Patent US3671786A successfully refreshed from Google Patents.
US3671786A
Expired / Lapsed
US
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Motor and seal section utilizing a fluorinated ether as a single, homogenous, blocking cooling and lubricating fluid
Assignee: Centrilift Hughes Inc
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Filing: 1970-07-06
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Granted: 1972-06-20
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Expires: 1990-07-06
Abstract
Abstract A submersible motor and seal section containing a homogeneous lubricating and cooling fluid which, in addition, concurrently blocks the entry of ambient well fluid into the motor. The seal section is in fluid communication with the motor and with the ambient well environment. It accommodates thermal expansion and contraction of the lubricating and cooling fluid experienced due to the intermittent operation of the motor. The fluid possesses essential properties of thermal conductivity, dielectric strength, lubricity, compatability with other motor component materials, and immiscibility with well fluid to provide lubrication and cooling of the motor and effective resistance to contamination by ambient well fluid.
Inventors
- 👤 Johnny W Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:00
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/10; C; C10; C10M; C10M107/00; C10M107/38; F04D13/083; H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/132; H02K9/00; H02K9/19; C10M2213/00; C10M2213/04; C10M2213/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A submersible pump motor and seal section including a longitudinally elongated electric motor including a stator, a rotor rotatably supported with respect to said stator, said rotor including a shaft extending longitudinally outward of said motor, a seal section surrounding said shaft and connected in fluid tight relation to said motor, said seal section including at least one rotary seal disposed in sealing engagement with said shaft, said seal section defining, between said motor and said rotary seal, at least one hollow chamber in fluid communication with said motor and with the ambient well environment, and a single homogenous lubricating, cooling and blocking fluid filling said motor and at least a portion of said seal section chamber, said fluid being essentially immiscible with ambient well fluid to block ingress of well fluid into said seal section, and being effective to provide lubrication and cooling of said motor wherein said single homogenous fluid is a fluorinated ether which has a specific gravity greater than one.
Claim 2
Dependent Claim
164 words
A submersible pump motor and seal section including a longitudinally elongated electric motor including a stator, a rotor rotatably supported with respect to said stator, said rotor including a shaft extending longitudinally outward of said motor, a seal section surrounding said shaft and connected in fluid tight relation to said motor, said seal section including at least one rotary seal disposed in sealing engagement with said shaft, said seal section defining, between said motor and said rotary seal, at least one hollow chamber in fluid communication with said motor and with the ambient well environment, and a single homogenous lubricating, cooling and blocking fluid filling said motor and at least a portion of said seal section chamber, said fluid being essentially immiscible with ambient well fluid to block ingress of well fluid into said seal section, and being effective to provide lubrication and cooling of said motor wherein said single homogenous fluid is a fluorinated ether which has a specific gravity greater than one.
Claim 3
Dependent Claim
26 words
A submersible pump motor and seal section as claimed in claim 1 wherein said single homogeneous fluid is a fluorinated ether having a chemical composition of
Claim 4
Dependent Claim
127 words
A submersible pump motor and seal section as claimed in claim 1 wherein said fluorinated ether possesses a breakdown voltage of about 49 KV (rms), liquid, ASTM D 877, 0.1 inch gap between planes 1 atmosphere, 25* C., a boiling point of about 435.6* F., a specific gravity at 77* F. of about 1.79, a solubility in water at 77* F. of less than 25 ppm., a negligible solubility of water at 77* F., a solubility in Sunoco AHT transformer oil at 77* F. of less than 1 percent, a solubility of Sunoco AHT transformer oil at 77* F. of less than 1 percent, a thermal conductivity at 77* F. of about 0.0387 Btu/(hr)(ft)* F.), and a viscosity at 77* F. of about 0.5 to 0.7 Cp.
Claim 5
Dependent Claim
98 words
A submersible pump motor and seal section as claimed in claim 1 wherein said single homogeneous fluid possesses a dielectric strength of about at least 30 KV per one-tenth inch at 80* C., a maximum operating temperature above 250* F., a coefficient of friction of at least 0.020 at 70* F., 400 RPM and a 100 lb. load, a specific gravity greater than 1.00 at 77* F., a viscosity of about 95 Saybolts at 100* F., a flash point above 350* F., and is immiscible in water and oil with specific gravities of 1 or less than 1.
Claim 6
Dependent Claim
74 words
A submersible pump motor and seal section as claimed in claim 1 wherein said communication between said seal section and said motor is disposed in spaced relation to said communication between said seal section and the ambient well environment and the volume of said single homogeneous cooling, lubricating and blocking fluid in said seal section is greater than the change in volume of said fluid in said motor during on-and-off cycling of the motor.
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |