Drilling fluid, apparatus, and method

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/138 (2006.01) C09K 8/08 (2006.01) C09K 8/20 (2006.01) C09K 8/514 (2006.01)

Patent

CA 2463714

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. In another embodiment, the drilling fluid includes sorbitol, preferably in conjunction with a borehole stability promoter. 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 circulating the drilling fluid of the invention through a drill string during borehole drilling.

La présente invention concerne des fluides de forage destinés à être utilisés en relation avec le forage de puits de pétrole. Les fluides de forage selon l'invention comprennent, dans un mode de réalisation, une base liquide, un alkylglucoside, tel que du méthylglucoside, et un promoteur de stabilité de trou de forage qui comprend une maltodextrine, un amidon de carboxyalkyle, un matériau contenant de l'hémicellulose, ou un mélange de ces derniers. Dans un autre mode de réalisation, le fluide de forage comprend une base liquide et des solides de mélasse, de préférence combinés à un alkylglucoside et mieux encore également combinés à l'un des promoteurs de stabilité de trou de forage. Dans un autre mode de réalisation, le fluide de forage comprend du sorbitol, de préférence associé à un promoteur de stabilité de forage. Les fluides de forage selon l'invention présentent, de manière surprenante, une tendance réduite à gonfler l'argile litée comparé aux fluides de forage connus. L'invention concerne également un appareil et un procédé de forage. L'appareil de forage comprend un train de tiges de forage, qui peut être classique, et qui est accouplé en communication fluidique à une source de fluide de forage, la source de fluide de forage comprenant le fluide de forage selon l'invention. Le procédé selon l'invention consiste à faire circuler le fluide de forage selon l'invention dans un train de tiges de forage au cours du forage d'un trou de forage.

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