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

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

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2008.1.002 ◽

2008 ◽

Vol 6 ◽

pp. 19-25

Author(s):

A.T. Akhmetov ◽

A.A. Rakhimov ◽

S.P. Sametov

Keyword(s):

Mass Transfer ◽

Pressure Drop ◽

Constant Pressure ◽

Blocking Effect ◽

Fracture Model ◽

Filtration Flow ◽

The Core ◽

Dynamic Blocking ◽

Different Diameters

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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Diagnostics of metal samples using the results of experimental and theoretical study of positively charged microparticles formed upon sample destruction

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2018-84-10-23-28 ◽

2018 ◽

Vol 84 (10) ◽

pp. 23-28

Author(s):

D. A. Golentsov ◽

A. G. Gulin ◽

Vladimir A. Likhter ◽

K. E. Ulybyshev

Keyword(s):

Experimental Data ◽

Early Stage ◽

Experimental Studies ◽

Material Model ◽

Total Charge ◽

Cross Sectional ◽

Practical Applications ◽

Mechanical And Electrical Properties ◽

Order Of Magnitude ◽

Using Data

Destruction of bodies is accompanied by formation of both large and microscopic fragments. Numerous experiments on the rupture of different samples show that those fragments carry a positive electric charge. his phenomenon is of interest from the viewpoint of its potential application to contactless diagnostics of the early stage of destruction of the elements in various technical devices. However, the lack of understanding the nature of this phenomenon restricts the possibility of its practical applications. Experimental studies were carried out using an apparatus that allowed direct measurements of the total charge of the microparticles formed upon sample rupture and determination of their size and quantity. The results of rupture tests of duralumin and electrical steel showed that the size of microparticles is several tens of microns, the particle charge per particle is on the order of 10–14 C, and their amount can be estimated as the ratio of the cross-sectional area of the sample at the point of discontinuity to the square of the microparticle size. A model of charge formation on the microparticles is developed proceeding from the experimental data and current concept of the electron gas in metals. The model makes it possible to determine the charge of the microparticle using data on the particle size and mechanical and electrical properties of the material. Model estimates of the total charge of particles show order-of-magnitude agreement with the experimental data.

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Study on the pressure drop of crude oil-water with surfactant flow in porous media

Journal of Dispersion Science and Technology ◽

10.1080/01932691.2021.1950548 ◽

2021 ◽

pp. 1-7

Author(s):

Huijun Zhao ◽

Xiang Ding ◽

Pengfei Yu ◽

Yun Lei ◽

Xiaofei Lv ◽

...

Keyword(s):

Porous Media ◽

Pressure Drop ◽

Crude Oil ◽

Flow In Porous Media ◽

Oil Water

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Research on the viscosity of stabilized emulsions in different pipe diameters using pressure drop and phase inversion

Experimental and Computational Multiphase Flow ◽

10.1007/s42757-020-0102-2 ◽

2021 ◽

Author(s):

Jose Plasencia ◽

Nathanael Inkson ◽

Ole Jørgen Nydal

Keyword(s):

Pressure Drop ◽

Salt Water ◽

Flow Behavior ◽

Turbulent Viscosity ◽

Relative Viscosity ◽

Cfd Modeling ◽

Water Fraction ◽

Water Fractions ◽

Oil Emulsions ◽

Mixture Velocity

AbstractThis paper reports experimental research on the flow behavior of oil-water surfactant stabilized emulsions in different pipe diameters along with theoretical and computational fluid dynamics (CFD) modeling of the relative viscosity and inversion properties. The pipe flow of emulsions was studied in turbulent and laminar conditions in four pipe diameters (16, 32, 60, and 90 mm) at different mixture velocities and increasing water fractions. Salt water (3.5% NaCl w/v, pH = 7.3) and a mineral oil premixed with a lipophilic surfactant (Exxsol D80 + 0.25% v/v of Span 80) were used as the test fluids. The formation of water-in-oil emulsions was observed from low water fractions up to the inversion point. After inversion, unstable water-in-oil in water multiple emulsions were observed under different flow regimes. These regimes depend on the mixture velocity and the local water fraction of the water-in-oil emulsion. The eddy turbulent viscosity calculated using an elliptic-blending k-ε model and the relative viscosity in combination act to explain the enhanced pressure drop observed in the experiments. The inversion process occurred at a constant water fraction (90%) and was triggered by an increase of mixture velocity. No drag reduction effect was detected for the water-in-oil emulsions obtained before inversion.

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Dispersion Flow in Microchannels

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D ◽

10.1115/imece2012-86618 ◽

2012 ◽

Cited By ~ 2

Author(s):

Alfir T. Akhmetov ◽

Marat V. Mavletov ◽

Sergey P. Sametov ◽

Artur A. Rakhimov ◽

Azat A. Valiev ◽

...

Keyword(s):

Aqueous Phase ◽

Effective Viscosity ◽

Complex Structure ◽

Experimental Investigations ◽

Dispersed Phase ◽

Rheological Characteristics ◽

Dense Structure ◽

The Third ◽

Dynamic Blocking ◽

Oil Emulsions

The work is devoted to experimental investigations of the features of flow of dispersions in microchannels. The paper consists of three parts. In the first part the flow of emulsions in smooth contracting cylindrical microchannels is investigated. It is received that a significant role at dynamic blocking of channels is played by the inclusions comparable by size to the diameter of a narrowing. This is in spite of the fact that their influence on the change of a flow rate of emulsion before blocking is insignificant. In the second part the generation of emulsion in a complex structure of microchannels (micromodels) when water is displaced by composition of hydrocarbon with surfactants is investigated. The experimental dependences of the rheological characteristics of emulsions based on the composition of SAS and water at different concentrations of the aqueous phase can explain blocking of a porous structure by generated emulsion. In the third part a comparison of flow of water-in-oil emulsions with the suspension which was obtained by freezing the microdroplets of the aqueous phase of emulsions was studied. It was found that the blocking of suspension is not as complete as in the case of emulsion. It is explained by deformation of the droplets and by formation of a dense structure, as opposed to suspension of beads, through which hydrocarbon phase is filtered. A small increase in effective viscosity due to solidification of freezing droplets of the dispersed phase was found.

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Steam-foam performance in oil sand cores at constant pressure drop

Fuel ◽

10.1016/0016-2361(91)90218-y ◽

1991 ◽

Vol 70 (11) ◽

pp. 1303-1307 ◽

Cited By ~ 3

Author(s):

M.Kirk Green ◽

E.Eddy Isaacs ◽

John M. Smid

Keyword(s):

Pressure Drop ◽

Constant Pressure ◽

Oil Sand

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Efficient and High-Quality Seeded Graph Matching: Employing Higher-order Structural Information

ACM Transactions on Knowledge Discovery from Data ◽

10.1145/3442340 ◽

2021 ◽

Vol 15 (3) ◽

pp. 1-31

Author(s):

Haida Zhang ◽

Zengfeng Huang ◽

Xuemin Lin ◽

Zhe Lin ◽

Wenjie Zhang ◽

...

Keyword(s):

Large Scale ◽

Graph Matching ◽

Structural Information ◽

Experimental Studies ◽

Higher Order ◽

Personalized Pagerank ◽

Matching Accuracy ◽

Approximation Techniques ◽

Order Of Magnitude ◽

Matching Score

Driven by many real applications, we study the problem of seeded graph matching. Given two graphs and , and a small set of pre-matched node pairs where and , the problem is to identify a matching between and growing from , such that each pair in the matching corresponds to the same underlying entity. Recent studies on efficient and effective seeded graph matching have drawn a great deal of attention and many popular methods are largely based on exploring the similarity between local structures to identify matching pairs. While these recent techniques work provably well on random graphs, their accuracy is low over many real networks. In this work, we propose to utilize higher-order neighboring information to improve the matching accuracy and efficiency. As a result, a new framework of seeded graph matching is proposed, which employs Personalized PageRank (PPR) to quantify the matching score of each node pair. To further boost the matching accuracy, we propose a novel postponing strategy, which postpones the selection of pairs that have competitors with similar matching scores. We show that the postpone strategy indeed significantly improves the matching accuracy. To improve the scalability of matching large graphs, we also propose efficient approximation techniques based on algorithms for computing PPR heavy hitters. Our comprehensive experimental studies on large-scale real datasets demonstrate that, compared with state-of-the-art approaches, our framework not only increases the precision and recall both by a significant margin but also achieves speed-up up to more than one order of magnitude.

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