Objective
In general, NAUTILUS project aim is:
- to develop a subsea multiphase boosting system suitable for marginal or satellite fields and deep offshore applications,
- to address operational aspects of the system thus establishing its viability and limitations,
- to demonstrate the operation and control of the system through shallow water tests to identify areas requiring further developments or modifications,
- to demonstrate the viability of the system in real sea conditions before future field applications.
In particular, the objective of the present contract is the demonstration of the electrical power transmission and power control reliability at variable speed, from long distances, of a 1,3 MW motor pump unit, as engineered and validated with the support of EC (projects nr. OG/00304/92/FR and OG/00164/93/FR/UK).
The compatibility between the electrical chain and the subsea motor demonstrated. The "O" protection was certified by LCIE for the surface transformers. The subsea transformer Factory Acceptance Test was successfully completed. After the electrical chain compatibility with the NAUTILUS motor was demonstrated during the rotor stall and motor heating test, the assembly testing program of the system in no distance configuration was postponed due to vibration problems encountered on the motor rotor.
THE CONCEPT OF THE ELECTRICAL SYSTEM
The use of a power supply produced on a remote offshore facility and transmitted to the subsea station location was chosen after reviewing existing technologies and considering economical constraints and the ease of maintenance of the system, with the overall objective being to minimise the amount of innovation required.
THE COMPONENTS
A review of the various possible types of pump drive and motor concept concluded that the recommended solution for a subsea application is to use a directly coupled induction motor. Such motor is powered and controlled via a cable by a frequency converter which allows operation flexibility due to speed adjustment to multiphase production flow variation.
As the efficiency of the system increases with voltage, the choice of transmission voltage directly affects the maximum distance possible:
- a step-up transformer allows a choice of converter output voltage and conductors cross section,
- with integration of a subsea step-down transformer, all parameters (conductors section, converter and motor voltage) could be optimised without limitation
- the control of the induction motor consists of keeping the magnetic flux constant for the motor to be permanently able to deliver its rated torque.
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Coordinator
92500 Rueil Malmaison
France
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