Patent Number: 6,167,912

Title: Method and composition for grouting water-flooded conduits

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.

Inventors: Stephens; Patrick J. (Bellingham, WA)


International Classification: F16L 55/16 (20060101); F16L 55/175 (20060101); F16L 055/164 ()

Expiration Date: 01/02/2018