https://ogpe.nung.edu.ua/index.php/jhpe/issue/feedJOURNAL OF HYDROCARBON POWER ENGINEERING2023-11-14T17:20:54+02:00Mykhailo Myslyukmmyslyuk@ukr.netOpen Journal Systems<p>111</p>https://ogpe.nung.edu.ua/index.php/jhpe/article/view/200To the assessment of thermal stability of biopolymer systems2023-11-14T17:00:21+02:00М. А. Myslyuk, N. R. Zholobbishchakr@gmail.com<p>To diagnose thermal stability based on rotational viscometry data, an integral index for assessing the rheological properties of drilling fluids has been proposed. It is independent of their rheological model under thermobaric conditions of the well. According to the laboratory research of xanthan gum-based biopolymer systems, the possibility of assessing thermal stability in regard to the dependence of the integral index on temperature has been shown. The accuracy of thermal stability assessment has been confirmed by laboratory studies of the Biocar-TF biopolymer system at temperatures up to 170 ℃.</p>2023-06-26T00:00:00+03:00Copyright (c) 2023 Roman Bishchak (Менеджер журналу)https://ogpe.nung.edu.ua/index.php/jhpe/article/view/201To the issue of modeling the pressure distribution in a gas-bearing formation2023-11-14T17:12:29+02:00М. V. Lubkov, K. О. Mosiichukbishchakr@gmail.com<p>Based on the non-stationary Leibenzon piezoconductivity problem, there is considered the use of the finite-element difference method for estimating the pressure distribution in a gas-bearing formation. Based on the modeling results for a flat design scheme, it has been established that the process of gas-bearing formation depletion is mainly determined by the configuration of the location of production and injection wells, their capacities and filtration parameters. It has been shown that deconcentration of the system of production and injection wells is important for reducing reservoir depletion over time. This procedure is especially relevant for low-permeability formations. As the formation's permeability increases, the approach of the gas phase to production wells increases and the critical zone of depletion decreases. On the other hand, the increased permeability of a gas-bearing layer, during its operation without proper support, quickly leads to its exhaustion. In general, the process of depletion of a separate active section of a gas-bearing layer depends nonlinearly on its permeability. It has been shown that it is advisable to carry out increased production of raw materials at the initial stages of exploitation of a gas-bearing layer. As the formation is depleted, it is necessary to gradually reduce the production, which will lead to the prolongation of the exploitation of the formation. At the same time, it is important to maintain a technically justified value of the permeability of the working area of the formation.</p>2023-06-26T00:00:00+03:00Copyright (c) 2023 Roman Bishchak (Менеджер журналу)https://ogpe.nung.edu.ua/index.php/jhpe/article/view/202Influence of electrolytic hydrogenation on stress-corrosion cracking of X70 steel and pipes of long-term exploited main gas pipeline2023-11-14T17:20:54+02:00L. I. Nyrkova, A. V. Klymenko, L. V. Goncharenko, S. O. Osadchuk, S. Yu. Kovalenko, Yu. O. Kharchenko, V. V. Lavrenyukbishchakr@gmail.com<p>Cathodic polarization, which is used in the complex anti-corrosion protection of main gas pipelines to reduce the corrosion rate to a technically acceptable level, causes the decomposition of the soil electrolyte with the recovery of hydrogen, and its penetration into the steel under the action of tensile stresses contributes to the change in the mechanical properties of the pipes and resistance to stress-corrosion cracking. Comprehensive studies were conducted, and the effect of electrolytic hydrogen penetration on stress-corrosion cracking of X70 steel specimens made from a steel sheet and pipe of a long-term main gas pipeline in a model soil electrolyte NS4 under cathodic polarization in the range of potentials from -0.75 to -1.05 V was determined. The following methods were used in the work: slow strain rate tests, potentiometry, voltammetry, electrolytic hydrogenation, the method of scanning electron microscopy, and optical microscopy. It was established that for both types of specimens, the concentration of hydrogen penetrating into the steel during cathodic polarization increases non-monotonically, with a potential shift from -0.75 to -1.05 V. It is noted that the hydrogenation of specimens of steel under investigation begins at a lower protective potential than steel sheet specimens: -0.95 and -1.05 V, respectively. The concentration of hydrogen diffusing into steel for specimens from a sheet changes in the range 0 0 0.057 mol/m3, for specimens from an operated pipe – 0 0.019 0.024 mol/m3. As a result of the course of the hydrogen diffusion process, there is an increase in the susceptibility to stress-corrosion cracking of specimens from the operated pipe compared to specimens from sheet steel. The coefficient of susceptibility to stress-corrosion cracking KS for the steel sheet changes less intensively than for the specimens from the operated pipe: 1.06 1.06 1.18 and 1.25 1.35 1.53, respectively. Therefore, it was established that specimens made from long-term operating under complex anti-corrosion protection of the main gas pipeline have an increased susceptibility to electrolytic hydrogenation compared to specimens made of steel sheet, and as a result, an increased susceptibility to stress-corrosion cracking.</p>2023-06-26T00:00:00+03:00Copyright (c) 2023 L. I. Nyrkova, A. V. Klymenko, L. V. Goncharenko, S. O. Osadchuk, S. Yu. Kovalenko, Yu. O. Kharchenko, V. V. Lavrenyuk