Hydrolytically stable polymers for use in oil field cementing methods and compositions
US4515635A · kind A · utility
194Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1984 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Mar 23, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/487
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate certain copolymers of N, N dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid having mole ratios of between 1:4 and 4:1 respectively and average molecular weights of between about 75,000 and about 300,000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.