NMR Characterizations of Properties of Heterogeneous Media

Watson, A. T.; Phan, Jack; Uh, Jinsoo; Michalak, R.; Xue, Song

doi:10.2172/807241

Cited by 3 publications

(3 citation statements)

References 91 publications

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“…In this work, we extended the capabilities so that three-dimensional displacement experiments can be modeled. The details and validation of that implementation are provided elsewhere Watson et al 2002;Xue 2004). …”

Section: Methodsmentioning

confidence: 99%

“…44. A constant, continuous flow is delivered by dual-piston Quizix r QL-700 pumps, which are situated outside of the imaging enclosure (details on the configuration of the imager are provided in Watson et al (2002). Honeywell r differential pressure transducers are used to measure the pressure drop across the sample, and the pressure upstream of the sample, relative to atmospheric pressure, which is measured independently.…”

Section: Methodsmentioning

confidence: 99%

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NMR Characterizations of Properties of Heterogeneous Media

Chang¹,

Choi²,

Hollenshead³

et al. 2005

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A critical and long-standing need within the petroleum industry is the specification of suitable petrophysical properties for mathematical simulation of fluid flow in petroleum reservoirs (i.e., reservoir characterization). The development of accurate reservoir characterizations is extremely challenging. Property variations may be described on many scales, and the information available from measurements reflect different scales. In fact, experiments on laboratory core samples, well-log data, well-test data, and reservoir-production data all represent information potentially valuable to reservoir characterization, yet they all reflect information about spatial variations of properties at different scales.Nuclear magnetic resonance (NMR) spectroscopy and imaging (MRI) provide enormous potential for developing new descriptions and understandings of heterogeneous media. NMR has the rare capability to probe permeable media non-invasively, with spatial resolution, and it provides unique information about molecular motions and interactions that are sensitive to morphology. NMR well-logging provides the best opportunity ever to resolve permeability distributions within petroleum reservoirs.We develop MRI methods to determine, for the first time, spatially resolved distributions of porosity and permeability within permeable media samples that approach the intrinsic scale: the finest resolution of these macroscopic properties possible. To our knowledge, this is the first time that the permeability is actually resolved at a scale smaller than the sample.In order to do this, we have developed a robust method to determine of relaxation distributions from NMR experiments and a novel implementation and analysis of MRI experiments to determine the amount of fluid corresponding to imaging regions, which are in turn used to determine porosity and saturation distributions. We have developed a novel MRI experiment to determine velocity distributions within flowing experiments, and developed methodology using that data to determine spatially resolved permeability distributions.We investigate the use of intrinsic properties for developing improved correlations for predicting permeability from NMR well-logging data and for obtaining more accurate estimates of multiphase flow properties-the relative permeability and capillary pressure-from displacement experiments. We demonstrate the use of MRI measurements of saturation and relaxation for prediction wetting-phase relative permeability for unstable experiments. Finally, we developed an improved method for determining surface relaxivity with NMR experiments, which can provide better descriptions of permeable media microstructures and improved correlations for permeability predictions.ii

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

NMR Characterizations of Properties of Heterogeneous Media

Chang¹,

Choi²,

Hollenshead³

et al. 2005

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“…Two primary parameters are involved in interpreting the results: T 1 and T 2 , which represent the longitudinal and transverse relaxation time. , Sometimes T 1 alone is used to analyze pore size distribution, and sometimes a combination of T 1 and T 2 represents different fluids’ distribution in pores with contrasting sizes. , On the basis of the NMR technique, fluid self-diffusion could be evaluated because molecular diffusion will cause magnetization attenuation, , as the results also depend on pore geometry . Pore geometry parameters can also be associated with the apparent diffusivity and the magnetic field strength gradient under the pulsed gradient stimulated echo (PGSTE) pulse sequence.…”

Section: Nmr Application In Upstream Oil and Gasmentioning

confidence: 99%

Status and Outlook of Oil Field Chemistry-Assisted Analysis during the Energy Transition Period

et al. 2022

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Analytical chemistry is powerful in analyzing complex mixtures of crude oil and brine subsurfaces on the basis of atomic and molecular levels. Geochemistry applies chemical principles and experiments to understand earth science and engineering problems. Crude oil's molecule structure, especially for the resin and asphaltenes, could only be understood using advanced analytical chemistry techniques. Fingerprinting geochemistry applied for conventional and unconventional reservoirs helps better identify hydrocarbon resources. Subsequently, the reservoir fluid geodynamics (RFG) discipline is promoted because of the gap between the basin modeling and reservoir simulation models with geochemistry data. Fluid migration could be elaborated from the geological time when the reservoir trap was formed to nowadays with the span of millions of years. Also, asphaltene geochemistry data could be used to delineate reservoir compartmentalization. This work reviews the state-of-art theory and technology of analytical chemistry and geochemistry applied in the upstream oil and gas industry and proposes an improvement of high-resolution chemistry power for efficient and sustainable energy development.

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