High temperature lightweight foamed cements
US4871395A · kind A · utility
45Cited by
11References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1987 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Sep 17, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/473
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.