High-speed triple string drilling system
US8739902B2 · kind B2 · utility
1Cited by
47References
30Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2013 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Mar 14, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling system for boring into ground includes a bottom hole assembly having a rotatable casing shoe, an independently rotatable driveshaft disposed within the casing shoe, and a bearing housing interdisposed between the driveshaft and the casing shoe to control a distance between a centerline of the driveshaft and a centerline of the casing shoe. The driveshaft includes a bit disposed at a distal end thereof, extending beyond the casing shoe distal end. The driveshaft centerline and the casing shoe centerline are substantially parallel and radially offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.