C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/487 (2006.01) C04B 24/16 (2006.01) C04B 24/28 (2006.01) C08L 61/00 (2006.01) C08L 79/02 (2006.01) C09K 8/035 (2006.01) E21B 43/22 (2006.01)
Patent
CA 2715588
An additive based on a polyalkylenimine and a sulphonated formaldehyde- containing condensate and its use as a fluid loss additive in the cementing of wells in the mineral oil and natural gas sector is claimed. Polyethylenimine, polypropylenimine and polybutylenimine are suitable as typical representatives of the polyalkylenimines and may also be derivatised. Preferred condensates are acetone/formaldehyde resins. Those additives according to the invention which are subjected to maturing, in particular by allowing to stand, prior to their use achieve a particularly low fluid loss value.
L'invention concerne un additif à base d'une polyalkylène-imine et d'un produit de condensation contenant du formaldéhyde sulfoné, et son utilisation comme réducteur de filtrat pour la cimentation de trous de forage de pétrole et de gaz naturel. Des représentants typiques des polyalkylène-imines sont ici la polyéthylène-imine, la polypropylène-imine et la polybutylène-imine, ainsi que leurs dérivés. Les résines acétone/formaldéhyde constituent des produits de condensation privilégiés. De tels additifs selon l'invention, qui peuvent être soumis avant leur utilisation à une maturation notamment en les laissant reposer, permettent d'obtenir une perte de fluide particulièrement faible.
Plank Johann
Reichenbach-Klinke Roland
Setiawan Tinton
Basf Se
Osler Hoskin & Harcourt Llp
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