Additive for Well Cementing Applications
AssigneeSchlumberger Technology Corporation
InventorsBernard Piot, Narmina Finn
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Abstract
An additive for Portland-cement slurries comprises an alkanolamine polyborate. When added in concert with a set retarder, the alkanolamine polyborate minimizes or prevents premature gelation during placement in a subterranean well. The additive is particularly useful for highly reactive cements, and may reduce the amount of set retarder required to achieve a given placement time.
Claims15
A well cementing composition, comprising water, Portland cement, a set retarder and an alkanolamine polyborate compound.
A method for cementing a subterranean well having a borehole, comprising:
- (i) preparing a well cementing composition, the composition comprising water, Portland cement, a set retarder and an alkanolamine polyborate compound;
- and
- (ii) placing the composition into the well.
A method for inhibiting cement slurry gelation, comprising:
- (i) preparing a well cementing composition, the composition comprising water, Portland cement, a set retarder and an alkanolamine polyborate compound;
- and
- (ii) placing the composition into the well.
Dependencies are inferred from the claim text.