Organizational Model of Management Seismic Survey Projects in PJSC Gazprom Neft (Russian)

Entropy change at viscous flow of dispersive systems with a phase transition in their particles

“…It was assumed in [2][3][4] that they are induced in ODSs by a phase transition driven by the melting of paraffins contained in these ODSs. However, it was demonstrated in [5] that the phase transition corresponding to the melting of paraffins in ODSs induces bends in the dependences of ln µ on 1/T at T < 273 K, while bends in the dependences of ln µ on 1/T for ODSs and MDSs were observed in [6,7] at T * ∼ 313 ± 5 K regardless of the melting temperatures of their components (systems with T * ∼ 313 ± 10 K have been found by now).…”

“…The cause of this effect is found out by analyzing the equality of DS temperatures T * and T * * = 1/βR demonstrated in Fig. 2, which suggests that the range of variation of these temperatures should be governed by the values of coefficient β in (4), (5). The results of calculations confirmed that the values of β = (384 ± 12) • 10 −6 mol/J and the range of variation of T * = T * * = 313 ± 10 K for the studied ODSs and MDSs agree well, thus effectively confirming the validity of relations (5), (6) for S and G determined in the present study.…”

“…Liquid DSs with a liquid-like state of particles, the size of which may be changed by temperature, shear strain, and phase transitions, are even less well understood. Oil dispersed systems (ODSs) with dispersed phase particles taking the form of nanoaggregates of asphaltene, resin, and paraffin molecules [2][3][4][5][6][7][8] are the examples of such systems. It has been demonstrated in [7,8] that liquid concentrated micellar dispersed systems (MDSs) with dispersed phase particles taking the form of micelles of surfactants and their aggregates are similar to ODSs in their viscous properties.…”