High temperature well cement compositions and methods
US5184680A · kind A · utility
42Cited by
16References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/763
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Improved set retarded cement compositions and methods of using such compositions which are substantially non-thinning at high temperatures and which can include fresh or salt water are provided. The compositions are comprised of hydraulic cement, sufficient water to form a pumpable slurry, a set retarder and a delayed viscosifying agent which yields viscosity at high temperatures comprised of a treated depolymerized galactomannan gum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.