Low-density and low-porosity cementing slurry for oil wells or the like
US6626991B1 · kind B1 · utility
53Cited by
6References
27Claims
0Family size
Inventors
Key dates
| Filing date | Jul 2, 2002 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Jul 2, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2201/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3 to 1.3 g/cm3, and being constituted by a solid fraction and a liquid fraction, having porosity (volume ratio of liquid fraction over solid fraction) lying in the range 38% to 50%. The solid fraction is constitued by a mixture of lightweight particles, microcement and optionally portland cement and gypsum. Such cements have remarkable mechanical properties due to their very low porosity in spite of having very low density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.