Guide tube of a drill string configured to facilitate unscrewing thereof from a member of the drill string
US6681875B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2001 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | Jan 16, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/0426
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A guide tube for use in a rock drill string includes a main portion, a sleeve disposed at a first end of the main portion, and a male thread portion disposed at a second end of the main portion. The sleeve forms a recess having a female thread. A flush channel extends through the guide tube. The main portion includes a section of reduced cross-section disposed adjacent the sleeve for defining a generally radially extending shoulder between the waist and the sleeve. The shoulder serves to support the guide tube on a rig as percussion is applied to the guide tube for loosening a threaded joint between the guide tube and another member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.