Power section and transmission of a downhole drilling motor
US9546518B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2015 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Feb 25, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Power section and transmission components within a downhole drilling motor that may reduce or eliminate axial thrust loads on the transmission of the drilling motor are provided. The transmission may utilize a driven shaft coupled between two connectors that enable torque transfer to and from the transmission while allowing the driven shaft to move freely in two planes. The power section may include a rotor with a through bore and a flex-shaft disposed in the through bore. The flex-shaft may be designed to rotate with the rotor. The flex-shaft may extend beyond the length of the rotor in one direction to be centralized within a bearing assembly. The opposite end of the flex-shaft may include a load-carrying shoulder that is retained in the bottom end of the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.