Expandable drill bit
US7410015B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 2006 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Oct 17, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/32
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An expandable drill bit comprises a body for mounting on a support string DS, a plurality of drill arms 3A, 3B, 3C, 3D, 4A, 4B, 4C, 4D coupled to the body and extending along a central longitudinal axis LL′, and at least one drill arm supporting cutting elements 6A. The plurality of drill arms 3A, 3B, 3C, 3D, 4A, 4B, 4C, 4D are pivotable between a retracted configuration and an expanded configuration. The retracted configuration defines an expandable drill bit having a first cutting diameter D1. The expanded configuration defines an expandable drill bit having a second cutting diameter D2 greater than the first cutting diameter. The drill arms 3A, 3B, 3C, 3D, 4A, 4B, 4C, 4D are driven from the retracted configuration into the expanded configuration when the expandable drill bit is rotated at a speed of rotation at least equal to a determined expanding speed of rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.