Performance parameters of ZQLB series of new direct-drive submersible screw pump

Technical parameters of ZQLB series of new direct-drive submersible screw pump electric control cabinet

Technical characteristics
     1. No sucker rod, which could eliminate the loss caused by rod and tubing wear.
     2. The control system adopts three closed loop control of position, speed and current, which allows the motor to adjust different well conditions.
     3. Low speed operation and large torque output; the motor speed is around 50-500rmp, and torque is large than 500Nm.
     4. Gas-locking is hardy occurred. Meanwhile it has demulsification effect.
     5. Continuous and stable swabbing.    
     6. It is suitable for vertical well, inclined well, horizontal well, especially suitable for well with problem of rod and tubing wear.
     7. It is suitable for extracting crude oil of high viscosity, high sand content and high oil-gas ratio.     
     8. Simple and reliable installation.
Application conditions
     1. Normal temperature model of rubber: medium temperature ≤ 90°C; special rubber: medium temperature can reach 150°C or even higher.
     2. Medium viscosity ≤ 5000mPa.s.
     3. Sand content or other solid particle content in volume is no more than 2.5%, and maximum particle diameter is no more than 1mm.
     4. The volume ratio of liquid and gas in the screw pump suction is no more than 10%.
     5. Oil well, which is installed the screw pump with normal temperature model of rubber, is not allowed to contain hydrogen sulfide, carbon dioxide, methane, aromatic gas and so on. Acid content (hydrochloric acid, sulfuric acid) is less than 5%.
     6. To the screw pimp with special rubber, the content of hydrogen sulfide, carbon dioxide, methane, aromatic gas is less than 2%. Acid content (hydrochloric acid, sulfuric acid) is less than 5%.
     7. To avoid screw pump evacuation and burning the stator, we must keep the screw pump a certain submergence degree of no less than 200m. 

Adavantages analysis of ZQLB series of new direct-drive submersible screw pump

      Large startup torque: It adopts the permanent magnet synchronous motor for submersible as the driving device, which can drive the screw pump down-hole to extract oil directly. Under the stepless speed regulation from ground control cabinet, the motor can start up smoothly and safely with low speed operation and large torque output.

      Good economic gains: eliminates the energy loss caused by sucker rods transmission and adopts the permanent magnet synchronous motor for submersible as the driving device, which has remarkable energy saving effect. The electricity consumption can be reduced by 30% compared with the ordinary equipment.

      Influence on power grid operation: It adopts the permanent magnet synchronous motor for submersible as the driving device. Its rotor has no inductive excitation current, and the power factor is more than 0.9.

      Servo operation and real-time monitoring: It applies high-performance sensor-less control cabinet to control the motor, which achieves three closed-loop controls of motor rotor speed, position and stator current.