Casing drilling shoe
US6443247B1 · kind B1 · utility
133Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 20, 2001 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Feb 20, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/103
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A casing drilling shoe adapted for attachment to a casing string and comprising an outer drilling section constructed of a relatively hard material such as steel and an inner section constructed of a readily drillable material such as aluminum. The drilling shoe further includes a device for controllably displacing the outer drilling section to enable the shoe to be drilled through using a standard drill bit and subsequently penetrated by a reduced diameter casing string or liner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.