Key words: oil, nuclear magnetic resonance (NMR), viscosity, rheology, self-diffusion

This paper describes the features of translational characteristics of oil molecules by using nuclear magnetic resonance method with pulsed magnetic field gradient (gradient NMR). It is shown that the rheological properties of heavy oil samples (viscosity) do not completely correlate with the measurement of self-diffusion coefficient. It is caused by distribution of oil samples according to their molecular composition and molecular weight as well as their complex supramolecular organization. It is noted that the best agreement with the viscosity characteristics is achieved via the introduction of a new average coefficient, which is a weighted sum of the inverse of the partial self-diffusion coefficients.

**
**
* *
* *
* *
* *
*
*
* *
* *

This paper describes the features of translational characteristics of oil molecules by using nuclear magnetic resonance method with pulsed magnetic field gradient (gradient NMR). It is shown that the rheological properties of heavy oil samples (viscosity) do not completely correlate with the measurement of self-diffusion coefficient. It is caused by distribution of oil samples according to their molecular composition and molecular weight as well as their complex supramolecular organization. It is noted that the best agreement with the viscosity characteristics is achieved via the introduction of a new average coefficient, which is a weighted sum of the inverse of the partial self-diffusion coefficients.

References

1. Bartenev G.M., Zelenev Yu.V., *Kurs fiziki polimerov *(The course of polymer

physics) edited by Frenkel' S.Ya., Leningrad: Khimiya Publ., 1976, 288 p.

2. Kargin V.A., Slonimskiy G.L., *Doklady Akademii nauk SSSR, *1949, V. XXIII, no.

3, pp. 563–571.

3. Abragam A., *The Principles of Nuclear Magnetism*, Clarendon Press, Oxford,

1961.

4. Kimmich R., NMR: *Tomography, Diffusometry, Relaxometry*, Berlin, Heidelberg,

New York: Springer-Verlag, 1997, 524 p.

5. Maklakov A.I., Skirda V.D., Fatkullin N.F., *Encyclopedia of fluid mechanics,*

*polymer flow engineering*, Self-diffusion in Polymer System: edited by

Cheremisinoff N.P., 1991, V. 9, pp. 702.

6. Maklakov A.I., Skirda V.D., Fatkullin N.F., *Samodiffuziya v rastvorakh i rasplavakh*

*polimerov *(Self-diffusion in polymer solutions and melts), Kazan': Publ.

of KSU, 1987, 224 p.

7. Khokhlov A.R., *Statisticheskaya fizika makromolekul *(Statistical physics of

macromolecules), Moscow: Publ. of MSU, 1985, 194 p.

8. Skirda, V.D., *The features of PFG NMR technique and some methodical aspects*

*of its application*, NATO science series II. Mathematics, Physics and

Chemistry, Netherlands: Springer, 2002, V. 76, pp. 245 – 254.

9. Fleischer G., Skirda V.D., Werner A., *NMR-investigation for restricted self-diffusion*

*of oil in rape seeds, *Eur. Biphys. J., 1990, V. 19, pp. 1-6.

10. Skirda V.D., Sundukov V.I., Maklakov A.I. et al., *On the generalized concentration*

and molecular mass dependences of macromolecular self-diffusion

*in polymer solutions*, Polymer, 1988, V. 29, pp. 1294–1300.

11. Aslanyan I.Yu., Skirda V.D., Zaripov A.M., *The self-diffusion of macromolecules*

*in binary blends of poly(ethylene glicol)*, Polym. Adv. Technol., 1999, V.

10, pp. 157–163.

12. Hurlimann M.D., Latour L.L., Sotak C.H., *Diffusion measurements in sandstone*

*core: NMR determination of surface-to-volume ratio and surface relaxivity*,

Magn. Reson. Im., 1994, V. 12, no. 2, pp. 325 – 327.

13. Stallmach F., Galvosas P., *Spin Echo NMR diffusion studies*, Annual Reports

on NMR Spectroscopy, 2007, V. 61, pp. 51 - 131.

Key words: oil, nuclear magnetic resonance (NMR), viscosity, rheology, self-diffusion

This paper describes the features of translational characteristics of oil molecules by using nuclear magnetic resonance method with pulsed magnetic field gradient (gradient NMR). It is shown that the rheological properties of heavy oil samples (viscosity) do not completely correlate with the measurement of self-diffusion coefficient. It is caused by distribution of oil samples according to their molecular composition and molecular weight as well as their complex supramolecular organization. It is noted that the best agreement with the viscosity characteristics is achieved via the introduction of a new average coefficient, which is a weighted sum of the inverse of the partial self-diffusion coefficients.

**
**
* *
* *
* *
* *
*
*
* *
* *

This paper describes the features of translational characteristics of oil molecules by using nuclear magnetic resonance method with pulsed magnetic field gradient (gradient NMR). It is shown that the rheological properties of heavy oil samples (viscosity) do not completely correlate with the measurement of self-diffusion coefficient. It is caused by distribution of oil samples according to their molecular composition and molecular weight as well as their complex supramolecular organization. It is noted that the best agreement with the viscosity characteristics is achieved via the introduction of a new average coefficient, which is a weighted sum of the inverse of the partial self-diffusion coefficients.

References

1. Bartenev G.M., Zelenev Yu.V., *Kurs fiziki polimerov *(The course of polymer

physics) edited by Frenkel' S.Ya., Leningrad: Khimiya Publ., 1976, 288 p.

2. Kargin V.A., Slonimskiy G.L., *Doklady Akademii nauk SSSR, *1949, V. XXIII, no.

3, pp. 563–571.

3. Abragam A., *The Principles of Nuclear Magnetism*, Clarendon Press, Oxford,

1961.

4. Kimmich R., NMR: *Tomography, Diffusometry, Relaxometry*, Berlin, Heidelberg,

New York: Springer-Verlag, 1997, 524 p.

5. Maklakov A.I., Skirda V.D., Fatkullin N.F., *Encyclopedia of fluid mechanics,*

*polymer flow engineering*, Self-diffusion in Polymer System: edited by

Cheremisinoff N.P., 1991, V. 9, pp. 702.

6. Maklakov A.I., Skirda V.D., Fatkullin N.F., *Samodiffuziya v rastvorakh i rasplavakh*

*polimerov *(Self-diffusion in polymer solutions and melts), Kazan': Publ.

of KSU, 1987, 224 p.

7. Khokhlov A.R., *Statisticheskaya fizika makromolekul *(Statistical physics of

macromolecules), Moscow: Publ. of MSU, 1985, 194 p.

8. Skirda, V.D., *The features of PFG NMR technique and some methodical aspects*

*of its application*, NATO science series II. Mathematics, Physics and

Chemistry, Netherlands: Springer, 2002, V. 76, pp. 245 – 254.

9. Fleischer G., Skirda V.D., Werner A., *NMR-investigation for restricted self-diffusion*

*of oil in rape seeds, *Eur. Biphys. J., 1990, V. 19, pp. 1-6.

10. Skirda V.D., Sundukov V.I., Maklakov A.I. et al., *On the generalized concentration*

and molecular mass dependences of macromolecular self-diffusion

*in polymer solutions*, Polymer, 1988, V. 29, pp. 1294–1300.

11. Aslanyan I.Yu., Skirda V.D., Zaripov A.M., *The self-diffusion of macromolecules*

*in binary blends of poly(ethylene glicol)*, Polym. Adv. Technol., 1999, V.

10, pp. 157–163.

12. Hurlimann M.D., Latour L.L., Sotak C.H., *Diffusion measurements in sandstone*

*core: NMR determination of surface-to-volume ratio and surface relaxivity*,

Magn. Reson. Im., 1994, V. 12, no. 2, pp. 325 – 327.

13. Stallmach F., Galvosas P., *Spin Echo NMR diffusion studies*, Annual Reports

on NMR Spectroscopy, 2007, V. 61, pp. 51 - 131.