Casing tube with casing shoe
US5813484A · kind A · utility
6Cited by
6References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A casing tube formed from plastic and a casing shoe formed from metal are provided for drilling in layers of earth or rock. The casing shoe is locked to the casing tube by threads, grooves or flanges provided on a reduced diameter portion of the casing shoe. A tube-formed extension is provided in the casing shoe for protecting the casing tube from damage during a drilling operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.