Petroleum disperse systems. (Lecture 3) презентация

PDS. Shchukin-Rehbinder criterion
Some challenges of Petroleum Industry, connected with PDS exploitation, treatment, transport and refining

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lecture 3

interactions on the phase boundary leads to the fact that the phase boundary surface has an uncompensated excess energy (energy aspect), σ [erg/cm2, J/m2] and causes the appearance of a tangential force (power aspect), σ [din/cm, N/m]
* The term "interphase boundary" is usually attributed to the boundary between two immiscible phases, the term "surface" indicates that one of the phases is a gas, usually air

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lecture 3

lyophobic due to value
of interfacial interactions at the interface

Shchukin-Rehbinder criterion 4πr2σ ~ γkT,where
r - particle size,
T-temperature,
K - Boltzmann constant,
 - dimensionless coefficient


Calculation shows, that at standart conditions
σcrit~ 0,01-0,1 mN/m

Lyophilic ODS σ < σcrit
Lyophobic ODS σ > σcrit

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liquid (interphase boundary)
Solid body – solid body
liquid – gas (surface)
liquid-liquid (interphase boundary)

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pipeline sides

Decrease of PTA penetration
Decreasing of flow area of wells elevator and oilfield pipeline;
Bottom deposits accumulation in reservoirs, separators and etc.

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(pig trap area)

Changing of thermobaricе conditions in PTA;
Рпл – Рн > 8 – 10 МPа;
Presence of contamination;
Formation of trolly-oil;
Practice of incongruent chemicals (isopropil alcohol, methanol, propanone, solvents);
Acid treatment and other chemical methods of intensification of oil inflow from the bench

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heaters

14/09/16

lecture 3