Well cement fluid loss additive and method
US5009269A · kind A · utility
32Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1990 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Jul 31, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/46
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A fluid loss additive for addition to a cement slurry used in cementing a casing string in a wellbore. The additive reduces loss of water from the slurry into the formation, resulting in a better cement job. The additive is comprised of partially hydrolyzed polyvinyl acetate polymer, calcium sulfate, a crosslinker for the polymer, and optionally a defoamer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.