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
- 2 in the last 30 days
- 788 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|
Agarwal, R.G.1979. "Real Gas Pseudo-Time"—A New Function For Pressure Buildup Analysis Of MHF Gas Wells. Presented at SPE Annual Technical Conference and Exhibition, Las Vegas, Nevada, 23–26 September. SPE-8279-MS. http://dx.doi.org/10.2118/8279-MS.
Agarwal, R.G., Gardner, D.C., Kleinsteiber, S.W., et al. 1999. Analyzing Well Production Data Using Combined-Type-Curve and Decline-Curve Analysis Concepts. SPE Res Eval & Eng 2 (5): 478–486. SPE-57916-PA. http://dx.doi.org/10.2118/57916-PA.
Al-Hussainy, R. and Ramey, H.J. Jr. 1966. Application of the Real Gas Flow Theory to Well Testing and Deliverability Forecasting. J Pet Technol 18 (5): 637–642. SPE-1243-B-PA. http://dx.doi.org/10.2118/1243-B-PA.
Arps, J.J. 1945. Analysis of Decline Curves. Trans. AIME 160 (1): 228–247. SPE-945228-G. http://dx.doi.org/10.2118/945228-G.
Ayala H., L.F. and Ye, P. 2013a. Unified Decline Type-Curve Analysis for Natural Gas Wells in Boundary-Dominated Flow. SPE J. 18 (1): 97–113. SPE-161095-PA. http://dx.doi.org/10.2118/161095-PA.
Ayala H., L.F. and Ye, P. 2013b. Density-Based Decline Performance Analysis of Natural Gas Reservoirs Using a Universal Type Curve. J. Energ. Resour.-ASME 135 (4): 042701-10. http://dx.doi.org/10.1115/1.4023867.
Ayala H., L.F. and Zhang, M. 2013. Rescaled Exponential and Density-Based Decline Models: Extension to Variable-Rate/Pressure-Drawdown Conditions. J Can Pet Technol 52 (6): 433–440. SPE-168223-PA. http://dx.doi.org/10.2118/168223-PA.
Araya, A. and Ozkan, E. 2002. An Account of Decline-Type-Curve Analysis of Vertical, Fractured, and Horizontal Well Production Data. Presented at SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 29 September–2 October. SPE-77690-MS. http://dx.doi.org/10.2118/77690-MS.
Blasingame, T.A. and Lee, W.J. 1988. The Variable-Rate Reservoir Limits Testing of Gas Wells. Presented at the SPE Gas Technology Symposium, Dallas, Texas, 13–15 June. SPE-17708-MS. http://dx.doi.org/10.2118/17708-MS.
Carter, R.D. 1985. Type Curves for Finite Radial and Linear Gas-Flow Systems: Constant Terminal-Pressure Case. SPE J. 25 (5):719–728. SPE-12917-PA. http://dx.doi.org/10.2118/12917-PA.
Chu, W., Fleming, C.H., and Carroll, K.M. 2001. Determination of Original Gas in Place in Ballycotton, Offshore Ireland. SPE Res Eval & Eng 4 (1): 11–15. SPE-69735-PA. http://dx.doi.org/10.2118/69735-PA.
Fetkovich, M.J. 1980. Decline Curve Analysis Using Type Curves. J. Pet Technol 32 (6): 1065–1077. SPE-4629-PA. http://dx.doi.org/10.2118/4629-PA.
Fraim, M.L. and Wattenbarger, R.A. 1987. Gas Reservoir Decline-Curve Analysis Using Type Curves With Real Gas Pseudopressure and Normalized Time. SPE Form Eval. 2 (4): 671–682. SPE-14238-PA. http://dx.doi.org/10.2118/14238-PA.
Ibrahim, M., Wattenbarger, R., and Helmy, W. 2003. Determination of OGIP for Wells in Pseudosteady-State—Old Techniques, New Approaches. Presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, 5–8 October. SPE-84286-MS. http://dx.doi.org/10.2118/84286-MS.
Ismadi, D., Kabir, C.S., and Hasan, A.R. 2012. The Use of Combined Static- and Dynamic-Material-Balance Methods with Real-Time Surveillance Data in Volumetric Gas Reservoirs. SPE Res Eval & Eng 15 (3): 351–360. SPE-145798-PA. http://dx.doi.org/10.2118/145798-PA.
Lee, W.J. and Holditch, S.A. 1982. Application of Pseudotime to Buildup Test Analysis of Low-Permeability Gas Wells with Long-Duration Wellbore Storage Distortion. J Pet Technol 34 (12): 2877–2887. SPE-9888-PA. http://dx.doi.org/10.2118/9888-PA.
Mattar, L. and Anderson, D.M. 2003. A Systematic and Comprehensive Methodology for Advanced Analysis of Production Data. Presented at SPE Annual Technical Conference and Exhibition, Denver, Colorado, 5–8 October. SPE-84472-MS. http://dx.doi.org/10.2118/84472-MS.
Medeiros, F., Kurtoglu, B., Ozkan E., et al. 2010. Analysis of Production Data From Hydraulically Fractured Horizontal Wells in Shale Reservoirs. SPE Res Eval & Eng 13 (3): 559–568. SPE-110848-PA. http://dx.doi.org/10.2118/110848-PA.
Palacio, J.C. and Blasingame, T.A. 1993. Decline-Curve Analysis With Type Curves - Analysis of Gas Well Production Data. Presented at the Low Permeability Reservoirs Symposium, Denver, Colorado, 12–14 April. SPE-25909-MS. http://dx.doi.org/10.2118/25909-MS.
Ye, P. and Ayala H., L.F. 2013. Straightline Analysis of Flow Rate vs. Cumulative Production Data for Explicit Determination of Gas Reserves. J Can Pet Technol 52 (4): 296–305. SPE-165583-PA. http://dx.doi.org/10.2118/165583-PA.
Zhang, M. and Ayala H., L.F. 2014. Gas-Rate Forecasting in Boundary-Dominated Flow: Constant-Bottomhole-Pressure Decline Analysis by Use of Rescaled Exponential Models. SPE J. 19 (3): 410–417. SPE-168217-PA. http://dx.doi.org/10.2118/168217-PA.