Shortening of NMR 1/T1 and 1/T2 Relaxation Rate Distribution Intervals in D2O Containing Jaw Cysts or Abscesses: Separation of Cysts from Abscesses

Yilmaz, Utku Nezih; Yılmaz, Burak

doi:10.1007/s10812-020-01093-0

Cited by 4 publications

(1 citation statement)

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“…However, high field NMR provides huge proton peaks that result in radiation damping [18]). Radiation damping can be removed by using a small amount of sample and a high amount of deuterated solvent such CDCl3 or D2O [19].…”

Section: Introductionmentioning

confidence: 99%

Proton $T_1$ and $T_2$ Relaxivities for $CH_2$ and $CH_3$ Peaks in Crude Oil Measured by 400 MHz NMR

Arsel

Kal

Yılmaz

2021

Journal of Engineering Technology and Applied Sciences

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Petroleum fluid has been extensively studied at low magnetic fields by Nuclear Magnetic Resonance (NMR) Spectroscopy, but high field NMR studies are rarely found in this area. The aim of this study is to determine the proton spin-lattice relaxation rate (1/T 1 ), T 1 relaxivity (R 1 ), proton spin-spin relaxation rate (1/T 2 ) and T 2 relaxivity (R 2 ) of paraffinic CH 2 and gamma CH 3 peaks. For this purpose, crude oil samples were taken from 3 separate wells in the Batman region. Using these samples, 3 different sets were prepared from a mixture of deuterated chloroform (CDCl 3 ) and crude oil. The total volume of each prepared mixture was 1 mL. The crude oil content in each set was changed from 0.05 mL to 0.20 mL in 0.05 mL steps.. Special care has been taken to ensure the best shimming of the NMR spectrometer operating at 400 MHz. T 1 measurements were performed using an inversion recovery (IR) pulse sequence. 1/T 2 values were determined from the half-height line widths of CH 2 and CH 3 peaks. 1/T 1 and 1/T 2 rates and all relaxivities were found to vary from well to well. This change is due to the fluid composition of the wells. The 1/T 2 rates and R 2 relaxivities were found to be considerably greater than the 1/T 1 rates and R 1 relaxivities. R 2 relaxivities for CH 3 were also 2-5 times greater than for CH 2 .The higher 1/T 2 and R 2 relaxivities compared with 1/T 1 and R 1 were attributed to the additional CDCl 3mediated relaxation mechanisms. In conclusion, available data show that high 1/T 2 rates and R 2 relaxivities measured in the high field NMR laboratory can be applied to separate crude oil from other fluids in the oil field.

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Section: Introductionmentioning

confidence: 99%