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
- 3 in the last 30 days
- 642 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 5.00|
|SPE Non-Member Price:||USD 35.00|
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|
Agarwal, R.G. 1979. "Real Gas Pseudo-Time"—A New Function for PressureBuildup Analysis of MHF Gas Wells. Paper SPE 8279 presented at the SPE AnnualTechnical Conference and Exhibition, Las Vegas, Nevada, 23-26 September. http://dx.doi.org/10.2118/8279-MS.
Al-Hussainy, R., Ramey H.J. Jr. and Crawford, P.B. 1966. The Flow of RealGases Through Porous Media. J Pet. Tech. 18 (5): 624-636.http://dx.doi.org/10.2118/1243-A-PA.
Arévalo-Villagrán, J.A., Wattenbarger, R.A., Samaniego-Verduzco, F., et al.2001. Production Analysis of Long-Term Linear Flow in Tight Gas Reservoirs:Case Histories. Paper SPE 71516 presented at the SPE Annual TechnicalConference and Exhibition, New Orleans, Louisiana, 30 September-3 October. http://dx.doi.org/10.2118/71516-MS.
Ayala H., L.F. and Ye, P. 2012. Analysis of Unsteady Responses of NaturalGas Reservoirs via a Universal Natural Gas Type-Curve Formulation. Paper SPE159956 presented at the SPE Annual Technical Conference and Exhibition, SanAntonio, Texas, 8-10 October. http://dx.doi.org/10.2118/159956-MS.
Ayala H., L.F. and Ye, P. 2013. Unified Decline Type-Curve Analysis forNatural Gas Wells in Boundary-Dominated Flow. SPE J. 18(1): 97-113. http://dx.doi.org/10.2118/161095-PA.
Blasingame, T.A. and Lee, W.J. 1988. The Variable-Rate Reservoir LimitsTesting Of Gas Wells. Paper SPE 17708 presented at the SPE Gas TechnologySymposium, Dallas, Texas, 13-15 June. http://dx.doi.org/10.2118/17708-MS.
Blasingame, T.A., McCray, T.L. and Lee, W.J. 1991. Decline Curve Analysisfor Variable Pressure Drop/Variable Flowrate Systems. Paper SPE 21513 presentedat SPE Gas Technology Symposium, Houston, Texas, 22-24 January. http://dx.doi.org/10.2118/21513-MS.
Carter, R.D. 1985. Type Curves for Finite Radial and Linear Gas-FlowSystems: Constant Terminal-Pressure Case. SPE J. 25 (5):719-728. http://dx.doi.org/10.2118/12917-PA.
Ehlig-Economides, C.A. and Ramey, H.J. Jr. 1981. Transient Rate DeclineAnalysis for Wells Produced at Constant Pressure. SPE J. 21(1): 98-104. http://dx.doi.org/10.2118/8387-PA.
Fetkovich, M.J. 1980. Decline Curve Analysis Using Type Curves. J Pet.Tech. 32 (6): 1065-1077. http://dx.doi.org/10.2118/4629-PA.
Fetkovich, M.J., Vienot, M.E., Bradley, M.D., et al. 1987. Decline CurveAnalysis Using Type Curves: Case Histories. SPE Form Eval 2(4): 637-656. http://dx.doi.org/10.2118/13169-PA.
Fraim, M.L. and Wattenbarger, R.A. 1987. Gas Reservoir Decline-CurveAnalysis Using Type Curves With Real Gas Pseudopressure and Normalized Time.SPE Form Eval 2 (4): 671-682. http://dx.doi.org/10.2118/14238-PA.
Ibrahim, M. and Wattenbarger, R.A. 2003. Determination of OGIP for Wells inPseudosteady-State—Old Techniques, New Approaches. Paper SPE 84286 presented atthe SPE Annual Technical Conference and Exhibition, Denver, Colorado, 5-8October. http://dx.doi.org/10.2118/84286-MS.
Mattar, L. and McNeil, R. 1995. The "Flowing" Material Balance Procedure.Paper SPE 95-77 presented at the Annual Technical Meeting, Calgary, Alberta,Canada, 14-17 May. http://dx.doi.org/10.2118/95-77.
Mattar, L. and Anderson, D.M. 2003. A Systematic and Comprehensive Methodfor Advanced Analysis of Production Data. Paper SPE 84472 presented at the SPEAnnual Technical Conference and Exhibition, Denver, Colorado, 5-8 October. http://dx.doi.org/10.2118/84472-MS.
Palacio-Uran, J.C. 1993. Analysis and Forecasting Of Gas Well Performance: ARigorous Approach Using Decline Curve Analysis. MS thesis, Texas A&MUniversity, College Station, Texas.
Palacio, J.C. and Blasingame, T.A. 1993. Decline-Curve Analysis With TypeCurves—Analysis of Gas Well Production Data. Paper SPE 25909 presented at theSPE Rocky Mountain Regional/Low Permeability Reservoirs Symposium, Denver,Colorado, 12-14 April. http://dx.doi.org/10.2118/25909-MS.
Thompson, T.W. and Mattar, L. 2000. Gas Rate Forecasting DuringBoundary-Dominated Flow. Paper SPE 2000-046 presented at Canadian InternationalPetroleum Conference, Calgary, Alberta, Canada, 4-8 June. http://dx.doi.org/10.2118/2000-046.
Ye, P. and Ayala H., L.F. 2012. A Density Diffusivity Approach for theUnsteady State Analysis of Natural Gas Reservoirs. J. Nat Gas Sci. Eng. 7: 22-34. http://dx.doi.org/10.1016/j.jngse.2012.03.004.
Ye, P. and Ayala H., L.F. 2013. Straightline Analysis of Flow Rate vs.Cumulative-Production Data for the Explicit Determination of Gas Reserves.J. Cdn. Pet. Tech. 52 (4): 296-305. http://dx.doi.org/10.2118/165583-PA.