Enhanced Oil Recovery in Fractured Reservoirs

Fernø, Martin A.

doi:10.5772/34732

Cited by 7 publications

(2 citation statements)

References 65 publications

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“…2 and 5 show that diffusion as an oil-recovery mechanism is effective at the laboratory scale with R F ¼ 86% original oil in place (OOIP) during first-contact-miscible CO 2 injection with small cylindrical core plugs. The recoverable oil by CO 2 is higher than that of waterflooding when the same rock type is used, in which oil recoveries between 30 and 60% OOIP are observed depending on wettability (Graue et al 2001(Graue et al , 2002. It also indicates that the diffusion could be important in a highly fractured reservoir.…”

Section: Discussion and Numerical Analysismentioning

confidence: 96%

Visualization of Carbon Dioxide Enhanced Oil Recovery by Diffusion in Fractured Chalk

et al. 2016

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This work demonstrates that diffusion may be a viable oil-recovery mechanism in fractured reservoirs during injection of carbon dioxide (CO 2 ) for enhanced oil recovery, depending on the CO 2 distribution within the fracture network and distance between fractures. High oil recovery was observed during miscible, supercritical CO 2 injection (R F ¼ 86% original oil in place) in the laboratory with a fractured chalk core plug with a large permeability contrast. Dynamic 3D fluid saturations from computed-tomography (CT) imaging made it possible to study the local oil displacement in the vicinity of the fracture, and to calculate an effective diffusion coefficient with analytical methods. The obtained diffusion coefficient varies between 0.83 and 1.2 Â10 À9 m 2 =s, depending on the method used for calculation. A numerical sensitivity analysis, with a validated numerical model that reproduced the experiments, showed that the rate of oil production during CO 2 injection declined exponentially with increasing diffusion lengths from the CO 2 -filled fracture and oil-filled matrix. In a numerical upscaling effort, with the experimentally achieved diffusion coefficient, oilrecovery rates and local flow were studied in an inverted five-spot pattern in a heavily fractured carbonate reservoir.

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Section: Discussion and Numerical Analysismentioning

confidence: 96%

Visualization of Carbon Dioxide Enhanced Oil Recovery by Diffusion in Fractured Chalk

et al. 2016

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“…Accurate predictions of natural fracture systems require an understanding of the controls on fracture orientations and distributions in an area (Fernø, 2012). We have developed a workflow to correlate structural features at different scales, based on borehole image-, core-and seismic data.…”

Section: Introductionmentioning

confidence: 99%

An integrated workflow for fracture characterization in chalk reservoirs, applied to the Kraka Field

Aabø

Dramsch

Würtzen

et al. 2020

Marine and Petroleum Geology

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Oil and gas production of tight chalk reservoirs frequently rely on the presence of natural fractures, which increases the effective permeability of the reservoirs. Fracture characterization is therefore imperative in optimizing production schemes and obtaining economically viable recovery factors. Subsurface fracture characterization is often deemed challenging as the available data is typically of varying age and quality, and represents different scales.We have developed an integrated workflow for fracture characterization in chalk to address these challenges. The workflow is based on data from borehole images, cores and seismic. These data are typically available for most chalk (and hydrocarbon) fields. The interpreted borehole image dataset contains over 17 000 manual dip picks, ensuring a statistically viable base. A total of 150m of core is available from 3 wells. The applied 3D seismic cube covers a 8 x 5km hydrocarbon chalk field in the Danish North Sea.

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Economical Feasibility of N2 Injection into a Mature Naturally Fractured Gas-Condensate Reservoir with Tight Matrix

Castellanos,

Herbas

2023

Springer Series in Geomechanics and Geoengineering

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Enhanced Oil Recovery in Fractured Reservoirs

Cited by 7 publications

References 65 publications

Visualization of Carbon Dioxide Enhanced Oil Recovery by Diffusion in Fractured Chalk

Visualization of Carbon Dioxide Enhanced Oil Recovery by Diffusion in Fractured Chalk

An integrated workflow for fracture characterization in chalk reservoirs, applied to the Kraka Field

Economical Feasibility of N2 Injection into a Mature Naturally Fractured Gas-Condensate Reservoir with Tight Matrix

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