Drilling torsional friction reducer
US5339910A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1993 |
| Grant date | Aug 23, 1994 |
| Priority date | — |
| Expiry date | Apr 14, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1092
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Rotary drag during drilling is reduced by 1) adding roller bearings to a tubular string and drill bit, and/or 2) adding a bearing assembly to the tubular string, and/or 3) adding a rotary discoupling tool to the tubular string. At the drill bit, this is achieved by miniature rollers built into the gauge section. Along the drill string periodic roller bearings or bearing standoff assemblies are placed along the string length and/or a rotary discoupling tool capable of sealing fluid and transmitting compression and tensile loads is placed in the string. The combination minimizes bit whirl and rotational drag, especially during the drilling of extended reach wellbores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.