Drilling fluid, apparatus, and method

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/10 (2006.01) C09K 8/20 (2006.01) C09K 8/32 (2006.01)

Patent

CA 2458999

Disclosed are drilling fluids suitable for use in connection with oil well drilling. The drilling fluids of the invention include in one embodiment a liquid base, an alkyl glucoside, such as methyl glucoside, and a borehole stability promoter that includes a maltodextrin, a carboxyalkyl starch, a hemicellulose-containing material, or a mixture of the foregoing. In another embodiment, the drilling fluid includes a liquid base and molasses solids, preferably in combination with an alkyl glucoside and more preferably in further combination with one of the aforementioned borehole stability promoters. The drilling fluids of the invention surprisingly have a reduced tendency to swell shale as compared with known drilling fluids. Also disclosed are a drilling apparatus and process. The drilling apparatus includes a drill string, which may be conventional, that is fluidically coupled to a source of drilling fluid, the source of drilling fluid including the drilling fluid of the invention. The process of the invention includes the step of circulation the drilling fluid of the invention through a drill string during borehole drilling.

Cette invention se rapporte à des fluides de forage conçus pour être utilisés en association avec le forage de puits de pétrole. Ces fluides de forage contiennent, dans un mode de réalisation, une base liquide, un glucoside d'alkyle, tel que du glucoside de méthyle, et un promoteur de stabilité de trou de forage qui contient une maltodextrine, un amidon de carboxyalkyle, un matériau contenant de l'hemicellulose ou un mélange de ceux-ci. Dans un autre mode de réalisation, le fluide de forage contient une base liquide et des molasses solides, associées de préférence à un glucoside d'alkyle et plus préférablement également associées à l'un des promoteurs de stabilité de trou de forage mentionnés ci-dessus. On a découvert de façon surprenante que ces fluides de forage ont une tendance réduite à gonfler le schiste, par rapport aux fluides de forage connus. Cette invention concerne également un appareil et un procédé de forage. Cet appareil de forage contient une colonne de forage, qui peut être de type traditionnel, et qui est couplée en communication fluidique avec une source de fluide de forage, cette source de fluide de forage contenant le fluide de forage faisant l'objet de cette invention. Le procédé de forage de cette invention consiste à mettre le fluide de forage de cette invention en circulation à travers une colonne de forage pendant le forage du trou de forage.

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