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:
Jul. 02, 2013
Filed:
Dec. 23, 2010
Jeffrey James Miller, Spring, TX (US);
Nicholas Braley, Spring, TX (US);
Donald R. Siems, Houston, TX (US);
Patrick Chris Baker, Houston, TX (US);
Dale Jamison, Humble, TX (US);
Jeffrey James Miller, Spring, TX (US);
Nicholas Braley, Spring, TX (US);
Donald R. Siems, Houston, TX (US);
Patrick Chris Baker, Houston, TX (US);
Dale Jamison, Humble, TX (US);
Halliburton Energy Services, Inc., Houston, TX (US);
Abstract
Invert emulsion drilling fluids that have extended emulsion stability and reduced sag potential are described herein. The drilling fluids comprise an invert emulsion, a weighting agent, and a plurality of colloidal particles. The invert emulsion comprises an oleaginous fluid continuous phase, an aqueous fluid internal phase, and a surfactant. At least a portion of the plurality of colloidal particles interact with the surfactant to form an associative supporting structure that inhibits sag of the weighting agent. In some embodiments, the weighting agent comprises barite particles, particularly barite particles that are less than about 45 μm in size. Methods for placing the invert emulsion drilling fluids in a subterranean formation via a wellbore are also disclosed.