Drilling and hole enlargement device
US7506703B2 · kind B2 · utility
34Cited by
40References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2006 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Sep 1, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An expandable drilling apparatus is deployed upon a distal end of a drillstring and includes a cutting head and a substantially tubular main body adjacent the cutting head providing a plurality of axial recesses configured to receive arm assemblies configured to translate between a retracted and an extended position. A flow switch actuates the arm assemblies when a drilling fluid pressure exceeds an activation value and the drilling apparatus includes a biasing member to reset the arm assemblies when the drilling fluid pressure falls below a reset value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.