Over-bit reamer
US10301880B2 · kind B2 · utility
5Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2016 |
| Grant date | May 28, 2019 |
| Priority date | — |
| Expiry date | May 8, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/327
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An over-bit backreamer. The backreamer is configured to be placed over a bit without detaching the hit from a drill string associated with a pilot bore. The backreamer has an internal surface that conforms to a steering surface of the hit. Rotation is transferred from the bit to the backreamer at the internal surface. The backreamer further defines a flange which interacts with a feature, such as a heel, on the bit. The flange and heel form a shoulder which transfers pullback force to the bit. The backreamer comprises a pullback eye that pulls a product pipe back through the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.