Hydrolytically stable polymers for use in oil field cementing methods and compositions
US4555269A · kind A · utility
237Cited by
3References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 20, 1985 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Feb 20, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2201/10
- 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 and copolymer salts 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.