| 摘要 |
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 mol % monomers of formula (I), wherein R 1 is selected from H and C 1 to C 4 alkyl groups; R 2 is selected from C 1 to C 4 alkyl groups, -C(CH* small Greek omega *)* small Greek eta *CH* small Greek eta *COCH 3 , -CH = CH* small Greek eta * and -C(CH* small Greek omega *) = CH* small Greek eta *. R. is selected from H, C 1 to C 4 alkyl groups, CH* small Greek eta * = CH- and CH 2 = C(CH* small Greek omega *)-; wherein when R. is H or C 1 to C alkyl then R 1 is H and R is -CH = CH* small Greek eta * or -C(CH* small Greek omega *) = CH 2 and when R is - C(CH* small Greek omega *)* small Greek eta *CH 2 COCH 3 then R 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. |
