The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 2008
Filed:
Nov. 22, 2004
Jesse Lee, Sugar Land, TX (US);
Yiyan Chen, Richmond, TX (US);
Timothy Pope, Sugar Land, TX (US);
Eric Hanson, San Diego, CA (US);
Samuel Cozzens, Rock Springs, WY (US);
Taner Batmaz, Rock Springs, WY (US);
Jesse Lee, Sugar Land, TX (US);
Yiyan Chen, Richmond, TX (US);
Timothy Pope, Sugar Land, TX (US);
Eric Hanson, San Diego, CA (US);
Samuel Cozzens, Rock Springs, WY (US);
Taner Batmaz, Rock Springs, WY (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
A method for shortening the shear recovery time of zwitterionic viscoelastic surfactant fluids by adding a rheology enhancer having the structure:R-(EO)(PO)—R'—OHin 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.