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STRENGTH RETROGRESSION MATERIALS AND WEIGHTING AGENTS |
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| INTRODUCTION
Weighting agents are used in portland cement to increase the slurry density. These materials are generally chemically inert particulates which have a high specific gravity. They do not affect the thickening time of the cement slurry, but may significantly improve the compressive strength. Weighting agents are predominantly used to combat high bottom hole pressures. Silica flour is commonly used in cement formulations at BHST above 230° F to combat strength retrogression. It is also used a weighting agents in some cases. The use of Messina dispersants (CA-FR3P and CA-FR3L) is advised to reduce the volume of mix water required for mixing cement with weighting agents. |
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100 mesh silica for increasing slurry density and eliminating strength retrogression (>230° F.) Product Data Sheet |
Silica flour for increasing slurry density and eliminating strength retrogression (>230° F.) |
Tech grade hematite weighting agent, S.G.= 4.95, some additonal water required for wetting. |
Select, coarse grade hematite weighting agent, S.G.= 4.95, little extra water needed for wetting. |
Graded ilmenite weighting agent, S.G.= 4.45, no extra water needed for wetting Product Data Sheet |
Barite weighting agent, S.G.= 4.20, extra mix water required for wetting Product Data Sheet |
Manganese weighting agent Product Data Sheet |
Cement Additives and Specialty Products
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Last modified: November 15, 2004