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:
Feb. 24, 2015
Filed:
Nov. 21, 2011
Mohamed Al-bagoury, Kristiansand S, NO;
Christopher Drysdale Steele, Strathkinness Fife, GB;
Mohamed Al-Bagoury, Kristiansand S, NO;
Christopher Drysdale Steele, Strathkinness Fife, GB;
Elkem AS, Oslo, NO;
Abstract
The present invention relates to oil well drilling comprising a weighting agent consisting of microfine, particulate ilmenite having a FeTiOcontent of at least 85% by weight, a specific surface area (BET) between 1 and 5 m/g, where 90% by volume of the particles have a size of less than 12.5 μm and a D50 between 3 μm and 6 μm by volume measured by laser diffraction using Malvern laser diffraction particle size analyzer, where the particles have an average circularity of at least 0.85 determined by image analysis. The invention further relates to high density oil well cement slurry comprising water, Portland cement, a to weighting material and optionally silica flour, microsilica, fiber, rubbery particles a fluid loss addition and a retarder, where the weighting material is particulate microfine ilmenite having a FeTiOcontent of at least 85% by weight, a specific surface area (BET) between 1 and 5 m/g, and where 90% by volume of the particles have a size of less than 12.5 μm and a D50 between 3 and 6 μm measured by laser diffraction using Malvern laser diffraction particle size analyzer, and where the particles have an average circularity of at least 0.85 determined by image analysis. Finally, the invention relates to a slurry of microfine ilmenite.