Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Reexamination Certificate
2004-12-15
2008-07-22
Gulakowski, Randy (Department: 1796)
Earth boring, well treating, and oil field chemistry
Well treating
Contains organic component
C507S241000, C507S244000, C507S245000, C507S260000, C507S261000, C507S266000, C507S267000, C166S308100
Reexamination Certificate
active
07402549
ABSTRACT:
A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer selected from partially hydrolyzed polyvinyl ester and partially hydrolyzed polyacrylates. The rheology enhancer also increases fluid viscosity and very low rheology enhancer concentration is needed. Preferred surfactants are betaines and quaternary amines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.
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U.S. Appl. No. 10/994,664—Viscoelastic Surfactant Rheology Modification.
Chen Yiyan
Lee Jesse C.
Pope Timothy L.
Sullivan Philip F.
Cate David
Figueroa John J
Gulakowski Randy
Mitchell Thomas O.
Nava Robin
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