An evaluation of James' empirical formulae for the determination of two-phase flow characteristics in geothermal wells

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One of the most economical and simple methods of determination of two-phase flow parameters in geothermal well testing is the so-called James' method [1, 2]. The method consists of the measurements of lip pressure (p), and the flow rate of water (w) by a conventional weir. The stagnation enthalpy (h{sub o}) is then determined from a plot showing h{sub o} versus w/p{sup 0.96} which is empirically determined by James [1,2]. The mass flow rate is then determined from the following empirical formula G = 11,400 p{sup 0.96}/h{sub o}{sup 1.102} where G is the total mass flow rate in lb{sub m},/sec-ft{sup ... continued below

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pages 207-212

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Cheng, P. & Karmarkar, M. January 1, 1978.

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One of the most economical and simple methods of determination of two-phase flow parameters in geothermal well testing is the so-called James' method [1, 2]. The method consists of the measurements of lip pressure (p), and the flow rate of water (w) by a conventional weir. The stagnation enthalpy (h{sub o}) is then determined from a plot showing h{sub o} versus w/p{sup 0.96} which is empirically determined by James [1,2]. The mass flow rate is then determined from the following empirical formula G = 11,400 p{sup 0.96}/h{sub o}{sup 1.102} where G is the total mass flow rate in lb{sub m},/sec-ft{sup 2}, p is the lip pressure in psia, and h{sub o} is the specific enthalpy in BTU/lb{sub m}. The above relation is empirically determined for discharge pressure up to 64 psia and pipe diameters up to 8 inches. For pipe diameters smaller than 0.2 inches, it has been suggested that the value of 11,400 be replaced by 12,800. In view of the widespread use of the James' method, it is important to assess its accuracy and range of applicability.

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pages 207-212

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  • Proceedings fourth workshop geothermal reservoir engineering, Stanford, CA, December13-15, 1978

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  • Report No.: SGP-TR-30
  • Report No.: CONF-781222-26
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 892254
  • Archival Resource Key: ark:/67531/metadc884089

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  • January 1, 1978

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 5, 2016, 3:18 p.m.

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Cheng, P. & Karmarkar, M. An evaluation of James' empirical formulae for the determination of two-phase flow characteristics in geothermal wells, article, January 1, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc884089/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.