Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component
Reexamination Certificate
2008-01-22
2008-01-22
Gulakowski, Randy (Department: 1796)
Earth boring, well treating, and oil field chemistry
Well treating
Contains organic component
C507S241000, C507S255000, C507S260000, C507S261000, C507S266000, C507S267000, C166S282000
Reexamination Certificate
active
07320952
ABSTRACT:
Composition and method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a co-gelling agent selected from triblock oligomeric compounds having hydrophilic (for example polyether) and hydrophobic (for example alkyl) portions. The co-gelling agent also increases fluid viscosity and very low co-gelling agent 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, filed Nov. 22, 2004 titled, “Viscoelastic Surfactant Rheology Modification”.
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Chen Yiyan
Lee Jesse C.
Cate David
Figueroa John J.
Fonseca Darla
Gulakowski Randy
Nava Robin
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