Bearing system for a downhole motor
US4361194A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1980 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Sep 30, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/003
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved bearing system for the driven shaft of a downhole motor is shown that provides a main thrust and radial bearing system having means for sealing the bearings in oil at equal or slight pressure above that of the drilling mud inside the drill pipe and insulating the fluid seals and bearings from all possibility of contact with cuttings and debris from the drilling operation. A durable seal having a restricted flow path permitting slow leakage is positioned below the main bearing system in such a relationship to the drilling fluid distribution path that the seals for the oil bath for the bearings are subjected to essentially the same pressure on all sides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.