Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv <p>The subjects of the “<strong>Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas</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">Material mechanics;</li> <li class="show">Mechanical engineering;</li> <li class="show">Information programs and computer-integrated technologies.</li> </ul> en-US <p>Авторські права....</p> nvjournal@nung.edu.ua (В.В. Михайлюк) vizd@nung.edu.ua (vizd) Tue, 07 Sep 2021 16:24:02 +0300 OJS 3.2.1.2 http://blogs.law.harvard.edu/tech/rss 60 Analysis and improvement of the design of uninterrupted connection of pump rods https://nv.nung.edu.ua/index.php/nv/article/view/753 <p><em>Based on the field data, numerous failures of the downhole equipment of sucker rod pumping units occur, especially of the sucker rod strings. They are subject to corrosion, wear and alternating loads. The stress-strain state of the threaded connection elements is determined by the nature of the distribution of loads along the threads, which is uneven and depends on many factors. Despite this, the development of new designs of sucker rod connections and measures to improve the efficiency of operation and their research is an urgent task. In addition to the threaded connections of the sucker rods, there were a number of threadless designs that were not used in the fields, but they passed certain tests. The article presents these connection designs and discusses their advantages and disadvantages in comparison with standard threaded connections. Simulation modeling of a standard connection of sucker rods made it possible to investigate its stress-strain state and identify hazardous areas (stress concentrators). The stress-strain state of the threaded connection of the sucker rods has been investigated, the design of this connection has been improved and it has been established that, in comparison with the standard threaded connection of the sucker rods, the investigated has certain advantages. It was found that with an increase in the number of protrusions and depressions in a threaded joint, stresses decrease, which are concentrated in dangerous sections and along the contact planes. Convex contact planes also reduce stress, especially at the joint surface. Research has shown that the stresses generated in a threadless sucker rod joint are less than the stresses generated in a standard sucker rod and sleeve joint. Although the difference between these stresses is insignificant, attention should be paid to changing the geometric parameters of the threadless connection of the sucker rods, thereby reducing the maximum stresses.</em></p> О. Ya. Faflei, R. О. Deynega, G. Ya. Protsiuk, V. V. Mykhailiuk, V. О. Melnyk, Ye. М. Faidash Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/753 Tue, 29 Jun 2021 00:00:00 +0300 Influence of spatial welding on the accuracy of working dimensions of drilling chisels of cutting-erasing type https://nv.nung.edu.ua/index.php/nv/article/view/751 <p><em>The article considers the problem of PDC drill bit quality provided during manufacturing. Schemes of welded joint making are theoretically substantiated based on theoretical research, computer modelling and experimental tests for L-shaped details like PDC drill bit blades. The recommendations to provide welded joints for L-shaped details are developed. Based on the elastic-plastic analysis, means to reduce thermal longitudinal and transverse internal deformations caused by a heat source moving along the weld are theoretically substantiated. Simulation models have been developed to assess the influence of welding thermal action and residual deformations on accuracy of drill bit external diameter for different schemes of welding. Based on the developed models, it is shown that the thermal welding deformations of spatial curved welds are significant, and relate mainly to the blades rather than the body (i.e. less massive parts); there are bends, turns and skews of the blades. Finite-element simulation of the bit body – welded blades stress-strain state was performed sequentially in the environment ANSYS (academic license) – Transient Thermal (determination of heat load) and Static Structural (determination of deformations and stresses). It is established that the smallest deformations of the blade are observed for the welding scheme, which envisages making the weld from the point of cylindrical and ellipse surface pairing. The results obtained by simulations were confirmed by experimental data and this made possible substitution for a rational scheme of drill bit body – blade based on the method of reverse deformation, to ensure the accuracy of the product as a whole. Recommendations for weld joint making for spatial curved welds of complex products with requirements to their accuracy allow increasing the accuracy of the technology by minimizing the thermal load and residual thermal deformation of the joints.</em></p> L. Ya. Ropiak, V. S. Vytvytskyi, Т. О. Pryhorovska, О. V. Pryhorovskyi Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/751 Tue, 07 Sep 2021 00:00:00 +0300 On the possibility of using simulation modeling for research and design of universal preventer seals https://nv.nung.edu.ua/index.php/nv/article/view/754 <p><em>Well control in the process of their construction is one of the important factors in ensuring the safety of the technological process. Blowout preventer equipment, which includes annular preventers, is used to control the wells. This applies to oil and gas wells, and wells that provide degassing of coal seams to reduce their gas-dynamic activity. Technological processes of safe work require the expansion of the functionality of the sealing unit of the annular preventer while ensuring its high performance. One of the determining factors to ensure the required durability of seals in different modes of operation is the study of their stress-strain state. In this paper, the possibility of using simulation three-dimensional modeling in the study of the influence of the geometry of the reinforcing metal inserts of the seal on its stress-strain state as a whole is considered. To this end, a method for determining and determining the material constants for the implementation of the Mooney-Rivlin model, which describes the behavior of low-compressibility rubber in software products based on the finite element method. It is established that two material constants can be used for simulation modeling of an annular preventer seal with deformations not exceeding 150%. More constants must be determined to model a sealant with larger deformations (up to 600%). The reliability of the obtained results of the model studies is characterized by a total error of experimental and theoretical studies of up to 5%. Thus, the prerequisites are created and the possibility of using simulation modeling in the study and design of elements of universal preventers with high performance is confirmed.</em></p> V. V. Mykhailiuk, І. І. Chudyk, Yu. R. Mosora Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/754 Tue, 29 Jun 2021 00:00:00 +0300 Features of the study of threaded joints using the finite element method https://nv.nung.edu.ua/index.php/nv/article/view/752 <p><em>A significant number of computer programs exist today for various engineering calculations, research and development of equipment elements. The SolidWorks software has become widespread for such work, which allows you to minimize time, facilitate the performance of the necessary work, as well as analyze the strength, stiffness, stability and endurance of products of a wide range of complexity and purpose. The program uses the finite element method, which has both a number of advantages and certain disadvantages.</em></p> <p><em>To investigate the possibilities of such a program, a model of a threaded connection of sucker rods has been built. Simulation of make-up torque for threaded connections remains problematic when modeling in SolidWorks Simulation. There are several ways to simulate the make-up moment during the study of the stress-strain state of threaded connections. To solve problems in an axisymmetric setting, the optimal method is to overlap the ends of the nipple and coupling by the required amount. The use of an axisymmetric model in the process of simulation does not impair the results obtained in comparison with 3D models. But it speeds up the calculation process, allows you to build a fine mesh of finite elements and get more accurate results.</em></p> <p><em>The paper presents an algorithm for calculating the tension of the threaded connections of sucker rods, which can be applied to threaded connections of drill string elements with some adjustments. The only difference will be in the formula for determining the make-up moment, from which the value of the pre-tightening force and the areas of dangerous sections are derived. Also, in the work, a simulation study was carried out using the selected method using the example of a threaded connection of sucker rods with a diameter of 19 mm. A diagram of displacements and distribution of equivalent stresses in a threaded connection was obtained and the possibility of determining specific parameters at certain points of the model under study was shown with subsequent automated construction of their graphical dependencies.</em></p> О. Ya. Faflei, V. V. Mykhailiuk, R. V. Rachkevych, R. О. Deynega, А. І. Riznychuk, R. S. Kravchuk Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/752 Tue, 07 Sep 2021 00:00:00 +0300 Technology of interactive interaction of the computerized control operator of a multiparameter object based on an image-cluster model https://nv.nung.edu.ua/index.php/nv/article/view/755 <p><em>The work is devoted to the synthesis of the structure of the image-cluster model of interactive monitoring of the states of multi-parameter control objects based on the computer-aided design (CAD) algorithm for parallel processing of statistical data and correlation characteristics of technological objects. The theoretical foundations of the methodology for constructing an image-cluster model of multiparameter objects based on the proposed functional for assessing the state of the monitoring object are presented. Based on the analysis of the structure and declared functions of modern integrated computerized systems for universal use and problem-oriented monitoring of drilling processes, the necessity of developing the theory, improving the functions and methods of increasing the efficiency of operators' work in the interaction "operator –</em><em> monitoring system" is shown. The main interface and management functions of the operators of the technological process monitoring subsystem have been determined. The main functional limitations of the existing monitoring systems are formulated, which do not ensure the prompt identification and editing of operators for complex pre-emergency and emergency situations at the facilities. The functions of the operator's interactive interaction in the information environment of the computerized system are systematized. The necessity of developing the corresponding applied algorithmic and software software by performing high-performance calculations and generating image-cluster models and researching in industrial conditions the effectiveness of sequential models of protecting control objects from the occurrence of abnormal, pre-emergency, forecasting emergency and catastrophic situations at oil and gas facilities, including monitoring of drilling processes. The structure of a parallelized algorithm for constructing and displaying on a monitor an image-cluster model model of an object based on the developed CAD software is presented.</em></p> H. Ya. Protsiuk, V. R. Protsiuk, Ya. М. Nykolaichuk Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/755 Tue, 29 Jun 2021 00:00:00 +0300 Output parameters at development and production stage of a product in its life cycle https://nv.nung.edu.ua/index.php/nv/article/view/747 <p><em>The priority of research into modern information systems for controlling technological processes of product manufacturing and their introduction into the practice of machine-building enterprises is established. Described the object-oriented and functionally-oriented principles of designing technological processes in the manufacture of machine parts and the area of their effective use. Algorithms of initial product parameters formation when implementing object-oriented and function-oriented principles of technological processes design are analyzed. A generalized algorithm of a CAF-system functioning in the structure of an integrated design-engineering preproduction is presented. The conditions of shaping product parameters taking into account the influence of an integrated subsystem of design-engineering preparation of machine-building production and technological subsystems: machine, fixture, tool, workpiece are analyzed. The main provisions of the system approach to the study of the formation of the output parameters of products at the stage of their creation in life cycles during the implementation of function-oriented design principles are formulated. The conditions for the realization of physical processes from the position of the synergetic approach in the study of technical systems are analyzed. A mathematical model for predicting the probability of forming a workpiece blank without defects at the stage of its creation during the implementation of the technological process of product manufacturing was developed. Numerous solutions of the mathematical model are given, which determine the degree of influence of technological subsystems on ensuring output parameters of the product. Using a synergetic approach, the process of forming the initial parameters of the product as a result of interaction between the integrated subsystem of design-engineering preparation of engineering production and technological subsystems: machine, device, tool, workpiece with the provision of quality control parameters of the product using the CAF subsystem and a subsystem of implementation of control operations. Further research will concern the development of algorithms for determining the solutions of mathematical models when designing technological processes for the manufacture of machine parts using a function-oriented design principle while ensuring the regulated quality parameters of their executive surfaces.</em></p> Ya. М. Kusyi, V. V. Stupnytskyy, Ya. М. Lytvyniak, S. М. Mentynskyi, V. H. Panchuk Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/747 Tue, 29 Jun 2021 00:00:00 +0300 Механізми та наслідки обводнення мастильних олив у трансмісіях штангових свердловинних насосних установок https://nv.nung.edu.ua/index.php/nv/article/view/750 <p><em>In ensuring the trouble-free and long-term operation of artificial lift facilities, an important role is played by the condition of lubricants and, in particular, oils. The operating conditions of sucker rod pumping units have their own characteristics - the equipment is operated daily and around the clock, its operation is characterized by temperature drops, humidity, significant and uneven loads, vibrations, high contact pressures, etc. there is a gradual accumulation of water in various forms: dissolved, in the form of an emulsion or in a free state. The presence of water is undoubtedly destructive; it naturally intensifies the aging process of lubricants and accelerates the wear of parts in friction pairs. On the basis of scientific papers, the mechanisms, patterns and consequences of the harmful effects of flooding of lubricating oils are analyzed, taking into account the specifics of the operating conditions of oilfield equipment. The regularities of changes in the state of the properties of oils, depending on the form of the presence of water in the lubricating medium: free, emulsified and dissolved, are separately considered and analyzed. The ways and mechanisms of flooding have been investigated and analyzed, which are conditionally divided into three groups: absorption of atmospheric moisture by oil components, condensation of atmospheric moisture on the inner surfaces of the gearbox and the mirror of the lubricant bath, and direct ingress of water into the gearbox due to technical imperfections and equipment defects. Particular attention is paid to the regularities of atmospheric moisture condensation, as the main path of flooding and the factors affecting the intensity of this process in the industrial operating conditions of the gearboxes of sucker rod pumping units. The main directions of the fight against flooding of both design and technical and organizational nature have been formulated.</em></p> І. І. Shostakivskyi, V. R. Kharun Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/750 Tue, 07 Sep 2021 00:00:00 +0300 The research for the influence of properties of punch material on performance and productivity of cold sheet stamping https://nv.nung.edu.ua/index.php/nv/article/view/749 <p><em>After analyzing the main trends, it was found that sheet metal stamping is widely used in many fields of mechanical engineering. And the destruction of the working parts of the stamp in serial or mass production significantly affects productivity. In the course of work punches are exposed to high power loading therefore they are made of wear-resistant steel with the increased durability and hardenability. But like any tool with a long load, the punch and die are almost always accompanied by the combined action of two destructive processes - wear and fatigue, and the service life is limited by the number of strokes. The influence of the properties of the punch material by the finite element method for punching a hole made of sheet material on the stamps of cold sheet stamping is investigated in the work. The study was performed fifteen times for five different materials. The punch was subjected to a load from changes in sheet thickness where the maximum stresses of possible displacements as well as deformations were monitored. Having the character of influence on stability of the tool. During long-term operation of the stamp there is a large concentration of stresses in the weakest zone of the punch, which causes the lower part to wrinkle, which creates forces acting on the axis of the punch. Such deformations usually lead to a reduction on one side of the gap between the punch and the die and encourage an increase in friction forces. The gaps that depend on the mechanical properties and thickness of the material, as well as the mode of operation of the press - the number of double strokes of the slider per minute. The dependence of the influence of the material of the punch and the gap between the punch and the matrix on the quality of parts and the performance of the stamp is considered. The maximum possible number of punches was determined, the calculation and analytical analysis of the tool stability from material change to sheet thickness was performed. As well as stability depending on the hardness of the tool material. The obtained research results were analyzed, substantiated and described in this article, as well as recommended to use the influence of the properties of the material of the punch in the design of dies.</em></p> В. Г. Панчук, Р. Т. Карпик, Назар Костюк Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/749 Tue, 07 Sep 2021 00:00:00 +0300 Hardness of low-carbon steels during shot blasting https://nv.nung.edu.ua/index.php/nv/article/view/745 <p><em>Low-carbon steels are widely used in mechanical engineering. The surface of products made from such steel is often shot blasted for the purpose of cleaning it, hardening the surface layer, forming roughness, etc. Rational technological modes and efficiency of shot blasting of the surface primarily depends on the dynamic hardness of the material being processed. Some researchers [3-6] offer empirical dependences for determining dynamic hardness with a functional dependence on certain mechanical properties of the material. However, the discrepancy between the calculation results behind these dependencies differ significantly. This indicates insufficient consideration of various factors. This article proposes a method for determining the dynamic hardness of low carbon steels during shot blasting, which takes into account both the factors of the loading mode and the properties of the material. The value of dynamic hardness is calculated by dividing the consumed kinetic energy E by the volume of the extruded hole. Therefore, the process of plastic deformation of the hole under the action of the kinetic energy of the attacking shot was considered. The energy losses of the attacking shot are indicated (for elastic and plastic deformation, for internal friction, as a result of which the metal heats up, for microcutting, external friction, splitting of the shot and dissipative losses). An analytical dependence acceptable for practical use is proposed, which takes into account the loading conditions. It is shown that the dynamic hardness of low-carbon steels during shot blasting is directly proportional to the square of the mass of the attacking shot, the attack speed, depends on the coefficient of recovery of the shot speed and on the amount of energy loss, and is inversely proportional to the square of the roughness parameter and the diameter of the sphere described around the shot. The coefficients also indirectly take into account the mechanical properties of the material. The calculated values ​​of the dynamic hardness of low-carbon steels are approximately 2…3 times lower than the static one. This is due to significant energy losses due to internal friction, which causes softening of elementary volumes of metal in the affected zone due to its heating. The actual value of the dynamic hardness of low-alloy steels during shot blasting, determined behind this technique, provides a reasonable choice of rational technological modes and the effectiveness of the shot blasting process from a given result.</em></p> <p> </p> А. М. Cherniavskyi, А. М. Buchynskyi, L. S. Shlapak, М. Ya. Buchynskyi Copyright (c) 2021 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas https://nv.nung.edu.ua/index.php/nv/article/view/745 Tue, 07 Sep 2021 00:00:00 +0300