Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge <p>The journal publishes materials based on the results of scientific and productive activity in the field of oil and gas complex in the following directions:</p> <p>Geology, exploration and geophysics of oil and gas fields</p> <p>Scientific and technical problems of petroleum engineering</p> <p>Materials, structures and equipment of petroleum complex facilities</p> <p>New solutions in modern equipment and technology</p> en-US ngejournal@nung.edu.ua (A. P. Dzhus) ngejournal@nung.edu.ua (vizd) Wed, 26 Jun 2019 00:00:00 +0300 OJS 3.1.2.1 http://blogs.law.harvard.edu/tech/rss 60 COMPLEX GEOPHYSICAL STUDIES OF THE IVANO-FRANKIVSK NATIONAL TECHNICAL UNIVERSITY OF OIL AND GAS TERRITORY http://nge.nung.edu.ua/index.php/nge/article/view/488 <p><em>The results of high-precision integrated geophysical studies of the Ivano-Frankivsk National University <br>territory are presented. Research methods used are electrical prospecting and gravity and magnetic prospecting. According to the results of geodetic measurements and field geophysical observations, heights maps of the territory, regional components and detailed maps of local anomalies of the gravitational and magnetic fields, and also, according to the data of vertical electrical sounding, geoelectric sections along interpretation profiles were constructed. For the construction data on the geological and tectonic structure of the section to the depths of the first hundred meters were used, as well as geophysical materials obtained in previous years through of the Ivano-Frankivsk city territory. The analysis of the general behavior of the regional components of the gravimagnetic fields and morphology of geophysical anomalies was performed. The geological interpretation of the identified individual local gravitational and magnetic anomalies is presented. A regional field of gravity tends to increase in the direction of increasing heights in the study area and the regional magnetic field has an insignificant, but inverse relationship. A series of positive small intensity local anomalies of the field of gravity is probably due to the rocks of the Kosovska and Tyraska suite, for example, compacted carbonates or anhydrites. Local magnetic anomalies have a relatively small intensity ranging from -100 nTl to 50</em><em>0 nTl and due mainly to university facilities and communications. According to the results of the analysis of the intensity of geophysical fields, a general forecast estimate of the ecological state of the research area is presented. The obtained field intensity values are much lower than the sanitary norms.</em></p> M. V. Shtogryn, S. G. Anikeyev, O. O. Synytska Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/488 Wed, 26 Jun 2019 00:00:00 +0300 EVALUATION OF DESIGN PARAMETERS OF ORIENTED ASSEMBLIES TO PROVIDE THEIR DESCENT IN THE DIRECTIONAL WELL http://nge.nung.edu.ua/index.php/nge/article/view/477 <p><em>This scientific publication proposes a new method for assessing the impact of technical and </em><em>technological parameters of oriented slick assemblies and assemblies </em><em>with one stabilizer on their passage in </em><em>the directional well. The analysis of possible cases of contact of elements of oriented assemblies with well walls is carried out. </em><em>According to the results of this analysis a number of mathematical models of oriented bottom hole </em><em>assemblies </em><em>for calculating the power parameters of the interaction of their elements with the well walls during descent into a well with an arbitrary zenith angle are developed. Using the developed mathematical models, a study of the influence of the design parameters of the oriented assemblies </em><em>on their axial passage in the wellbore to prevent of their jamming </em><em>has been carried out. </em></p> <p><em>The calculated mathematical models of the assemblies are based on the method of differential equations of second order. The research is focused on obtaining the value of the conditional diameter of the assembly, taking into account its deformation from the effect of the transverse component of the weight. On the example of oriented slick assemblies and those with one stabilizers on the basis of the mud motor, a calculation of the value of the conditional diameter of the assembly and the diameter of the stabilizer from the condition of observing the optimal diameter of the assembly has been performed.</em></p> <p><em>According to the results of analytical studies on the example of slick assemblies and assemblies </em><em>with one stabilizer, using the developed approach, the authors have established the following: conditions for their free passage in the wellbore along the entire range of the zenith angle change; the necessity to control the passage and axial displacement of the oriented assemblies in the performance of tripping operations; the dependency of the value of the "conditional" diameter of the oriented assembly on the position of the bent angle of the toolface to the well trajectory. In particular, in the upper position of the bent angle of the toolface, the "conditional" diameter of the assembly is smaller than in the lower position, and an increase of the zenith angle of the wellbore leads to a decrease in the "conditional" diameter of the oriented assembly due to its laying under the action of the transverse component of the weight.</em></p> I. I. Chudyk, A. M. Livinskyi, Achmed Al Tanakchy, A. M. Pastuch, Elnur Nuruzade Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/477 Wed, 26 Jun 2019 00:00:00 +0300 CAUSES OF POOR QUALITY CASING OF DIRECTIONAL WELLS AT THE DRILLING DEPARTMENT «UKRBURGAZ» AND METODS FOR THEIR ELIMINATION http://nge.nung.edu.ua/index.php/nge/article/view/487 <p><em>The analysis of modern studies and field data relating to directional wells casing at the enterprises of “Ukrburgas” drilling company has been carried out in the article. In particular, complications with casing strings, which happened when casing directional wells at these enterprises, data on the non-admission of casing strings to the total depth, a brief description of works aimed at restoring the quality of well casing, are considered. Main reasons of complications, damages and failures during well casing process have been determined. It has been found out that casing string failures mostly happened in the areas of intensive wellbore deviation. The reasons of directional wells poor quality casing taking into account the results of new theoretical, experimental and field research have been systemized. Cases of wells poor quality casing are supposed to be divided into two groups: 1) casing strings damage, 2) non-admission of casing strings to the total depth and violation of string integrity. Each of the groups is classified in accordance with the types of poor casing. The main reason of directional wells poor quality casing are failures caused by wrong casing strength calculations, violation of casing well technology, casing strings wear, mining and geological conditions. The non-admission of the columns to the total depth and poor-quality joining of sections are minor, which arise due to the low passability of the well, inaccurate determination of the depth of the well, geological conditions, etc. Measures to prevent complications, damages and accidents during well casing, in particular, work on forming the necessary wellbore profile, maintaining the design parameters of drilling fluid, and compliance with the requirements of enterprise standards during preparation works, lowering, cementing and final casing works have been worked out.</em></p> I. M. Kovbasiuk, O. B. Martsynkiv, B. O. Martsynkiv Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/487 Wed, 26 Jun 2019 00:00:00 +0300 OPTIMIZING THE MODES OF COMPRESSOR STATIONS UNDER THE CONDITIONS OF THEIR PARTIAL LOAD http://nge.nung.edu.ua/index.php/nge/article/view/476 <p><em>The principle of construction of stochastic and deterministic mathematical models for prediction of operating modes of gas pumping units at compressor stations of main gas pipelines and their optimization in conditions of incomplete loading of the gas transmission system is proposed. Calculation of the parameters of the technological mode of operation of the compressor stations of gas pumping units is based on the use of combined characteristics of centrifugal superchargers, the processing of which by means of mathematical statistics allowed to obtain analytical expressions for the characteristics models. The calculation method can be implemented for forecasting the operation modes of the compressor station in conditions of both single-stage and multi-stage compression of gas. The source data for the calculation comprise the upstream and downstream pressure and temperature of gas, the volume of pumping and physical properties of the gas. In order to predict operating modes of compressor stations, the optimal distribution of load between workshops equipped with multi-type gas-pumping units is carried out provided that the energy consumption is reduced to compress the given volume of gas under known boundary conditions. The principle of constructing an optimality criterion for conditions of incomplete loading of the gas transmission system is shown.</em></p> <p><em>To illustrate the proposed method of optimizing the operation modes of compressor stations under incomplete loading, we give an example of the calculation of optimal operating modes of a hypothetical two-seater compressor station with various types of aggregates. The calculation is based on the construction of analytical mathematical models of their characteristics on the criterion of minimum capacity for gas compression at a given output and upstream and down </em><em>stream </em><em>pressures at the station.</em></p> Ye. I. Kryzhanivskyy, V. Ya. Grudz, V. Ya. Grudz (jun.), R. B. Tereshchenko, R. M. Govdjak Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/476 Wed, 26 Jun 2019 00:00:00 +0300 INVESTIGATION OF GAS-DYNAMIC PROCESSES IN PIPELINE COMMUNICATIONS DURING THEIR TRENCHLESS RECONSTRUCTION WITH THE TECHNOLOGY "TRACTION PISTON" http://nge.nung.edu.ua/index.php/nge/article/view/467 <p><em>The technology of the trenchless reconstruction of pipeline communications "Traction Piston</em><em>", which consists in running a new polyethylene pipeline into a steel one worn by pigis described. At the same time, in order to maintain the necessary pressure in the cavity, the space between the new polyethylene pipeline and the worn steel one is sealed.</em></p> <p><em>A 3D modeling of the annulus and space behind the piston, where the complex turbulent flow of air flows, is carried out. </em><em>A CFD modeling of gas-dynamic processes in the annulus and space behind the piston while laying </em><em>a worn steel pipeline with a polyethylene pipeline in the ANSYS Fluent software system is performed. The mathematical model is based on the solution of the Navier-Stokes equations and the continuity of the flow closed by a two-parameter turbulence model of Launder-Sharma with the use of a wall function with corresponding initial and boundary conditions. A dynamic grid model was used to simulate the motion of the piston and the polyethylene pipeline. The type of adjustment of the dynamic grid parameters during the stroke of a new polyethylene pipeline into a defective steel</em><em> one – Layering was chosen.</em></p> <p><em>The simulation results were visualized in the postprocessor of the software complex by constructing flow lines, velocity vectors, pressure fields on the contours and in the longitudinal section of the annulus and space behind the piston. The exact values of velocity, pressure at different points between the annulus and space behind the piston were determined. The structure of the air flow in the cavity and interstitial space is studied. The places of slowdown and acceleration of air flow, falling and increase of pressure are found. The loss of pressure in the annular space is </em><em>determined.</em></p> K. A. Poliarush Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/467 Wed, 26 Jun 2019 00:00:00 +0300 MATHEMATICAL MODELING OF THE CHARACTERISTICS OF OIL PUMPS, TAKING INTO ACCOUNT THE VISCOSITY OF THE TRANSPORTED OIL http://nge.nung.edu.ua/index.php/nge/article/view/479 <p><em>For solving a range of assignments concerning design and operation of main oil pipelines it is necessary to possess appropriate mathematical models of centrifugal pump characteristics as the pumps appear to be the main equipment of pumping stations. Known analytical dependences describe only operating envelope of the pumps and thus can`t be applied for low flowrate regimes being inherent to the Ukrainian oil transmission system.</em> <em>In addition, these mathematical models do not take into account the effect of the viscosity of the transported oil on the pressure and energy characteristics of oil pumps. The work </em><em>features the </em><em>improved the method of mathematical modeling of the hydrodynamic characteristics of centrifugal pumps of main oil pipelines for the full range of working feeds, taking into account the effect of the viscosity of the pumped oil. It is also given a consideration to mathematical models of oil pumps characteristics, coefficients of which are found by the coordinates of two or three points of corresponding charts, and polynomial models, the coefficients of which are determined by the least squares method by a set of passport or experimental data. Adequate mathematical models for pressure characteristics and efficiency coefficient of oil pumps are proposed that are suitable for creation of computational algorithms for determining the throughput and energy efficiency of operation of main oil pipelines. It has been proved that for oil pumps that are operated under different combining schemes with significant reduction of theirs operation flowrate the advantage should be given to the mathematical models of the characteristics obtained by the method of least squares. In this case, polynomial models of the third degree provide the necessary accuracy of the calculations. The method of introducing a control unit for the influence of the transported oil viscosity on the characteristics of the pumps is proposed under determining the capability and energy efficiency of operation of main oil pipelines</em></p> M. D. Serediuk Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/479 Wed, 26 Jun 2019 00:00:00 +0300 FLOW CAPACITY OF MAIN OIL PIPELINES WITH PREDEFINED OIL PUMPING STATIONS LOCATION WITH PERIODICAL PARTIAL OIL DUMPING http://nge.nung.edu.ua/index.php/nge/article/view/485 <p><em>Transportation of oil via main pipelines often requires the need for a permanent or periodic dumping of some part of the flow for further shipment of crude oil to oil refineries or filling stations. The application of such technology leads to a change in the operating mode of oil pumping stations and the oil transportation system in general. In case of emergency, an analogue of dumping is an oil leak from the pipeline in a case of violation of its integrity. Resetting a part of the flow is accompanied by a change in a liquid flow ahead of and behind the discharge point, which inevitably leads to a redistribution of pressures at the inlet and outlet of transitional petroleum pumping stations. Increasing of pressure at the output of the stations may lead to the violation of the pipeline strength; reducing of input shoring may cause cavitation operating modes of the equipment. Therefore, the study of the impact of discharges on the parameters of the operation of oil transportation systems in order to ensure their reliable, safe and economically efficient functioning is a relevant point of this area. For this purpose, based on the proposed calculated algorithms implemented in the software, the authors conducted the research on the impact of periodic oil discharges on the redistribution of hydraulic flows, energy losses at the bends, pressure at the inlet and outlet of oil pumping stations, as well as the volume of trunk oil pipelines capacity. The approbation of the proposed elaboration is carried out by defining the operational parameters of processing in functioning of oil and transport system «Druzhba» at the Mozyr-Tukholsky pass, which runs throughout the territory of Ukraine. Based on the analysis of the obtained results it was established that, depending on the volume of a discharge, the location of the limiting area, which limits the entry capacity of the trunk pipeline in general, might be changed. At the same time, the bend, ahead of which the part of oil is discharged, is not always limiting. Increasing the volume of a discharge leads to growing capacity of the pipeline at the area ahead of the point of discharge in the case when the limiting pipeline bend is behind the discharge point. If such a bend is located on the pipeline ahead of the discharge point, the increasing discharge does not affect the capacity of the initial area of the pipeline.</em></p> Y. V. Yakymiv, O. M. Bortniak Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/485 Wed, 26 Jun 2019 00:00:00 +0300 ANALYSIS OF THE CAUSES OF THE SUDDEN DESTRUCTION OF THREE-CONE DRILL BITS WITH BUILT-IN ROCK-DESTRUCTION EQUIPMENT http://nge.nung.edu.ua/index.php/nge/article/view/478 <p><em>Tricone</em><em> drill</em><em> bits with plug-in</em><em> rock-</em><em>cutting equipment</em><em> are</em><em> intended</em><em> for</em><em> the</em><em> construction</em><em> of wells in</em><em> hard rocks. To</em><em> the</em><em> operational</em><em> performance</em><em> of</em><em> bits,</em><em> stringent</em><em> requirements</em><em> for</em><em> wear</em><em> resistance</em><em> and</em><em> crack</em><em> resistance</em><em> of</em><em> bit</em><em> steel, structural</em><em> strength</em><em> of</em><em> parts</em><em> of</em><em> bits, and</em><em> especially</em><em> cones, are</em><em> put forward.</em><em> The scientific work involves a comprehensive analysis of the causes of the sudden failure of the rock-cutting tool, research of all factors affecting the performance and durability, and the options for selecting materials and rolled products for the manufacture of roller cone bits are proposed. A general analysis of the destruction of the cutters of spent tricone drill bits, as well as metallographic studies of the heat of steel, have been carried out. The materials from which bits are made have been investigated for the content of chemical elements and the determination of the physicomechanical properties of these steels. It is established that the causes of sudden failures of bits through the brittle destruction of cones are the inconsistency of smelting steel requirements for strength, ductility and technological – quenching. It has been found that the average value of the percentage of chemical elements in the body of the tested cone does not go beyond the limits of tolerance. By analyzing the physicomechanical and technological indicators of the studied steel smelting, increased values of strength and quenching have been established, and the ductility and impact toughness values have been reduced. The analysis of the chemical composition of steel melting did not reveal a significant dispersion of the percentage of chemical elements. Segregations and similar effects were not detected. It is established that such technical conditions allow too wide dispersion and optional value of non-metallic inclusions, and also do not regulate the presence of harmful impurities, which dramatically increase the quenching, hardness and other indicators that worsen the performance of cones. It is proposed to abandon the use of existing rolled stock and to develop and introduce a more reasonable regulatory document according to which rolled steel should be supplied for the manufacture of parts of tricone drilling bits.</em></p> R. S. Yakym, D. Yu. Petryna Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/478 Wed, 26 Jun 2019 00:00:00 +0300 ANALYSIS OF OPERATION OF INTERNAL COMBUSTION ENGINES WORKING ONE BIOGAS FROM THE LANDFILL WASTES http://nge.nung.edu.ua/index.php/nge/article/view/486 <p><em>The problem of the effective use of traditional energy sources and the search for alternative resources is currently urgent. Today, in Ukraine, the low-calorie gas potential, which in large quantities is formed in landfills from solid household wastes, in particular biogas, is almost not used. The number of existing domestic installations for the disposal of this gas is insignificant. Today, this valuable resource in quantities of up to 1 billion cubic meters per year is emitted into the atmosphere contaminating it, or burned in flares. Rarely biogas is used in automotive internal combustion engines. However, replacing gasoline with biogas results in reduction in engine power and an increase in fuel consumption. Knowing the component composition of biogas, one can calculate the heat of its combustion and the heat of combustion of gas-air mixtures.</em></p> <p><em>According to the results of analytical studies, the graphic dependences of the change in effective power, torque and the effective specific biogas flow rate on engine revolutions were constructed and a comparison of these values with those of a petrol engine was performed. Dependencies show that the use of biogas as a fuel for the ICE leads to a significant reduction of the above parameters: in particular, the effective power decreases to 20%, torque to 22%, and the specific effective fuel consumption increases by 170%. However, due to the low cost of this type of automobile fuel and the considerable resource base for its obtaining in Ukraine, one can conclude - the use of biogas from landfills should be expanded and this is promising, in terms of energy independence of both separate economic entities and the state as a whole.</em></p> T. V. Dykun, L. I. Haieva, F. V. Kozak, Ya. M. Demianchuk Copyright (c) 2019 Oil and Gas Power Engineering http://nge.nung.edu.ua/index.php/nge/article/view/486 Wed, 26 Jun 2019 00:00:00 +0300