Investigating Stress Path Hysteresis in a CO₂ Injection Scenario using Coupled Geomechanical-Fluid Flow Modelling

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• 作者：Tom Lynch ; Quentin Fisher ; Doug Angus ; Piroska Lorinczi
• 关键词：Coupled modelling ; Geomechanics ; hysteresis ; stress path ; numerical modelling ; fracture pressure
• 刊名：Energy Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：37
• 期：Complete
• 页码：3833-3841
• 全文大小：905 K

文摘

A successful CO₂ storage project will require large volumes of CO₂ to be injected into storage at industrial rates in a reliable and secure manner, the operators of the project must also be able to demonstrate the accuracy of modelling predictions for storage to both the regulators and public. Leakage from storage will compromise both the capacity estimates of the storage capacity, and the perceived security of the project even if the leakage is transient. Fluid induced fractures caused by injection of CO₂ above the fracture pressure of the formation will control the volume of CO₂ a storage reservoir can hold, and will control the rate of CO₂ injection; therefore the estimation of the pressure at which a formation will fracture is a key consideration in the modelling of a storage project. Field evidence of fracture pressures from reservoirs in the North Sea show evidence that the fracture pressure upon reinjection into a field is often lower than predicted by conventional approaches. This study presents a coupled geomechanical -fluid flow model modeling injection into a depleted field, the model exhibits hysteretic stress path behavior demonstrating a case of potential overestimation of fracture pressure. This study is the initial stage in a full sensitivity analysis of the material model parameters controlling stress path hysteresis including model geometry effects.