Abstract
To enhance understanding of gas-liquid transport in drilling overflows, methane solubility in oil-based and water-based drilling fluids was analyzed using a single degassing method at various densities, under high-temperature (30 °C–150 °C) and high-pressure (0–70 MPa) conditions. Findings revealed a direct correlation between methane solubility and pressure in oil-based drilling fluids, with solubility inversely related to temperature and density. In contrast, water-based drilling fluids showed declining solubility with increasing temperature at low pressure, with this trend reversing at high pressure. Notably, methane’s solubility in oil-based drilling fluids was found to be 16 times higher than in water-based drilling fluids at 150 °C and 70 MPa. A novel 2D quadratic polynomial model was introduced, which outperformed the conventional O’Bryan et al. model, achieving mean errors of 7.6% at 50 °C and 3.5% at 90 °C. This study bridged a significant knowledge gap regarding methane solubility under high-temperature and high-pressure conditions, elucidating solubility characteristics and mechanisms in both oil-based and water-based fluids while considering critical factors, such as temperature, pressure, and fluid density.
Published Version
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