Drilling fluid, apparatus, and method

Details Drilling fluid, apparatus, and method Drilling fluid, apparatus, and method

C - Chemistry, Metallurgy

09

K

C09K 8/34 (2006.01) C09K 8/08 (2006.01) C09K 8/10 (2006.01) C09K 8/20 (2006.01) E21B 7/00 (2006.01)

Patent

CA 2354894

Disclosed are drilling fluids suitable for use in connection with oil well drilling. The drilling fluids of the invention include a liquid base, an alkyl glucoside, such as methyl glucoside, and a borehole stability agent that includes a maltodextrin, a carboxyalkyl starch, a hemicellulose-containing material, or a mixture of the foregoing. The drilling fluids of the invention surprisingly have a reduced tendency to swell shale as compared with drilling fluids that do not include hemicellulose or maltodextrin. 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.

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