aqueous based drilling fluid composition and method for reducing reactivity of clays and shale

摘要

Summary "aqueous-based drilling fluid composition and method for reducing clay and shale reactivity" clay and shale hydration in drilling operations may be inhibited by employing an aqueous-based drilling fluid comprising the formula: (formula i shall be where r is hydrogen or an alkyl group having 1 to 12 carbon atoms, r1 is an alkyl group having 1 to 12 carbon atoms, and r2 is an alkyl group having 1 to 12 carbon atoms. the shale hydration inhibiting agent should be present in the aqueous based drilling fluid in sufficient concentration to reduce reactivity, such as swelling, of clays and shale when exposed to water based drilling fluids. 1/1