Swab hoist use thereof in conveying crude oil and natural gas

Details Swab hoist use thereof in conveying crude oil and natural gas Swab hoist use thereof in conveying crude oil and natural gas

1981-08-07

1984-06-19

Novosad, Stephen J.

Wells

Automatic

166 72, 166385, 254361, E21B 3710

Patent

active

044549121

ABSTRACT:
The invention relates to a swab hoist for use in conveying crude oil and natural gas having a cable drum and a driving motor for the cable drum.
It is the object of the invention to provide a swab hoist of improved properties.
This is achieved according to the invention by providing a hydraulic drive for the transmission of force from the driving motor to the cable drum. The hydraulic drive consists of a hydraulic pump driven by the driving motor, a hydraulic motor connected to the cable drum and a control means, in particular a pressure-reducing means, all connected to one another by means of pressure lines.

REFERENCES:
patent: 2625835 (1953-01-01), Marek
patent: 3606256 (1971-09-01), Ouretveit
patent: 4024913 (1977-05-01), Grable
patent: 4148464 (1979-04-01), Fog et al.
patent: 4169580 (1979-08-01), Hatlapa et al.
patent: 4227680 (1980-08-01), Hrescak
Prospectus, Wilson Mfg. Co., pp. 7603-7615.

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