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Dynamics of snap-off and pore-filling events during two-phase fluid flow in permeable media

DOI: 10.1038/s41598-017-05204-4 DOI Help

Authors: Kamaljit Singh (Imperial College London) , Hannah Menke (Imperial College London) , Matthew Andrew (Imperial College London) , Qingyang Lin (Imperial College London) , Christoph Rau (Diamond Light Source) , Martin J. Blunt (Imperial College London) , Branko Bijeljic (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 7

State: Published (Approved)
Published: July 2017
Diamond Proposal Number(s): 11587

Open Access Open Access

Abstract: Understanding the pore-scale dynamics of two-phase fluid flow in permeable media is important in many processes such as water infiltration in soils, oil recovery, and geo-sequestration of CO2. The two most important processes that compete during the displacement of a non-wetting fluid by a wetting fluid are pore-filling or piston-like displacement and snap-off; this latter process can lead to trapping of the non-wetting phase. We present a three-dimensional dynamic visualization study using fast synchrotron X-ray micro-tomography to provide new insights into these processes by conducting a time-resolved pore-by-pore analysis of the local curvature and capillary pressure. We show that the time-scales of interface movement and brine layer swelling leading to snap-off are several minutes, orders of magnitude slower than observed for Haines jumps in drainage. The local capillary pressure increases rapidly after snap-off as the trapped phase finds a position that is a new local energy minimum. However, the pressure change is less dramatic than that observed during drainage. We also show that the brine-oil interface jumps from pore-to-pore during imbibition at an approximately constant local capillary pressure, with an event size of the order of an average pore size, again much smaller than the large bursts seen during drainage.

Journal Keywords: Carbon capture and storage; Crude oil; Fluid dynamics; Imaging techniques; Surfaces, interfaces and thin films

Diamond Keywords: Carbon Capture and Storage (CCS)

Subject Areas: Earth Science, Environment

Instruments: I13-2-Diamond Manchester Imaging

Added On: 17/07/2017 16:17


Discipline Tags:

Earth Sciences & Environment Climate Change Geology Geophysics

Technical Tags:

Imaging Tomography