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:
Sep. 22, 2015
Filed:
Nov. 03, 2010
Applicants:
Deepak Khatri, Houston, TX (US);
Cecilia Nguyen, Houston, TX (US);
Syed Ali, Sugar Land, TX (US);
Inventors:
Assignee:
Schlumberger Technology Corporation, Sugar Land, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/467 (2006.01); C04B 28/04 (2006.01); C04B 24/14 (2006.01); C09K 8/46 (2006.01); C04B 103/20 (2006.01);
U.S. Cl.
CPC ...
C04B 28/04 (2013.01); C04B 24/14 (2013.01); C09K 8/46 (2013.01); C09K 8/467 (2013.01); C04B 2103/20 (2013.01);
Abstract
Cement retarders for well cements are based on hydrophobins. Hydrophobins are proteins or polypeptides that form hydrophobic coatings on surfaces. The size of the hydrophobins is preferably between about 100 and 350 amino acids, and the preferred hydrophobin concentration is between about 0.001% and 1.0% by weight of cement. Portland cement is the preferred well cement. Cement slurries containing hydrophobins are useful for both primary and remedial cementing applications.