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• W2009425404 abstract "Abstract In a previous work it was demonstrated that pressure transient analysis techniques could be applied to steam injection wells, providing important information regarding the progress of a steamflood project. In an extension of that study, the authors have examined several other aspects and applications of pressure transient analysis in steamflood projects. Through the analysis of actual steam injection well pressure falloff data and numerical simulation results, the application of the real gas law and the effects of gravity segregation of steam have been addressed. Also, the feasibility of interference testing has been studied. Introduction After the initiation of a steam displacement project, several years may pass before relevant information regarding the project's progress is available, most likely in the form of a sufficiently long production history. While the temperature observation and/or core wells can provide necessary early-time information, they are expensive and are subject to uncertainty due to sweep heterogeneity. For this reason, there has been interest in applying pressure transient techniques to thermal oil recovery. These pressure tests have usually been in the form of injection well falloff tests, with the major objective being the determination of the swept volume surrounding the injector. The earliest published tests involved air injection wells in in-situ combustion projects. Eggenschwiler, et al. proposed a simplified pressure transient analysis method which suggested that in addition to the pressure transient analysis method which suggested that in addition to the permeability-thickness product and skin factor, the swept zone volume could permeability-thickness product and skin factor, the swept zone volume could be obtained. Such a technique seemed ideally suited for thermal oil recovery, since a high mobility contrast between the swept and unswept regions must be assumed. Based upon this study, Walsh, et al. proposed guidelines to evaluate pressure falloff tests in both steamflood and fireflood projects, and provided data from several tests to demonstrate the analysis technique. Messner and Williams evaluated several pressure falloff tests from steamflood projects located on the west side of California's San Joaquin Valley and concluded that this type of pressure transient testing can be a valuable tool for evaluating the early progress of a steamflood project, while minimizing shut-in time and expense. The present paper is an extension of the study presented at the California Regional Meeting in March 1982. Investigation of the steam injection well pressure behavior and analysis of numerical simulation data helped with the pressure behavior and analysis of numerical simulation data helped with the interpretation of the pressure falloff data. The following section provides a discussion of the theory applied to pressure transient testing provides a discussion of the theory applied to pressure transient testing in steam injection wells, and the results of data analysis. Discussion Theory The development of a pressure transient theory for thermal injection wells has been a relatively recent achievement. From an idealized composite system, an analytical pressure solution was formulated, using the LaPlace transformation with numerical inversion. The solution was concerned with the transient flow of a slightly compressible fluid during injection into a composite reservoir. The solution incorporated both wellbore storage and a skin effect. Results from the pressure falloff shows that after a short period of wellbore storage and damage domination, a semilog straight line period of wellbore storage and damage domination, a semilog straight line develops which corresponds to the swept zone conductivity. From the slope of this line, the permeability-thickness product of the swept zone, kh, and the skin factor, s, could be calculated using standard infinite-acting reservoir equations. The key finding of the Eggenschwiler, et al. study concerned the pressure behavior after the end of the infinite-acting transient period. They demonstrated that a pseudosteady-state pressure response occurs after the end of the swept region semilog line, attributable to the high mobility contrast between the swept and unswept regions. In other words, the displacement front acted like a no-flow boundary for a short period of time. Consequently, calculation of the swept volume simply involved the techniques of reservoir limit testing. A Cartesian plot of pressure vs. time should reveal a straight line during this period of pseudosteady- state." @default.
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• W2009425404 date "1982-09-26" @default.
• W2009425404 modified "2023-09-26" @default.
• W2009425404 title "Further Investigator of Pressure Transient Testing in Steamflood Projects" @default.
• W2009425404 doi "https://doi.org/10.2118/11087-ms" @default.
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