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3D seismic-assisted CO2-EOR Flow Simulation for the Tensleep Formation at Teapot Dome, USA

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The Tensleep Formation at Teapot Dome, Wyoming is a naturally fractured reservoir that has been studied for CO2-EOR. A realization of fractures is generated using a discrete fracture network (DFN) approach. The model DFN has three fracture sets: a dominant, high intensity N76°W set and two lower-intensity sets that strike N28°W and N75°E. The fracture intensity in the model DFN is extracted from a most negative curvature dissimilarity attribute calculated from the post-stack 3D seismic data. In addition, probable deformation bands are interpreted from the fracture intensity seismic attribute and incorporated in the reservoir model as permeability barriers parallel to N40°E striking S1 fault. The generated model DFN is plugged into a dual porosity compositional reservoir simulator (Eclipse 300) and adjusted to obtain a production history match. A three parameter Peng-Robinson equation of state (EOS) is calibrated against the CO2 swelling tests laboratory data to obtain accurate phase behavior for CO2-EOR in the Tensleep reservoir. Two CO2-EOR models are evaluated. CO2 is injected in the B1 Tensleep Sandstone from the end of the production history (December, 2005) for 3 years at an injection rate of 1 MMSCF/day. The first model includes three horizontal injectors parallel to the main fracture set and the second model has three horizontal injection wells perpendicular to the dominant fracture set. Although immediate CO2 breakthrough is observed in both models, model 1 yields a higher oil recovery and a lower CO2 mole fraction at the surface. The oil recovery improvement is less than 700 MSTB for both models. Finally, we show that ultimate CO2-EOR recovered oil can vary up to 150 MSTB and depends on how impermeable the permeability barriers are.
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Document Type: Research Article

Publication date: 01 May 2017

This article was made available online on 06 May 2017 as a Fast Track article with title: "3D seismic-assisted CO2-EOR Flow Simulation for the Tensleep Formation at Teapot Dome, USA".

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