Preliminary study of discharge characteristics of slim holes compared to production wells in liquid-dominated geothermal reservoirs

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This paper presents a theoretical study of the discharge characteristics of slim holes compared to production wells. Assuming that (1) the boreholes feed from an all-liquid zone, and (2) the feedzone pressure and temperature are independent of borehole diameter, calculations have been carried out for a variety of borehole diameters. The wellhead pressure/flowrate relationships for the various borehole diameters do not collapse to a single curve, even when flow rates are adjusted to account for differences in cross-sectional area. The area-scaled discharge rate declines with a decrease in borehole diameter. Both frictional pressure gradient and heat loss effects are more ... continued below

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181-187

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Pritchett, J. W. January 28, 1993.

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This paper presents a theoretical study of the discharge characteristics of slim holes compared to production wells. Assuming that (1) the boreholes feed from an all-liquid zone, and (2) the feedzone pressure and temperature are independent of borehole diameter, calculations have been carried out for a variety of borehole diameters. The wellhead pressure/flowrate relationships for the various borehole diameters do not collapse to a single curve, even when flow rates are adjusted to account for differences in cross-sectional area. The area-scaled discharge rate declines with a decrease in borehole diameter. Both frictional pressure gradient and heat loss effects are more significant for the smaller-diameter slim holes than for the larger-diameter wells. The difference in heat loss effects is probably responsible, at least in some cases, for the difficulty encountered in inducing deep slim holes (depths >> 300 m) to discharge. Scaling up the discharge capacity of slim holes to those of production wells by the cross-section area ratio provides a conservative estimate of production-size hole discharge.

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181-187

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  • Proceedings, eighteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 26-28, 1993

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  • Report No.: SGP-TR-145-26
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888930
  • Archival Resource Key: ark:/67531/metadc885404

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  • January 28, 1993

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 6, 2016, 4:23 p.m.

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Pritchett, J. W. Preliminary study of discharge characteristics of slim holes compared to production wells in liquid-dominated geothermal reservoirs, article, January 28, 1993; United States. (digital.library.unt.edu/ark:/67531/metadc885404/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.