Methods of making cement compositions using liquid additives...

C - Chemistry – Metallurgy – 04 – B

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C04B 20/00 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2560553

Methods of making a cement composition include combining a liquid additive comprising lightweight beads and fluid with a cement, wherein the liquid additive is substantially absent of a water absorbing material. The liquid additive may further comprise a dispersant. A mass ratio of the fluid to the lightweight beads in the liquid additive may be less than or equal to about 1:1. The liquid additive may be introduced to a delivery pump that supplies water to a cement mixing head for producing a cement slurry. Alternatively, the liquid additive may be introduced to a cement slurry as the slurry is being pumped into a wellbore. Systems for transporting the liquid additive include a recirculating pump for moving the liquid additive from the bottom of a vessel to the top of the vessel, thereby causing floating beads to be mixed down in the liquid additive.

La présente invention a trait à des procédés de fabrication d'une composition à base de ciment comprenant la combinaison d'un additif liquide comportant des billes légères et un fluide avec du ciment, ledit additif liquide étant sensiblement exempt d'une matière d'absorption d'eau. L'additif liquide peut également comporter un dispersant. Un rapport pondéral du fluide aux billes légères dans l'additif liquide peut être inférieur ou égal à environ 1:1. L'additif liquide peut être introduit dans une pompe de refoulement qui alimente de l'eau à une tête de mélange de ciment pour la production d'un lait de ciment. En variante, l'additif liquide peut être incorporé dans un lait de ciment lors du pompage du lait dans un trou de forage. Des systèmes pour le transport de l'additif liquide comprennent une pompe de recyclage pour le déplacement de l'additif liquide depuis le fond d'une cuve vers le haut de la cuve, permettant ainsi le mélange de billes flottantes vers le bas dans l'additif liquide.

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