Process and composition for drilling shale formation in sea...

Details Process and composition for drilling shale formation in sea... Process and composition for drilling shale formation in sea...

C - Chemistry, Metallurgy

09

K

31/19

C09K 8/20 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1050255

- 1 - PROCESS AND COMPOSITION FOR DRILLING SHALE FORMATION IN SEA WATER Abstract of the Disclosure A process and composition for drilling a well through shale formation in sea water with an aqueous drilling mud comprising a clay - sea water slurry con- taining a potassium salt of lignosulfonate. The ligno- sulfonate is prepared by reaction of potassium hydroxide or a salt of sulfurous acid with spent sulfite liquor at elevated temperatures. A particularly effective drilling composition also contains hydroxy acids and up to 4% based on total solids content of the lignosulfon- ate, of an iron complex.

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