FIELD: oil industry; recovery of oil from deep wells. SUBSTANCE: pumping unit consists of two hydraulically connected plunger pumps mounted in well at different heights. Upper pump is mounted inside tubing string and is placed in operation under action of sucker rod strings. Lower pump is mounted in near-bottom zone of well; this pump is provided with devices for mounting it on well bottom; this device is made in form of perforated pipe with blanked-off lower end. Plunger of pump is connected with lower end of tubing string; owing to this, drive of this pump is effected due to elongation and reduction of tubing string during operation of pumping unit. EFFECT: considerable reduction of times of equipment (second tubing string and sucker rods); reduced power requirements. 2 cl, 1 dwg
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