Improved Steamflood Analytical Model
- Suandy Chandra (Texas A&M University) | Daulat Debataraja Mamora (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- December 2007
- Document Type
- Journal Paper
- 638 - 643
- 2007. Society of Petroleum Engineers
- 5.1 Reservoir Characterisation, 5.4.6 Thermal Methods, 5.5.8 History Matching, 4.1.2 Separation and Treating, 5.2.1 Phase Behavior and PVT Measurements, 1.2.3 Rock properties
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The Jones (1981) steamflood model incorporates oil displacement by steam as described by Myhill and Stegemeier (1978), and a three-component capture factor based on empirical correlations. The main drawback of the model, however, is the unsatisfactory prediction of the oil production peak: It is usually significantly lower than the observed value. Our study focuses on improving this aspect of the Jones model.
In our study, we simulated the production performance of a five-spot-steamflood-pattern unit and compared the results against those based on the Jones model (1981). To obtain a satisfactory match between simulation and Jones-analytical-model results, at the start and height of the production peak, the following refinements to the Jones model were necessary. First, the dimensionless steam-zone size AcD was modified to account for the decrease in oil viscosity during steamflood and its dependence on the steam injection rate. Second, the dimensionless volume of displaced oil produced VoD was modified from its square-root format to an exponential form. The modified model gave very satisfactory results for production performance for up to 20 years of simulated steamflood, compared to the original Jones model. Engineers will find the modified model an improved and useful tool for the prediction of steamflood-production performance.
Steamflooding is a major enhanced-oil recovery (EOR) process applied to heavy oil reservoirs. A steamflood typically proceeds through four development phases: reservoir screening, pilot tests, fieldwide implementation, and reservoir management (Hong 1994). Steamflood-performance prediction is essential to provide information for the proper execution of each development phase. Three mathematical models (statistical, numerical, and analytical models) are often used to predict steamflood performance.
Statistical models are based on the historical data of steamflood performance from other reservoirs which have similar oil and rock properties. A statistical model, however, does not include all the flow parameters, and thus may be inaccurate for a particular reservoir. Numerical models usually require a large amount of data input with lengthy calculations using computers; and they are usually CPU-, manpower- and time-consuming and also expensive. They may be extremely comprehensive and better serve as tools for research or advanced reservoir analysis. Meanwhile, analytical models are more economical, but at the expense of accuracy and flexibility. They serve as tools for engineering screening of possible reservoir candidates for field testing (Hong 1994).
For many years, attempts have been made to provide analytical models for steamflood-production-performance prediction (Marx and Langenheim 1959; Boberg 1966; Mandl and Volek 1969; Neuman 1975; Myhill and Stegemeier 1978; Gomaa 1980; Jones 1981; van Lookeren 1977; Farouq Ali 1970; Miller and Leung 1985; Rhee et al. 1978; Aydelotte et al. 1982). None of these analytical models gives a comparison with simulation results. Miller and Leung (1985) presented comparison between their analytical model and simulation results for cumulative production vs time, but the comparison for production rate vs time is not available.
|File Size||1 MB||Number of Pages||6|
Aydelotte, S.R. and Pope, G.A. 1983. A Simplified Predictive Model forSteamdrive Performance. JPT 35 (5): 991-1002. SPE-10748-PA.DOI: 10.2118/10748-PA.
Aziz, K., Ramesh, A.B., and Woo. P.T. 1987. Fourth SPE Comparative SolutionProject: Comparison of Steam Injection Simulators. JPT 39(12): 1576-1584. SPE-13510-PA. DOI: 10.2118/13510-PA.
Boberg, T.C. 1966. Calculationof the Production Rate of a Thermally Stimulated Well. JPT 18(12): 1613-1623. SPE-1578-PA. DOI: 10.2118/1578-PA.
Effinger, A.W. and Wasson, J.A. 1969. Applying Marx and LangenheimCalculations to the Prediction of Oil Recovery by Steamflooding in VenangoSands. USBM Information Circular 8432, US Dept. of the Interior, Washington,DC.
Ejiogu, G.C. and Fiori, M. 1987. High-Pressure Saturated-SteamCorrelations. JPT 39 (12): 1585-1590. SPE-15405-PA. DOI:10.2118/15405-PA.
Farouq Ali, S.M. 1970. GraphicalDetermination of Oil Recovery in a Five-Spot Steamflood. Paper SPE 2900presented at the SPE Rocky Mountain Regional Meeting, Casper, Wyoming, 8-9June. DOI: 10/2118-2900-MS.
Gomaa, E.E. 1980. Correlationsfor Predicting Oil Recovery by Steamflood. JPT 32 (2):325-332. SPE-6169-PA. DOI: 10.2118/6169-PA.
Hong, K.C. 1994. Steamflood Reservoir Management. Tulsa: PennWellBooks.
Jones, J. 1981. Steam DriveModel for Hand-Held Programmable Calculators. JPT 33 (9):1583-1598. SPE-8882-PA. DOI: 10.2118/8882-PA.
Mandl, G. and Volek, C.W. 1967. Heat and Mass Transport in Steam-DriveProcesses. Paper SPE 1896 presented at the Fall Meeting of the Society ofPetroleum Engineers of AIME, New Orleans, 1-4 October. DOI:10.2118/1896-MS.
Marx, J.W and Langenheim, R.H. 1959. Reservoir Heating by Hot FluidInjection, Trans., AIME 216: 312-315.
Miller, M.A. and Leung, W.K. 1985. A Simple Gravity Override Model ofSteamdrive. Paper SPE 14241 presented at the SPE Annual TechnicalConference and Exhibition, Las Vegas, Nevada, 22-25 September. DOI:10.2118/14241-MS.
Myhill, N.A. and Stegemeier, G.L. 1978. Steam-Drive Correlation andPrediction. JPT 30 (2): 173-182. SPE-5572-PA. DOI:10.2118/5572-PA.
Neuman, C.H. 1974. AMathematical Model of the Steam Drive Process Applications. Paper SPE 4757presented at the SPE Improved Oil Recovery Symposium, Tulsa, 22-24 April. DOI:10.2118/4757-MS.
Pratts, M. 1986. Thermal Recovery Monograph, Vol. 7, Houston:SPE.
Rhee, Shie W. and Doscher, Todd M. 1980. A Method for Predicting Oil Recoveryby Steamflooding Including the Effects of Distillation and GravityOverride. SPEJ 20 (4): 249-266. SPE 7547. DOI:10.2118/7547-PA
van Lookeren, J. 1983. Calculation Methods for Linear andRadial Steam Flow in Oil Reservoirs. SPEJ 23 (3): 427-439.SPE-6788-PA. DOI: 10.2118/6788-PA.