Invert emulsion drilling mud

Details Invert emulsion drilling mud Invert emulsion drilling mud

C - Chemistry, Metallurgy

09

K

C09K 8/36 (2006.01)

Patent

CA 2101884

A water-in-oil invert emulsion drilling mud is prepared with a hydrated nitrogen-containing double salt, as a brine solution in the aqueous phase, to prevent the hydration of subterranean formation clays. Suitable nitrogen-containing double salts include double salts containing alkali metal, alkaline-earth metal and ammonium nitrates and nitrites. The nitrogen-based invert emulsion mud of the present invention eliminates the use of calcium chloride in the prior art invert emulsion drilling muds, thereby reducing the environmental impact of the drilling operation.

Émulsion inverse d'eau dans l'huile, comme fluide de forage; il est préparé à l'aide d'un sel complexe hydraté, renfermant de l'azote, sous forme de solution de saumure dans la phase aqueuse; il permet d'empêcher l'hydratation des argiles de formations souterraines. Parmi les sels complexes azotés utilisables figurent les sels complexes contenant un métal alcalin, un métal alcalino-terreux et des nitrates et nitrites d'ammonium. Le fluide d'émulsion inverse azotée de la présente invention élimine l'utilisation du chlorure de calcium des anciennes techniques de forage à l'aide de fluides d'émulsion inverse, ce qui réduit les effets nuisibles du forage sur l'environnement.

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