Нефтегазовые нанотехнологии для разработки и эксплуатации месторождений. Часть 2. Евдокимов И.Н - 23 стр.

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Nanophase-Resembling Phenomena in

Brine-Petroleum Dispersions

The output of a production oil well consists typically of a dispersion

of formation water (brine) in a crude oil. Detailed knowledge of the

properties of these dispersions is necessary if the behavior and

characteristics of multiphase flows are to be predicted correctly.

Certainly, reservoir water/oil mixtures are not “nanosystems”.

However it appears that from the practical point of view, their

properties may resemble those of the above discussed nanocolloids

in a sense that morphological behavior of water-in-oil dispersions

is characterized by well-structured “phase diagrams”. Moreover,

w/o dispersion morphology is known to be controlled by oil’s “in-

digenous surfactants” including nanocolloidal asphaltenes.

Fig. 11. Specific heat variations due to “nano-resembling” changes

in phase morphology of native w/o dispersions.

As an example, Fig.11 shows complex variations of an effec-

tive specific heat of freshly prepared w/o emulsions at 20–25°C,

subjected to microwave heating. The native crude oil was collected

a well-head at Korobkovskoye reservoir (Russia), had a density of

832 g/L, contained ca. 1 wt. % asphaltenes, 8 wt. % resins, 2 wt. %

waxes; the water was a double distillate with pH≈5.5. Sharp varia-

tions of specific heat were attributed to abrupt changes of disper-

sion’s morphology/phase state, strongly resembling those observed