Straightline Analysis of Flow Rate vs. Cumulative-Production Data for the Explicit Determination of Gas Reserves
- Peng Ye (Pennsylvania State University) | Luis Ayala (Pennsylvania State University)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- July 2013
- Document Type
- Journal Paper
- 296 - 305
- 2013. Society of Petroleum Engineers
- 4.6 Natural Gas, 5.6.9 Production Forecasting, 5.7 Reserves Evaluation
- 4 in the last 30 days
- 781 since 2007
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Production forecasting and prediction of original fluids in place are important gas-well-performance evaluations which are routinely conducted using rate/time decline-curve analysis. Currently, rate/time decline-curve analysis of natural-gas reservoirs relies heavily on the use of empirical curve fitting of boundary-dominated rate/time production data using type curves or the Arps hyperbolic decline model. In this study, we show that original fluids-in-place prediction and gas-well-performance evaluations can be conducted simply by straightline analysis of boundary-dominated data in flow-rate vs. cumulative-production plots. We first analytically demonstrate that the hyperbolic decline exponent describing the depletion of single-phase volumetric gas reservoirs is not subject to empirical determination from rate/time data. Decline behaviour of gas wells producing at less than full potential is also shown to exhibit a hybrid decline character: hyperbolic during early boundary-dominated flow and exponential at later times. In both cases, explicit calculations of hyperbolic decline coefficients are possible, thus enabling the explicit calculation of gas reserves using flow-rate vs. cumulative-production straightline plots. Numerical and field case studies are presented to demonstrate the applicability and generality of the proposed reserves determination methodology.
|File Size||1 MB||Number of Pages||10|
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