Analytical Model for Unconventional Multifractured Composite Systems
- Katya Stalgorova (IHS) | Louis Mattar (IHS)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- July 2013
- Document Type
- Journal Paper
- 246 - 256
- 2013. Society of Petroleum Engineers
- 5.7 Reserves Evaluation, 5.6.9 Production Forecasting
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- 1,781 since 2007
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This paper presents an analytical model for unconventional reservoirs with horizontal wells with multiple fractures. The model is an extension of the "trilinear flow" solution, but it subdivides the reservoir into five regions instead of three. This enables it to be used for more-complex reservoirs. Accordingly, the model can simulate a fracture that is surrounded by a stimulated region of limited extent (fracture branching), whereas the remaining reservoir is nonstimulated. In addition to modeling flow within the fracture and flow within the stimulated region, the model takes into account flow from the surrounding nonstimulated region, both parallel to and perpendicular to the fracture. The model can be used to simulate the flow in tight reservoirs with multifractured horizontal wells. In many cases, the fractures do not have a simple biwing shape, but are branched. This effectively creates regions of higher permeability around each fracture, which obviously affect the production performance significantly. However, in many tight reservoirs, in spite of their low permeability, the surrounding nonstimulated region can also be a significant contributor to long-term production. The five-region model accounts for this contribution. Thus, it is particularly valuable when generating production forecasts for reserves evaluation. The model was validated by comparing its results with numerical simulation. We found that analytical and numerical results are in good agreement only when the geometry of the system falls within certain limitations. However, these limitations are met in most cases of interest. Therefore, the model is useful for practical engineering purposes.
|File Size||788 KB||Number of Pages||11|
Anderson, D.M. and Mattar, L. 2005. An Improved Pseudo-Time for GasReservoirs With Significant Transient Flow. Paper 2005-114 presented at theCanadian International Petroleum Conference, Calgary, Alberta, 7-9 June. http://dx.doi.org/10.2118/2005-114.
Brohi, I., Pooladi-Darvish, M., and Aguilera, R. 2011. Modeling FracturedHorizontal Wells as Dual Porosity Composite Reservoirs—Application to TightGas, Shale Gas and Tight Oil Cases. Paper SPE 144057 presented at the SPEWestern North American Region Meeting, Anchorage, Alaska, 7-11 May. http://dx.doi.org/10.2118/144057-MS.
Brown, M., Ozkan, E., Raghavan, R. et al. 2009. Practical Solutions forPressure Transient Responses of Fractured Horizontal Wells in UnconventionalReservoirs. Paper SPE 125043 presented at the SPE Annual Technical Conferenceand Exhibition, New Orleans, Louisiana, 4-7 October. http://dx.doi.org/10.2118/125043-MS.
Dake, L.P. 1978. Fundamentals of Reservoir Engineering. Amsterdam:Elsevier.
Daneshy, A.A. 2003. Off-Balance Growth: A New Concept in HydraulicFracturing. J. Pet Tech 55 (4): 78-85. http://dx.doi.org/10.2118/80992-MS.
Mukherjee, H. and Economides, M. 1991. A Parametric Comparison of Horizontaland Vertical Well Performance. SPE Form Eval 6 (2):209-216. http://dx.doi.org/10.2118/18303-PA.
Stalgorova, E. and Mattar, L. 2012. Practical Analytical Model to SimulateProduction of Horizontal Wells With Branch Fractures. Paper SPE 162515presented at the SPE Canadian Unconventional Resources Conference, Calgary,Alberta, 30 October-1 November. http://dx.doi.org/10.2118/162515-MS.
Stehfest, H. 1970. Numerical Inversion of Laplace Transforms.Communications of the ACM 13 (1): 47-49. http://dx.doi.org/10.1145/361953.361969.