Sampling Geopressured Fluids: Some Contributions from the Properties of the H{sub2}O-CH{sub4} System

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This paper is devoted t o predicting and quantitatively estimating geopressured fluid behavior during sampling of reservoirs in their natural, unperturbed conditions. Both the fluid in the sampler and the wellbore fluid are considered. To that end, I have developed a simple model ( an ''equation of state") t o estimate thermophysical properties of geopressured fluids. This model is briefly described. The "equation of state" is applied to compute and discuss fluid properties associated with the different stages of the sampling process. Questions explored include: the probable range of CH4 content of the samples; pressure, phase transitions, fraction of total ... continued below

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84-97

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Iglesias, Eduardo R. August 18, 1980.

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Description

This paper is devoted t o predicting and quantitatively estimating geopressured fluid behavior during sampling of reservoirs in their natural, unperturbed conditions. Both the fluid in the sampler and the wellbore fluid are considered. To that end, I have developed a simple model ( an ''equation of state") t o estimate thermophysical properties of geopressured fluids. This model is briefly described. The "equation of state" is applied to compute and discuss fluid properties associated with the different stages of the sampling process. Questions explored include: the probable range of CH4 content of the samples; pressure, phase transitions, fraction of total volume corresponding to each phase, and composition of each phase present in the sample, over the expected range of temperatures; whether and under what conditions the fluid collected at wellhead in a flowing w e l l provides a representative sample of the bottomhole fluid composition; the expected range of fluid pressures in the lubricator; and the expected range of differential stresses on the sampler. Bottomhole temperatures and pressures generally increase with depth in the geopressured formations of the Gulf Coast (e.g., Dorfman and Fisher, 1979). Thus, two well depths, representing approximatley the top and the bottom of the geopressured zone, were considered in detail to assess effects associated with depth. Finally, r e s u l t s and recommendations are summarized in Section I V .

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84-97

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  • Proceedings, Sixth Workshop Geothermal Reservoir Engineering, Stanford University, Stanford, California, December 16-18, 1980

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  • Report No.: SGP-TR-50-13
  • Grant Number: AT03-80SF11459
  • Office of Scientific & Technical Information Report Number: 889102
  • Archival Resource Key: ark:/67531/metadc884916

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  • August 18, 1980

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 6:29 p.m.

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Iglesias, Eduardo R. Sampling Geopressured Fluids: Some Contributions from the Properties of the H{sub2}O-CH{sub4} System, article, August 18, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc884916/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.