Patent ID: 9574126
Date: 2017-02-21
CPC Classifications: C09K

Claim:
1. An aqueous based drilling fluid composition consisting of: i) an aqueous based continuous phase; ii) a reactive clay or shale material; iii) a shale hydration inhibition agent selected from: 2-methoxy-1-aminoethane, 2-ethoxy-1-aminoethane, 2-propoxy-1-aminoethane, 2-butoxy-1-aminoethane, 1-methoxy-2-aminopropane, 1-ethoxy-2-aminopropane, 1-propoxy-2-aminopropane, or 1-butoxy-2-aminopropane; wherein the shale hydration inhibition agent is present in an amount of 1 to 18 pounds per barrel (2.85 kg/m and iv) optionally one or more of a fluid loss control agent, a weighting material, a viscosifying agent, a dispersant, a lubricant, a corrosion inhibitor, a defoamer, or a surfactant.