JOURNAL OF HYDROCARBON POWER ENGINEERING <p>111</p> en-US <p>Copyright Notice</p> (Mykhailo Myslyuk) Mon, 28 Dec 2020 00:00:00 +0200 OJS 60 Polymeric materials based on epoxy oligomer DER-331 and hardeners of different physical and chemical nature for repairing of gas production equipment <p>The optimal content of PEPA and TETA hardeners and polymerization temperature during matrix formation on the basis of epoxy oligomer DER-331 were determined. The dynamics of dependence of hardener content on physical and mechanical properties of epoxy matrix was investigated. According to the results of the study, materials with the optimal content of hardener and temperature range of polymerization for the formation of a composition with high physical and mechanical properties and its further use for the repair of gas equipment are proposed. Developed polymeric materials containing the hardener TETA with a content of q = 8–10 weight parts per 100 weight parts of epoxy oligomer DER-331 are characterized by high physical and mechanical properties, in particular: the fracture stresses during the flexion are σfl = 80.0–95.1 MPa, the modulus of elasticity E = 2.8–2.9 GPa, impact strength W = 7.9–13.5 kJ/m2. The fracture structure of such composites is characterized by less deep branched chip lines with relatively uniform transitions, which makes it possible to state a slight stress state of the polymer, and hence its increased resistance to fracture.</p> O. O. Sapronov, V. V. Sotsenko, B. Antonio, S. O. Smetankin, K.Yu. Yurenin Copyright (c) 2021 Roman Bishchak Wed, 24 Feb 2021 00:00:00 +0200 The study of the influence of technological parameters of the impulse process on the formation of the weld metal and the microstructure of the heat-affected zone <p>With prolonged use of metal structures, the likelihood of their mechanical destruction increases. This is largely true of welded joints of pipelines. One of the promising ways to solve the issue of increasing their service life is the development of welding methods based on the use of pulse control of the energy parameters of the process. The pulsed welding mode allows for controlled heat input to the weld zone, control the melting mode of the electrode metal and the formation of the weld metal structure and the heat-affected zone (HAZ).</p> <p>Two types of metal transfer from the electrode to the weld pool were used in the work: with short circuits and without them, that is, welding was performed on a "long" arc. At a constant feed rate of the electrode wire, the welding mode was changed by changing the shape of the current-voltage characteristics of the power source.</p> <p>It is established that with increasing pulse-arc welding frequency, pulse-arc welding on the effect of influence on the HAZ metal approaches the process of welding by a stationary arc. The results of metallographic studies showed a slight decrease in the total width of the HAZ with an increase in frequency to 50 Hz. A similar trend is observed for the area of ​​coarse-grained in the HAZ. However comparedwith a stationary welding process, the width of this section decreases more significantly - by 25 ... 30%. Thus, in the case of welding pipe steels due to the application of technology with a pulsed process, there is a prospect of influencing the structure of the HAZ overheating aria at different frequencies and relatively small linear energies (6.0 ... 6.2 kJ / cm). From a practical point of view, this makes it possible to reduce the proportion of an unfavourable, non-plastic overheating zone in the HAZ, which is important for cases of repair of thinning of the pipe walls during the surfacing of defects in an existing pipeline in a mechanized manner.</p> S. Yu. Maksymov, A. A. Gavryliuk, L. S. Shlapak Copyright (c) 2021 Roman Bishchak Wed, 24 Feb 2021 00:00:00 +0200 Development of a polymer matrix with improved performance characteristics for protection of vehicle elements <p>The impact of Norsodyne O 12335 AL polyester resin content in epoxy oligomer ED-20 in terms of thermophysical properties has been investigated. The dynamics of the heat resistance index (according to Martens) of the composite with the increasing content of polyester resin in the epoxy oligomer to q = 120 weight parts and the optimal polyester binder content have been established. The change of thermal coefficient of linear expansion of epoxy-polyester composite in different temperature ranges and linear shrinkage from polyester resin content have been studied. It has been experimentally proved that with the introduction of Norsodyne O 12335 AL in the amount of q = 10–20 weight parts a composite material is formed, which is characterized by the minimum values of thermal coefficient of linear expansion in the following ranges: in the range of ΔТ = 303–323 К – α =1.6 10-5 К-1, in the range of ΔТ = 303–373 К – α =(2.0–2.5)10-5 К-1, in the range of ΔТ = 303–423 К – α =(3.8–3.9)10-5 К-1, in the range of ΔТ = 303–473 К – α =(8.8–8.9)10-5 К-1. At the same time indicators of linear shrinkage decrease in comparison with an epoxy matrix from Δl = 0.32 % to Δl = 0.13–0.14 %. It has been analyzed that the obtained values of thermal coefficient of linear expansion and linear shrinkage are correlated with the indicators of heat resistance (according to Martens) and with the previously studied values of physical and mechanical properties. The composition of the epoxy-polyester matrix has been established, which in the complex differs in the increased indicators of thermophysical properties. Based on the obtained results, an epoxy-polyester matrix has been developed, which is proposed to be used in the formation of protective coatings for parts of vehicles operating under the influence of variable and elevated temperatures.</p> M. V. Brailo, A. V. Buketov, S. V. Yakushchenko, A. V. Sapronova, O. S. Kobelnyk, I. T. Yarema, I. P. Fesenko Copyright (c) 2021 Roman Bishchak Wed, 24 Feb 2021 00:00:00 +0200 Determination of the rheological properties of drilling fluids from rotational viscometry data <p>The method of rotational viscometry data processing, which is based on the maximum likelihood function principle is considered. The method takes into account the informative content of experiments and is built on the strict solution of the Couette flow equation in a viscosimeter gap. The class of models is formed from rheologically stationary (including viscosity) models. A generalization of the model for processing the experimental plan data with the aim of building equations of the state of the rheological properties of variable factors is considered. A multicriterial interpretation of estimates of the rheological model and properties of liquids has been proposed. Illustrative examples of estimating rheological properties building of drilling fluids and their equations of state are given.</p> <p>&nbsp;</p> M. A. Myslyuk Copyright (c) 2021 Roman Bishchak Wed, 24 Feb 2021 00:00:00 +0200 Adaptation of the material balance of a gas deposit <p>The aim of the researching is to study the application of the material balance method with modern technologies to create a useful gas reservoir model with water influx.</p> <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The basic equations of material balance are analyzed taking into account the Mendeleev-Clapeyron law for gases. The analysis was performed taking into account the water influx component according to Fetkovich's equations. The paper highlights the problems of identifying the parameters of the material balance model as material balance model doesn’t include the geological structure of deposits. The calculation was done by material balance models created on Mathcad and VBA Excel.</p> <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The analysis and examples given in the article testify to the expediency of applying the method of material balance with VBA Excel to clarify gas reserves, including those with a water-driven or mixed mode of development and obtain an adequate model of the reservoir.</p> Yu. Zarubin, M. Hunda, P. Mamus Copyright (c) 2021 Petro Mamus, Микола Гунда, Юрій Зарубін Wed, 24 Feb 2021 00:00:00 +0200