Evolution and Evaluation of SRV in Shale Gas Reservoirs: An Application in the Horn River Shale of Canada
- E. Urban (University of Calgary) | A. Yousefzadeh (University of Calgary) | C. J. Virues (Nexen Energy ULC) | R. Aguilera (University of Calgary)
- Document ID
- Society of Petroleum Engineers
- SPE Latin America and Caribbean Petroleum Engineering Conference, 17-19 May, Buenos Aires, Argentina
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Petroleum Engineers
- 2 Well completion, 3 Production and Well Operations, 5 Reservoir Desciption & Dynamics, 5.6.3 Pressure Transient Analysis, 5.5 Reservoir Simulation, 2.4 Hydraulic Fracturing, 2.5.5 Re-fracturing, 1.6.6 Directional Drilling, 3 Production and Well Operations, 2.4.1 Fracture design and containment, 5.8.2 Shale Gas
- microseismicity, hydraulic fracturing, complex fracture network, unconventional, SRV
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- 273 since 2007
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A hybrid hydraulic fracture (HHF) model composed of (1) complex discrete fracture networks (DFN) and (2) planar fractures is proposed for modeling the stimulated reservoir volume (SRV). Modeling the SRV is complex and requires a synergetic approach between geophysics, petrophysics, and reservoir engineering. The objective of this paper is to characterize and evaluate the SRV considering the initial hydraulic fracturing efficiency, fracture network complexity, mechanics, and microseismicity distribution along 145 stimulated stages in a multilateral horizontal well on the Muskwa, Otter Park and Evie Formations in the Horn River Shale in Canada.
Hydraulic fracturing jobs in shale reservoirs are designed with a view to achieve economic production by exploiting fracture network complexity. The task involves significant challenges in modeling and forecasting, which complicates the examination of operations to enhance their performance, including refracturing or infill drilling.
In this study, an HHF is run in a numerical simulation model to evaluate the SRV performance in planar and complex fracture networks using microseismicity data collected during 75 stages of hydraulic fracturing in the Horn River shale. Post-fracturing production is appraised with Rate Transient Analysis (RTA) for determining effective permeability under flowing conditions, compare to the numerical simulation and the hydraulic fracturing design.
Fracturing stages with larger fracture patch sizes, associated with the microseismic events in a fixed stress drop, correspond to higher stimulated areas, fracture conductivity, and gas production. Several microseismic events are observed in the heel of the laterals that are aligned to the far field NE stresses, indicated a loss of efficiency along the wellbore lateral during hydraulic fracturing. The hydraulic propagation modeling revealed increment of the leak-off coefficient, related to the natural fractures and communication with other stages. The production performance is evaluated in the numerical model, to measure interference between stages.
The SRV, modeled with HHF networks, is able to match the post-fracturing production history. Fracture mechanics is important in order to understand the flowing performance of the reservoir.
The inclusion of propagating models and RTA allowed to characterize possible fracture geometries in the reservoir and to observe limitations inherent to large dispersion and uncertainty of the microseismicity cloud. Also, to observe areas where the stimulation may have propped natural fractures totally or partially, which will benefit the production of gas.
This study presents a better understanding and characterization of the SRV in shale gas reservoirs, especially in those cases where microseismicity dispersion is problematic and where the SRV is not easily delimited.
|File Size||5 MB||Number of Pages||30|
Anderson, D. M., Turco, F., Virues, C. J. J., & Chin, A. (2013, November 11). Application of Rate Transient Analysis Workflow in Unconventional Reservoirs: Horn River Shale Gas Case Study. Society of Petroleum Engineers. doi:10.2118/167042-MS
Bohnhoff, M., G. Dresen, W. L. Ellsworth, and H. Ito (2010), Passive Seismic Monitoring of Natural and Induced Earthquakes: Case Studies, Future Directions and Socio-Economic Relevance, in New Frontiers in Integrated Solid Earth Sciences, International Year of Planet Earth, edited by S. Cloetingh and J. Negendank, Pp. 261-285, Springer, Netherlands, doi:10.1007/978-90-481-2737-5_7.
Cipolla, C. L., Maxwell, S. C., & Mack, M. G. (2012, January 1). Engineering Guide to the Application of Microseismic Interpretations. Society of Petroleum Engineers. doi:10.2118/152165-MS
Cipolla, C. L., Warpinski, N. R., Mayerhofer, M. J., Lolon, E., & Vincent, M. C. (2008, January 1). The Relationship Between Fracture Complexity, Reservoir Properties, and Fracture Treatment Design. Society of Petroleum Engineers. doi:10.2118/115769-MS
Cipolla, C. L., Weng, X., Mack, M. G., Ganguly, U., Gu, H., Kresse, O., & Cohen, C. E. (2011, January 1). Integrating Microseismic Mapping and Complex Fracture Modeling to Characterize Hydraulic Fracture Complexity. Society of Petroleum Engineers. doi:10.2118/140185-MS
Cipolla, C., & Wallace, J. (2014, February 4). Stimulated Reservoir Volume: A Misapplied Concept? Society of Petroleum Engineers. doi:10.2118/168596-MS
Hanks, T. C., and H. Kanamori (1979). A moment magnitude scale, Journal of Geophysical Research, 84, 5, 2348 --- 2350, 9B0059, doi:10.1029/JB084iB05p02348.
Kam, P., Nadeem, M., Novlesky, A., Kumar, A., & Omatsone, E. N. (2015, December 1). Reservoir Characterization and History Matching of the Horn River Shale: An Integrated Geoscience and Reservoir-Simulation Approach. Society of Petroleum Engineers. doi:10.2118/171611-PA
Kanamori, H. 1977. The Energy Release in Great Earthquakes. J Geophys Res 82 (20): 2981-2987. http://dx.doi.org/10.1029/JB082i020p02981.
Maxwell, S. C., Waltman, C., Warpinski, N. R., Mayerhofer, M. J., & Boroumand, N. (2009, February 1). Imaging Seismic Deformation Induced by Hydraulic Fracture Complexity. Society of Petroleum Engineers. doi:10.2118/102801-PA
Mayerhofer, M. J., Lolon, E., Warpinski, N. R., Cipolla, C. L., Walser, D. W., & Rightmire, C. M. (2010, February 1). What Is Stimulated Reservoir Volume? Society of Petroleum Engineers. doi:10.2118/119890-PA
Nordgren, R. P. (1972, August 1). Propagation of a Vertical Hydraulic Fracture. Society of Petroleum Engineers. doi:10.2118/3009-PA
Taylor, R. S., Stobo, B., Niebergall, G., Aguilera, R., Walter, J., & Hards, E. (2014, September 30). Optimization of Duvernay Fracturing Treatment Design Using Fully Compositional Dual Permeability Numeric Reservoir Simulation. Society of Petroleum Engineers. doi:10.2118/171602-MS
Virues, C., & Ehiriudu, I. (2016, February 1). Improving Understanding of Complex Fracture Geometry of the Canadian Horn River Shale Gas Using Unconventional Fracture Propagation Model in Multi-Staged Horizontal Wells. Society of Petroleum Engineers. doi:10.2118/179133-MS
Virues, C., Budge, J., & Lunen, E. von. (2015, September 28). Microseismic-Derived Expected Ultimate Fracture Half-Height Above/Below Wellbore in Unconventional Stimulated Reservoir Volume in a Multi-Fractured Horizontal 10 Well Pad - Canadian Horn River Basin Case Study. Society of Petroleum Engineers. doi:10.2118/174954-MS
Walters, R.J., Zoback, M.D., Baker, J.W., and Beroza, G.C. (2015). Characterizing and responding to seismic risk associated with earthquakes potentially triggered by fluid disposal and hydraulic fracturing Seismol. Res. Lett. http://dx.doi.org/10.1785/0220150048.
Warpinski, N. R., Wolhart, S. L., & Wright, C. A. (2001, January 1). Analysis and Prediction of Microseismicity Induced by Hydraulic Fracturing. Society of Petroleum Engineers. doi:10.2118/71649-MS