Polymers for drilling and reservoir fluids and their use
US6020289A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1998 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Feb 24, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.