Lightened cement grout suitable for the cementation of hydrocarbon production wells
US5207832A · kind A · utility
32Cited by
8References
28Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 11, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Oct 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to a lightened gas-impermeable cement grout which comprises hydraulic cement, water, silica fumes in an amount of from about 5 to about 65 weight % based on the weight of the cement, and at least one polyethylene imine having a molecular weight of between about 600,000 and about 1,000,000 in an amount of from about 1 to about 25% weight % based on the weight of the water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.