Water soluble copolymers containing vinyl imidazole as drilling fluid additives
US4471097A · kind A · utility
Inventors
Key dates
| Filing date | Jan 11, 1982 |
| Grant date | Sep 11, 1984 |
| Priority date | — |
| Expiry date | Jan 11, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/936
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Auxiliary agents for chemical flooding of petroleum deposits and auxiliary agents used in well drilling fluids are water-soluble copolymers containing a statistical distribution of PA1 (a) 5 to 95% by weight of structural units of formula I ##STR1## (b) 0 to 30% by weight of structural units of formula II ##STR2## (c) 0 to 80% by weight of structural units of formula III ##STR3## (d) 5 to 60% by weight of structural units of formula IV ##STR4## wherein R.sup.1 and R.sup.2 are the same or different and represent hydrogen, methyl, or ethyl or together are trimethylene to cyclic pentamethylene; PA1 R.sup.3 represents hydrogen or methyl; PA1 R.sup.4 represent a imidazolyl-(1) or imidazolyl-(2) moiety; PA1 Y is a single covalent bond or the formula --CO--NH--C(CH.sub.3).sub.2 --CH.sub.2 --; and PA1 X.sup.+ is a cation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.