Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas 2019-08-12T15:16:57+03:00 О.В. Паневник Open Journal Systems <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> <p>Material mechanics<br>Mechanical engineering<br>Information programs and computer-integrated technologies</p> RATIONALE FOR THE USE OF DOUBLE SHOULDER THREADED CONNECTIONS OF HOLLOW SUCKER RODS 2019-08-12T14:51:24+03:00 V. B. Kopey O. R. Onysko Yu. Yu. Zhyhuts <p><em>Frequent failures of standard threaded connections of hollow sucker rods are caused by their fatigue failures, self-loosening and leakages. This is mainly caused by such design flaws as unequal load on threads, insufficient shoulder area, stress concentration in the groove, low resistance to bending and torsion loads. Using iterative design, based on parametric geometric modeling and the finite element method, the feasibility of using double shoulder threaded connections for hollow sucker rods has been proved and their design has been improved. The improved connection has two shoulders, modified grooves with an elliptical profile, correction of the first turn of the nipple thread and optimal values of interferences. Due to this, the joint has greater tightness, strength at bending, torsion and compression, higher resistance to self-loosening, more equal load on the threads and greater fatigue strength compared to the standard one. The value of the fatigue safety factor in the area of the first turn of the nipple thread is increased by 13..</em><em>.14, in the area of the last turn of the coupling –</em> <em>by 2.6..</em><em>.4, in the area of the nipple groove by 0…0.4. The use of an elastic element on an additional shoulder allowed increasing the tolerance of the interference on it to 0.2 mm, making it unnecessary to control dimensions before screwing. Even after damage to the elastic part and loss of tension on an additional shoulder, the connection has greater strength than the standard one. In case of rod repairs, improved nipples can be easily implemented by welding them to the rod body. There is also the possibility of implementation of double shoulder cylindrical connections without modifying the standard nipple.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas IMPROVEMENT OF THE CONSTRUCTION AND COMPUTER DEVICE INVESTIGATION FOR THE PROCESSING OF BLOWOUT-PREVENTION HARDWARE EQUIPMENT 2019-08-12T14:57:32+03:00 L. O. Borushchak B. B. Vynnychuk <p><em>The research deals with the problem of blowout equipment</em><em> test for </em><em>tightness</em><em> before implementation.&nbsp; </em><em>The indicated equipment includes a stem, a system of pipelines with valves and a control system. The classic test procedure requires a mobile pumping installation that provides a pressure of 35 MPa.</em><em>The cost of such tests is rather </em><em>high</em><em>. For testing without a pump </em><em>unit</em><em>, a design of a device for increased tightness has been developed, includ</em><em>ing</em><em> a sealing unit of the mouth from the main column and a piston unit for creating high pressure in the test volume. </em><em>Generation of</em><em> a high pressure occurs by lifting the piston with a winch, mounted on the well</em><em>. D</em><em>isadvantages of the </em><em>previously </em><em>proposed design of the device are as follows. There is a</em> <em>considerable friction between the steel moving parts of the sealing unit. Mostly these are the pairs of </em><em>a plug</em><em> and a cup, and a </em><em>chuck</em><em> and a cone. Tightness </em><em>is provided by</em><em> rubber ring sleeves. </em><em>Exceedence of axial load on cones causes </em><em>destruction of </em><em>sealing ring</em><em>s. The authors of the article improved the design of the sealing unit in the following way</em><em>: a ball thrust bearing was seated between </em><em>the ends of the pressure plug and the bottom cup</em><em> and as a result </em><em>the sliding friction was replaced with </em><em>sliding</em><em> friction. On the outer surfaces of the opening cones in contact with </em><em>clamping bl</em><em>a</em><em>des</em><em>, it is proposed to paste a tissue antifriction material of type Naf</em><em>thl</em><em>en</em><em>e</em><em> or </em><em>equivalent</em><em>. The </em><em>friction </em><em>coefficient</em> <em>in such pairs is </em><em>next lower order than in steel to steel pairs.</em><em> The computer model of the device has been created in the Solid Works environment. The computer researches of the loading process of components of the sealing unit in the simulation program based on the finite element method were performed. As a result of the research, recommended values ​​of the axial force, required to create a screw pair of a stem and a plug for sufficient radial axial deformation of elastic cuffs with the simultaneous non-admission of their destruction were identified. Also, the </em><em>design</em><em> dimensions of the pressure cups of the device were optimized, namely, the mutual axial placement of the end face, which presses on the cone, and the tapered belt, compress</em><em>ing</em><em> the </em><em>sealing ring</em><em>. The determination of these parameters by an experiment is a long and expensive process.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas SOLUTION OF THE MAIN DIFFERENTIAL EQUATION OF DEFORMATIONS OF THE CASING IN A CURVED WELL 2019-08-12T14:59:37+03:00 I. I. Paliichuk <p><em>In a curvilinear well, the casing functions as a long continuous rod. It is installed on the supports-centralizers and replicates the complex profile of the well, as a result of which it receives large deformations. To describe them, a system of differential equilibrium equations of internal and external forces and moments was composed, which was supplemented to a closed form with a differential equation of curvature. It is non-uniform, because it takes into account the own distributed weight of the rod. Two ways are proposed to solve the problem: by the method of mathematical compression of the system equations into a complex inhomogeneous differential equation or by projecting the equilibrium equations of forces on the global (vertical-horizontal) and on the local (tangent-normal) coordinate systems. It is shown that the first integral of the system can also be found from the equilibrium equations of a portion of a curved rod of finite length. This integral has the form of a second-order inhomogeneous differential equation with variable coefficients and is the main equation that describes the deformation of a long elastic rod under the action of the longitudinal and transverse components of the forces of distributed weight. The main requirement of the technology is the installation of a pipes column on the centering supports, the purpose of which is to ensure the coaxiality of the pipes and the borehole walls and the creation between them a cement ring of the same thickness and strength. Accounting for this requirement allowed us to linearize the main equation. Its solution is the clue to the formulas of deflections, angular slopes, internal bending moments and transverse forces in the rod with the arbitrary arrangement of supports and boundary conditions in their intersections. The solution of the main differential equation of angular deformations of a long bar is found in the form of a linear combination of Airy and Scorer’s functions and in the form of three linearly independent polynomial series in the sum with a partial solution. The obtained formulas of flexure and power parameters allow us to calculate stress and strain in the pipes column during the process of casing the borehole of an arbitrary profile which increases the reliability and durability of the well.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas OPTIMAL DISTRIBUTION OF PARALLEL WORKING EQUIPMENT WITH REGARD TO ENVIRONMENTAL TAXES UNDER UNDERSTANDING CONDITIONS 2019-08-12T15:02:22+03:00 M. I. Ηorbiychuk O. T. Bila N. T. Lazoriv <p><em>For a case where the compressor station, where the parallel-supplied gas-pumping units operate, has an excess capacity, the problem of optimal choice of the number of aggregates by a certain criterion arises. The prevailing criterion has two components. The first component is the cost of the fuel gas consumed by the compressor station. The second component is the ecological tax charged for the release of nitrogen oxides into the environment. To calculate the second component, an empirical model is synthesized in the form of a polynomial of a given degree </em><em>which parameters and structure are determined using genetic algorithms. Such a model characterizes the dependence of the power of emissions of nitrogen oxides on the technological parameters that characterize the process of combustion of natural gas in the combustion chamber.</em></p> <p><em>In the generated problem of power emissions are calculated by the average values of technological parameters, which generates their fuzziness. Each parameter is characterized as the fuzzy value by a triangular membership function that is approximated by the Gaussian function.</em></p> <p><em>The formalized problem of choosing the optimal number of parallel operating units has in its composition the optimality criterion as fuzzy value and the limitations are determined by the given volume of pumped natural gas by the compressor station and the maximum allowable number of aggregates in each group of superchargers.</em></p> <p><em>The introduction of fuzz</em><em>iness generates a discrete nonlinear programming problem with linear constraints. For its solution, the method of boundaries and branches is used, on the basis of which </em><em>algorithms and software are developed. The software is tested on the developed example, where the data used to determine the operation of the compressor station is used.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas EXPRESS ESTIMATION OF THE ENERGY EFFICIENCY OF A CENTRIFUGAL PUMP WITHOUT EXPERIMENTAL DETERMINATION OF ITS EXPENSES 2019-08-12T15:04:27+03:00 V. S. Kostyshyn P. M. Nykolyn <p><em>Using a mathematical model, created on the basis of the electrohydraulic analogy method, a methodology for express estimation of the energy efficiency of a centrifugal pump was developed. The design load angle for analyzing the efficiency of operating modes of hydraulic machines is determined. The dependence of the power-driven engine shaft and the total efficiency of the centrifugal pump on its calculated load angle is established. The relationship between load angle and speed coefficient, which is a prototype of an electromagnetic load angle which characterizes the synchronous machine operating mode, is determined. </em><em>It is established the </em><em>dependence of the main pump </em><em>head on the calculated load angle and the differential pressure created by the centrifugal pump. The developed methodology makes it possible to avoid significant technical and financial difficulties, since flow meters have a high cost and certain requirements for installation, </em><em>while manometers are established by the standard requirements of the technological process. </em><em>The estimated value of the load angle of the centrifugal pump through its catalog parameters is determined. The operating characteristics for the main centrifugal pump of type НМ-7000-210 were calculated and built without experimental determination of its head. Such approach showed a good coincidence of calculated and experimental characteristics. Relative error of energy characteristics does not exceed ten percents.&nbsp; The proposed methodology can be used for express estimation of the efficiency of energy transformations of the whole electric drive pump unit. Express-analysis is a key to successful management of the energy economy through timely detection of inefficient modes of operation of electric-driven pump units and makes energy research cheaper.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas SIMULATION OF WEAR OF THE CHRISTMAS TREE CHOKE ELEMENTS 2019-08-12T15:07:01+03:00 Ya. T. Fedorovych M. M. Liakh V. V. Mykhailiuk R. O. Deineha B. I. Koval <p><em>The effectiveness of the use of machinery and equipment in the oil and gas industry is impossible without solving the problems associated with improving the wear resistance of their components and parts.</em></p> <p><em>One of the types of equipment that is subject to intensive wear is the elements of the gushing fittings (valves, chokes, etc.). During operation, the throttle locking elements (tip and nozzle) are subject to the destructive influence of the working environment, as a result of which hydro and gas-dynamic wear of the tip and nozzle occurs. As a result, it becomes impossible to control the flow of a well.</em></p> <p><em>The aim of the work is to use simulation modeling to study the wear process of the elements of the choke of the Christmas tree fittings to determine the areas that are the most worn, taking into account the size of abrasive particles in the gas stream.</em></p> <p><em>According to the results of simulation, it was found that the size and place of maximum wear of the throttle elements is different, depending on the size of the grains of sand. The amount of wear on the throttle tip is 15 mm/year, and most of all, it is not the tip that wears, but the nozzle (46 mm / year). It was also found that the amount of wear of the surfaces located in front of the nozzle, compared with the wear of the tip and the nozzle, is much less, and is 3 mm/year.</em></p> <p><em>Based on the above simulation algorithm and the obtained results, the model of an adjustable choke can later serve as a basis for its subsequent research, namely: optimizing the tip cone to reduce the amount of wear of the tip itself; studies of the effect of speed and pressure drop on the amount of wear of the throttle elements; design optimization.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 IMPROVEMENT OF ROD STRING DRIVE ROTATOR 2019-08-12T15:14:53+03:00 B. V. Kopey N. D. Bilyk <p><em>At present, there is not enough literature on the study of effective methods of the pump rod cleaning from asphalt-resinous and paraffinic substances and salts using the rod string rotator. At present, no rotators have been developed that significantly reduce the wear of the sucker rod body, or can be applied to polymer composite rods.</em></p> <p><em>The development of an effective rod rotor, ensuring continuous rotation of the rod string for cleaning of paraffin deposits. The choice of this method against APSD in the conditions of preserving the quality of products and implementation of normative and economic indicators in modern conditions is an important and topical issue.</em></p> <p><em>The design of the rod string rotator is developed, ensuring continuous rotation of the rod string from an independent actuator. This rotator design modernization makes it possible to reduce the amount of wearable parts, ensures independence of rotation from the progress of the rocking machine, which makes it possible to rotate the column of the rod at moments when the walking beam is at the top or bottom point, the rotation is carried out smoothly and without jerks, because with a mechanical drive slight jerks (when the rod is in contact with the tubing)&nbsp; is possible, the ease of replacing worn parts, inspection and replacement of the drive&nbsp; could be implemented.</em></p> <p><em>Using SolidWorks, a finite-element analysis was performed; a body and a cover are connected by means of transverse bolts with a torque, which creates a pulling force equal to 120 kN. From the data obtained, it can be seen that in attachment points of the cover to the body of the rotary screw with the help of bolts, there are slight tensions that are permissible for these materials.</em></p> <p><em>An assessment of the rod string weight on the rotating body was performed. It has been established that the deformations that occur in the attachment points of the cover to the base are within the tolerance.</em></p> <p><em>Thus, these improvements provide a continuous operation of the rotator to reduce paraffin deposition in the hole and reduce the wear of the rod and tubing. A finite-element analysis of the rotator is performed, which testifies to its efficiency at application of operational loads.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas MODELING OF IMPACT OF CENTRIFUGAL REINFORCEMENT MODES ON WEAR OF CUTTER TEETH OF DRILL BITS 2019-08-12T15:16:57+03:00 V. V. Kustov I. O. Shulliar V. M. Hrabovetskyi <p><em>A study was performed to improve the performance of drill bits. It is noted the main work item are cones, equipped with serrated arms, made in the form of solid or false teeth. It is noted reinforcement of cutters during destruction of rocks is subjected to intensive wear under the action of high loads at the bottom, significant temperature differences, in the presence of abrasive particles, changes in the rock hardness. To reduce the impact of these factors on the wear of rock-destruction weapons, comprehensive design and technological measures are proposed to create a rock-destructive tool and, in particular, its reinforcement. The efficiency criterion of such events is proposed to choose resistance of rock-cutting elements to various types of wear. For implementation of the proposed approach to creating effective reinforcement, a critical analysis of the design of the cutter teeth of drill bits equipped with teeth of various designs and technologies for their manufacture was performed, and rolling cutters with plug-in teeth made by centrifugal reinforcement were selected as the object of research as the most optimal. The design of such teeth, implemented by a centrifugal casting process, provides for location of the rock-breaking hard alloy in the tooth head. The tooth root, pressed into the cutter housing, is made of steel. A mathematical model of the process of centrifugal reinforcement of cutter teeth of drill bits was developed to study the impact of process conditions on their resistance to impact-abrasive wear. As independent variables, otherwise the factors determining the technological process modes of centrifugal reinforcement were selected X<sub>1</sub>, X<sub>2</sub>, X<sub>3</sub>, X<sub>4</sub>, their main level and intervals of variation, the upper and lower levels were established. A full factor experiment 2<sup>4</sup> was used in the research. An experimental plan was drawn up. In accordance with the chosen plan, 16 active experiments were performed; each experiment was repeated three times. Then, a mathematical model and its describing regression equation were developed. The impact degree of process factors on the value of shock-abrasive wear of teeth and their optimum values were determined.</em></p> 2019-06-26T00:00:00+03:00 Copyright (c) 2019 Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas