Cement slurry compositions for cementing oil wells, adapted...

Details Cement slurry compositions for cementing oil wells, adapted... Cement slurry compositions for cementing oil wells, adapted...

E - Fixed Constructions

21

B

31/33

E21B 33/138 (2006.01) C04B 22/08 (2006.01) C04B 24/00 (2006.01) C09K 8/46 (2006.01)

Patent

CA 1243481

ABSTRACT A cement slurry composition suitable for cementing oil wells and adapted to control free water which often accumulates at the top of a cement column when setting in a well. The composition contains a cement, water, a dispersant and a free water controlling agent consisting of a small amount of a soluble salt of a magnesium, tin, lead, bismuth or a transition metal, or a combination of the foregoing. The presence of a free water control agent facilitates on-site attainment of a suitable amount of dispersant in the slurry which keeps both the yield value of the slurry and the free water at low levels.

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