Field Case Studies of Pressure Buildup Behavior in Geysers Steam Wells

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The purpose of this paper is to illustrate and discuss practical application of pressure buildup test theory in The Geysers steam reservoir, where the theory has been used to make qualitative interpretations about such things as fracture geometry and boundary conditions. Quantitative estimates of reservoir permeability are made on a routine basis. Quantitative estimation of porosity using pressure buildup analysis requires a very accurate knowledge of reservoir geometry, so this application must be approached with caution, since the reservoir is still being delineated by exploratory drilling. The pressure buildup can conveniently be divided up into three general periods for purposes ... continued below

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143-149

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Strobel, Calvin J. December 1, 1976.

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The purpose of this paper is to illustrate and discuss practical application of pressure buildup test theory in The Geysers steam reservoir, where the theory has been used to make qualitative interpretations about such things as fracture geometry and boundary conditions. Quantitative estimates of reservoir permeability are made on a routine basis. Quantitative estimation of porosity using pressure buildup analysis requires a very accurate knowledge of reservoir geometry, so this application must be approached with caution, since the reservoir is still being delineated by exploratory drilling. The pressure buildup can conveniently be divided up into three general periods for purposes of discussion: (1) short-time, (2) radial flow, and (3) late-time. During short-time, pressure buildup is dominated by either wellbore storage and skin effect, linear flow along a fracture plane, or a combination of these. After these short-time effects die out, pressure becomes a linear function of the logarithm of time. This semi-log straight period will be called radial flow for purposes of discussion in this paper. At late-time, pressure departs from semi-log straight in various ways depending upon boundary conditions. Any or all of the above three periods typical of pressure buildup behavior at wells in The Geysers reservoir may be masked by such unpredictable things as condensation in the wellbore. Pressure buildup behavior recorded at wells in The Geysers dry steam field has been valuable in gaining insight into reservoir mechanics. Modern well test analysis methods have been applied successfully to describe field data and extract practical information. Buildup testing, however, is not an end in itself, but must be harmonized with other engineering and geological methods. Analysis of pressure buildup behavior along with geological information, is a logical first stage of analysis leading to more sophisticated methods such as reservoir simulation using digital computers. 8 refs., 9 figs.

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143-149

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  • Proceedings Second Workshop Geothermal Reservoir Engineering, Stanford University, Stanford, Calif., December 1-3, 1976

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  • Report No.: SGP-TR-20-20
  • Grant Number: E043-326-PA-50
  • Office of Scientific & Technical Information Report Number: 887334
  • Archival Resource Key: ark:/67531/metadc886256

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  • December 1, 1976

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 9, 2016, 8:02 p.m.

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Strobel, Calvin J. Field Case Studies of Pressure Buildup Behavior in Geysers Steam Wells, article, December 1, 1976; United States. (digital.library.unt.edu/ark:/67531/metadc886256/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.