Viscoelastic surfactant rheology modification

Details Viscoelastic surfactant rheology modification Viscoelastic surfactant rheology modification

2008-03-11

2008-03-11

Gulakowski, Randy (Department: 1796)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S260000, C507S266000, C507S267000, C166S308200

Reexamination Certificate

active

10994664

ABSTRACT:
A method for shortening the shear recovery time of zwitterionic viscoelastic surfactant fluids by adding a rheology enhancer having the structure:in-line-formulae description="In-line Formulae" end="lead"?R-(EO)x(PO)y—R′—OHin-line-formulae description="In-line Formulae" end="tail"?in which R is an alkyl group that is straight chained or branched, saturated or unsaturated, and contains from 3 to about 18 carbon atoms, x is from 0 to about 14, y is from 0 to about 7, R′ is an alkyl group that contains from 0 to about 14 carbon atoms and is straight chained, branched if having more than 3 carbon atoms, saturated, unsaturated if having more than one carbon atom, the total number of carbon atoms in R plus R′ is from 3 to about 21, and the EO and PO groups, if present, may be in any order. The rheology enhancer also increases fluid viscosity and thermal stability. Preferred surfactants are betaines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.

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U.S. Appl. No. 11/012,446, filed Dec. 15, 2004 titled, “Viscoelastic Surfactant Rheology Modification”.

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