Wells – With below and above ground modification – Eduction pump or plunger in well
Patent
1981-12-04
1984-07-31
Novosad, Stephen J.
Wells
With below and above ground modification
Eduction pump or plunger in well
166 87, 166372, 91 50, E21B 4300
Patent
active
044624646
ABSTRACT:
A wellhead assembly especially suited for oil wells has a wide working pressure range and employs three components which fit together to seal the well casing, hold the tubing against high wellhead pressures, and provide a connection to the tubing through which the sucker rods are operated. The primary casing seal is formed by the mating contact of metal surfaces that are not subject to deterioration. The actuator for the subsurface pump is a vertically disposed hydraulic cylinder unit aligned with the sucker rods and forming the uppermost section of an elongated cylindrical housing, which also has a lowermost section on the wellhead that provides the outlets for the fluid pumped from the well, and an intermediate, control section that contains a spool valve for controlling the hydraulic actuator. The spool is shifted by the piston and rod of the hydraulic actuator at the upper and lower limits of their stroke to thereby reciprocate the sucker rods and operate the subsurface pump.
REFERENCES:
patent: 1926856 (1933-09-01), Leman
patent: 2003446 (1935-06-01), Imler et al.
patent: 2475429 (1949-07-01), Hamason
patent: 2869469 (1959-01-01), Williams
patent: 2874641 (1959-07-01), McCandlish et al.
patent: 3212406 (1965-10-01), McDuffie
patent: 3643432 (1972-02-01), Klaeger
Brown Harold D.
Brown Mark A.
Rohling Leon J.
Brown Harold D.
Chase D. A. N.
Neuder William P.
Novosad Stephen J.
Yakimo, Jr. Michael
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