ZEiTECS Shuttle Rigless ESP
Replacement System

Initial installation procedure

The ZEiTECS Shuttle system comprises a downhole docking station and a retrievable ESP string. It is initially installed during a rig-supported workover in three steps: 

  • The docking station is attached to the bottom of the production tubing and run to a shallow depth. Inside the station are three electrical wet connectors and landing shoulders that support the weight of the ESP and its reactive forces and prevent the motor from counter-rotating on startup. A throughbore provides mechanical reservoir access if required.
  • The retrievable ESP string is assembled. It includes a motor connector, which orients and connects the ESP to the docking station. Above is a standard ESP assembly consisting of a pump, protector, motor, and optional gauges for reservoir monitoring. A seal assembly on top isolates the pump intake and discharge; a bypass valve allows fluid to drain on system retrieval.
  • The ESP string is lowered through the tubing into the docking station. Once the motor connector establishes connection, the complete system is run to the pump setting depth.

Rigless ESP retrieval and replacement

The ESP string can be quickly unplugged from the docking station and retrieved in a few hours. A GS tool lowered on wireline, CT, or sucker rods is latched onto the ESP string, which is then retrieved through the tubing. After service or replacement, the ESP string is redeployed using the same method. 

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