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Flow testing of the Newberry 2 research drillhole, Newberry volcano, Oregon

January 1, 1994

A 20 hour flow test of the Newberry 2 research drillhole at Newberry Volcano produced about 33,000 kilograms of fluid. The flow rate declined from about 0.8 kilograms per sec to less than 0.3 kilograms per sec during the course of the test. The mass ratio of liquid water to vapor was about 3:2 at the separator and stayed fairly constant throughout the test. The vapor phase was about half steam and half CO2 by weight. The average enthalpy of the steam/water mixture at the separator was about 1 ,200 kilojoules per kilogram. Because of the low flow rate and the large temperature gradient into the surrounding rocks, heat loss from the wellbore was high; a simple conductive model gives overall losses of about 1,200 kilojoules per kilogram of H2O produced. The actual heat loss may have been even higher due to convective effects, and it is likely that the fluid entering the bottom of the wellbore was largely or entirely steam and CO2. (Author 's abstract)

Citation Information

Publication Year 1986
Title Flow testing of the Newberry 2 research drillhole, Newberry volcano, Oregon
DOI 10.3133/wri864133
Authors S. E. Ingebritsen, W.W. Carothers, R. H. Mariner, J.S. Gudmundsson, E.A. Sammel
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Water-Resources Investigations Report
Series Number 86-4133
Index ID wri864133
Record Source USGS Publications Warehouse