Fluid loss control in oil field cements
US4659750A · kind A · utility
8Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1985 |
| Grant date | Apr 21, 1987 |
| Priority date | — |
| Expiry date | Jun 4, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/46
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An aqueous slurry which comprises (a) a cement; (b) about 0.05 to 5.0 wt. % of a copolymer of N-vinylpyrrolidone and a salt of styrenesulfonic acid based on the dry weight of said cement; (c) about 0.05 to 5.0 wt. % of a formaldehyde condensed naphthalene-sulfonic acid salt based on the dry weight of said cement; and (d) water, said cement, said copolymer and said dispersant being dispersed in said water to form said aqueous slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.