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- W2023323214 abstract "Abstract We present laboratory NMR measurements of 445 crude oil samples, four mud filtrates and four base oil samples, and 47 refined oil samples. In addition to measurements at ambient conditions, a subset of the samples were measured at high temperatures and high pressures for the purpose of investigating the temperature, pressure, chemical structure, and oxygen-saturation dependences of the NMR T2 relaxation time. We found that the relaxation time, T2, correlates with specific gravity better than with viscosity, especially for heavy oils. Molecular oxygen dissolved in the oils affects the light oils significantly and if uncorrected, the oxygen-saturated T2 departs significantly from known T2 viscosity and temperature correlations. We propose an approximate method to correct the effect of dissolved oxygen based on experimental investigation of oxygen-free and oxygen-saturated samples. We further studied the pressure dependence of the crude oils, OBMF, and refined oils and found that even for dead oils, T2 depends on pressure and the dependence fits a quadratic expression. Finally, we investigated the chemical structure dependence of the refined oil samples; we found that the viscosity-T2 correlation is different for ring-structured hydrocarbons from linear-chain structured hydrocarbons. On the other hand, alkanes, alkenes, and esters share the same correlation." @default.
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- W2023323214 date "2004-09-26" @default.
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- W2023323214 title "Laboratory Investigation of NMR Crude Oils and Mud Filtrates Properties in Ambient and Reservoir Conditions" @default.
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- W2023323214 doi "https://doi.org/10.2118/90553-ms" @default.
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