Olaf M Stokke

42127483, Jul 15, 1980

May 26, 1978

5/910158

Howard H. Ferrell - Ponca City OK
Dell Conley - Ponca City OK
Burton M. Casad - Ponca City OK
Olaf M. Stokke - Ponca City OK

Conoco, Inc. - Ponca City OK

E21B 4322

252 855D

Filterability of aqueous solutions of polymers employed to thicken waterfloods such as biopolymers (e. g. heteropolysaccharides) is improved by addition of a surfactant (e. g. a sulfated alkoxylated alcohol). Filterability is further enhanced by addition of an ethoxylated alcohol surfactant and/or an alcohol.

41652576, Aug 21, 1979

Mar 13, 1978

5/886021

Olaf M. Stokke - Ponca City OK

Continental Oil Company - Ponca City OK

C12D 1304
E21B 4322

435262

In an enhanced recovery process involving flooding of subterranean formations with aqueous mixtures of biopolymers, filterability of the biopolymer is synergistically enhanced by treatment with ESPERASE. RTM. enzyme at a pH range of 12. 5 to 13. The range is narrow and exclusive since pHs as high as 12. 1 give poor results. The biopolymer can be any one containing debris which must be reduced by the enzyme.

44352956, Mar 6, 1984

May 17, 1982

6/379210

Olaf M. Stokke - Ponca City OK
Roy C. Sias - Ponca City OK

Conoco Inc. - Ponca City OK

C09K 702
E21B 4316

252 855D

An improved sulfonate suitable for waterflooding is formed by sulfonating a blend of two alkyl aromatic feedstocks, one being a high molecular weight monoalkylbenzene while the second is a mixture of normal alkyl aromatic compounds such as monoalkyl benzenes, dialkylbenzenes, and diphenyl alkanes. This feedstock is either sulfonated after blending or before blending to provide a blended non-sulfonate/sulfonate ratio in the range of 0. 10 to 0. 25. The sulfonate effectiveness of this system increases as the non-sulfonate/sulfonate ratio increases.

50056557, Apr 9, 1991

Mar 28, 1989

7/330392

Olaf M. Stokke - Ponca City OK
David A. Flanigan - Cleveland OK
Robert B. Ramsey - Wilmington DE
Robert E. Williams - Houston TX
John Huycke - Ponca City OK

Conoco Inc. - Ponca City OK

B01D 1100
B08D 308
C09K 700
E21B 2106

175 66

1,1-dichloro-2,2,2-trifluoroethane or 1,1-dichloro-1-fluoroethane are employed as solvents to remove oleophylic material from mineral particulates. In one aspect the method of this invention includes the steps of transporting oil-based mud-laden cuttings to a solid feed tank wherein the oil-based cuttings are subjected to turbulent mixing to leave the surface of the cuttings substantially free of oil. The cuttings are then subjected to countercurrent flow of solvent in order to separate oily solvent and fines smaller than a chosen diameter from the heavier solids. The heavier solids are cleaned of any remaining oil-based muds, separated from cleaning solvent and ultimately returned to the sea environment.