Latex additive for water-based drilling fluids

Details Latex additive for water-based drilling fluids Latex additive for water-based drilling fluids

C - Chemistry, Metallurgy

09

K

C09K 8/508 (2006.01) E21B 21/00 (2006.01) E21B 33/138 (2006.01) E21B 37/06 (2006.01)

Patent

CA 2378952

The use of polymer latices is described for fluid loss control in water-based drilling fluids. The latices used are water insoluble. The latices are essentially non-swelling in an aqueous solution. The latices are selected from known latices such that they are absorbed within a filter cake building up at the interface between the wellbore and porous formations in essentially the same state as they are in the aqueous drilling fluid during circulation.

L'invention concerne l'utilisation de substances à base de latex polymères pour réduire le filtrat dans des liquides de forage aqueux. Les substances à base de latex utilisées sont insolubles dans l'eau et ne gonflent sensiblement pas dans une solution aqueuse. Les substances à base de latex sont sélectionnées parmi des substances à base de latex connues de sorte qu'elles soient absorbées dans un gâteau de filtration en formation à l'interface entre le trou de forage et les formations poreuses, sensiblement dans le même état que celui dans lequel elles se trouvent dans le liquide de forage aqueux lorsqu'il est en circulation.

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