Gas Injection Dynamics and Hydrogen Storage in Carbonate Reservoirs: Core-Flooding and Molecular Simulation Study

Energy & Fuels, Год журнала: 2024, Номер unknown

Опубликована: Окт. 17, 2024

Язык: Английский

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Quantification of Rock’s Wettability Index Using Dielectric Measurements

SPE Journal, Год журнала: 2025, Номер unknown, С. 1 - 20

Опубликована: Янв. 1, 2025

Summary Wettability is a crucial parameter that governs several petrophysical attributes of oil- and gas-bearing rocks. However, the traditional methods to measure wettability index are restricted laboratory techniques, which makes measurement expensive time-consuming. Due its sensitivity fluid-solid interaction large contrast between dielectric constant oil water, earlier studies investigated use measurements for evaluation. Nevertheless, these mainly focused on qualitative assessment using did not yield practical easy-to-implement dielectric-based correlation. Therefore, objective this study explore response dispersion changes at two water saturation endpoints, full (Sw=1) irreducible (Swirr), develop correlation obtaining from measurements. A pair (master sister) Berea sandstone (BS) Fontainebleau (FB) Indiana limestone (IL) samples were used in study. The sister was altered (to make them less water-wet) without impacting porosity before measuring their index. widely recognized US Bureau Mines (USBM) (WIUSBM) served as benchmark evaluating newly developed (WIdielectric). Among all measured parameters, imaginary permittivity showed most consistent conclusive results, displaying (at frequencies below 200 MHz) significant drop due altering toward more oil-wet. This can be attributed reduced electrical interactions grain surface alteration. strong linear relationship also observed each sample changed Sw=1 Swirr. WIdielectric by incorporating both able predict WIUSBM tested with R2 0.97 root mean square error 0.066. Overall, offers an in-depth analysis various conditions across different levels, has facilitated formulation equation determining through findings research lay groundwork broadening application additional analyses accurate characterization fluid-rock fluid-fluid interactions.

Язык: Английский

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Impacts of Temperature and Surfactant on Wettability in Mineral–Oil–Water Systems

ACS Omega, Год журнала: 2025, Номер 10(4), С. 3418 - 3426

Опубликована: Янв. 22, 2025

Mineral wettability is a crucial factor that determines the distribution of oil and water at pore scale and, thus, influences reserves recovery efficiency reservoir scale. Adding surfactants one most common methods used to modify mineral wettability. However, previous studies on modifying via were mainly performed under room-temperature conditions, which do not represent high-temperature conditions. A systematic investigation effects temperature surfactant in mineral–oil–water systems still lacking. Therefore, this study, impact (25 °C vs 50 °C), type (cetyltrimethylammonium bromide [CTAB] sodium dodecyl sulfate [SDS]), concentration (0–0.2 wt %) three representative minerals (including quartz, mica, calcite) was systematically investigated contact angle (θ) measurements an environment. It demonstrated as increased, presence CTAB (0.024 %), quartz mica became more oil-wet, while calcite water-wet. In SDS (0.2 At °C, with increased concentration, oil-wet then for they become strongly (quartz: 140°; mica: 163°) specified (0.006 remained water-wet 34° ∼ 60°; 33° 50°) all systems. This work provides fundamental understanding modification various thus aiding efficient extraction geological reservoirs.

Язык: Английский

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Light-Induced Electronic Band Realignment at the Metal Halide Perovskite/Monolayer MoS₂ Heterojunction

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Май 12, 2025

van der Waals (vdW) heterojunctions offer many routes for advanced interface engineering toward superior optoelectronic functionality. To this end, the combination of 2D transition metal dichalcogenides (TMDCs) with halide perovskites has shown great potential applications in photovoltaics and photodetectors. The electronic energy level alignment at such heterojunctions, i.e., relative valence conduction bands two materials, is crucial their functionality, but its experimental determination notoriously challenging. In contribution, we determine vdW heterojunction composed monolayer molybdenum disulfide (ML-MoS2) a triple cation-mixed perovskite, enabled by surface cleaning argon cluster sputtering. This effectively removes contaminants from perovskite/ML-MoS2 stack without causing damage, enabling direct band using ultraviolet X-ray photoelectron spectroscopy. Our results reveal type-II interface. Importantly, interfacial levels are not fixed once formed, MoS2 shift to those perovskite under 1 sun illumination compared dark, up 0.25 eV. realignment, conditions mimicking photovoltaic device operation, attributed photogenerated electron accumulation ML-MoS2. Microscopic photoluminescence (PL) measurements significant quenching PL signal heterojunction, confirming efficient charge transfer establishment heterojunction. These demonstrate "living" landscape, opening novel avenues perovskite/TMDCs devices.

Язык: Английский

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Gas Cluster Ion Beam Smoothing Technique: A Review

Nanomanufacturing and Metrology, Год журнала: 2025, Номер 8(1)

Опубликована: Май 20, 2025

Язык: Английский

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