Compositions and methods for well cementing
First Claim
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1. A method for cementing a subterranean well having a borehole, comprising:
- (i) providing a cementing composition comprising;
a. a geopolymer composition consisting of an aluminosilicate source, an activator and a carrier fluid; and
b. a retarder that comprises at least one organic compound comprising at least one nitrogen atom such that the retarder retards a setting time, a thickening time, or both of the geopolymer composition;
(ii) pumping the composition into the borehole; and
(iii) allowing the composition to set and harden,wherein the activator is a carbonate salt, a metal silicate, a metal aluminate, sodium hydroxide or potassium hydroxide,wherein the geopolymer composition undergoes dissolution followed by polycondensation to form a poly(sialate) network, a poly(sialate-siloxo) network or a poly(sialate-disiloxo) network.
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Abstract
Organic compounds containing at least one nitrogen atom are particularly suitable as retarders for geopolymeric systems employed as well cements. Preferred compounds include aminated polymers, amine phosphonates, quaternary ammonium compounds and tertiary amines. The geopolymeric compositions are suitable for primary cementing and remedial cementing operations. The preferred temperature range within which the retarders operate is between about 20° C. and 120° C.
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Citations
6 Claims
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1. A method for cementing a subterranean well having a borehole, comprising:
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(i) providing a cementing composition comprising; a. a geopolymer composition consisting of an aluminosilicate source, an activator and a carrier fluid; and b. a retarder that comprises at least one organic compound comprising at least one nitrogen atom such that the retarder retards a setting time, a thickening time, or both of the geopolymer composition; (ii) pumping the composition into the borehole; and (iii) allowing the composition to set and harden, wherein the activator is a carbonate salt, a metal silicate, a metal aluminate, sodium hydroxide or potassium hydroxide, wherein the geopolymer composition undergoes dissolution followed by polycondensation to form a poly(sialate) network, a poly(sialate-siloxo) network or a poly(sialate-disiloxo) network. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification