Ki Sun Hong

52018156, Apr 13, 1993

Dec 20, 1991

7/811399

Ki C. Hong - Orange CA
Victor M. Ziegler - Bakersfield CA

Chevron Research and Technology Company - San Francisco CA

E21B 4324
E21B 4330

166245

In an inverted nine-spot pattern in an areally homogeneous reservoir, oil recovery is enhanced when the completion of the sidewells is restricted to the lower 20% of the reservoir. An inverted nine-spot pattern has a steam injection well at the center of the pattern and production wells at each of the four corners of the pattern and at the center of each side of the pattern. Steam is injected at the center well, and oil is produced from sidewells and corner wells.

46403558, Feb 3, 1987

Mar 26, 1985

6/716292

Ki C. Hong - Orange CA
Suzanne Griston - San Dimas CA
Joseph W. Ault - Moraga CA

Chevron Research Company - San Francisco CA

E21B 3600
E21B 4312
E21B 4318
E21B 4324

166269

The present invention is a method and apparatus for injecting compressible fluids into multiple zones of a hydrocarbon bearing formation, in particular injecting compressible fluid at a predetermined, constant rate into multiple zones through a single tubing string. Producing zones are packed off and limited entry outlets are installed on the injection tubing string at each producing zone. Injection pressure is maintained and limited entry outlets are designed and sized such that the compressible fluid reaches sonic flow through the outlets so that the flow rate no longer responds to changes in downstream pressures.

51901030, Mar 2, 1993

Dec 20, 1991

7/811104

Suzanne Griston - San Dimas CA
Ki C. Hong - Orange CA

Chevron Research and Technology Company - San Francisco CA

E21B 4324
E21B 4700

166250

A two-phase fluid is metered by injecting a surfactant into the two-phase fluid, homogenizing the fluid and surfactant with either a porous medium or an orifice plate to form a pseudo-single phase fluid, and metering the pseudo-single phase fluid. In one embodiment, both the injection of surfactant and the homogenization with either a porous medium or an orifice plate occur within one foot of where the pseudo-single phase fluid is metered. In another embodiment, the surfactant is injected at a wellhead and the metering occurs downhole.

51018985, Apr 7, 1992

Mar 20, 1991

7/672256

Ki C. Hong - Orange CA

Chevron Research & Technology Company - San Francisco CA

E21B 4324
E21B 4330

166245

Steam is injected in a multi-spot pattern in a dipping reservoir. The injection point of that steam is downdip and is offset from the pattern center by at least one-fifth the distance from the pattern center to the downdip producer row of that pattern. Preferably, the amount of offset is between two-fifths and three-fifths the distance from the pattern center to the downdip producer row.