Illite, and Kaolinite at Elevated Pressure and Temperature

Fauziah, Cut Aja; Al-Yaseri, Ahmed; Beloborodov, Roman; Siddiqui, Mohammed Abdul Qadeer; Lebedev, Maxim; Parsons, Drew F.; Roshan, Hamid; Barifcani, Ahmed; Iglauer, Stefan

doi:10.1021/acs.energyfuels.8b02845

Cited by 67 publications

(37 citation statements)

References 72 publications

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“… 40 Under reservoir conditions, illite and kaolinite were reported to be hydrophilic in previous research studies. 41 However, the result of molecular dynamic simulation suggested that kaolinite was hydrophobic. 42 Pan et al also found that the presence of kaolinite made the contact angles of brine on the quartz increase in CH 4 and CO 2 environments at low temperature.…”

Section: Results and Discussionmentioning

confidence: 99%

Experimental Study of the Wettability Characteristic of Thermally Treated Shale

Yang

Gu²,

Chen

et al. 2020

ACS Omega

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Extraction of shale gas from shale reservoirs is significantly affected by shale wettability. Recently, thermal recovery technologies (e.g., combustion) have been tested for shale gas recovery. This requires an understanding of the wettability change mechanism for thermally treated shale samples. In this study, the effect of combustion on shale wettability was investigated. Shale samples were first processed to obtain smooth surfaces and then combusted at temperatures of 200, 400, and 800 °C. The initial contact angles and dynamic behavior of water droplets on shale surfaces were recorded using the sessile drop method. It was found that pores and fractures were generated on the shale surfaces following high-temperature combustion. The pore volume and diameter increased with increasing combustion temperature, which improved the connectivity of hydrophilic pore networks. Compared to a raw shale sample, the shale sample combusted at 400 °C showed a smaller initial water contact angle and a more rapid decrease in the contact angle because of the oxidation of organic matter and generation of pore structures. Water droplets were found to completely spread over the surface of the shale sample combusted at 800 °C because of the generation of fractures. Moreover, the van der Waals potential between water droplets and combusted shale samples was determined to be stronger. However, the initial contact angle and dynamic behavior of water droplets did not show a significant change for the shale sample combusted at 200 °C. As a result, high-temperature combustion (≥400 °C) can be used to significantly improve the hydrophilicity of shale.

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Section: Results and Discussionmentioning

confidence: 99%

Experimental Study of the Wettability Characteristic of Thermally Treated Shale

Yang

Gu²,

Chen

et al. 2020

ACS Omega

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“…The compacted cylindrical samples (diameter of 3.8 cm and length of 1 cm) were removed from the cell after one week and then dried in an oven (50°C) for 48 h. All samples were compacted to the same porosity level of 15% and the grain size of montmorillonite, illite and kaolinite was about 75 μm. 27 The particle size of individual clay grain is generally < 2 or < 4 μm. [47][48][49] The compaction apparatus used is illustrated in Figure 1 and details of the samples are provided in Table 1.…”

Section: Methodology Sample Preparationmentioning

confidence: 99%

“…The detailed experimental setup has been described previously. 27,[54][55][56][57][58][59] Synthetic brine of 20 wt% NaCl and 1 wt% KCl, with mass fraction purities ≥0.99; see Table 1, in deionised water, was used in these measurements. The substrate was inserted inside the cell at a set temperature (333 K).…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

“…[24][25][26] Some studies have endeavoured to measure clay wettability through contact angle measurements and researchers have observed several inconsistencies. These studies observed CO 2 contact angles on pure clays (montmorillonite, illite and kaolinite), 27 where the results show that montmorillonite is strongly oil-wet, while illite and kaolinite are water-wet. Other studies on muscovite (mica) substrates [28][29][30] show that the water contact angle increased with increasing pressure and salinity and decreased with increasing temperature.…”

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confidence: 97%

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Dependence of clay wettability on gas density

et al. 2021

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Understanding wettability of clay minerals is crucial in assessing primary migration of hydrocarbon and evaluating CO 2 storage capacities and containment security. In spite of recent efforts, there is considerable uncertainty of experimental data and theoretical predictions are lacking. We, therefore, developed new correlations to predict the advancing and receding contact angles of three different clay minerals (i.e., montmorillonite, Illite and kaolinite) as a function of gas density. To do so, we first measured clay minerals advancing and receding contact angles for helium, nitrogen, argon and carbon dioxide/brine systems at various pressures (5, 10, 15 and 20 MPa) and a constant temperature of 333 K. The statistical analysis shows that the developed correlations are capable of predicting the contact angles of the three clay minerals with very high accuracy (i.e., R > 0.95, for all the newly developed correlations). We thus conclude that the wettability of these clay minerals can be computed from knowledge of the gas densities, using these new empirical correlations. This work has important implications for improving wettability predictions, and thus reducing risks related to subsurface operations, such as CO 2 storage or hydrocarbon recovery.

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“…The findings showed that the highest adsorption was observed with the 50–50 blend, and the adsorption behavior was best represented by the Langmuir isotherm. Fauziah et al [ 8 ] reported the effect of CO 2 , brine, oil, and nitrogen on the wettability of montmorillonite, illite, and kaolinite at elevated pressures. The findings showed that in the presence of CO 2 , montmorillonite had the highest water contact angle followed by illite and then kaolinite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Native Reservoir State and Oilfield Operations on Clay Mineral Surface Chemistry

et al. 2022

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An understanding of clay mineral surface chemistry is becoming critical as deeper levels of control of reservoir rock wettability via fluid–solid interactions are sought. Reservoir rock is composed of many minerals that contact the crude oil and control the wetting state of the rock. Clay minerals are one of the minerals present in reservoir rock, with a high surface area and cation exchange capacity. This is a first-of-its-kind study that presents zeta potential measurements and insights into the surface charge development process of clay minerals (chlorite, illite, kaolinite, and montmorillonite) in a native reservoir environment. Presented in this study as well is the effect of fluid salinity, composition, and oilfield operations on clay mineral surface charge development. Experimental results show that the surface charge of clay minerals is controlled by electrostatic and electrophilic interactions as well as the electrical double layer. Results from this study showed that clay minerals are negatively charged in formation brines as well as in deionized water, except in the case of chlorite, which is positively charged in formation water. In addition, a negative surface charge results from oilfield operations, except for operations at a high alkaline pH range of 10–13. Furthermore, a reduction in the concentrations of Na, Mg, Ca, and bicarbonate ions does not reverse the surface charge of the clay minerals; however, an increase in sulfate ion concentration does. Established in this study as well, is a good correlation between the zeta potential value of the clay minerals and contact angle, as an increase in fluid salinity results in a reduction of the negative charge magnitude and an increase in contact angle from 63 to 102 degree in the case of chlorite. Lastly, findings from this study provide vital information that would enhance the understanding of the role of clay minerals in the improvement of oil recovery.

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Carbon Dioxide/Brine, Nitrogen/Brine, and Oil/Brine Wettability of Montmorillonite, Illite, and Kaolinite at Elevated Pressure and Temperature

Cited by 67 publications

References 72 publications

Experimental Study of the Wettability Characteristic of Thermally Treated Shale

Experimental Study of the Wettability Characteristic of Thermally Treated Shale

Dependence of clay wettability on gas density

Effect of Native Reservoir State and Oilfield Operations on Clay Mineral Surface Chemistry

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