Improved oil-based drilling fluid

Details Improved oil-based drilling fluid Improved oil-based drilling fluid

C - Chemistry, Metallurgy

09

K

C09K 8/32 (2006.01) C09K 8/36 (2006.01) C09K 8/52 (2006.01) E21B 21/06 (2006.01)

Patent

CA 2231555

Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted from a water-in--oil type emulsion to a oil-in-water type emulsion upon the protonation of the amine surfactant. Deprotonation of the amine surfactant reverses the conversion.

L'invention concerne des compositions d'émulsion inverse comprenant un tensioactif oléagineux, un tensioactif non oléagineux et un tensionactif d'amine utiles dans les techniques de forage de puits de gaz et de pétrole. Ce tensioactif d'amine est sélectionné de manière à pouvoir convertir l'émulsion inverse depuis une émulsion de type eau-dans-huile en une émulsion de type huile-dans-eau lors de la protonation du tensioactif d'amine. La déprotonation du tensioactif d'amine inverse la conversion.

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