X-ray Microtomography of Intermittency in Multiphase Flow at Steady State Using a Differential Imaging Method

Dataset title X-ray Microtomography of Intermittency in Multiphase Flow at Steady State Using a Differential Imaging Method
Dataset creators Martin Blunt, Imperial College London
Ying Gao, Imperial College London
Qatar Carbonates and Carbon Storage Research Centre
Dataset theme Geoscientific Information
Dataset abstract

The images in this dataset are a sample of Bentheimer Sandstone from a micro-computed tomography (micro-CT) scan acquired with a voxel resolution of 6.00µm. We imaged the steady state flow of brine and decane in Bentheimer sandstone. We devised an experimental method based on differential imaging to examine how flow rate impacts the pore-scale distribution of fluids during coinjection. This allows us to elucidate flow regimes (connected, or breakup of the nonwetting phase pathways) for a range of fractional flows at two capillary numbers, Ca, namely 3.0E-7 and 7.5E-6. At the lower Ca, for a fixed fractional flow, the two phases appear to flow in connected unchanging subnetworks of the pore space, consistent with conventional theory. At the higher Ca, we observed that a significant fraction of the pore space contained sometimes oil and sometimes brine during the 1 h scan: this intermittent occupancy, which was interpreted as regions of the pore space that contained both fluid phases for some time, is necessary to explain the flow and dynamic connectivity of the oil phase; pathways of always oil-filled portions of the void space did not span the core. This phase was segmented from the differential image between the 30 wt % KI brine image and the scans taken at each fractional flow. Using the grey scale histogram distribution of the raw images, the oil proportion in the intermittent phase was calculated. The pressure drops at each fractional flow at low and high flow rates were measured by high precision differential pressure sensors. The relative permeabilities and fractional flow obtained by our experiment at the mm-scale compare well with data from the literature on cm-scale samples.

Dataset content dates 21/01/2017 – 08/02/2017
Dataset spatial coverage Not Applicable
Dataset supply format .TXM
Dataset language English-United Kingdom
Dataset discovery metadata record Discovery Link to the dataset's BGS Discovery Metadata record
Dataset publisher British Geological Survey
Dataset publication date 20th September 2018
Dataset digital object identifier(DOI) 10.5285/db27d484-55b9-4897-9f0a-3d7de343d2c6
Dataset citation text Imperial College London, Qatar Carbonates And Carbon Storage Research Centre (2018): X-ray Microtomography of Intermittency in Multiphase Flow at Steady State Using a Differential Imaging Method. British Geological Survey. (dataset). http://dx.doi.org/10.5285/db27d484-55b9-4897-9f0a-3d7de343d2c6
Constraints and terms of use This data set is delivered under the terms of the Open Government Licence, subject to the following acknowledgement accompanying any reproduced materials: "Imperial College London gratefully acknowledge permission to publish and funding from the Qatar Carbonates and Carbon Storage Research Centre (QCCSRC), provided jointly by Qatar Petroleum, Shell, and Qatar Science & Technology Park. Qatar Petroleum remain copyright owner."
Access the dataset http://www.bgs.ac.uk/services/ngdc/accessions/index.html#item118450
Further information Gao et al (2017) X-ray micro-tomography of intermittency in multiphase flow at steady state using a differential imaging method. Water Resources Research. DOI:10.1002/2017WR021736