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:
Feb. 01, 2011
Filed:
Sep. 18, 2006
Lijun Lin, Stafford, TX (US);
Yiyan Chen, Richmond, TX (US);
Philip F. Sullivan, Bellaire, TX (US);
Belgin Baser, Houston, TX (US);
Carlos Abad, Richmond, TX (US);
Jesse C. Lee, Paris, FR;
Lijun Lin, Stafford, TX (US);
Yiyan Chen, Richmond, TX (US);
Philip F. Sullivan, Bellaire, TX (US);
Belgin Baser, Houston, TX (US);
Carlos Abad, Richmond, TX (US);
Jesse C. Lee, Paris, FR;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Compositions and methods are given for delayed breaking of viscoelastic surfactant gels inside formation pores, particularly for use in hydraulic fracturing. Breaking inside formation pores is accomplished without mechanical intervention or use of a second fluid. Oxidizing agents such as air, oxygen, persulfates, bromates, peroxides, and others are used. The break may be accelerated, for example with a free radical propagating species, or retarded, for example with an oxygen scavenger. In certain brines, for example bromide brines, certain zwitterionic viscoelastic fluid systems that can decarboxylate and that require an anion-containing co-surfactant undergo delayed degradation if oxygen is present, for example from fluid preparation or in a foam.