| 摘要 |
<p>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.</p> |
