Mapping oil saturation distribution in a limestone plug with low-field magnetic resonance

Mitchell, Jonathan; Staniland, J. R.; Chassagne, Romain; Mogensen, Kristian; Frank, Soren; Fordham, E.J.

doi:10.1016/j.petrol.2013.04.008

Cited by 39 publications

(14 citation statements)

References 44 publications

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“…103 Low field profiling has been used to monitor oil recovery in short core plugs where nonuniform liquid distributions are observed due to capillary end effects and viscous instabilities. 35,104 The spatial dimension allows the oil saturation to be determined directly in the middle of the core plug, thereby ignoring the influence of such end effects that would dominate conventional estimates of saturation from bulk effluent analysis. 105 Monitoring displacement in 3D provides additional information on the dynamics of these recovery processes 106 and enables direct comparison to simulations run on the same geometry.…”

Section: Imagingmentioning

confidence: 99%

Contributed Review: Nuclear magnetic resonance core analysis at 0.3 T

Mitchell

Fordham

2014

Review of Scientific Instruments

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Nuclear magnetic resonance (NMR) provides a powerful toolbox for petrophysical characterization of reservoir core plugs and fluids in the laboratory. Previously, there has been considerable focus on low field magnet technology for well log calibration. Now there is renewed interest in the study of reservoir samples using stronger magnets to complement these standard NMR measurements. Here, the capabilities of an imaging magnet with a field strength of 0.3 T (corresponding to 12.9 MHz for proton) are reviewed in the context of reservoir core analysis. Quantitative estimates of porosity (saturation) and pore size distributions are obtained under favorable conditions (e.g., in carbonates), with the added advantage of multidimensional imaging, detection of lower gyromagnetic ratio nuclei, and short probe recovery times that make the system suitable for shale studies. Intermediate field instruments provide quantitative porosity maps of rock plugs that cannot be obtained using high field medical scanners due to the field-dependent susceptibility contrast in the porous medium. Example data are presented that highlight the potential applications of an intermediate field imaging instrument as a complement to low field instruments in core analysis and for materials science studies in general.

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Section: Imagingmentioning

confidence: 99%

Contributed Review: Nuclear magnetic resonance core analysis at 0.3 T

Mitchell

Fordham

2014

Review of Scientific Instruments

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“…nuclear magnetic resonance logging, Allen et al, 2000) and lower resolution surface seismic or electrical resistivity surveys (Ramirez, Daily, Owen, Chesnut, & LaBrecque, 1992;Tsourlos, Ogilvy, Papazachos, & Meldrum, 2011). High-resolution analyses of rock core samples are carried out in laboratories by using magnetic resonance imaging (Mitchell, Chandrasekera, Holland, Gladden, & Fordham, 2013, Mitchell, Staniland, et al, 2013, X-ray tomography (Figure 23.2) or micro X-ray tomography (Kayser, Knackstedt, & Ziauddin, 2006;Ziauddin & Bize, 2007;Iglauer, Wang, & Rasouli, 2011;Feali et al, 2012). Induction measurements respond primarily to electrical conductivity (the reciprocal of resistivity); in the downhole environment, high conductivity values generally indicate the presence of salt water.…”

Section: Cross-well Electromagnetic Tomography In Hydrocarbon Reservomentioning

confidence: 99%

Applications of tomography in the oil-gas industry – Part 2

Xie¹,

Wilt

2015

Industrial Tomography

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“…[25,26]. Mitchell and co-workers exploited both rapid frequency-encoded [3] and SE-SPI [27] 1D -mapping for quantitatively monitoring oil-recovery during core floods. Diffusion MRI techniques based on filter-exchange pulse gradient spin-echo NMR combined with slice-selective pulses were recently developed by Topgaard and co-workers [9] to map the apparent exchange rates of water in cell membranes, where distinct compartments often have poor contrast in NMR relaxation times.…”

Section: Introductionmentioning

confidence: 99%

Spatially-resolved 1H NMR relaxation-exchange measurements in heterogeneous media

Terenzi

Sederman

Mantle

et al. 2019

Journal of Magnetic Resonance

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In the last decades, the 1 H NMR relaxation-exchange (REXSY) technique has become an essential tool for the molecular investigation of simple and complex fluids in heterogeneous porous solids and soft matter, where the mixing-time-evolution of crosscorrelated peaks enables a quantitative study of diffusive exchange kinetics in multicomponent systems. Here, we present a spatially-resolved implementation of the correlation technique, named , based on one-dimensional spatial mapping along using a rapid frequency-encode imaging scheme. Compared to other phase-encoding methods, the adopted MRI technique has two distinct advantages: (i) is has the same experimental duration of a standard (bulk) measurement, and (ii) it provides a high spatial resolution. The proposed method is first validated against bulk measurements on homogeneous phantom consisting of cyclohexane uniformly imbibed in finely-sized α-Al 2 O 3 particles at a spatial resolution of 0.47 mm; thereafter, its performance is demonstrated, on a layered bed of multi-sized α-Al 2 O 3 particles, for revealing spatiallydependent molecular exchange kinetics properties of intra-and inter-particle cyclohexane as a function of particle size. It is found that localised spectra provide well resolved cross peaks whilst such resolution is lost in standard bulk data. Future prospective applications of the method lie, in particular, in the local characterisation of mass transport phenomena in multi-component porous media, such as rock cores and heterogeneous catalysts.3

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Mapping oil saturation distribution in a limestone plug with low-field magnetic resonance

Cited by 39 publications

References 44 publications

Contributed Review: Nuclear magnetic resonance core analysis at 0.3 T

Contributed Review: Nuclear magnetic resonance core analysis at 0.3 T

Applications of tomography in the oil-gas industry – Part 2

Spatially-resolved 1H NMR relaxation-exchange measurements in heterogeneous media

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