Compressive seal and pressure control arrangements for downhole tools
US5067874A · kind A · utility
26Cited by
17References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1990 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Apr 13, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S415/903
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosure relates to downhole drilling motors which include seal arrangements and pressure control assemblies for staging the pressure between the two seal assemblies, with each pressure control assembly including a rotary element for displacing a piston, and the piston controlling one or several valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.