FIELD: fluidics. SUBSTANCE: jet pump is located in housing mounted on support in string. Housing is provided with passage for delivery of medium being pumped out and passage for discharge of mixture of media from jet pump to casing string- borehole annulus of well. Outlet of media mixture discharge passage is connected with bypass ports; sealing unit located above jet pump is mounted in seat in housing above supply passage. Sealing unit is provided with flow-through passage for laying the cable for instruments and equipment located below jet pump for their motion through borehole. According to another version, sealing unit is located in supply passage above jet pump. EFFECT: extended field of application of jet plant. 3 cl, 2 dwg
