... equation of state concentration nanopore clay surface upstream oil & gas electrolyte concentration clay mineral reservoir simulation mol dm 3 diffusion coefficient rd annual logging symposium adsorption water molecule clay nanopore interaction interface Abstract...

.... Modeling & Simulation pulse sequence diffusion coefficient Artificial Intelligence shale geometry Symposium algorithm log analysis Upstream Oil & Gas coefficient magnetic gradient magnetization well logging bulk decay constant magnetic field decay constant rock sample University...

... to diffusion coupling between different pores. This case is more common in unconventional and carbonate rocks both because of smaller pore sizes and consequently shorter distances to be traveled by moving spins, in addition to significantly higher diffusion coefficients present in the case of gas reservoirs...

... visualize the progress of liquid-liquid diffusion through the pore space. The imaged concentration profiles were fitted to models to estimate the average in-plane diffusivity coefficient. This tomographic analysis was validated and complemented by automated high-resolution 2D back-scattered SEM (BSEM...

... + 2) In equation 2: k is a generalized permeability, D a generalized diffusion coefficient, is the mass density, SPWLA 56th Annual Logging Symposium, July 18-22, 2015 3 and v is the mass transport flux. The term Fwg accounts for the forces exerted on the each molecule by gravitation and the pore...

... evaluation of petrophysical properties and the characterization of natural fractures. Artificial Intelligence Engineering Reservoir Characterization Fluid Dynamics numerical simulation diffusion coefficient petrophysical property application flow in porous media Simulation coreflood...

... well logging experiment Symposium log analysis NMR measurement diffusion coefficient estimation relaxation time Artificial Intelligence porosity Hürlimann Rio de Janeiro spwla 54 magnetic resonance University machine learning Upstream Oil & Gas sandstone surface relaxivity...

... signal intensity has been correlated to saturation. Recent advances allow for downhole measurement of diffusion coefficients, and it is known that diffusion coefficients can be a robust indicator of the hydrocarbon molecular size in a mixture of alkanes (Freed 2005). This work applies the previous work...

..., is rarely exceeded (England et al. 1995). DIFFUSION COEFFICIENTS In the absence of convection, diffusion is the prevailing mechanism to reach fluid compositional equilibrium. Albert Einstein (1905) related the mean square displacement R 2 of a particle under Brownian motion to the product of its molecular...

... extend to higher chain lengths than can be conventionally achieved with gas chromatography. For samples with significant methane content, diffusion measurements are a useful probe for identifying the gas. Gas dissolved in the oil shows a characteristic diffusion coefficient that is significantly reduced...

... diffusion coefficients of brine, oil, and gas molecules typically have values that are well separated from one another. Thus, the diffusion attenuation of a suite of measured NMR signals contains sufficient information to allow differentiation of brine, oil, and gas. NMR fluid typing brings new insight...

... time and diffusion coefficient. Using either synthetic or experimental data of mixed oil-water samples, we have resolved oil and water peaks based on the contrast in their relaxation times and diffusion coefficients. RD2D NMR logging was also performed in real open-hole wells by MRIL as well as CMR...

... ABSTRACT The inclusion of diffusion information in addition to relaxation is making a significant contribution to the interpretation of NMR well logs. The results can be displayed as a 2-D map or distribution of diffusion coefficient versus relaxation time, called D.T2 maps. These maps have...

... analysis well logging Viscosity Index log analyst alkane viscosity GOR diffusion coefficient correlation coefficient Upstream Oil & Gas diffusivity NMR crude oil Symposium interaction molecule Vinegar ambient pressure relaxation time gas-oil ratio THE LIMITS OF FLUID PROPERTY...

... Upstream Oil & Gas valuable information application axis well logging information water peak core plug spwla 44 dimension log analysis field gradient diffusion coefficient relaxation time PPM nmr technique provide valuable information Symposium chemical shift SPWLA 44 th...

... wait-times and multiple echo spacings. Since the T1 relaxation time and diffusion coefficients of various fluids are different, the apparent Y2 distribution varies with fluid type in porous media. Hence it becomes possible to analyze fluid type and its properties from the apparent Y2 variations. We...

... Upstream Oil & Gas log analysis decay well logging correspond diffusion coefficient inversion NMR measurement amplitude sequence diffusion saturation CPMG sequence Symposium relaxation time University diffusion measurement pore size diffusion-editing sequence gradient...

... that is based on the diffusion of pore fluids over extended diffusion times. log analysis Brine Upstream Oil & Gas mexico sample diffusion time peak shift experiment diffusion coefficient Pore Fluid internal magnetic field gradient field gradient relaxation msec well logging magnetic...

... Method?, uses the ratio of smoothed measured echo trains for two passes (at widely differing echo spacing) in a fit to an analytical expression. This expression is a function of the formation apparent diffusion coefficient and the CMR field gradient distribution. The Echo Ratio method has been...

.... Diffusion coefficients were computed using a standard log interpretation procedure that is based on shifts in the distribution of transverse (T2) relaxation times measured as a function of inter-echo time. An average pore fluid diffusion coefficient for partially oil-saturated samples is defined and shown...