[12] Patent
[11] Patent No.:GC0007641  
[45] Date of Publishing the Grant of the Patent: 30/Apr /2018                48/2018  
Number of the Decision to Grant the Patent:2018/126407
Date of the Decision to Grant the Patent:24/Apr/2018

[21] Application No.:GC 2011-20123

[22] Filing Date:24/12/2011

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventors:1- MILLER, Jeffrey, James،2- BRALEY, Nicholas،3- SIEMS, Donald, R.،4- BAKER, Patrick, Chris،5- JAMISON, Dale

[73] Owner: Halliburton Energy Services, Inc., 10200 Bellaire Boulevard, Texas 77072, Houston, USA

[74] Agent: Suleiman I. Al-Ammar Law Office




Int. Cl.: C09K 8/03, 8/36 (2006.01)

[56] Cited Documents:

-US 2009258799 A1 (HODDER MIKE [GB] ET AL) 15 October 2009
-WO 2008033838 A2 (MI LLC [US]; BALLARD DAVID ANTONY [GB]; MASSAM JARROD [GB]) 20 March 2008
Examiner: Eng. Mohammed A. AlShamrani

[57] 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 ?m in size. Methods for placing the invert emulsion drilling fluids in a subterranean formation via a wellbore are also disclosed.
No. of claims: 16     No. of figures: 8


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