Pressure wave noise filter
Abstract
Abstract AN ILLUSTRATIVE EMBODIMENT OF THE PRESENT INVENTION IN PRESSURE PULSE SIGNAL DETECTING SYSTEMS FOR USE IN DETECTING DOWNHOLE DATA TRANSMITTED TO THE SURFACE IN THE FORM OF ENCODED PRESSURE PULSES IN THE DRILLING FLUID FLOW LINES WHILE DRILLING A WELL, INCLUDES A NOISE FILTER FOR ENABLING DETECTION OF SUCH PULSES IN THE PRESENCE OF NOISE DUE TO THE MUD PUMP. THE NOISE FILTER INCLUDES A DIFFERENTIAL PRESSURE SENSOR HAVING OPPOSITE FLUID PRESSURE INPUTS CONNECTED TO SPACED POINTS IN A FLOW LINE BY MEANS PROVIDING EQUAL TRAVEL TIMES TO OPPOSITE INPUTS OF THE SENSOR FOR PRESSURE PULSES DUE TO THE PUMP, BUT PROVIDING UNEQUAL TRAVEL TIME TO OPPOSITE SENSOR INPUTS FOR PRESSURE PULSE SIGNALS ARRIVING FROM A DOWNHOLE SIGNALLING DEVICE. THIS ENABLES THE PUMP NOISE TO BE EFFECTIVELY CANCELLED WHILE THE DOWNHOLE SIGNALS ARE DETECTED.
Inventors
- 👤 Roger Q Fields
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |