Billy J Dotson

US Patent:

44933690, Jan 15, 1985

Filed:

Mar 24, 1983

Appl. No.:

6/478596

Inventors:

Aziz S. Odeh - Dallas TX
Billy J. Dotson - Grand Prairie TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 43243

US Classification:

166261

Abstract:

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.

US Patent:

46226435, Nov 11, 1986

Filed:

Oct 21, 1983

Appl. No.:

6/544176

Inventors:

Billy J. Dotson - Grand Prairie TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

G01N 1508

US Classification:

364556

Abstract:

Corrected water relative permeability values for a core sample are determined from dynamic displacement measurements by the steps of plotting a ratio of water rate output (q. sub. w) to calculated water relative permeability values (k. sub. rw) 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 to the plotted ratio from a beginning point of the plot, producing a line in parallel with the extrapolated straight line segment or the tangent line but shifted so as to pass through the irreducible water saturation point S. sub. iw, and correcting the calculated water relative permeability values k. sub. rw by multiplying the calculated values k. sub.

US Patent:

44272367, Jan 24, 1984

Filed:

Aug 18, 1981

Appl. No.:

6/293785

Inventors:

Billy J. Dotson - Grand Prairie TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4328
E21C 4114

US Classification:

299 5

Abstract:

The present invention relates to a method for improving the recovery of mineral values from ore bodies subjected to in-situ leaching by controlling the flow behavior of the leaching solution. Foam is introduced into the higher permeability zones of the ore body to act as a diverting agent forcing the leaching fluids into the lower permeability previously non-contacted areas resulting in increased mineral values recovery.

US Patent:

44744080, Oct 2, 1984

Filed:

Aug 11, 1982

Appl. No.:

6/407202

Inventors:

Billy J. Dotson - Grand Prairie TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4328
E21B 4700

US Classification:

299 4

Abstract:

The ammonium ions in a subterranean clay-containing formation may be removed by flushing the formation with a calcium ion containing restoration fluid having substantially the highest pH effective to prevent precipitation of calcium hydroxide from said restoration fluid. The calcium ion concentration in the restoration fluid is maintained between about 10,000 and 100,000 ppm until the ammonia concentration in the produced fluid peaks or is less than about 100 ppm. Thereafter the calcium ion concentration is maintained at about 400 to about 600 ppm until the desired level of ammonia is obtained, usually about 1-3 ppm.

US Patent:

43925308, Jul 12, 1983

Filed:

Apr 30, 1981

Appl. No.:

6/259329

Inventors:

Aziz S. Odeh - Dallas TX
Billy J. Dotson - Grand Prairie TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4324

US Classification:

166269

Abstract:

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.