Downhole progressive cavity type drilling motor with flexible connecting rod
US4679638A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1985 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Dec 27, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C15/0076
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A downhole motor has a rotor and a stator, of the progressive cavity type, inside a housing. A bearing shaft is mounted within the housing, with a bearing between the housing and the bearing shaft, and the bearing shaft is rotatable about the longitudinal axis of the bearing shaft and the housing. A flexible rod, with a connection on each end, extends between the rotor and the bearing shaft, for translating the rotation and gyration of the rotor to the true rotation of the bearing shaft. A cylindrical overload sub is located concentrically around the rod. A plurality of splines and slots on the connections engage a plurality of splines and slots on the sub to allow the connections to rotate axially a limited amount in relation to one another. Teeth may be used instead of splines and slots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.