Dynamic and Static Forces Required To Remove a Discontinuous Oil Phase from Porous Media Containing Both Oil and Water

作者：J.J. Taber · 发表于：Society of Petroleum Engineers Journal · 年份：1969 · DOI：10.2118/2098-pa · 被引用次数：352 · 研究领域：Enhanced Oil Recovery Techniques、Hydraulic Fracturing and Reservoir Analysis、Reservoir Engineering and Simulation Methods

Abstract A number of experiments were carried out on samples of reservoir rocks to determine the conditions required to remove the oil (often termed residual oil) that remains as a discontinuous phase after a complete water flood. In every case it was found that the oil removed was a unique function of the ratio delta P/L sigma, where delta P is the pressure drop across the distance L and sigma is pressure drop across the distance L and sigma is the interfacial tension between the oil and water. It was found that no residual oil can be removed from a porous rock until a critical value of delta P/L sigma is exceeded. The critical ratio appears P/L sigma is exceeded. The critical ratio appears to be a fundamental property of the rock. For Berea sandstone samples, the critical ratio has a value of about 5 (psi/ft)/(dyne/cm) in common field units. If this critical value is exceeded by applying more pressure or by reducing the oil-water interfacial pressure or by reducing the oil-water interfacial tension (or both), some additional oil is invariably produced. The exact amount of additional oil is produced. The exact amount of additional oil is always a monotonically increasing function of the increase in the value of the ratio delta P/L sigma. To recover economically attractive amounts of oil, the critical delta P/L sigma value should be exceeded by at least one order of magnitude. In the laboratory with short core samples (L is very small), the required high values of delta P/L s...