Drilling a borehole

Details Drilling a borehole Drilling a borehole

C - Chemistry, Metallurgy

09

K

31/23

C09K 8/24 (2006.01)

Patent

CA 1096154

K 5833 A B S T R A C T The cost of drilling a water sensitive shale is reduced by first enhancing drilling rate by circulating a clear drilling fluid, then avoiding borehole instability due to shale-water interaction by circulating an aqueous solution of 10-20% hydrolyzed polyacrylamide and alkali metal halide. Borehole instability due to mechanical incompetence of earth formations may be avoided by circulating a suspension of pre-hydrated bentonite in the said solution to enhance the borehole cleaning while continuing the shale stabilization.

295815

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