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

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

doi:10.23939/chcht13.04.465

Cited by 2 publications

(3 citation statements)

References 11 publications

(18 reference statements)

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“…The experimental data are fully explained by a strong deformation effect of the hydrodynamic field on molecular bundles of the polymer. In a previous study) 11 , the transition of the bundle-expanded chain at a convergent flow (in the model conditions of the nozzle of the hydro perforator) of aqueous solutions of PEO was All this supports the claim that the high-velocity water-polymer jet is "reinforced" by highly developed macromolecular chains of the polymer, and -considering the results from 3 -then supramolecular structures. Part of the energy goes to the structural adjustment of the flow, 2,11 which lowers the average flow rate of the aqueous polymer solution and improves the quality of its formation, as a jet with small polymer additives is more compact (has a smaller diameter) than water see Figure 1 and Table 1.…”

Section: Resultssupporting

confidence: 72%

“…4 This is primarily due to the interest in work on the dynamics of polymer chains in convergent flows, because a strong deformation effect on macromolecular coils must take place in the inlet of the nozzle of the hydroperforator. 10,11 The most significant results in the study of the structural changes in polymer solutions under the action of a homogeneous longitudinal hydrodynamic field were obtained by Brestkin. 8 The main result of this work is the proof that in the conditions of a homogeneous longitudinal hydrodynamic field, dynamic phase transitions are possible.…”

Section: Trends In Petroleum Engineeringmentioning

confidence: 99%

“…Analysis of the concentration dependence of the destructive capacity of polymer solutions and the results indicating on formation of dynamic supramolecular structures in polymer solutions suggest that approaching the optimal concentration of polymer (C ≥ C opt ), the destructive capacity of water generates anisotropic supramolecular formations that have a lifetime 10 times longer than the relaxation time of the macromolecule. 11 A further increase in the PEO con-centration led to the creation of conditions for the interaction between individual molecules of PEO, even without the action of a hydrodynamic field. This leads to a sharp increase in the usual viscosity and, of course, to a relatively strong decrease in the flow rate of the aqueous solution.…”

Section: Adsorption) Studies Of Solutions In a Stationarymentioning

confidence: 99%

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The Water-Polymer Method of Hydroperforation of Oil and Gas wells

Pogrebnyak¹

2023

TPE

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The aim of the study is to develop an efficient, innovative method of perforating oil and gas well casing strings with a high-velocity stream of polymer solution that conserves resources and energy and meets the requirements for environ- mentally friendly hydrocarbon production. New knowledge about the dynamics of polymer solutions in the model conditions of flow through the nozzles of the hydro perforator, which form a high-velocity jet, became the main scientific basis for substantiating the water-polymer method of hydro perforation of oil and gas wells. The study of the reaction of polymer solutions to tension hydrodynamic influence allowed to formulate a structural concept, the "common denominator" of which is the strong deformation effect of tension hydrodynamic field on high molecular weight coils, which, according to nonequilibrium thermodynamics, should cause a kind of high elasticity. Peculiarities of hydrodynamic behavior of aqueous polymer solutions in model conditions of flow through jet-forming nozzles are studied. The possibility of transition to a highly developed state of the tangle of polyethylene oxide macromolecules in the conditions of the inlet section of the nozzle of the hydro perforator has been experimentally proved. The mechanism of perforation of oil and gas wells by a high-velocity jet of an aqueous polymer solution has been elucidated. It is proved that the mechanism of the high cutting ability of the high-velocity jet of aqueous polymer solution is the destructive effect of the dynamic pressure of water-polymer jet "reinforced" by highly developed macromolecular chains in the inlet nozzles of the hydro perforator nozzles under the action of tensile leakage. Experimental and industrial testing of the method of perforation of wells by a high-speed jet of an aqueous solution of polyethylene oxide confirmed the practical and economic feasibility of its use.

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Section: Resultssupporting

confidence: 72%

Section: Trends In Petroleum Engineeringmentioning

confidence: 99%

Section: Adsorption) Studies Of Solutions In a Stationarymentioning

confidence: 99%

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The Water-Polymer Method of Hydroperforation of Oil and Gas wells

Pogrebnyak¹

2023

TPE

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Maxwell fluid flow in system supplying hydrodynamically active polymer to boundary layer of streamlined object

Pogrebnyak¹,

Pogrebnyak²,

Perkun³

2020

Math. Model. Comput.

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The article presents the results of the numerical simulation of the Maxwell fluid flow in the system supplying hydrodynamically active polymer in the boundary layer of a streamlined object. The case of slow flow is considered. In this case, the inertial terms can be neglected, the velocities, stresses, and stream functions can be written as the decomposition by Weisenberg number, and we can assume that the Weissenberg number is less than one. The established features of the behaviour of the Maxwell fluid flow with a longitudinal velocity gradient and the manifestation of the effects of elastic deformations are crucial for understanding processes taking place in the system supplying hydrodynamically active polymer in the boundary layer of a streamlined object. Understanding the nature of the effects of elastic deformations in the supplying system makes it possible to offer a hydrodynamic calculation of the modes of polymer solution injection into the boundary layer without any negative manifestations of the effects of the elastic deformations. The results of the numerical simulation confirmed the conception on the deformation-stress state of macromolecules (fluid elements) in polymer solution converging flow, based on the data previously obtained from experimental decisions concerning the hydrodynamic field structure in the input area of a slot and other openings.

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

Cited by 2 publications

References 11 publications

The Water-Polymer Method of Hydroperforation of Oil and Gas wells

The Water-Polymer Method of Hydroperforation of Oil and Gas wells

Maxwell fluid flow in system supplying hydrodynamically active polymer to boundary layer of streamlined object

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