Rheologically-stable water-based high temperature drilling...

Details Rheologically-stable water-based high temperature drilling... Rheologically-stable water-based high temperature drilling...

C - Chemistry, Metallurgy

09

K

31/26

C09K 8/20 (2006.01)

Patent

CA 2035737

ABSTRACT A water-based fluid for use in the drilling of wells is disclosed. This fluid: is rheologically stable over a wide temperature range, from room temperature to at least about 475°F., thus reducing drilling time in high temperature applications; typically necessitates minimal disposal rates in operation; is resistant to temperature-induced carbonate gellation; creates a thin filter case; and combines the low toxicity of a water-based fluid with the performance stability of an oil-based fluid. As further disclosed herein, this drilling fluid comprises a water-based colloidal suspension of certain readily available drilling fluid components, including clay, parenchymal cell cellulose ("PCC") and an inorganic salt.

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