C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 28/04 (2006.01) C04B 28/26 (2006.01) C04B 40/00 (2006.01)
Patent
CA 2626739
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.
La présente invention concerne un additif versatile permettant d'améliorer les propriétés d'un laitier de ciment fabriqué à partir de ciment Portland et destiné à être utilisé dans la cimentation de puits, ledit additif versatile contenant un certain type de silicates et/ou borates qui inhibent la gélification se produisant avec la phase interstitielle. L'additif de cette invention permet d'améliorer considérablement la rhéologie (à savoir, un effet de dispersion fort) et il peut même permettre de surmonter de sérieux problèmes de gélification. A une température supérieure à environ 88 °C (190°F), l'additif agit comme une aide de retardateur, ce qui permet de diminuer considérablement la concentration du retardateur requise pour parvenir à un temps d'épaississement donné.
Caritey Jean-Philippe
Michaux Michel
Pyatina Tatiana
Thery Frederic
Schlumberger Canada Limited
Smart & Biggar
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