The development of highly reliable downhole equipment is an essential element in enabling the widespread utilization of Enhanced Geothermal Systems (EGS). The equipment used in these systems is required to operate at high voltages and temperatures on the order of 200 to 250°C (and eventually to 300˚C). These conditions exceed the practical operating ranges of currently available thermoplastic wire insulations, and thus limit the operating lifetime of motors, cables, and other high-voltage components used in these systems. This paper describes recent work by CTD in which improved performance in inorganic composite insulations was achieved, and relates the results to the anticipated operating requirements for future EGS equipment.

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