Geologic Characterization of a Bakken Reservoir for Potential CO<sub>2</sub> EOR

Kurtoglu, Basak; Sorensen, James A.; Braunberger, Jason R.; Smith, Steven A.; Kazemi, Hossein

doi:10.1190/urtec2013-186

Cited by 46 publications

(33 citation statements)

References 3 publications

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“…The water-oil and liquid-gas relative permeability curves are from the previous study22, which were obtained from history matching from a production well in the Middle Bakken formation. It is noted that the oil and gas properties, rock properties, and fracture properties are within the reasonable range of typical oil properties reported in the literature19232425. In real field production, the bottomhole pressure does not decrease rapidly, but gradually from a larger value to a smaller value within a certain period.…”

Section: Resultssupporting

confidence: 78%

“…The EDFM approach can be applied to effectively capture the complex fracture geometries and simulate their effects on oil and gas transport phenomenon in fractured porous media. Although the simulation production results were not compared with the actual field production data, which are difficult to obtain now, the simulations and prediction results are reasonable, for that the reservoir, fracture, and fluid properties used in the case studies are based on the experimental data in the Bakken tight oil reservoir22232425. In the future, great efforts will be made to further investigate the comparisons with the actual field production data.…”

Section: Resultsmentioning

confidence: 99%

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A Comprehensive Numerical Model for Simulating Fluid Transport in Nanopores

Zhang

Sepehrnoori

et al. 2017

Sci Rep

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Since a large amount of nanopores exist in tight oil reservoirs, fluid transport in nanopores is complex due to large capillary pressure. Recent studies only focus on the effect of nanopore confinement on single-well performance with simple planar fractures in tight oil reservoirs. Its impacts on multi-well performance with complex fracture geometries have not been reported. In this study, a numerical model was developed to investigate the effect of confined phase behavior on cumulative oil and gas production of four horizontal wells with different fracture geometries. Its pore sizes were divided into five regions based on nanopore size distribution. Then, fluid properties were evaluated under different levels of capillary pressure using Peng-Robinson equation of state. Afterwards, an efficient approach of Embedded Discrete Fracture Model (EDFM) was applied to explicitly model hydraulic and natural fractures in the reservoirs. Finally, three fracture geometries, i.e. non-planar hydraulic fractures, non-planar hydraulic fractures with one set natural fractures, and non-planar hydraulic fractures with two sets natural fractures, are evaluated. The multi-well performance with confined phase behavior is analyzed with permeabilities of 0.01 md and 0.1 md. This work improves the analysis of capillarity effect on multi-well performance with complex fracture geometries in tight oil reservoirs.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

A Comprehensive Numerical Model for Simulating Fluid Transport in Nanopores

Zhang

Sepehrnoori

et al. 2017

Sci Rep

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“…Most gases used for injection include carbon dioxide (CO 2 ), 88 nitrogen (N 2 ), natural gas or the mixture of them. Among these 89 gases, CO 2 has received much more attention for enhanced oil 90 recovery in the Bakken formation [7][8][9]. CO 2 has a considerably 91 lower minimum miscibility pressure (MMP) than that of the other 92 gases such as N 2 and CH 4 [10,11].…”

mentioning

confidence: 99%

CO2 injection for enhanced oil recovery in Bakken tight oil reservoirs

Lashgari

et al. 2015

Fuel

428

176

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“…Also, the oil-wet nature of some tight oil formations such as Bakken minimizes the effectiveness of water flooding. Both recent experimental and simulation studies have shown that carbon dioxide (CO 2 ) injection could be a feasible EOR method to improve the oil recovery and carbon storage and sequestration in tight oil reservoirs 4 5 6 7 8 9 . CO 2 has a considerably lower minimum miscibility pressure (MMP) than other gases such as N 2 and CH 4 10 11 .…”

mentioning

confidence: 99%

Simulation Study of CO2-EOR in Tight Oil Reservoirs with Complex Fracture Geometries

Zuloaga-Molero

et al. 2016

Sci Rep

137

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The recent development of tight oil reservoirs has led to an increase in oil production in the past several years due to the progress in horizontal drilling and hydraulic fracturing. However, the expected oil recovery factor from these reservoirs is still very low. CO2-based enhanced oil recovery is a suitable solution to improve the recovery. One challenge of the estimation of the recovery is to properly model complex hydraulic fracture geometries which are often assumed to be planar due to the limitation of local grid refinement approach. More flexible methods like the use of unstructured grids can significantly increase the computational demand. In this study, we introduce an efficient methodology of the embedded discrete fracture model to explicitly model complex fracture geometries. We build a compositional reservoir model to investigate the effects of complex fracture geometries on performance of CO2 Huff-n-Puff and CO2 continuous injection. The results confirm that the appropriate modelling of the fracture geometry plays a critical role in the estimation of the incremental oil recovery. This study also provides new insights into the understanding of the impacts of CO2 molecular diffusion, reservoir permeability, and natural fractures on the performance of CO2-EOR processes in tight oil reservoirs.

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Geologic Characterization of a Bakken Reservoir for Potential CO₂ EOR

Cited by 46 publications

References 3 publications

A Comprehensive Numerical Model for Simulating Fluid Transport in Nanopores

A Comprehensive Numerical Model for Simulating Fluid Transport in Nanopores

CO2 injection for enhanced oil recovery in Bakken tight oil reservoirs

Simulation Study of CO2-EOR in Tight Oil Reservoirs with Complex Fracture Geometries

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Geologic Characterization of a Bakken Reservoir for Potential CO2 EOR

Cited by 46 publications

References 3 publications

A Comprehensive Numerical Model for Simulating Fluid Transport in Nanopores

A Comprehensive Numerical Model for Simulating Fluid Transport in Nanopores

CO2 injection for enhanced oil recovery in Bakken tight oil reservoirs

Simulation Study of CO2-EOR in Tight Oil Reservoirs with Complex Fracture Geometries

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Geologic Characterization of a Bakken Reservoir for Potential CO₂ EOR