Dry cement formulation for cementing holes in the earth
US8393391B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2007 |
| Grant date | Mar 12, 2013 |
| Priority date | — |
| Expiry date | Jul 7, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B24/2676
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention pertains to a dry cement formulation for cementing earth boreholes, in particular oil, gas and/or terrestrial heat boreholes, containing a) about 20 to 99.9 wt. % cement, b) about 0 to 65 wt. % powdered quartz/or quartz dust, c) about 0.1 to 30 wt. % water-redispersible dispersion powder, and d) about 0 to 20 wt. % further additives. Furthermore, the invention pertains to the use of the dry cement formulation for preparing a cement slurry as well as to the use of water-redispersible dispersion powders in a cement slurry for cementing earth boreholes, wherein the cement slurries can be used for reducing the water loss of the cement slurry, for reducing the gas and/or water penetration and/or for sealing off the gas and/or water channels by means of the cement slurry which has been introduced into the borehole and has set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.