Method and composition for grouting water-flooded conduits
US6415824B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 2, 2001 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Jan 2, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/175
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method and composition for grouting a water-flooded cavity. Water and portland cement are combined to form a fluid cement slurry, the slurry being substantially free of sand or other aggregate material, and the slurry is then colloidally mixed so as to achieve an ultra-fine mixing thereof. An anti-washout admixture is mixed with the slurry in a predetermined amount, and a superplasticizing agent is also preferably included, both the anti-washout admixture and the superplasticizer agent being substantially free of defoaming agents. Finished foam is then mixed with the slurry to form a stable foamed cement grout which is injected into the water-flooded cavity. The anti-washout admixture is preferably a modified cellulose ether solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.