C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
31/28, 261/58
C04B 22/16 (2006.01) C04B 24/00 (2006.01) C04B 28/02 (2006.01) C04B 40/00 (2006.01) C09K 8/467 (2006.01) E21B 33/14 (2006.01)
Patent
CA 2322261
The present invention relates to systems for retarding setting in an oilfield well cement slurry constituted by a solution of a phosphonate selected from methylene phosphonic acid derivatives and a phosphate, in particular selected from the following salts or the corresponding acids: mono-phosphates (ortho-phosphates PO4 2-, meta- phosphates PO3-), acyclic poly-phosphates (pyrophosphates P2O7 4-, tripolyphosphates P3O10 5-) or cyclic poly-phosphates. The system preferably may also comprise a retarder booster and is more particularly applicable to cementing at low or medium temperatures.
La présente invention concerne des systèmes destinés à retarder la prise de lait de ciment dans un puits de champ pétrolifère. Ces systèmes comprennent une solution d'un phosphonate choisi dans le groupe des dérivés d'acide méthylène phosphonique, et d'un phosphate choisi, en particulier, dans le groupe des sels ou des acides correspondants suivants: monophosphates (orthophosphate PO4<2->, métaphosphates PO3<->), polyphosphates acycliques (pyrophosphates P2O7<4->, tripolyphosphates P3O10<5->) ou polyphosphates cycliques. Le système peut aussi, de préférence, comprendre un modérateur de prise, et il est notablement applicable à la cimentation à des températures basses ou moyennes.
Barlet-Gouedard Veronique
Brand Fabien
Maroy Pierre
Nilsson Frederik
Schlumberger Canada Limited
Smart & Biggar
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