Gas-Rate Forecasting in Boundary-Dominated Flow: Constant-Bottomhole-Pressure Decline Analysis by Use of Rescaled Exponential Models
- Miao Zhang (Pennsylvania State University) | Luis Ayala (Pennsylvania State University)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- June 2014
- Document Type
- Journal Paper
- 410 - 417
- 2013. Society of Petroleum Engineers
- 5.5 Reservoir Simulation
- 5 in the last 30 days
- 541 since 2007
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Gas-well performance forecasting during boundary-dominated flow (BDF) islargely based on the application of pseudopressure, pseudotime, andmaterial-balance-pseudotime concepts to rate, pressure, and time data.Recently, Ayala H. and Ye (2012; 2013) and Ye and Ayala H. (2013) demonstratedthe convenience and importance of a rescaled exponential model thatsuccessfully forecasted gas-well decline in BDF by use of density-baseddimensionless parameters in place of pseudovariables. In this study, theinterdependability and interchangeability of these methodologies is formallydemonstrated with a rigorous derivation for rescaled exponential models on thebasis of fundamental physical principles applicable to BDF conditions. Therescaled exponential equation is demonstrated to be a rigorous rate/timeequation modeling gas-rate decline in wells produced against aconstant-bottomhole-pressure specification. The proposed BDF decline equationis shown to be able to be expressed in terms of a dimensionless fluid parameter(¯B) that quantifies the µgcg dependency ondensity for the depletion process of interest, which has been directly tied tothe hyperbolic decline coefficient experienced by a declining gas well. Casestudies are presented to demonstrate the capabilities of the rescaledexponential model for gas-rate forecasting for wells producing at a constantbottomhole pressure, and its performance is compared to all other availablemodels in the literature.
|File Size||1 MB||Number of Pages||8|
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