Well fluid for in-situ borehole repair
US5309997A · kind A · utility
8Cited by
68References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1992 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Oct 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for consolidating incompetent formations penetrated by a borehole using drilling fluids. The method uses a water-based drilling fluid the solids contents of which includes microfine-ground blast furnace slag. This provides a fluid that will penetrate the incompetent formation and harden in place to consolidate the formation. Subsequent cementing with a cementitious slurry comprising water, activator and normally-ground blast furnace slag results in a compatible cement which will adhere to filter cake from the drilling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.