Dynamic blocking phenomenon of W/O emulsions in section of reservoir

On the basis of earlier experiments it is known that the flow of W/O emulsion in the slit-like model and in capillaries of different diameters leads to the fact that the mass transfer of the emulsion ceases with time at with a constant pressure drop. This phenomenon was called as a dynamic blocking effect. In the paper the radial-expanding flow of W/O dispersion in the fracture model and filtration flow in the core were studied at constant pressure drop for the presence of the blocking.

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Features of the flow of dispersions liquid-liquid type through a cylindrical microchannel

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2010.1.004 ◽

2010 ◽

Vol 7 ◽

pp. 60-71

Author(s):

A.T. Akhmetov ◽

S.P. Sametov

Keyword(s):

High Pressure ◽

Pressure Drop ◽

Physical Mechanism ◽

Blocking Effect ◽

Pressure Gradients ◽

Emulsion Flow ◽

Flow Through ◽

Dynamic Blocking ◽

Liquid Type ◽

Cylindrical Microchannel

A surprising property of W/O water-hydrocarbon emulsions is revealed which is manifested during flow in microchannels called the phenomenon of dynamic blocking. Effect essence is emulsion flow through the microchannel section ceases with time despite the constantly acting pressure drop. It was experimentally obtained that the phenomenon is observed during the flow of various emulsions of different compositions. It is shown that the phenomenon manifests itself at high pressure gradients although a partial disruption of the dispersions occurs. The paper suggests a physical mechanism for blocking water-hydrocarbon emulsions in microchannels associated with the interaction of nanoscale shells of microdroplets of water.

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Dynamic blocking and dispersions rheology at phase transition

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2011.1.007 ◽

2011 ◽

Vol 8 (1) ◽

pp. 77-91

Author(s):

A.T. Akhmetov ◽

M.V. Mavletov ◽

A.A. Valiev

Keyword(s):

Phase Transition ◽

Pressure Drop ◽

Rheological Properties ◽

Chemical Compounds ◽

Blocking Effect ◽

Dispersed Phase ◽

Simple Chemical ◽

Dynamic Blocking ◽

The Difference

In the flow in the microchannel of reverse water hydrocarbon emulsions, it is found the dynamic blocking effect. The essence of the effect is that the flow of the emulsion through the section of the microchannel stops with time, despite the permanent pressure drop. The difference of this work from previous ones is that for the experiments was prepared the emulsion of simple chemical compounds. For visualization of the structure formed in the capillary after blocking, the dispersed phase was introduced fluorescing component. It is studied and compared the rheological properties of the emulsion and formed from it in the phase transition suspension.

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Study of the effect of dynamic blocking of emulsions containing solid inclusions

Multiphase Systems ◽

10.21662/mfs2018.4.017 ◽

2018 ◽

Vol 13 (4) ◽

pp. 118-126

Author(s):

A.A. Rakhimov ◽

A.T. Akhmetov ◽

A.A. Valiev ◽

R.R. Asadullin

Keyword(s):

Pressure Drop ◽

Constant Pressure ◽

Experimental Studies ◽

Formation Water ◽

Anisotropic Particles ◽

The West ◽

Order Of Magnitude ◽

Dynamic Blocking ◽

Oil Water ◽

Oil Emulsions

The paper presents the results of experimental studies of the flow of stabilized water-oil emulsions prepared from oil and formation water from the wells of the West Kochevne field, as well as with the presence of chrysotile and aerosil in cylindrical and flat capillaries (in the crack patterns). The effect of dynamic blocking has been discovered, which consists in the fact that in sections of capillaries and in a model of cracks, with a constant pressure drop, the flow of reverse oil-water emulsions stops with time. An increase in the content of isotropic and anisotropic particles led to an increase in the viscosity of the emulsion and a decrease in the time of onset of dynamic blocking. With the same percentage of particles in emulsions containing chrysotile, the time of onset of blocking and the volume of leaked emulsion before blocking is an order of magnitude less than that of emulsions containing aerosil. However, in this case, the viscosity of the emulsion with aerosil is even higher than that of a similar emulsion with chrysotile.

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HEAT AND MASS TRANSFER COEFFICIENT AND PRESSURE DROP CORRELATIONS FOR A CROSSFLOW EVAPORATIVE COOLER

Proceeding of International Heat Transfer Conference 9 ◽

10.1615/ihtc9.740 ◽

1990 ◽

Cited By ~ 5

Author(s):

A.A. Dreyer ◽

P. J. Erens

Keyword(s):

Mass Transfer ◽

Pressure Drop ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Heat And Mass Transfer ◽

Evaporative Cooler

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Experimental study of hydrodynamic effects in the inverse water hydrocarbon emulsions flow in microchannels

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2016.1.006 ◽

2016 ◽

Vol 11 (1) ◽

pp. 30-37 ◽

Cited By ~ 1

Author(s):

A.A. Rakhimov ◽

A.T. Akhmetov

Keyword(s):

High Speed ◽

Petroleum Industry ◽

Chemical Compounds ◽

High Viscosity ◽

Blocking Effect ◽

High Speed Photography ◽

Simple Chemical ◽

Reported Study ◽

Dynamic Blocking ◽

Hydrodynamic Effects

The paper presents results of hydrodynamic and rheological studies of the inverse water hydrocarbon emulsions. The success of the application of invert emulsions in the petroleum industry due, along with the high viscosity of the emulsion, greatly exceeding the viscosity of the carrier phase, the dynamic blocking effect, which consists in the fact that the rate of flow of emulsions in capillary structures and cracks falls with time to 3-4 orders, despite the permanent pressure drop. The reported study shows an increase in viscosity with increasing concentration or dispersion of emulsion. The increase in dispersion of w/o emulsion leads to an acceleration of the onset of dynamic blocking. The use of microfluidic devices, is made by soft photolithography, along with high-speed photography (10,000 frames/s), allowed us to see in the blocking condition the deformation of the microdroplets of water in inverse emulsion prepared from simple chemical compounds.

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The effect of two-phase flow regime on hydrodynamics and mass transfer in a horizontal-tube gas-liquid reactor

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19850745 ◽

1985 ◽

Vol 50 (3) ◽

pp. 745-757 ◽

Cited By ~ 3

Author(s):

Andreas Zahn ◽

Lothar Ebner ◽

Kurt Winkler ◽

Jan Kratochvíl ◽

Jindřich Zahradník

Keyword(s):

Mass Transfer ◽

Pressure Drop ◽

Flow Regime ◽

Liquid Flow ◽

Horizontal Tube ◽

Liquid Holdup ◽

Two Phase ◽

Flow Rates ◽

Type Relation ◽

Good Agreement

The effect of two-phase flow regime on decisive hydrodynamic and mass transfer characteristics of horizontal-tube gas-liquid reactors (pressure drop, liquid holdup, kLaL) was determined in a cocurrent-flow experimental unit of the length 4.15 m and diameter 0.05 m with air-water system. An adjustable-height weir was installed in the separation chamber at the reactor outlet to simulate the effect of internal baffles on reactor hydrodynamics. Flow regime maps were developed in the whole range of experimental gas and liquid flow rates both for the weirless arrangement and for the weir height 0.05 m, the former being in good agreement with flow-pattern boundaries presented by Mandhane. In the whole range of experi-mental conditions pressure drop data could be well correlated as a function of gas and liquid flow rates by an empirical exponential-type relation with specific sets of coefficients obtained for individual flow regimes from experimental data. Good agreement was observed between values of pressure drop obtained for weirless arrangement and data calculated from the Lockhart-Martinelli correlation while the contribution of weir to the overall pressure drop was well described by a relation proposed for the pressure loss in closed-end tubes. In the region of negligible weir influence values of liquid holdup were again succesfully correlated by the Lockhart-Martinelli relation while the dependence of liquid holdup data on gas and liquid flow rates obtained under conditions of significant weir effect (i.e. at low flow rates of both phases) could be well described by an empirical exponential-type relation. Results of preliminary kLaL measurements confirmed the decisive effect of the rate of energy dissipation on the intensity of interfacial mass transfer in gas-liquid dispersions.

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