Fluid Chemistry of the Ngawha Reservoir

Abstract

Analyses of fluids discharged from ten deep wells at Ngawha showed that the wells sampled a fluid which was compositionally rather uniform in all but gas component concentrations. Small variations in water chemistry indicate that waters are diluted in the east of the field and that higher level fluids leak into wells during discharge. Solute meters re the temperature measured in the higher temperatures are indicated by gas ratios, and have been verified by measured temperatures in the deep well Calcite precipitation in flashing wells may be a problem during exploitation, expecially in wells with a lower gas content.