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An effect of electrokinetics phenomena on nonlinear wave propagation in bubbly liquids

Panahov G., Abbasov E., Bakhtiyarov S., Museibli P.

International Journal of Applied Mechanics and Engineering

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2021

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Vol. 26, no. 3

177--186

EN

A study of nonlinear waves in liquid-gas mixtures with the consideration of internal effects is an important problem of both the fundamental and the applied fluid mechanics. Investigation of nonlinear waves in the gas-liquid mixtures with allowance for internal effects is an important task of both fundamental and applied fluid mechanics. These problems often arise in industrial processes such as oil and gas production, hydrocarbons pipeline transportation, gas-saturated fluids flow in pipelines, etc. In this work, we investigate the effect of the internal electric field on the nonlinear wave propagation in a bubbly liquid. Numerical simulations have been conducted to study the nonlinear waves described by the nonlinear Burgers-Korteweg-de Vries equation. The numerical simulations showed that the electrokinetic processes significantly affect the wave propagation process. The amplitude of the waves gradually decreases when the size of the gas bubble is decreasing and the electrical potential increases. A good agreement of obtained results with our previous predictions is found.

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Termogazovaa intensifikacia dobyci trudnoizvlekaemoj nefti

Sahverdiev A., Panahov G., Abbasov E.

Prace Naukowe Instytutu Nafty i Gazu

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2010

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nr 170 wyd. konferencyjne

819--821

EN

In conditions of changed reserve structure of developed oil fields and increase of difficult to recovery oil part the special urgency is oil recovery by the tertiary thermal-gaseous methods based on process of displacement of residual oil by steam or hot water in a combination with carbon dioxide CO2. The main factor of the displacement mechanism with hot agents is thermal expansion of oil and viscosity decrease. In some cases hot water injection is more preferable in comparison with steam injection. Along with it recently has increased interest in so-called injection of "wet CO2", as combination of processes of thermal stimulation and solvents injection. Using CO2 as solvent in the combined technique is defined by its economic profitability, good solubility in high viscous oil promoting its "swelling", and also possibility of a reuse of gas after oil extraction. "Wet CO2" first of all provides warming up of layer, simultaneously being partially dissolved in oil. Besides this value of density of the oil saturated with carbon dioxide, and also dissolved in oil "wet CO2", become more than density of oil undersaturated with CO2. The laboratory researches show, that with dissolution in oil CO2 saturated by steam it is observed greater increase in its density, than under dissolution in it CO2 with smaller moisture content and this factor gets the special importance in the light of development of displacement mechanism. For an estimation of oil displacement efficiency from porous medium by steam and "wet CO2" a laboratory test on experimental installation has been carried out. Within the limits of the above described mechanism of combined injection of «wet CO2» the new technological decision based on an effective way of in-situ generation of "wet carbon dioxide" is offered. Saturation of generated CO2, reached by preliminary injection of gasforming and thermal agents (heat-transfer fringes — steam or hot water), provides necessary thermodynamic conditions and increases a sweep efficiency including reduction of fractals in displacement front. The technology of the method allows controlling speed and volume of generated gas, and thermobaric layer conditions and mineralization of a water basis of gas-yielding solutions — a phase state of CO2. Allocated carbon dioxide being dissolved in oil, along with viscosity change promotes density increase and, thus stimulates process of density segregation. Thus, the oil saturation on forward front of displacement increases that finally conducts to increase of oil recovery factor. From the point of view of a process efficiency increase, possibility of prevention and reduction of decrease in porous medium durability observed under hydrothermal treatment by change of pH indicator of injected agents is investigated. One of the ways to prevent montmorillonite formation is preliminary effect on the porous medium with water solution of hydrochloric acid. In the offered combined way of gas-thermal stimulation on a fields with heavy oil appropriate conditions are maintained using chemical agents participating in in-situ generation of carbon dioxide. The technological solution initially allows to prevent synthesis of new minerals — bulking up montmorillonite, and thus, to keep primary hardness of porous medium and permeability of productive collectors. It is reached by that consecutive alternate injection of hydrochloric acid water solutions and the gas-yielding agent along with forcing of the agent-heat-carrier, will reduce considerably both risk of formation of montmorillonite minerals, and reduction of hardness of porous media under bed stimulation. The technology is tested on oil fields of Russian Federation, USA, China and Azerbaijan.

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Innovacionnye tehnologii povysenia nefteotdaci plastov na osnove vnutriplastovoj generacii dioksida ugleroda

Sahverdiev A., Mandruk I., Panahov G., Abbasov E.

Prace Instytutu Nafty i Gazu

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2008

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nr 150 wydanie konferencyjne

789--793

EN

The problem of low oil recovery factor of is closely connected to а lot of negative consequences of high recovery rate maintenance during reservoir flooding. The complex of innovative EOR technologies on the basis of in situ gas generation methods is offered, providing integrative efficiency of reservoir-type systems due to coordinate technological decisions. The paper reflects last years' results of the theoretical, experimental and field works on bed stimulations methods by gas-liquid СО2 slugs. New methods exclude negative consequences of CO2 surface injection from ground communications and provide in situ gas formation and generation as а result of chemical reaction of injected water solutions of gas-yielding and gas-making chemical agents.