FIELD: fluid production, particularly pumping facilities for highly-viscous liquid production from wells.
SUBSTANCE: sucker-rod pump comprises upper piston, upper cylinder, rod string connected to pressure valve, lower cylinder, pusher and sucking valve. Upper cylinder is fixed. Pressure valve is connected to lower sealed piston through pusher. Lower cylinder may move for distance equal to travel of sucking valve having annular locking means installed at upper end of lower cylinder. Annular seat is arranged at lower end of upper cylinder. Sucking valve travel is limited by stop.
EFFECT: increased operational efficiency.
1 dwg
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|---|---|---|---|
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|
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RU2779860C1 |
