FIELD: pump engineering.
SUBSTANCE: well pumping unit comprises pipe string provided with packer mounted on the string from top to bottom and provided with the central through passage and support. The support is provided with by-pass ports and axial stepped passage which can receive the locking insert with the central through passage or jet pump, the housing of which receives active nozzle, mixing chamber with diffuser, passage for supplying fluid to the active nozzle, passage for supplying fluid to be pumped out, and passage for discharging fluid mixture. The housing is provided with the through passage made above the passage for supplying the fluid to be pumped and connected with it. The through passage has the seat for installation of the sealing unit which is provided with axial passage. A flexible pipe passes through the axial passage and the passage for supplying fluid to be pumped for permitting axial movement. The bottom end of the flexible pipe is provided with logging instrument for measuring physical characteristics, e.g., electric resistance of rocks. The jet pump has the following sizes: ratio of the diameter of mixing chamber inlet Dmix to that of the nozzle inlet Dn ranges from 1.1 to 2.4, ratio of mixing chamber length Lmix to the diameter of the mixing chamber inlet Dmix ranges from 3 to 7, ratio of nozzle length Ln to its outlet diameter Dn ranges from 1 to 8, distance L from the nozzle outlet to the mixing chamber inlet ranges from 0.3 to 2 of the diameter of nozzle outlet Dn, and angle of inclination of the diffuser generatrix to its longitudinal axis ranges from 4o to 14o. The passage for discharging mixture is in communication with the by-pass ports and, through them, with the space around the pipe string. The passage for supplying fluid is in communication with the inner space of pipes above the jet pump.
EFFECT: enhanced reliability of plant.
8 cl, 3 dwg
