FIELD: lifting underground gaseous and liquid media. SUBSTANCE: plant is provided with packer, jet pump, thread lock fitted under jet pump and additional packer mounted between main packer and threaded lock. Additional packer includes cylindrical housing with axial passage, holder mounted in housing for rotation, nut-pusher mounted on housing, sealing member mounted on housing under nut-pusher and washer located on housing between sealing member and nut-pusher. Housing is provided with seat where dismountable check valve is fitted. EFFECT: enhanced operational reliability. 3 dwg
