FIELD: oil production industry, particularly well sucker-rod pump equalizers.
SUBSTANCE: equalizer arranged between rod stem and sucker-rod pump comprises plunger located in cylindrical body filled with working liquid flowing through drain orifices from upper cylindrical body parts into lower one during plunger operation. The orifices are defined by at least one slot and at least one annular groove formed in plunger surface. Slots and grooves are located so that cavities defined by the slots and the grooves intersect each other.
EFFECT: increased reliability and service time, reduced costs for equalizer production and improved damping ability.
1 dwg
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| SUCKER-ROD PUMP UNIT | 1991 |
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RU2018034C1 |
