Well servicing fluid for trenchless directional drilling

Details Well servicing fluid for trenchless directional drilling Well servicing fluid for trenchless directional drilling

C - Chemistry, Metallurgy

09

K

C09K 8/20 (2006.01)

Patent

CA 2285309

Disclosed is a composition comprising a water swellable clay, and particularly a sodium montmorillonite clay such as bentonite, sodium carbonate, and a water- soluble biopolymer, and particularly a xanthan biopolymer. The composition when mixed with fresh water forms an aqueous drilling mud having the desirable fluid properties including a high gel strength profile of 10-second/10- minute/30-minute gel and a low API fluid loss for use in trenchless directional drilling including mini-horizontal directional drilling, guided boring, auger boring, pipe jacking, microtunneling, and river crossing. The composition mixed with an aqueous medium provides a water-based drilling mud applicable to trenchless directional drilling in an unconsolidated formation and particularly in an environment contaminated with salty water such as sea water. The composition contains a mixture of about 91 to 98 % by weight of Wyoming bentonite, about 1 to 8 % by weight of carbonate salt of alkali metal, and about 0.5 to 4 % by weight of a selective xanthan biopolymer.

L'invention concerne une composition comprenant de l'argile gonflant à l'eau, et notamment une argile montmorillonite de sodium telle que la bentonite, le carbonate de sodium et un biopolymère soluble dans l'eau, et notamment un biopolymère de xanthane. La composition, mélangée à l'eau douce, forme une boue de forage aqueuse, possédant des propriétés de fluide souhaitables telles qu'un profil élevé de résistance du gel de 10 secondes/10 minutes/30 minutes et une faible perte de fluide de degré Api, et s'utilisant dans le forage directionnel sans tranchée tel que le forage directionnel mini-horizontal, le forage guidé, le forage à la tarière, le levage de tuyaux, le micropercement de tunnel et la conduite sous-fluviale. La composition mélangée à un milieu aqueux permet d'obtenir une boue de forage à base d'eau pouvant être utilisée dans le forage directionnel sans tranchée dans une formation non consolidée et notamment dans un environnement contaminé par l'eau salée telle que l'eau de mer. Cette composition contient un mélange d'environ 91 à 98 % en poids de bentonite du Wyoming, environ 1 à 8 % en poids de sel de carbonate de métal alcalin et environ 0,5 à 4 % en poids d'un biopolymère de xanthane sélectif.

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