Bore hole grouting apparatus and method
US6371205B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Mar 2, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B27/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The grouting apparatus includes a tubular body, an outer end closure removably mounted to the outer end of the tubular body and a nozzle mounted to the inner end of the tubular body to form a container for grouting material. The tubular body has a landing shoulder seatable on a drill string landing shoulder. The closure includes an overshot coupling member and a head having an inlet passage opening to the tubular body. A piston and a sleeve are axially movable in the tubular body to force the grouting material out of the container, the sleeve blocking flow through the piston as the piston moves inwardly, but after abutting against the nozzle, opening a bypass channel from outwardly of the piston, through the piston and to the nozzle tube. Upon the sleeve moving inwardly relative to the piston, the fluid outwardly of the container may be pumped through the container to mix with the grouting material that was dispensed into the container prior to the container being inserted into the drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.