| 摘要 |
FIELD: recovery of oil and other well liquids. SUBSTANCE: pump is reliably protected against mechanical impurities which settle in lift string when pump is stopped. Pump is also provided with piston-type safety protective device which reliably protects the pump in case of change in well characteristics. Pump is placed in operation after attains its maximum; provision is made for avoidance of rotor rotation in opposite direction. EFFECT: enhanced efficiency of pump operation. |
