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:
Apr. 19, 2005
Filed:
Apr. 04, 2001
Erik B. Nelson, Houston, TX (US);
Bernhard Lungwitz, Stafford, TX (US);
Keith Dismuke, Katy, TX (US);
Mathew Samuel, Punalur, IN;
Golchi Salamat, Stafford, TX (US);
Trevor Hughes, Cambridge, GB;
Jesse Lee, Sugar Land, TX (US);
Philip Fletcher, Houston, TX (US);
Diankui Fu, Missouri City, TX (US);
Richard Hutchins, Sugar Land, TX (US);
Michael Parris, Richmond, TX (US);
Gary John Tustin, Cambridge, GB;
Erik B. Nelson, Houston, TX (US);
Bernhard Lungwitz, Stafford, TX (US);
Keith Dismuke, Katy, TX (US);
Mathew Samuel, Punalur, IN;
Golchi Salamat, Stafford, TX (US);
Trevor Hughes, Cambridge, GB;
Jesse Lee, Sugar Land, TX (US);
Philip Fletcher, Houston, TX (US);
Diankui Fu, Missouri City, TX (US);
Richard Hutchins, Sugar Land, TX (US);
Michael Parris, Richmond, TX (US);
Gary John Tustin, Cambridge, GB;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the use of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system such as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.