US3247712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for measuring low level pressure differential
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1962-12-18
•
Granted: 1966-04-26
•
Expires: 1982-12-18
Abstract
No abstract record available.
Inventors
- 👤 Carlton R Johnson
- 👤 Raynor Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:01
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHOD FOR MEASURING SMALL PRESSURE CHANGES AT A SUBSTANTIAL DEPTH WITHIN A WELLBORE WHICH COMPRISES PACKING A PRESSURE TRANSDUCER WITHIN THE WELLBORE AT THE LEVEL WHERE DIFFERENTIAL PRESSURE ARE TO BE MEASURED; TRANSMITTING A SIGNAL FROM THE TRANSDUCER, INDICATIVE OF ANY PRESSURE IMBALANCE IN THE BOREHOLE, TO A SURFACE CONTROL SYSTEM; METERING FLUID INTO THE UPPER PORTION OF THE BOREHOLE IN RESPONSE TO A RISE OF PRESSURE BELOW THE TRANSDUCER, AND METERING FLUID FROM THE UPPER PORTION OF THE BOREHOLE IN RESPONSE TO A DROP OF PRESSURE BELOW THE TRANSDUCER, WHEREBY A BALANCE OF PRESSURE IS MAINTAINED AT THE TRANSDUCER; AND RECORDING THE VOLUME OF FLUID METERED TO AND FROM THE BOREHOLE, AS A MEASURE OF THE PRESSURE CHANGES BELOW THE TRANSDUCER.
Claim 2
Independent Claim
123 words
A METHOD FOR MEASURING SMALL PRESSURE CHANGES AT A SUBSTANTIAL DEPTH WITHIN A WELLBORE WHICH COMPRISES PACKING A PRESSURE TRANSDUCER WITHIN THE WELLBORE AT THE LEVEL WHERE DIFFERENTIAL PRESSURE ARE TO BE MEASURED; TRANSMITTING A SIGNAL FROM THE TRANSDUCER, INDICATIVE OF ANY PRESSURE IMBALANCE IN THE BOREHOLE, TO A SURFACE CONTROL SYSTEM; METERING FLUID INTO THE UPPER PORTION OF THE BOREHOLE IN RESPONSE TO A RISE OF PRESSURE BELOW THE TRANSDUCER, AND METERING FLUID FROM THE UPPER PORTION OF THE BOREHOLE IN RESPONSE TO A DROP OF PRESSURE BELOW THE TRANSDUCER, WHEREBY A BALANCE OF PRESSURE IS MAINTAINED AT THE TRANSDUCER; AND RECORDING THE VOLUME OF FLUID METERED TO AND FROM THE BOREHOLE, AS A MEASURE OF THE PRESSURE CHANGES BELOW THE TRANSDUCER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |