Effects of non-condensible gases on fluid recovery in fracturedgeothermal reservoirs

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Numerical simulations are performed in order to investigate the effects of noncondensible gases, (CO{sub 2}) on fluid recovery and matrix depletion in fractured geothermal reservoirs. The model used is that of a well producing at a constant bottomhole pressure from a two-phase fractured reservoir. The results obtained have revealed a complex fracture-matrix interaction due to the thermodynamics of H{sub 2}O-CO{sub 2} mixtures. Although the matrix initially contributes fluids (liquid and gas) to the fractures, later on, the flow directions reverse and the fractures backflow fluids into the matrix. The amount of backflow depends primarily upon the flowing gas saturation in ... continued below

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Bodvarsson, Gudmundur S. & Gaulke, Scott January 1, 1986.

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Numerical simulations are performed in order to investigate the effects of noncondensible gases, (CO{sub 2}) on fluid recovery and matrix depletion in fractured geothermal reservoirs. The model used is that of a well producing at a constant bottomhole pressure from a two-phase fractured reservoir. The results obtained have revealed a complex fracture-matrix interaction due to the thermodynamics of H{sub 2}O-CO{sub 2} mixtures. Although the matrix initially contributes fluids (liquid and gas) to the fractures, later on, the flow directions reverse and the fractures backflow fluids into the matrix. The amount of backflow depends primarily upon the flowing gas saturation in the fractures; the lower the flowing gas saturation in the fractures the more backflow. It is shown that the recoverable fluid reserves depend strongly on the amount of CO{sub 2} present in the reservoir system.

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  • Society of Petroleum Engineers 56th AnnualCalifornia Regional Meeting, Oakland, CA,04/2-4/1986

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  • Report No.: LBL--21112
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 909495
  • Archival Resource Key: ark:/67531/metadc880540

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  • January 1, 1986

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 15, 2016, 1:25 p.m.

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Bodvarsson, Gudmundur S. & Gaulke, Scott. Effects of non-condensible gases on fluid recovery in fracturedgeothermal reservoirs, article, January 1, 1986; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc880540/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.