Effect of Well Configuration and Flow Rate on Geomechanical Stability of a Fault during Recovery of Fault-Banked Oil
- Renuhaa Asaithambi (University of Southern California) | Birendra Jha (University of Southern California)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 22-26 April, Garden Grove, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 0.2.2 Geomechanics, 0.2 Wellbore Design, 5.5 Reservoir Simulation, 5 Reservoir Desciption & Dynamics
- geomechanics, seismic, banked oil, fault, coupled
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- 79 since 2007
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Recovery of bypassed oil banked against non-conductive faults in heavily-faulted and stress-sensitive reservoirs such as the Wilmington and Kern River fields of California can raise concerns of fault destabilization. Here, we investigate the effects of well configuration and well flow rate on the changes in stress and mechanical stability of a fault during recovery of fault-banked oil. We use a computational framework of coupled flow, geomechanics and Coulomb failure to quantify the evolution of fault stresses for different configurations and flow rates of two wells located across the fault. In the case of two producers across the fault, we find that the fault stability is determined by the difference in flow rates of the two producers. A smaller difference in well rates result into a smaller difference in pressure across the fault, which leads to a smaller rate of destabilization. In case of an injector-producer pair placed across the fault, a smaller difference in the flow rates results into a larger destabilization of the fault. We conclude that the inevitability of producing or injecting close to a fault requires detailed geomechanical studies to evaluate the effects of existing and planned well locations and well rates on fault stability. Using our coupled simulation framework, we show that both well configuration and rates play important roles in determining the stability of a fault. Results from this study can be incorporated into geomechanical hazard analysis of fault-banked oil operations around California.
|File Size||1 MB||Number of Pages||11|
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