New data on the polymer solutions’ dynamics in the model conditions of flow through the hydroperforator nozzles, which form a high-velocity jet, has become the main scientific basis for substantiating the water-polymer method of hydroperforation of oil and gas wells. The study of the reaction of polymer solutions to tension hydrodynamic influence allowed us to formulate a structural concept, the "common denominator" of which is the strong deformation effect of tension hydrodynamic field on macromolecular coils, which, according to nonequilibrium thermodynamics, should cause a particular kind of rubber-like high elasticity. Peculiarities of hydrodynamic behaviour of aqueous polymer solutions in model conditions of flow through jet-forming nozzles have been studied. The flow photographs of polyethylene oxide aqueous solution in the nozzle inlet, obtained in crossed polaroids, indicate the localization of the birefringent zone near the flow axis. 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 hydroperforatorhas been experimentally proved. The ratio of the measured birefringence to the maximum possible reaches 0.35–0.46, which corresponds to 60–70% of the macromolecular coils deployment degree. The mechanism of perforation of oil and gas wells by a high-velocity jet of an aqueous polymer solution has been elucidated. It has been proved that the high cutting ability mechanism of the aqueous polymer solution high-velocity jet is the destructive effect of the dynamic pressure of water-polymer jet "reinforced" by highly developed macromolecular chains in the inlet hydroperforator nozzles under the action of tensile flow. Experimental testing of the well perforation method by a high-speed jet of the polyethylene oxide aqueous solution has confirmed the practical and economic feasibility of its use
Received 06.10.2021
Revised 18.01.2022
Accepted 01.03.2022
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