Boone, Marijn

Bultreys, Tom

Cnudde, Veerle

De Schryver, Thomas

Masschaele, Bert

Van Hoorebeke, Luc

English

Bultreys, TomWE130000705862908020012886210000-0001-8217-805307ECB818-F0EE-11E1-A9DE-61C894A0A6B4

Boone, MarijnUGent0020043693018020006821678020006959119796580665930CA3322E-F0EE-11E1-A9DE-61C894A0A6B4

De Schryver, ThomasUGent002003124364802000426735973116025572FAEF464E-F0ED-11E1-A9DE-61C894A0A6B4

Masschaele, BertWE05801001192349840000823197F9A95752-F0ED-11E1-A9DE-61C894A0A6B4

Van Hoorebeke, LucTW06WE058010006029720000-0002-1943-1359F4301388-F0ED-11E1-A9DE-61C894A0A6B4

Cnudde, VeerleWE130019950359788010015827730000-0002-3269-5914F64E9522-F0ED-11E1-A9DE-61C894A0A6B4

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Investigating the influence of dynamic effects on two-phase flow at the pore scale with fast laboratory-based X-ray micro-CT

Ghent University Academic Bibliography

7th International Conference on Porous Media & Annual Meetingpage 1/2Investigating the influence of dynamic effects on two-phase flow at the porescale with fast laboratory-based X-ray micro-CTPresenter: Tom BultreysAUTHORSTom Bultreys (1), Marijn A. Boone (2), Thomas De Schryver (3), Bert Masschaele (4), Luc VanHoorebeke (5), Veerle Cnudde (6)1. PhD student, Ghent University, Krijgslaan 281 S8, 9000, Ghent, BE2. Ghent University3. Ghent University4. Ghent University/ X-Ray Engineering5. Ghent University6. Ghent UniversityABSTRACTRecent studies have provided insight in the dynamics of pore-scale events during two-phase flow inporous media [1,2]. Specifically, during drainage, discrete filling events (so-called Haines jumps) havebeen shown to possess complex transient dynamics, with high local flow velocities (up to 1m/s).Furthermore, a Haines jump turns out to be a non-local process, as such a jump can have a zone ofinfluence which extends over multiple pores. However, the importance of these transient dynamics tothe resulting properties on a larger, representative scale in real three-dimensional pore spaces is stillunclear. In this work, we investigate this by visualizing the evolution of the fluid distribution duringdrainage in a Bentheimer sandstone, without having to stop the flow between every two scans, andcomparing the experimental data to a static model description of the filling sequence.Over the last few years, it has become possible to monitor the pore-scale distribution of fluid phasesduring multi-phase flow over time by performing 4D X-ray micro-computed tomography (micro-CT)experiments [3,4]. The time resolution of these experiments is important, as short acquisition timesallow to study the fluid distribution before and after single (or few) filling events without interruptingthe flow. At synchrotron beam lines, (sub-)second time resolutions are attainable, but the scarcity ofsynchrotron beam time limits the amount of such experiments. Laboratory-based micro-CT systemsare much cheaper and therefore widely available, but most systems have a much lower time resolution,on the order of tens of minutes. Nonetheless, new developments in laboratory-based micro-CThardware and software are opening the door to time resolutions on the order of seconds.In this work, we present experiments in which two-phase (oil-water) flow in Bentheimer sandstone isvisualized using a laboratory-based micro-CT set-up at Ghent University’s Centre for X-rayTomography. The acquisition time for a complete 360 degree scan is 12 seconds, but continuousscanning allows us to further increase time resolutions. We are therefore able to capture the evolutionof the pore-scale distribution of oil during drainage, without interrupting the oil flow in between scans.We capture information on single pore-filling cascades, which we compare to a quasi-staticinvasion-percolation description of the filling sequence. Even though time resolutions are stillinsufficient to capture the transient dynamics, the experiments allow us to assess their influence on theresulting fluid configuration in the pore space. It is this configuration which largely determines themacroscopic petrophysical properties of the rock in question (e.g. relative permeability, capillarypressure curve, hysteresis properties, etc.).REFERENCES[1] Armstrong RT, Evseev N, Koroteev D, Berg S. Interfacial velocities and the resulting velocity7th International Conference on Porous Media & Annual Meetingpage 2/2field during a Haines jump. Int. Symp. Soc. Core Anal., Avignon, France: Society of Core Analysts;2014, p. 1–12.[2] Armstrong RT, Ott H, Georgiadis A, Rücker M, Schwing A, Berg S. Subsecond pore-scaledisplacement processes and relaxation dynamics in multiphase flow. Water Resour Res 2014:n/a – n/a.doi:10.1002/2014WR015858.[3] Berg S, Ott H, Klapp S a, Schwing A, Neiteler R, Brussee N, et al. Real-time 3D imaging ofHaines jumps in porous media flow. Proc Natl Acad Sci U S A 2013;110:3755–9.doi:10.1073/pnas.1221373110.[4] Youssef S, Deschamps H, Dautriat J, Rosenberg E, Oughanem R, Maire E, et al. 4D Imaging offluid flow dynamics in natural porous media with ultra-fast X-ray microtomography. Int. Symp. Soc.Core Anal., Napa Valley, USA: Society of Core Analysts; 2013.GRAPHICS

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Investigating the influence of dynamic effects on two-phase flow at the pore scale with fast laboratory-based X-ray micro-CT

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Ghent University Academic Bibliography