Нефтегазовые нанотехнологии для разработки и эксплуатации месторождений. Часть 3. Евдокимов И.Н - 12 стр.

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mal history. The results are presented in Fig. 5. Open squares and

filled circles denote the same data as in Fig. 4. In this case a me-

tastable (transient) state in oil, subjected to pre-heating above

C is distinguished by a persistent decrease of dynamic viscosity.

In viscosity measurements we have never observed relaxation of

the oil from a metastable state (2) to a low temperature “equilib-

rium’ state (2), probably due to a comparatively smaller number of

experiments.

Fig. 4. Effects of deposition temperature

and of the thermal history of asphaltene-

rich model oil on the mass of deposits at

steel samples. Open squares – data for the

oil never heated above 28

C. Filled

circles – data for the oil at least once pre-

heated to 28

C, or to higher temperatures

(note bifurcation of low-temperature depos-

its in this data set).

Fig. 5. Effects of deposition temperature and of

the thermal history of asphaltene-rich model oil on

its dynamic viscosity. Open squares – data for the

oil never heated above 28

C. Filled circles – data

for the oil at least once pre-heated to 28

C, or to

igher temperatures. h