Servo-driven mud pulser
US6016288A · kind A · utility
73Cited by
56References
34Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1996 |
| Grant date | Jan 18, 2000 |
| Priority date | — |
| Expiry date | Jul 25, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved servo-driven pulser is disclosed, for use in measurement while drilling applications. In the pulser, a battery powered on-board DC electric motor is used to operate a servo-valve, which in turn adjusts internal tool fluid pressures to cause operation of a main valve to substantially reduce mud flow to a drill bit, thereby creating a positive pressure pulse detectable at the surface. De-energizing the motor driving the pilot valve results in re-adjustment of internal fluid pressures, causing the main valve to reopen, thereby terminating the pressure pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.