Degradation of Polymer Solutions in a Hydrodynamic Field with a Longitudinal Velocity Gradient

Pogrebnyak, A. V.; Perkun, I. V.; Pogrebnyak, V. G.

doi:10.1007/s10891-017-1677-8

Cited by 8 publications

(11 citation statements)

References 2 publications

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“…Исходя из этого, утверждается, что водяная струя с малыми добавками полимера имеет большую скорость и динамическое давление, чем струя чистой воды, при одинаковых перепаде давления и диаметре насадки, а следовательно, интенсивнее разрушает материал. В работе [15] высокая разрушающая способность высокоскоростной струи рас- твора полимера связывается с деформационными эффектами, проявляющимися при течении с растяжением водных растворов полимеров. Ниже речь пойдет об опытах, которые были поставлены с целью внесения большей ясности в вопрос механизма повышенной разрушающей способности водополимерных струй.…”

Section: результаты и их обсуждениеunclassified

“…В работах [16,17] доказана возможность почти полного разворачивания макромолекул при сходящемся течении (в модельных условиях насадки гидроперфоратора) водных растворов ПЭО при достижении некоторого критического продольного градиента скорости и, как следствия этого, фазового перехода клубок-развернутая цепь. Отношение измеренного двойного лучепреломления к предельно возможному достигает 0.35-0.46, что соответсвует 60-70% степени развернутости макромолекулярного клубка.…”

Section: результаты и их обсуждениеunclassified

“…Учитывая результаты работ [16,19], полученные экспериментальные данные (табл. 1-3) вполне объясняются с точки зрения сильного деформационного воздействия гидродинамического поля на молекулярные клубки в условиях входной области насадки.…”

Section: результаты и их обсуждениеunclassified

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High-efficiency casing perforation oil and gas wells

Pogrebnyak¹,

Chudyk²,

Pogrebnyak³

et al. 2021

SOCAR Proceedings

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The energetic capabilities of a high-speed jet of an aqueous solution of polyethylene oxide (PEO) with varying concentration and different outflow pressures from a jetforming nozzle were investigated using the length of the forming channel in the model of the casing of an oil and gas well, cement sheath and rock layer, as well as impact of the jet force on a metal plate fixed on a physical pendulum. The experimental data made it possible to obtain a calculated dependence in a dimensionless form to determine the quality (initial sections) of jets of aqueous solutions with different concentrations and molecular weights of PEO, considering the real parameters of the jet-forming nozzles of the hydroperforator. A comprehensive study of the perforation process made it possible to substantiate the mechanism of the high destructive capacity of a high-speed jet of polymer solution. It has been established that the mechanism of the high destructive capacity of the polymer water jet is not due to the Toms effect, but caused by the destructive action of the dynamic pressure of the polymer water jet «reinforced» by strongly unfolded macromolecular chains under the action of a tensile flow in the inlet area of the jet forming nozzle of the hydroperforator. Keywords: perforator; jet nozzle; jet quality; casing; cement sheath; rock; Toms effect.

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Section: результаты и их обсуждениеunclassified

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High-efficiency casing perforation oil and gas wells

Pogrebnyak¹,

Chudyk²,

Pogrebnyak³

et al. 2021

SOCAR Proceedings

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“…One of the main features of the polymer solution is the ability to equalize the front of oil displacement in a reservoir with a layered heterogeneity under specific conditions [7,8]. To clarify the mechanism and conditions for the demonstration of such properties polymer solutions, it is necessary to study the features of their flow in the model conditions of a porous medium, which (in the first approximation) are realized under convergent flow [8,9]. Another practically important task with the use of polymer solutions is a water-polymer hydraulic cutting [10].…”

Section: Introductionmentioning

confidence: 99%

Coil-Uncoiled Chain Transition of Polyethylene Oxide Solutions under Convergent Flow

Pogrebnyak¹,

Chudyk²,

Pogrebnyak³

et al. 2019

ChChT

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The coil-uncoiled chain transition under convergent flow of polyethylene oxide aqueous solutions has been studied. The possibility of this transition has been confirmed by the experiments. The fields of velocities and their gradients arising at the entrance of a small capillary during the convergent flow have been examined. It was found that water-polyethylene oxide system under convergent flow and certain flow regimes is self-regulating one with a negative feedback. The latter manifests itself in the following: accelerated longitudinal gradients of velocity lead to deformation of macromolecular coils, followed by a rearrangement of the flow in such a way as to increase the impact time of the longitudinal velocity gradient on macromolecules. The hydrodynamic field arising under the convergent flow provides a considerable degree of polymer uncoiling and coil-uncoil chain transition.

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“…Оскільки водні розчини ПЕО і ПАА (а також і інших полімерів) значно міняють свої властивості при тривалому зберіганні, заздалегідь були вивчені закономірності процесу старіння їх у воді і підібрані стабілізатори, що його виключають. Як стабілізатор використовували 0,05 % домішку йодистого калію в розчини ПЕО і ПАА, який практично повністю виключає старіння цих полімерів у воді при зберіганні і не впливає на їх гідродинамічну активність [12].…”

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Improvement of Occupational Safety at Oil and Gas Object Territories by Increasing Efficiency of Water Fire Suppression System

Voloshenko¹,

Pohrebniak²,

Kulyk³

et al. 2019

RRNGR

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An analysis of working conditions of rescue service and operational personnel during a fire has been conducted, when open fire is one of the dangerous factors, especially at the oil and gas object territories. It is also considered to be quite an important environmental factor, which under certain circumstances leads not only to deterioration of working conditions of operational personnel at a particular facility, but also to severe environmental pollution. This is especially true of firefighters, rescuers and other civil protection workers who are subjected to harmful effects of high temperature, thermal radiation, as well as hazardous combustion products while eliminating emergency situations. Improvement of working conditions during emergency rescue operations can be achieved by reducing their conduct time, as well as by increasing a distance between a rescuer and ignition point. This can be achieved by using fire extinguishing solutions with additives of surface active agents and polymers in fire suppression systems. These substances are introduced into fire hoses and pipelines, which allows to increase the expense of extinguishing solution, flow range from the jet nozzle and reduce duration of fire suppression operation. The laboratory conducted experiments allowed to select a specific polymer - polyethylene oxide, its molecular weight and solution concentration, which provides the maximum possible reduction of hydraulic resistance in a fire hose and a jet nozzle.

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Degradation of Polymer Solutions in a Hydrodynamic Field with a Longitudinal Velocity Gradient

Cited by 8 publications

References 2 publications

High-efficiency casing perforation oil and gas wells

High-efficiency casing perforation oil and gas wells

Coil-Uncoiled Chain Transition of Polyethylene Oxide Solutions under Convergent Flow

Improvement of Occupational Safety at Oil and Gas Object Territories by Increasing Efficiency of Water Fire Suppression System

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