US4119865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid sensitive shutdown for well pump
Assignee: International Telephone and Telegraph Corp
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Filing: 1977-08-18
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Granted: 1978-10-10
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Expires: 1997-08-18
Abstract
Abstract A system for disconnecting an oil well pump driving apparatus from a circuit in the absence of a liquid or the like in a pipeline connected from the pump. A vertical member having a cavity in communication with the interior of the pipeline has vertically spaced differential pressure unit (DPU) inlets. The DPU shuts down the pump motor when there is no liquid in the pipeline.
Inventors
- 👤 Peter Platt Elderton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:55
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; F04B49/022
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A fluid sensing system comprising: a unit adapted to pump oil from a well; means actuable to disable said unit; a pipeline connected from said unit to carry oil pumped from said well by said unit; a vertical member sealed to said pipeline, said member having a cavity in communication with the interior of said pipeline; a differential pressure unit (DPU) having low and high pressure inlets in fixed positions relative to said member and responsive to the respective lower and higher pressures in the interior of said cavity respectively above and below each other, said DPU having an output device to actuate said means when the difference between the pressures within said high and low pressure inlets is a predetermined magnitude; and apparatus to override said means when it is appropriate to restart said unit and to fill said pipeline and/or said member.
Claim 2
Dependent Claim
144 words
A fluid sensing system comprising: a unit adapted to pump oil from a well; means actuable to disable said unit; a pipeline connected from said unit to carry oil pumped from said well by said unit; a vertical member sealed to said pipeline, said member having a cavity in communication with the interior of said pipeline; a differential pressure unit (DPU) having low and high pressure inlets in fixed positions relative to said member and responsive to the respective lower and higher pressures in the interior of said cavity respectively above and below each other, said DPU having an output device to actuate said means when the difference between the pressures within said high and low pressure inlets is a predetermined magnitude; and apparatus to override said means when it is appropriate to restart said unit and to fill said pipeline and/or said member.
Claim 3
Dependent Claim
48 words
The invention as defined in claim 1, wherein said unit is electrically operable, said means including a main switch connected from said unit, said DPU causing said main switch to open to disable said unit, said apparatus including an auxiliary switch connected in parallel with said main switch.
References Cited (Backward Citations)
US2550093A
Cited
US3297843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |