CONTENTS Oil and Gas Exploration and Production BombaA.Ya., Myslyuk M. A., Yaroshchak S. V. Mathematical modeling of thermodynamic effects in well bore zone of gas formation under hydraulic fracturing conditions..............................1 Zarubin Yu. A., Gunda M. V., Yurova M. I., Zazulyak О. М. Parameterization permeability curves for the simulation of oil displacement with gas and water at pressures below the saturation pressure......................6 Kopey B. V., Kryvonozhko T. A. Development of vertical and horizontal vortex type separator for subsea application...................15 Oil and Gas Transportation Grudz V. Ya., Al-Dandal R. S. Non-stationary processes in oil-product pipeline using anti-turbulence additives....................19 Kostyshyn V. S., Kurlyak P. O. Simulation of performance characteristics of centrifugal pumps by the electro-hydrodynamic analogy method.................................24 Oil and Gas Measurement and Testing OlijnykA. P., MorozA. A. Application of mathematical methods for condition monitoring of oil and gas facilities......32