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FixStar Fixed Speed Drives

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The FixStar fixed-speed drive model 3900 is equipped with a UniConn universal site controller. External view of the FixStar model 3900 with the optional site communication box (SCB).

Benefits

Safety features provide protection for service personnel
A wide operating range means greater flexibility of input voltages
Extensive electrical system monitoring and fault protection capabilities protect equipment from damage
System simplifies data gathering, and remote monitoring and control of ESP

Fixed-speed drives

The FixStar family provides electrical submersible pump (ESP) operators with electrical system protection for downhole ESP systems in a fixed-speed application. It also provides an effective platform for analyzing well and pump performance in real time.

The modular FixStar drive is a proven protection system for an ESP operating in a fixed-speed application. It incorporates a combination of a fused main disconnect switch (or circuit breaker) with a vacuum (or air-break) contactor that connects ESP systems to the surface power supply. This provides maximum protection for the ESP system in case of major surface or downhole electrical system faults. Built-in lightning arresters protect the downhole pump system from spikes in the supply system caused by lightning strikes. A control potential transformer provides power for all instruments housed in the FixStar enclosure. All the above-mentioned components are mounted in a high-voltage compartment. To provide better protection for field operators, the UniConn controller is located in a low-voltage compartment that is isolated from the highvoltage compartment.

The UniConn controller in the FixStar drive provides extensive electrical system monitoring and protection against both surface and downhole electrical faults. The current transformer in the UniConn controller, together with its burden module, provides true rms and high-resolution three-phase current monitoring. The three instrument-potential transformers provide directly measured three-phase voltages and the optional A095 backspin shunt provides backspin and leg ground protection.

Additionally, the FixStar drive is a platform for gathering data, remote monitoring, and controlling ESP operations when the UniConn controller’s expandable functionality is used. All wellsite surface instruments required for

running Phoenix artificial lift monitoring systems
using the espWatcher remote surveillance and control system
monitoring and controlling remotely with SCADA and other applications can now be fully housed in the FixStar drive’s enclosure. This provides a compact and simple solution. The specially designed low-voltage compartment can house the SCB for the espWatcher service and the Phoenix gauge threephase choke. Also, the high-voltage compartment can house a modified three-phase choke used with Phoenix gauges.

Other optional instruments that can be installed with a FixStar drive include

Bristol chart recorder
pilot light set
24-V DC battery pack.

These optional instruments allow the UniConn controller to gather data during power outages. All the FixStar drive options can be preassembled in the factory or assembled in the field.

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© 2009 Schlumberger, all rights reserved.	Printed on Saturday, November 21, 2009 at 3:10:40 PM