FIELD: oil-and-gas industry.
SUBSTANCE: proposed unit comprises mouth power unit, downhole hydraulic drive with moving stepped plunger connected with said power unit via hydraulic channels to transmit sign-variable load via drive medium thereto. Downhole pump is connected with flow string. Besides, it comprises extra downhole pump connected with extra flow string. Said plunger represents a three-step design. Hydraulic drive chambers arranged between plunger steps and its case have hydraulic communication with top and bottom borehole displacement pumps. Plunger steps are arranged in separate adjacent chambers connected with drive hydraulic channels. Plunger mid section and extreme sections are sealed at outlet from every adjacent section.
EFFECT: higher reliability and efficiency of well operation.
4 cl, 6 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DOWNHOLE PUMP UNIT | 2013 |
|
RU2519154C1 |
| DOWNHOLE PUMP UNIT | 2013 |
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RU2440513C1 |
