Method and fluid for controlling saturation of a formation...

Details Method and fluid for controlling saturation of a formation... Method and fluid for controlling saturation of a formation...

C - Chemistry, Metallurgy

09

K

C09K 8/575 (2006.01)

Patent

CA 2414809

The invention concerns a method and a fluid for drilling or operating in a well passing through a porous and permeable formation, wherein an aqueous well fluid flows into said well. The method consists in adding to the fluid, besides the standard constituents for such a fluid, not more than 3 wt. % of a composition obtained from a grease, oil, and an alcohol, the length of the chains of the acid and alcohol parts are selected such that the resulting ester has sufficient dispersion in water, compatibility with said constituents, does not emulsify with the oil of the reservoir and is sufficiently adsorbed on the porous formation.

La présente invention concerne une méthode et un fluide pour forer ou intervenir dans un puits traversant une formation poreuse et perméable, dans laquelle un fluide de puits à base d'eau est en circulation dans ledit puits. Dans la méthode, on ajoute au fluide, en sus des constituants conventionnels pour un tel fluide, au plus 3 % en poids d'une composition obtenue à partir d'une graisse, ou huile, et d'un alcool, les longueurs de chaînes des parties acide et alcool sont choisies telles que l'ester ainsi obtenu présente une dispersion suffisante dans l'eau, une compatibilité avec lesdits constituants, ne forme pas d'émulsion avec l'huile du réservoir et s'adsorbe suffisamment sur la formation poreuse.

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