A method for the flow diagnosis and interpretation of a well test through the use of the pressure derivative function

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This paper presents an alternative technique for transient pressure analysis. The new method is based on the pressure derivative function and the impulse theory. This method uses a mathematical and graphical evaluation of an equation of the type [t{sub corr,f}] t{sup nf}{Delta}p'{sub 1} = m{sup 1}{sub f}, where n{sub f} is related to the specific flow pattern toward the well and the constant m{sup 1}{sub f} with the formation conductivity. This procedure simultaneously allows the diagnosis of the flow pattern through the presence of a horizontal line of a graph of [t{sub corr,f}]t{sup nf}{Delta}p'{sub 1} versus t, and an estimation ... continued below

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57-64

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Cendejas, Fernando Ascencio; Verduzco, Fernando Samaniego & Rodriquez, Jesus Rivera January 20, 1994.

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Description

This paper presents an alternative technique for transient pressure analysis. The new method is based on the pressure derivative function and the impulse theory. This method uses a mathematical and graphical evaluation of an equation of the type [t{sub corr,f}] t{sup nf}{Delta}p'{sub 1} = m{sup 1}{sub f}, where n{sub f} is related to the specific flow pattern toward the well and the constant m{sup 1}{sub f} with the formation conductivity. This procedure simultaneously allows the diagnosis of the flow pattern through the presence of a horizontal line of a graph of [t{sub corr,f}]t{sup nf}{Delta}p'{sub 1} versus t, and an estimation of the formation conductivity through the value of the constant m{sup 1}{sub f}, given by the intersection of this line with the ordinate axis. In the ordinate graphing group, t{sub corr,f} is a correction factor for variable rate producing conditions, approximately equal to unity for long producing times. For constant rate drawdown tests this factor is equal to one. f in this graphing group stands for the type of flow prevailing during a specific period of the test, i.e., spherical, linear, or radial. Variable well flow rates are also considered in the theory of analysis presented in this study. This new method is successfully applied to three field cases published in the literature.

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57-64

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  • Proceedings, nineteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 18-20, 1994

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  • Report No.: SGP-TR-147-9
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 889122
  • Archival Resource Key: ark:/67531/metadc876642

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 20, 1994

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 8:03 p.m.

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Cendejas, Fernando Ascencio; Verduzco, Fernando Samaniego & Rodriquez, Jesus Rivera. A method for the flow diagnosis and interpretation of a well test through the use of the pressure derivative function, article, January 20, 1994; United States. (digital.library.unt.edu/ark:/67531/metadc876642/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.