Mobil Oil Corporation

Aziz S Odeh

Billy J Dotson

Corrected oil relative permeability values for a core sample are determined from dynamic displacement measurements by the steps of plotting a ratio of oil rate output (q.sub.o) to calculated oil relative permeability values (k.sub.ro) vs. average water saturation (S.sub.w), determining if a straight line segment exists in areas of the plot corresponding to high average oil saturations, and if it does, extrapolating the straight line segment to the end of the plotted data, otherwise plotting a tangent curve from a beginning point of the plot, and correcting the calculated oil relative permeability values K.sub.ro by mulitplying the calculated values k.sub.ro by a ratio of a value on the q.sub.o /k.sub.ro plot to a value on the extrapolated line or constructed tangent curve at the same average water saturation value. The applied corrections eliminate distortions in the calculated oil relative permeability values k.sub.ro due to an end effect at the core sample which causes distortions in the dynamic displacement measurements.

Method for determining consistent oil relative permeability values from

A method of recovering heavy oil from a subterranean, permeable, heavy oil-bearing reservoir in which an oxygen-containing gas is injected into the lower portion of the reservoir to establish an in-situ combustion reaction therein and to form a combustion front near the injection well. Injection of the oxygen-containing gas is continued to advance the combustion front that heats the oil and generates gas to displace the oil through the reservoir toward a producing well. Water is injected into the upper portion of the reservoir during combustion to prevent gases from migrating into the upper portion of the reservoir, scavenge heat from the burned out portion of the reservoir, and displace oil from the reservoir, particularly the lower region, toward a production well. The areal sweep efficiency of the injected water may be improved by the addition of thickening agents and water-soluble polymers.

Method of improved oil recovery by simultaneous injection of water with

A method for recovering heavy oil from a subterranean, permeable, heavy oil-containing formation comprising injecting steam into the lower portion of the formation, injecting a controlled amount of unheated water into the upper portion of the formation and displacing the oil through the formation toward a production well where the oil is produced. The steam injection releases heat (BTU) to the heavy oil and formation reducing the viscosity of the oil and increasing its mobility for recovery. The sequence of injection of the water and steam is designed to yield the maximum oil recovery per BTU injected by increasing the volume of the formation subjected to heating and increasing the vertical sweep.

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Dallas, TX, United States of America

Aziz S Odeh