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:
Nov. 25, 2014
Filed:
Dec. 21, 2009
Yiyan Chen, Sugar Land, TX (US);
Abbas Mahdi, Calgary, CA;
Richard Marcinew, Calgary, CA;
Matt Graham, Calgary, CA;
Timothy L. Pope, Cheyenne, WY (US);
Yiyan Chen, Sugar Land, TX (US);
Abbas Mahdi, Calgary, CA;
Richard Marcinew, Calgary, CA;
Matt Graham, Calgary, CA;
Timothy L. Pope, Cheyenne, WY (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
A method of treating a subterranean formation penetrated by a wellbore involves introducing an acid treatment fluid through the wellbore into the formation. The treatment fluid is formed from a zwitterionic viscoelastic surfactant, an acid in an amount to provide the treatment fluid with an initial pH of ≦0 and a rheology enhancer. The treatment fluid has a high viscosity at the initial pH and a lower viscosity when the pH of the treatment fluid is raised to an intermediate pH of from greater than 0 to about 5.