The Dual Completion of a Geothermal Well

Abstract

Multiple completion of a well to allow separate production form selected horizons within the well, while not uncommon in the petroleum industry, is rare in the geothermal industry. The dual completion of well NG9 is believed to be a first in a geothermal well. The high flow rates, elevated temperatures an completion philosophy associated with a geothermal well required the development of new techniques to successfully install a dual completion. As an exploratory technique it enabled separate measurement of the properties of fluids produced at two different zone within a reservoir without the need to drill separate wells to each zone. However the dual completion resulted in a significant reduction in total well output. The design and installation of the dual completion are described and possible future uses for the technique are discussed.