Low density cements for use in cementing operations

Details Low density cements for use in cementing operations Low density cements for use in cementing operations

C - Chemistry, Metallurgy

04

B

C04B 28/04 (2006.01) C04B 18/30 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2600959

A cement mix suitable for blocking or plugging an abandoned pipeline or back filling a mine shaft, tunnel or excavations contains Portland cement or a cement blend of two components selected from Portland cement, fly ash, pozzolan, slag, silica fume and gypsum; diatomaceous earth; zeolite and an inorganic salt accelerator. The cement mix may further contain an alkali metasilicate and/or alkali silicate. A cementitious slurry, formulated from the cement mix, may have a density less than or equal to 1500 kg/m3, and exhibits good compressive strength.

Un mélange de ciment approprié pour obturer une conduite abandonnée ou pour remblayer un puits de mine, un tunnel ou des excavations, contient du ciment portland ou un mélange de ciment contenant deux éléments sélectionnés du ciment portland, des cendres volantes, de la pouzzolane, du laitier, de la fumée de silice et du gypse; du kieselguhr; de la zéolite; et un accélérateur de sel inorganique. Le mélange de ciment peut de plus contenir un métasilicate alcalin et/ou un silicate alcalin. Un coulis de ciment, formulé à partir du mélange de ciment, peut présenter une densité inférieure ou égale à 1 500 kg/m3 et une bonne résistance à la compression.

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