CONTENTS Oil and Gas Exploration and Production R. S. Yakym, D. Yu. Petryna Increase of durability of three-cone rock bit cutters 49 A. V. Buketov, 0. 0. Sapronov, О. V. Leshchenko, S. V. Voronenko Use of dispersive additives to ensure high indicators of physico-mechanical properties of functional polymer coatings 54 A. V. Buketov, M. Yu. Amelin, R. Yu. Negrutsa, A. V. Sapronova, О. M. Bezbach, S. V. Voronenko Increasing the reliability of the equipment of oil and gas transportation industry due to polymeric nanocomposites 64 Oil and Gas Transportation Ya. V. Doroshenko, L. D. Pylypiv, K. A. Poliarush, Yu. I. Doroshenko The study of the stress-strain state of trunk gas pipeline sections with defects in the shape of the cross-section of the pipe 68 A. Klyun, M. Karpash, I. Trebulova, G. Kogut Experience of operation of electronic database of full-text standards HAMMER in PJSC "Ukrtransgaz" 80 М. V. Panchuk, L. S. Shlapak, N. Theremko, M. Szkodo, W. Kieіczynski, S. O. Kishka Study of the influence of thermal factors on the welding process of polyethylene gas pipelines 89 Oil and Gas Measurement and Testing I. V. Lytvynenko The method of segmentation of stochastic cyclic signals for the problems of their processing and modeling 93