oil well drilling fluids, high density oil well cement slurry, and non-sedimenting stable aqueous slurry

摘要

oil well drilling fluids, high density oil well cement slurry, and non-sedimenting stable aqueous slurry. The present invention relates to drilling oil wells comprising a microfine particulate ilmenite densifying agent having a fetium content of at least 85% by weight, a specific surface area (bet) of between 1 and 5 m ^ 5 µg / g, wherein 90% by volume of the particles is less than 12.5 µm and a d50 between 3 µm and 6 µm by laser diffraction measured volume using A malvern laser diffraction particle size analyzer, wherein the particles have an average circularity of at least 0.85, determines by image analysis. The invention also relates to a high density oil well cement slurry comprising water, portland cement, a densifying material and optionally silica flour, microsilica, fiber, rubber particles, a fluid loss additive and a retardant, wherein the densifying material is microfine particulate elmenite having a fetium content of at least 85% by weight, a specific surface area (bet) of between 1 and 5 m 2 / g, and wherein 90% by volume of the particles are less than 12.5 µm in size and a d50 between 3 and 6 µm measured by laser diffraction using a malvern laser diffraction particle size analyzer and wherein the particles have an average circularity of at least 0.85, determined by image analysis. Finally, the invention relates to a microfine ilmenite slurry.