Wells – Processes – Producing the well
Patent
1985-02-11
1986-12-16
Novosad, Stephen J.
Wells
Processes
Producing the well
166170, 417 56, 417 58, F04B 4712, E21B 4300
Patent
active
046290044
ABSTRACT:
A plunger lift is adapted to be disposed in a well tubing string for slidable movement in relation to the tubing string in response to lift pressure. The plunger lift is an integral, one-piece unit that comprises a generally cylindrical, elongated shaft having an external, spirally extending coil machined in fixed relation to the external surface of the shaft. The spiral coil is disposed on the shaft such that an oblique angle is formed by the coil and a line perpendicular to the shaft. The coil is defined by a radially and outwardly projecting web terminating in an outer rim which is directed downwardly in an axial direction away from the web to form an undercut or recessed portion beneath the web. The coil traverses the major length of the shaft for advancement of well fluids therealong. A choke passage is provided in the shaft so that fluid is able to pass upwardly through the plunger lift for the selective withdrawal of fluids from the upper end of the coil.
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Bagnell David J.
Novosad Stephen J.
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