Bearing system for a downhole motor
US4577704A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1980 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Sep 15, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S415/903
- 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.