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. 08, 2014
Filed:
Oct. 14, 2011
Deepak Khatri, Houston, TX (US);
Mitch Rice, Richmond, TX (US);
Nikole Strickler, Denver, CO (US);
Robert Williams, Houston, TX (US);
Deepak Khatri, Houston, TX (US);
Mitch Rice, Richmond, TX (US);
Nikole Strickler, Denver, CO (US);
Robert Williams, Houston, TX (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
Expansive cements for use in cementing subterranean wells contain an encapsulated gas-generating substance. The gas-generating substance comprises one or more materials that release hydrogen, nitrogen or both. The gas-generating substance is encapsulated by a coating comprising a polymer. The coating prevents premature gas release at the surface during slurry mixing, and promotes gas release at a desired location in the subterranean well. The released gas may also control the internal pore pressure of the cement slurry, thereby inhibiting the invasion of formation fluids into the borehole.