CO₂ Sequestration And EOR Cooptimization In A Mature Field: Teapot Dome

CO₂ Enhanced Oil Recovery?CO₂-EOR?has been a mature technology for more than 40 years.This EOR process offers opportunities to mitigate CO₂ emissions through co-optimization of CO₂ sequestration and EOR.In this thesis,we focus on the Tensleep Sandstone to simulate CO₂-EOR and sequestration,and analyzed the effect of different injection scenarios.Research has been conducted to study mechanisms in CO₂-EOR and CO₂-sequestration,respectively.CO₂-EOR mechanisms in the simulation included CO₂ dissolution in crude oil to decrease viscosity and swelling crude oil.For CO₂ sequestration,CO₂ was allowed to get trapped in the pore space by hysteresis effects and dissolved in formation water through solubility.Based on a geostatistical model with detailed information on the reservoir geology,a dynamic model was built using the compositional simulator CMG-GEM.Simulation results for CO₂-EOR and sequestration in Tensleep B sandstone will serve future economic evaluations and reservoir development design.The sequence of injection influences oil recovery;the best timing for CO₂ injection to obtain a maximum oil recovery is the beginning of reservoir exploitation.When it comes to CO₂ sequestration,the best timing of CO₂ injection leading to the maximum storage volume is after continuous water injection.For water-alternating-gas scenarios,six month cycles are recommend,based on the high oil recovery observed and perceived lower operating cost.