Method for cementing in a formation subject to water influx
US5484019A · kind A · utility
90Cited by
5References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Nov 21, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/74
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is presented for cementing conductor pipes in well bores in water depths greater than 1000 feet. The method is accomplished by formulating the cement slurry from Portland cement, a foaming surfactant, a quantity of fine particle size cementitious material and nitrogen or other gas to foam the slurry to yield a density of from about 9.0 to about 14 lbs/gal. The slurry is introduced down the conductor pipe and permitted to return up the annulus of the well bore to the seafloor. The slurry develops a static gel strength in excess of about 500 lbf/100 ft.sup.2 within less than about 30 minutes after placement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.