Wells – With motor for rotary or oscillating motion
Patent
1986-05-09
1987-05-26
Novosad, Stephen J.
Wells
With motor for rotary or oscillating motion
277135, E21B 4100, F16J 1540, F16J 1554
Patent
active
046677372
ABSTRACT:
A sealing apparatus having particular utility in a submersible electric motor utilized in subterranean wells comprises a tubular housing assembly securable in upwardly projecting, sealed relationship to the motor housing. An extension of the motor shaft projects upwardly through the tubular housing to drive a pump or other subterranean well tool. The upper end of the extension shaft is exposed to well fluids and a first shaft seal is mounted in a seal mounting chamber defined in the upper end of the tubular housing assemblage. Below the seal mounting chamber, the tubular housing assemblage defines a diaphragm chamber. A conduit is provided between the lower portions of the seal mounting chamber and the lower portions of the diaphragm chamber. A flexible, annular diaphragm divides the diaphragm chamber and is exposed on its exterior to well fluids, and on its interior to a light density motor protective fluid, thus equalizing any pressure differential between the motor protective fluid and the external well fluids. The diaphragm chamber is connected at its upper end to a downwardly extending axial passage surrounding the motor shaft and communicating with the interior of the motor housing.
REFERENCES:
patent: 1893921 (1933-01-01), Wintroath
patent: 2305648 (1942-12-01), Van Horn
patent: 2354874 (1944-08-01), Myers
patent: 2379648 (1945-07-01), Myers
patent: 2881013 (1959-04-01), Myers
patent: 3889983 (1975-06-01), Frieze et al.
patent: 4260167 (1981-04-01), Fox
Shaw James G.
Shore John H.
Baker Oil Tools, Inc.
Novosad Stephen J.
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