Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas 2019-04-17T08:36:53+03:00 О.В. Паневник Open Journal Systems <p>The subjects of the “<strong>Scientific Bulletin</strong>” Journal deal&nbsp;with scientific production activities in the sphere of oil and gas industry complex and include&nbsp;the following sections:</p> <ul> <li class="show"><strong>Geology, prospecting and industrial geophysics of oil and gas fields</strong></li> <li class="show"><strong>Oil and gas engineering</strong></li> <li class="show"><strong>Machinery, equipment and supplies</strong></li> <li class="show"><strong>Transport and storage of oil and gas</strong></li> <li class="show"><strong>Measurement, control and technical diagnostics</strong></li> </ul> Research of axial force and the torque action on a drill string at rotary and combined drilling methods 2019-04-17T08:36:50+03:00 Ya. S. Hrydzhuk <p><em>The estimation approach of the work performed by the main force factors acting on the drill </em><em>string, rotary and combined drilling methods, was proposed. The problem of obtaining analytical functions of force factors action for a mechanical system with distributed parameters was formulated. </em></p> <p><em>To solve the problem, the axial load and torque functions of the drill string analysis was performed, depending on the alternating parameter - the well depth. By integrating these functions, analytical dependencies were established for determining the axial load and torque acting on the drill string in sections of directional and S-shaped wells. Relying on industrial data, numerical calculations of the size of work on sections of such wells were carried out. The obtained research results can be further used to find energy-saving modes of the drill string.</em></p> 2018-09-11T00:00:00+03:00 ##submission.copyrightStatement## Design of the recuperator on pulsating heat pipes for objects of the oil and gas complex 2019-04-17T08:36:51+03:00 I. R. Vashchyshak Ye. R. Dotsenko <p><em>The urgency of work is due to the expediency of ventilation systems development for structures and buildings with highly reliable energy-efficient recuperators. The ventilation systems of buildings and designs of air recuperators were analyzed and it wass determined that the optimum variant for a ventilation system of a private house would be a recuperator on heat pipes. The disadvantages of wick heat pipes were presented. The structure and principle of pulsating heat pipes were considered. The recuperator operation principle of pulsating heat pipes was given. A coolant was selected for the recuperator capillary vessel. The heat exchanger characteristics were calculated for pulsating heat pipes. The house ventilation system with the recuperator on the pulsating heat pipes was designed.</em></p> 2019-04-11T15:42:34+03:00 ##submission.copyrightStatement## Investigation of exhausting phenomena of gas turbine engine on the basis of wavelet analysis 2019-04-17T08:36:51+03:00 N. V. Tkacheshak М. І. Horbiichuk <p><em>The method for research of a gas turbine engine (GTE) surging phenomena based on wavelet analysis was <br> developed. GTE DG-90 was chosen for research. A wavelet decomposition of the air pressure signal was carried out using a high pressure compressor and Dobeski, Symlet, Coffle and Meyer's discrete wavelet. The advantages and disadvantages of filtering properties of these wavelets were graphically represented in the form of amplitude-frequency characteristics. Based on the results obtained, a wavelet transform parameter selection scheme based on the analysis of the frequency response of wavelet filters was constructed, and the optimum sampling time of the wavelet filtering of the investigated signal was calculated for determination of the propagation and rotational breakdown in the GTE turbocompressor. According to this scheme, among the wavelets of Dobeski, Simlet, Koefleta, and Meyer's discrete wavelet, for studying the air pressure signal at the compressor during bursting processes, the first were selected by the Dobeches and Symmetes wavelets of the 2nd order according to their filtration rate. Considering high speed and characteristics of the description of the occurrence of excite phenomena by means of a fast Fourier transform to the distribution of the wavelet coefficients of the air pressure signal by turbocompressor, for the diagnosis of unstable flows occurring in the gas path of the gas turbine trajectory (surging and rotary breakdown), the Dobeski wavelet was selected 2nd order. At the same time, to monitor the wavelet coefficients behavior, the detail of the investigated signal is necessary at the 7th level of decomposition.&nbsp;</em><em>Thus, the obtained results allow to carry out further analysis of breakdown processes using low-order wavelets.</em></p> 2019-04-11T14:00:08+03:00 ##submission.copyrightStatement## Simplified method for evaluation of the speed change on mixture formation of different liquids pumped by batching method 2019-04-17T08:36:52+03:00 М. D. Serediuk <p><em>A simplified method that allows considering the influence of linear and non-linear speed change on the mixing intensity of different oil or petroleum products in the process of sequential pumping was developed. The calculation formulas for distribution of concentrations of liquids along the length of the mixture zone, for its volume and expansion at the pipeline terminal point were proposed.'</em></p> 2019-04-11T14:22:34+03:00 ##submission.copyrightStatement## Research of consequences of emergency situations at the industrial pipelines 2019-04-17T08:36:52+03:00 H. M. Kryvenko L. V. Vozniak <p><em>The reasons of emergency situations for the long-term operated industrial pipelines were presented. It was revealed that the greatest risk of accidents at these objects is related to longitudinal destruction, which can occur both in the main metal pipes and in the weld zone, due to the formation of corrosive </em><em>“</em><em>fistulas” and </em><em>“</em><em>guillotine” </em><em>ruptures. </em><em>Industrial gas pipelines are objects of high danger. In case of the gas pipeline failure, there is a shock wave, which is one of affecting factors. </em></p> <p><em>The conditional probability of ignition of emergency emissions of hydrocarbon energy carriers was determined, considering the location of ignition sources. The probit-functions by the thermal effect on people were <br> determined. The determination method of emergency gas losses in case of pipeline rupture was developed. A <br> comparative analysis of gas mass flux at pipeline rupture was performed, depending on the pipeline diameter, initial pressure, time and distance from the point of pipe damage.</em></p> 2018-02-11T00:00:00+02:00 ##submission.copyrightStatement## Research and regulation of the corrosive damage processes atin-field gas pipeplines 2019-04-17T08:36:52+03:00 А. N. Qurbanov <p><em>The process of production, collection and transportation of hydrocarbon gases, including issues of formation outcrop, delivery of products to separation and cleaning points is based on transportation of natural and associated gas mixture, stratum water and mechanical particles over long distances. The research results show that the major part of failures of gas transporting pipelines is due to their mechanical damage or corrosion.</em></p> <p><em>The main factors of corrosion failure in pipelines are as follows: change of hydrodynamic pumping mode, <br> corrosion activity and inadequate cleaning of transported gas.</em></p> <p><em>To protect gas pipelines from failure, a method of hydrodynamic mode selection was developed to provide dependence of mechanical particles transportation on the gas flow speed. Using this method, it is possible to calculate gas regulators with consideration of actual conditions for all possible values of pressure drop within the regulator.</em></p> <p><em>To enhance the accuracy of calculations, the correction coefficient was proposed depending on has temperature and molecular weight.</em></p> 2018-02-11T00:00:00+02:00 ##submission.copyrightStatement## Research of transient processes in high-voltage transmission lines 6–10 kV and development of microelectronic special processor of relay protection, invariant to change in amplitudes of phase currents 2019-04-17T08:36:52+03:00 О. P. Liura N. Ya. Vozna Ya. M. Nykolaichuk <p><em>The fast-acting algorithms of exposure and invariant authentication of transients in the lines of electricity transmission as load surge, short circuits and start of powerful electric engines were developed; based on that, the functions of relay defense device of high-voltage lines of electricity transmission were determined. The given <br> structure of small, microelectronic fast-acting device of relay defense is with the extended functional possibilities of recognition of load surge and defense of high-voltage lines of electricity transmission from short circuits, the syntax of his functions was presented. This device can be used for load surge recognition and short circuits, invariant to the size of increase currents in the separate phases of electric lines. It allowed successful application of the <br> developed method and device for simultaneous recognition of load surge, short circuits and starting of powerful electric engines. The information technology of designing structural solutions of relay protection special processor for high-voltage electricity transmission lines was presented.</em></p> 2018-11-13T00:00:00+02:00 ##submission.copyrightStatement##