Reservoir Modeling in Shale-Gas Reservoirs
- Craig L. Cipolla (StrataGen Engineering) | Elyezer P. Lolon (StrataGen Engineering) | Jim C. Erdle (Computer Modelling Group Ltd.) | Barry Rubin (Computer Modelling Group Ltd.)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2010
- Document Type
- Journal Paper
- 638 - 653
- 2010. Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 2.5.2 Fracturing Materials (Fluids, Proppant), 5.8.2 Shale Gas, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.5 Reservoir Simulation, 5.1.5 Geologic Modeling, 3 Production and Well Operations
- Reservoir Modeling, Shale-Gas, Horizontal Wells, Hydraulic Fracturing, Unconventional Gas
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- 7,299 since 2007
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The exploitation of unconventional gas reservoirs has become an ever increasing component of the North American gas supply. The economic viability of many unconventional gas developments hinges on effective stimulation of extremely low-permeability rock by creating very complex fracture networks that connect huge reservoir surface area to the wellbore. In addition, gas desorption may be a significant component of overall gas recovery in many shale-gas reservoirs. The widespread application of microseismic (MS) mapping has significantly improved our understanding of hydraulic fracture growth in unconventional gas reservoirs (primarily shale) and has led to better stimulation designs. However, the overall effectiveness of stimulation treatments is difficult to determine from MS mapping because the location of proppant and the distribution of conductivity in the fracture network cannot be measured (and are critical parameters that control well performance). Therefore, it is important to develop reservoir-modeling approaches that properly characterize fluid flow in and the properties of a complex fracture network, tight matrix, and primary hydraulic fracture (if present) to evaluate well performance and understand critical parameters that affect gas recovery.
This paper illustrates the impact of gas desorption on production profile and ultimate gas recovery in shale reservoirs, showing that in some shale-gas reservoirs desorption may be a minor component of gas recovery. In addition, the paper details the impact of changing closure stress distribution in the fracture network on well productivity and gas recovery. In shale-gas reservoirs with lower Young's modulus rock, stress-dependent network-fracture conductivity may reduce ultimate gas recovery significantly. The paper includes an example that contrasts the application of numerical reservoir simulation and advanced decline-curve analyses to illustrate issues associated with conventional production-data-analysis techniques when applied to unconventional reservoirs.
Selected examples from the Barnett shale are included that incorporate MS fracture mapping and production data to illustrate the application of production modeling to evaluate well performance in unconventional gas reservoirs. This paper highlights production modeling and analysis techniques that aid in evaluating stimulation and completion strategies in unconventional gas reservoirs.
|File Size||2 MB||Number of Pages||16|
Arthur, J.D., Bohm, B., and Layne, M. 2008. Hydraulic FracturingConsiderations for Natural Gas Wells of the Marcellus Shale. Presented at TheGround Water Protection Council 2008 Annual Forum, Cincinnati, Ohio, USA, 21-24September.
Cipolla, C.L., Lolon, E.P., and Dzubin, B. 2009. Evaluating Stimulation Effectivenessin Unconventional Gas Reservoirs. Paper SPE 124843 presented at the SPEAnnual Technical Conference and Exhibition, New Orleans, 4-7 October. doi:10.2118/124843-MS.
Cipolla, C.L., Lolon, E.P., and Mayerhofer, M.J. 2008. Resolving Created, Propped, andEffective Hydraulic Fracture Length. Paper IPTC 12147 presented at theInternational Petroleum Technology Conference, Kuala Lumpur, 3-5 December. doi:10.2523/12147-MS.
Cipolla, C.L., Lolon, E.P., Mayerhofer, M.J., and Warpinski, N.R. 2009. Fracture Design Considerations inHorizontal Wells Drilled in Unconventional Gas Reservoirs. Paper SPE 119366presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands,Texas, USA, 19-21 January. doi: 10.2118/119366-MS.
Cipolla, C.L., Lolon, E.P., Mayerhofer, M.J., and Warpinski, N.R. 2009. The Effect of Proppant Distributionand Un-Propped Fracture Conductivity on Well Performance in Unconventional GasReservoirs. Paper SPE 119368 presented at the SPE Hydraulic FracturingTechnology Conference, The Woodlands, Texas, USA, 19-21 January. doi:10.2118/119368-MS.
Cipolla, C.L., Warpinski, N.R., Mayerhofer, M.J., Lolon, E.P., and Vincent,M.C. 2008. The Relationshipbetween Fracture Complexity, Reservoir Properties, and Fracture TreatmentDesign. Paper SPE 115769 presented at the SPE Annual Technical Conferenceand Exhibition, Denver, 21-24 September. doi: 10.2118/115769-MS.
Faraj, B. and Duggan, J. 2008. Marcellus Shale Gas Potential in the SouthernTier of New York. Presented at the Annual Canadian Society for UnconventionalGas (CSUG) Conference, Calgary, 19-21 November.
Fisher, M.K., Heinze, J.R., Harris, C.D., Davidson, B.M., Wright, C.A., andDunn, K.P. 2004. OptimizingHorizontal Completion Techniques in the Barnett Shale Using MicroseismicFracture Mapping. Paper SPE 90051 presented at the SPE Annual TechnicalConference and Exhibition, Houston, 26-29 September. doi: 10.2118/90051-MS.
Fisher, M.K., Wright, C.A., Davidson, B.M., Goodwin, A.K., Fielder, E.O.,Buckler, W.S., and Steinberger, N.P. 2002. Integrating Fracture MappingTechnologies to Optimize Stimulations in the Barnett Shale. Paper SPE 77411presented at the SPE Annual Technical Conference and Exhibition, San Antonio,Texas, USA, 29 September-2 October. doi: 10.2118/77441-MS.
Frantz, J.H. Jr., Williamson, J.R., Sawyer, W.K., Johnston, D., Waters, G.,Moore, L.P., Macdonald, R.J., Pearcy, M., Ganpule, S.V., and March, K.S. 2005.Evaluating Barnett ShaleProduction Performance Using an Integrated Approach. Paper SPE 96917presented at the SPE Annual Technical Conference and Exhibition, Dallas, 9-12October. doi: 10.2118/96917-MS.
Fredd, C.N., McConnell, S.B., Boney, C.L., and England, K.W. 2001. Experimental Study of FractureConductivity for Water-Fracturing and Conventional Fracturing Applications.SPE J. 6 (3): 288-298. SPE-74138-PA. doi:10.2118/74138-PA.
Kazemi, H. 1969. PressureTransient Analysis of Naturally Fractured Reservoir with Uniform FractureDistribution. SPE J. 9 (4): 451-462; Trans.,AIME, 246. SPE-2156-A. doi: 10.2118/2156-A.
Mayerhofer, M.J., Lolon, E.P., Youngblood, J.E., and Heinze, J.R. 2006. Integration of Microseismic FractureMapping Results With Numerical Fracture Network Production Modeling in theBarnett Shale. Paper SPE 102103 presented at the SPE Annual TechnicalConference and Exhibition, San Antonio, Texas, USA, 24-27 September. doi:10.2118/102103-MS.
Mayerhofer, M.J., Lolon, E.P., Warpinski, N.R., Cipolla, C.L., Walser, D.,and Rightmire, C.M. 2010. What IsStimulated Reservoir Volume? SPE Prod & Oper 25(1): 89-98. SPE-119890-PA. doi: 10.2118/119890-PA.
Medeiros, F., Ozkan, E., and Kazemi, H. 2008. Productivity and Drainage Area ofFracture Horizontal Wells in Tight Gas Reservoirs. SPE Res Eval &Eng 11 (5): 902-911. SPE-108110-PA. doi:10.2118/108110-PA.
Montgomery, S.L. 2004. Barnett Shale: A New Gas Play in the Fort WorthBasin. IHS Energy Petroleum Frontiers 20 (1).
Warpinski, N.R., Mayerhofer, M.J., Vincent, M.C., Cipolla, C.L., and Lolon,E.P. 2008. StimulatingUnconventional Reservoirs: Maximizing Network Growth While Optimizing FractureConductivity. Paper SPE 114173 presented at the SPE UnconventionalReservoirs Conference, Keystone, Colorado, USA, 10-12 February. doi:10.2118/114173-MS.
Warren, J.E. and Root, P.J. 1963. The Behavior of Naturally FracturedReservoirs. SPE J. 3 (3): 245-255; Trans., AIME,228. SPE-426-PA. doi: 10.2118/426-PA.