C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/26
C09K 8/10 (2006.01) E21B 21/00 (2006.01)
Patent
CA 1097904
SHALE STABILIZING DRILLING FLUID ABSTRACT OF THE DISCLOSURE A process and composition are described for use in drilling shale and especially in drilling the troublesome types of shale which heretofore have been impossible to drill effectively. The aqueous drilling fluid of this invention so effectively stabilizes the shale that additions to maintain the special drilling fluid can be discon- tinued or drastically reduced, once the shale formation has been pene- trated and drilling below the shale could even be done with conventional drilling fluids. The drilling fluid contains between about 0.2 to 1.5 pounds per barrel of flaxseed gum together with potassium and/or ammonium salts. The potassium and/or ammonium salts are used in quantities to provide a concentration of the cation of the salt of at least 10,000 ppm. As the drilling fluid is a non-clay type, a non-clay viscosifier is used. Preferably, the cation concentration is tailored to drilling fluid salinity such that the cation concentration in parts per million is approximately equal to at least 10,000x(1+0.025x the sodium chloride salinity in percent saturation).
320102
Anderson Duane B.
Edwards Carl D.
Gowling Lafleur Henderson Llp
Standard Oil Company
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