【摘 要】
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This paper presents a study on the effect of fine ferric hydroxide and gypsum on the properties of oil-well cement slurry and hardened oil-well cement slurry in the temperature condition of 750C.Since
【机 构】
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Vietnam Institute for Building Materials, Vietnam
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
This paper presents a study on the effect of fine ferric hydroxide and gypsum on the properties of oil-well cement slurry and hardened oil-well cement slurry in the temperature condition of 750C.Since fine ferric hydroxide, which mainly consists of Fe(OH)3, is in the shape of spherical particles, micrometers in size, and has good ability to disperse in water, it improves the flexibility of oil-well cement slurry by a mechanism as called "dilution mechanism".At the temperature of 750C, calcium hydroxide took chemical reactions with fine ferric hydroxide and gypsum (CaSO4.2H2O), forming calcium Ferro sulfate, and thus increased the strength of the hardened oil-well cement paste.In addition, a simultaneous use of fine ferric hydroxide and gypsum can actively adjust thickening time of slurry and enhance the strength of hardened oil-well cement slurry in the well bore.
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