US Patent 7946343 Versatile additives for well cementing applications
Patent 7946343 was granted and assigned to Schlumberger on May, 2011 by the United States Patent and Trademark Office.
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The present invention provides a versatile additive for improving the properties of a cement slurry made with portland cement and to be utilized in well cementing, said versatile additive comprising type of silicates and/or borates that inhibit gelation occurring with the interstitial phase. The additive of the present invention improves significantly the rheology (i.e., strong dispersing effect) and can even overcome severe gelation problems. At temperature above about 88° C. (190° F.) the additive acts as retarder aid, enabling to reduce considerably the concentration of retarder required to achieve a given thickening time.
US Patent 07946343 Versatile additives for well cementing applications US Patent 7946343 Versatile additives for well cementing applications
US Patent 07946343 Versatile additives for well cementing applications
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