Replacing annual shut-in well tests by analysis of regular injection data: Field-case feasibility study

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Regulations governing deep injection of industrial wastes for disposal require regular tests for monitoring the formation hydraulic properties changes in the vicinity of the wellbore. Such a monitoring is performed through transient pressure well testing, a procedure that is routinely used in the environmental and oil industries. In such tests, the pumping pressures and rates are recorded and analyzed to estimate the transmissivity and storativity of the rock in the vicinity of the wellbore. Numerous methods for analyzing such data have been developed since the pioneering paper by Theis (1935). The well test analysis methods are summarized in several monographs, ... continued below

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11 pages

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Silin, Dmitry; Tsang, Chin-Fu & Gerrish, Harlan May 21, 2003.

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Regulations governing deep injection of industrial wastes for disposal require regular tests for monitoring the formation hydraulic properties changes in the vicinity of the wellbore. Such a monitoring is performed through transient pressure well testing, a procedure that is routinely used in the environmental and oil industries. In such tests, the pumping pressures and rates are recorded and analyzed to estimate the transmissivity and storativity of the rock in the vicinity of the wellbore. Numerous methods for analyzing such data have been developed since the pioneering paper by Theis (1935). The well test analysis methods are summarized in several monographs, see, e.g., Earlougher (1977) and Matthews (1967). Traditional well test analysis methods are often based on estimating the slope of the pressure fall-off curve in a special time scale, e.g., using the Horner plot method (Horner, 1951). Such an approach is justified by asymptotic analysis of the pressure change relative to a uniform initial pressure distribution. However, in reality, such an initial condition may not hold true because the operations preceding the test make the pressure distribution not uniform. It has been demonstrated in Silin and Tsang (2002, 2003) that in the Horner plot method, this circumstance partially explains the deviation of the data points from the theoretically predicted straight line. A new method has been proposed to analyze well test data accounting for the pre-test operations. This method has been validated using synthetic and field well test data. In this paper, we demonstrate how the method can be applied to analyze regular pumping data from an injection field to estimate the formation's hydraulic properties without interrupting the operations. In this estimation, we use the code ODA developed at Berkeley Lab. This code implements the methods and algorithms developed by Silin and Tsang (2002, 2003).

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11 pages

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OSTI as DE00816545

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  • Second International Symposium on Underground Injection Science and Technology, Berkeley, CA (US), 10/22/2003--10/25/2003

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  • Report No.: LBNL--52941
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 816545
  • Archival Resource Key: ark:/67531/metadc739823

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  • May 21, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 2:18 p.m.

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Silin, Dmitry; Tsang, Chin-Fu & Gerrish, Harlan. Replacing annual shut-in well tests by analysis of regular injection data: Field-case feasibility study, article, May 21, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc739823/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.