Non toxic, biodegradable well fluids

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/34 (2006.01)

Patent

CA 2172965

Well fluids such as drilling muds, especially useful in offshore drilling, are formulated with a hydrocarbon oil blend of a low viscosity poly alpha-olefin (PAO) such as a low molecular weight oligomer of decene together with a C12 to C18 paraffinic hydrocarbon of petroleum origin and a C10 to C18 olefin such as dodecene-1 or tetradecene-1. The fluids exhibit good biodegradability and are non-toxic to marine organisms; they also meet viscosity and pour points specifications for formulation into oil based muds.

On formule des fluides de forage tels que des boues de forage, particulièrement utiles pour le forage en mer, avec un mélange d'huile d'hydrocarbure comprenant une poly .alpha.-oléfine (PAO) de faible viscosité telle qu'un oligomère de décène à bas poids moléculaire associée à un hydrocarbure de paraffine en C¿12? à C¿18?, d'origine pétrolière ainsi qu'à une oléfine en C¿10? à C¿18? telle que le dodécène-1 ou le tétradécène-1. Ces fluides ont une bonne biodégradabilité et ne sont pas toxiques pour les organismes marins; ils possèdent également les spécifications de viscosité et de point de congélation requises dans la formulation des boues à base d'huile.

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