Discussion of the New Models for Composite Reservoir Pressure Transient Analysis
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2016 by IJETT Journal|
|Year of Publication : 2016|
|Authors : Ashkan Jahanbani G., Tom A. Jelmert
|DOI : 10.14445/22315381/IJETT-V38P238|
Ashkan Jahanbani G., Tom A. Jelmert"Discussion of the New Models for Composite Reservoir Pressure Transient Analysis", International Journal of Engineering Trends and Technology (IJETT), V38(4),214-217 August 2016. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Enhanced oil recovery (EOR) projects such as steam injection into an oil reservoir are usually analysed using composite reservoir models consisting of two regions separated by a vertical front. This simplification may lead to errors in the estimates. To overcome this, analytical models have been recently proposed taking into account some of the effects such as gravity, heat loss and gradual change of properties that are overlooked in the conventional models. In this paper, description and comparison of the recent models is given showing the differences due to different ways of treating gravity effect and variation of properties in the intermediate region(s). For a better representation of the composite reservoirs, it is suggested to apply these new models with tilted fronts and smooth change of the properties in type curve matching for improved well test analysis. Multi-region multi-layer composite model is an extension of the conventional models that can be improved by adding more intermediate regions and thin skin at the front locations. This model can reasonably match the recently developed models and should be used instead of the simpler models in the case of application of the conventional well test analysis.
 A. Satman, M. Eggenschwiler, R. W-K. Tang, and H. J.
Ramey Jr., “An Analytical Study of Transient Flow in
Systems with Radial Discontinuities,” in the 55th Annual
Meeting of SPE of AIME, Dallas, Texas, 1980, paper SPE
 A. K. Ambastha and H. J. Ramey Jr., “Pressure Transient Analysis for a Three- Region Composite Reservoir,” in the Rocky Mountain Regional Meeting of SPE of AIME, Casper, Wyoming, 1992, paper SPE 24378.
 R. B. Bratvold and R. N. Horne, “Analysis of Pressure Falloff Tests following Cold Water Injection,” SPE Formation Evaluation Journal, vol. 5 (3), pp. 293-302, 1990.
 L. G. Acosta and A. K. Ambastha, “Thermal Well Test Analysis Using an Analytical Multi-Region Composite Reservoir Model,” in the Annual Technical Conference and Exhibition of SPE of AIME, New Orleans, Louisiana, September 25-28, 1994, paper SPE 28422.
 C. Chakrabarty, “Pressure Transient Analysis of Non- Newtonian Power Law Fluid Flow in Fractal Reservoirs,” PhD Thesis, University of Alberta, Edmonton, Alberta, April 1993.
 M. B. Issaka and A. K. Ambastha, “An Improved Threeregion Composite Reservoir Model for Thermal Recovery Well Test Analysis,” in the Annual Meeting of CIM, Calgary, Alberta, June 8-11, 1997, paper CIM 97-55.
 E. Gomes and A. K. Ambastha, “An Analytical Pressure- Transient Model for Multilayered, Composite Reservoirs with Pseudo-steady-State Formation Crossflow,” in SPE Western Regional Meeting, Anchorage, Alaska, 26-28 May, 1993, paper SPE 26049.
 A. Jahanbani G., and T. A. Jelmert, “A Multi-Layer Commingled Composite Reservoir Model for Thermal Well Test Analysis,” International Journal of Engineering Trends and Technology (IJETT), vol. 18 (6), pp. 283-292, 2014.
 A. Jahanbani G., and T. A. Jelmert, “A New Composite Reservoir Model for Thermal Well Test Analysis,” International Journal of Engineering Trends and Technology (IJETT), vol. 18 (8), pp. 357-366, 2014.
 A. Jahanbani G., and T. A. Jelmert, “A Multi-Layer Multi- Region Well Test Model,” International Journal of Engineering Trends and Technology (IJETT), vol. 19 (3), pp. 154-158, 2015.
 A. Jahanbani G. and J. Kleppe, “Analysis of Heat Loss Effects on Thermal Pressure Falloff Tests,” in the 14th European Conference on the Mathematics of Oil Recovery, Catania, Sicily, Italy, 8-11 September, 2014, paper EAGEMo P23.
well test analysis, composite reservoir, gravity override, heat loss, tilted front.