Numerical Modeling Compaction and Dilation Induced Permeability Changes in a Laumontite-rich Tight Rock in Laboratory and Field Scales
Zubair AKHTER1#+, Biao LI2, Sohail AKHTAR2, Bin XU3
1Concordia University, Montreal, Quebec, Canada, 2Department of Building, Civil & Environmental Engineering, Concordia University, Montreal, Quebec, Canada, 3Origin Geomechanics Inc., Calgary, Alberta, Canada

Laumontite-rich tight rock reservoirs are usually deeply buried and typically have low oil productivity and quickly declining oil rates. Our previous experimental results indicate the compaction/dilation nature of laumontite-rich tight rock under different stress conditions. Designing a suitable hydraulic fracturing scheme to enhance oil production in such laumontite-rich rock formation is challenging. In this study, we applied finite element simulations to study the impact of rock compaction/dilation on overall rock permeability in the lab and field scales. A soft rock plasticity model was applied to characterize the combined compaction and dilation yielding behaviors. The evolution of rock permeability during loading was quantified using the plastic strain result from numerical simulations. Fully coupled flow-deformation finite element simulations were also conducted to study the impact of rock compaction/dilation on well productivity. The possibility of creating a field scale shear band around a hydraulic fracturing well was investigated.Laumontite-rich tight rock reservoirs are usually deeply buried and typically have low oil productivity and quickly declining oil rates. Our previous experimental results indicate the compaction/dilation nature of laumontite-rich tight rock under different stress conditions. Designing a suitable hydraulic fracturing scheme to enhance oil production in such laumontite-rich rock formation is challenging. In this study, we applied finite element simulations to study the impact of rock compaction/dilation on overall rock permeability in the lab and field scales. A soft rock plasticity model was applied to characterize the combined compaction and dilation yielding behaviors. The evolution of rock permeability during loading was quantified using the plastic strain result from numerical simulations. Fully coupled flow-deformation finite element simulations were also conducted to study the impact of rock compaction/dilation on well productivity. The possibility of creating a field scale shear band around a hydraulic fracturing well was investigated.