Gas-Production-Data Analysis of Variable-Pressure-Drawdown/Variable-RateSystems: A Density-Based Approach
- Miao Zhang (Pennsylvania State University) | Luis Ayala (Pennsylvania State University)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- November 2014
- Document Type
- Journal Paper
- 520 - 529
- 2014.Society of Petroleum Engineers
- boundary dominated, density-based, gas reserves, variable BHP
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- 772 since 2007
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This study demonstrates that production-data analysis of variable bottomhole-flowing-pressure/variable-rate gas wells under boundary- dominated flow (BDF) is possible by use of a density-based approach. In this approach, governing equations are expressed in terms of density variables and dimensionless viscosity/compressibility ratios. Previously, the methodology was successfully used to derive rescaled exponential models for gas-rate-decline analysis of wells primarily producing at constant bottomhole pressure (Ayala and Ye 2013a, b; Ayala and Zhang 2013; Ye and Ayala 2013; Zhang and Ayala 2014). For the case of natural-gas systems experiencing BDF, gas-well-performance analysis has been made largely possible by invoking the concepts of pseudotime, normalized pseudotime, or material-balance pseudotime. The density-based methodology rigorously derived in this study, however, does not use any type of pseudotime calculations, even for variable-rate/variablepressure-drawdown cases. The methodology enables straightforward original-gas-in-place calculations and gas-well-performance forecasting by means of type curves or straight-line analysis. A number of field and numerical case studies are presented to showcase the capabilities of the proposed approach.
|File Size||991 KB||Number of Pages||10|
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