Pore-scale contact angle measurements at reservoir conditions using X-ray microtomography

Andrew, Matthew; Bijeljic, Branko; Blunt, Martin J.

doi:10.1016/j.advwatres.2014.02.014

Cited by 366 publications

(233 citation statements)

References 34 publications

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“…Figure 7 shows the average and standard deviation of all contact angles (RCA, ACA, and SCA) measured in this study. These results show that SCA, RCA, and ACA have high discrepancies at each pore throat size, consistent with previous studies [38,40,47]. Contact angles measured using micro-CT with rock cores and beads packs also have a wide range of values due to hysteresis of contact angle, exposure time, complex geometry, and physical and chemical heterogeneity of the surface [38,40,47].…”

Section: Comparing Different Types Of Contact Anglesupporting

confidence: 79%

“…Thus, static contact angles have been measured with rocks, sand packs, and glass bids, showing a wide range of contact angles at pore level. The wide range of static contact angles are due to the following: (1) pore topology, hysteresis, surface chemical and physical heterogeneity, and injection patterns (i.e., drainage and imbibition) [9,30,33,[38][39][40]; (2) relaxation of contact angle [30]; and (3) low resolution of images. Thus, Scanziani et al [9] have proposed an "effective contact angle" measurement using fluid-fluid interface curvature instead of "true contact angle" at the contact line of fluids and rock surface.…”

Section: Introductionmentioning

confidence: 99%

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Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Jafari

Jung

2017

Sustainability

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Abstract:The pore-level two-phase fluids flow mechanism needs to be understood for geological CO 2 sequestration as a solution to mitigate anthropogenic emission of carbon dioxide. Capillary pressure at the interface of water-CO 2 influences CO 2 injectability, capacity, and safety of the storage system. Wettability usually measured by contact angle is always a major uncertainty source among important parameters affecting capillary pressure. The contact angle is mostly determined on a flat surface as a representative of the rock surface. However, a simple and precise method for determining in situ contact angle at pore-scale is needed to simulate fluids flow in porous media. Recent progresses in X-ray tomography technique has provided a robust way to measure in situ contact angle of rocks. However, slow imaging and complicated image processing make it impossible to measure dynamic contact angle. In the present paper, a series of static and dynamic contact angles as well as contact angles on flat surface were measured inside a micromodel with random pattern of channels under high pressure condition. Our results showed a wide range of pore-scale contact angles, implying complexity of the pore-scale contact angle even in a highly smooth and chemically homogenous glass micromodel. Receding contact angle (RCA) showed more reproducibility compared to advancing contact angle (ACA) and static contact angle (SCA) for repeating tests and during both drainage and imbibition. With decreasing pore size, RCA was increased. The hysteresis of the dynamic contact angle (ACA-RCA) was higher at pressure of one megapascal in comparison with that at eight megapascals. The CO 2 bubble had higher mobility at higher depths due to lower hysteresis which is unfavorable. CO 2 bubbles resting on the flat surface of the micromodel channel showed a wide range of contact angles. They were much higher than reported contact angle values observed with sessile drop or captive bubble tests on a flat plate of glass in previous reports. This implies that more precaution is required when estimating capillary pressure and leakage risk.

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Section: Comparing Different Types Of Contact Anglesupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Jafari

Jung

2017

Sustainability

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“…Another option is to work with porous media that do not contain any organic matter. For example, Brusseau et al [10] and Culligan et al [12] show air-water interfaces in 3D computed 2 tomography (CT) images of repacked sand and glass beads, respectively, at a resolution of about 12 µm using synchrotron X-ray CT. More recently, Andrew et al [4] show detailed air-water interfaces and are able to successfully measure contact angle of CO 2 -brine interfaces onto the solid surface of limestone at a small resolution of 2 µm. Working with a real soil material, Carminati et al [11] adopt yet another approach, in that they focus on the water that occupies part of the volume in larger pores, located between aggregates.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional distribution of water and air in soil pores: Comparison of two-phase two-relaxation-times lattice-Boltzmann and morphological model outputs with synchrotron X-ray computed tomography data

Pot

Peth

Monga

et al. 2015

Advances in Water Resources

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“…X-ray micro-computed tomography (µ-CT) multiphase flow experiments are aimed at imaging the in situ fluid phase distributions in porous media (Wildenschild et al 2005;Silin et al 2010;Iglauer et al 2011;Setiavan et al 2012;Andrew et al 2014). Recently, fast synchrotron-based µ-CT has been used to image fluid distributions under dynamic conditions (Berg et al 2013b); the term "dynamic" means that fluid flow is maintained while imaging, with ms integration times thus enabling dynamic process studies on basis of a series of images.…”

Section: Introductionmentioning

confidence: 99%

Fast X-ray Micro-Tomography of Multiphase Flow in Berea Sandstone: A Sensitivity Study on Image Processing

et al. 2014

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Synchrotron-based fast micro-tomography is the method of choice to observe in situ multiphase flow and displacement dynamics on the pore scale. However, the image processing workflow is sensitive to a suite of manually selected parameters which can lead to ambiguous results. In this work, the relationship between porosity and permeability in response to systematically varied gray-scale threshold values was studied for different segmentation approaches on a dataset of Berea sandstone at a voxel length of 3 µm. For validation of the image processing workflow, porosity, permeability, and capillary pressure were compared to laboratory measurements on a larger-sized core plug of the same material. It was found that for global thresholding, minor variations in the visually permissive range lead to large variations in porosity and even larger variations in permeability. The latter is caused by changes in the pore-scale flow paths. Pore throats were found to be open for flow at large thresholds but closed for smaller thresholds. Watershed-based segmentation was found to be significantly more robust to manually chosen input parameters. Permeability and capillary pressure closely match experimental values; for capillary pressure measurements, the plateau of calculated capillary pressure curves was similar to experimental curves. Modeling on structures segmented with hysteresis thresholding was found to overpredict experimental capillary pressure values, while calculated permeability showed reasonable agreement to experimental data. This demonstrates that a good representation of permeability or capillary pressure alone is not a sufficient quality criterion for appropriate segmentation, but the data should be validated with both parameters. However, porosity is the least reliable quality criterion. In the segmented images, always a lower porosity was found compared to experimental values due to micro-porosity below the imaging resolution. As a result, it is recommended to base the validation of image processing workflows on permeability and capillary pressure and not on porosity. Decane-brine distributions from a multiphase flow experiment were modeled in a thus validated µ-CT pore space using a morphological approach which captures only capillary forces. A good overall correspondence was found when comparing (capillary-controlled) equilibrium fluid distributions before and after pore-scale displacement events.

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Pore-scale contact angle measurements at reservoir conditions using X-ray microtomography

Abstract: 21.11.14 KB. OK to add published version, OA pape

Cited by 366 publications

References 34 publications

Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Three-dimensional distribution of water and air in soil pores: Comparison of two-phase two-relaxation-times lattice-Boltzmann and morphological model outputs with synchrotron X-ray computed tomography data

Fast X-ray Micro-Tomography of Multiphase Flow in Berea Sandstone: A Sensitivity Study on Image Processing

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