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Abstract

Aqueous drilling and reservoir fluids are provided comprising polymers with shale and clay inhibition characteristics. These polymers are dissolved in the fluid and are formed from 50 to 100 mo % monomers of formula (I), wherein R.sup.1 is selected from H and C.sub.1 to C.sub.4 alkyl groups; R.sup.2 is selected from C.sub.1 to C.sub.4 alkyl groups, --C(CH.sub.3).sub.2 CH.sub.2 COCH.sub.3, --CH.dbd.CH.sub.2 and --C(CH.sub.3).dbd.CH.sub.2. R.sup.3 is selected from H, C.sub.1 to C.sub.4 alkyl groups, CH.sub.2 .dbd.CH-- and CH.sub.2 .dbd.C(CH.sub.3)--; wherein when R.sup.3 is H or C.sub.1 to C.sub.4 alkyl then R.sup.1 is H and R.sup.2 is --CH.dbd.CH.sub.2 or --C(CH.sub.3).dbd.CH.sub.2 and when R.sup.2 is --C(CH.sub.3).sub.2 CH.sub.2 COCH.sub.3 then R.sup.1 is H; 0 to 50 mol % other ethylenically unsaturated non-ionic monomers and 0 to 20 mol % ionic ethylenically unsaturated monomers and the polymer has a molecular weight of below 1 million.

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