The influence of pressure on the interfacial tension of polyacrylamides

Abstract

© 2019, Neftyanoe Khozyaistvo. All rights reserved. One of the main issues of recovering heavy oil resources is their low feasibility. The perspective way to solve the given problem is developing new approaches and technologies for enhancement of well productivity, as well as oil recovery factor. Polymers and surfactants are widely applied in tertiary recovery (EOR methods). These substances provide regulated increase in viscosity of reservoir fluids and oil residue. Investigation of polymer interactions with the fluids and rocks, such as contact angle and surface tension, are very important in polymer flooding. The surface tension of polymers is a fundamental parameter in both theoretical and practical meanings. According to the results of surface tension of fluids on various interfaces one can evaluate the behavior of fluids interaction with solid substances, adsorption processes, qualitative and quantitative compositions of polar components in liquids, intensity of capillary forces, etc. The interfacial tension dependency of Sofrpusher and Seurvey R1 polymers from concentration under the pressure is revealed. The structural changes occurring in the system provides increase in the degree of packing polymer molecules in the interfaces of polymer-inert gas. Under the high pressure, and inert gas environment, the polymers swell due to low solubility of nitrogen in polymer solution. The specific property, regarding conformation state of PAA macromolecule, is observed, which is based on transition from elongated form to the ball of polymer. The latter continues swell more taking form from the energy point of view. The lowest interfacial tension for both polymers in all concentrations corresponds to the atmospheric pressure runs.