Ivano-Frankivsk National Technical University oil and gas
RESEARCH, TEACHING, or OTHER INTERESTS
Energy, Engineering, Geotechnical Engineering and Engineering Geology, Energy Engineering and Power Technology
16
Scopus Publications
Scopus Publications
IMPROVING THE RELIABILITY OF OIL AND GAS WELL CEMENTING WITH THE APPLYING OF COMPOSITE PLUGGING SYSTEMS Ye. M. Stavychnyi, Ya. M. Femiak, O. Yu. Vytyaz, B. A. Tershak, and Socar Proceedings, 2025 Hydrocarbon production at fields with hard-to-recover reserves in complex mining and geological conditions requires solving complex reinforcement problems, the key one being ensuring high-quality delineation of productive horizons. The aim of the work is to evaluate and test the DRCT (Commercial name of plugging material) composite plugging material, which has improved performance characteristics for reliable well support and effective formation isolation, taking into account the quality of the cement stone. The influence of drilling fluid impurities on the structure of the cement stone was studied. It was found that their presence causes defects in the microstructure and insulation screen, which was confirmed by Radial Bond Tool (RBT) measurements in test wells.Testing was carried out on cementing slurries based on DRCT and Portland cement PCT I-100, prepared with fresh water containing 20% sodium chloride. The results of the studies showed the superiority of DRCT in terms of rheological properties, strength and brittleness of cement stone. Quantitative elemental analysis and X-ray phase analysis (XPA) of DRCT cement stone were performed. The structural formation features and strength characteristics were studied over eight years of operation in aggressive environments. The material proved to be highly resistant to degradation and maintained its strength in difficult conditions.Examples of recipe development and successful testing of DRCT material in wells confirmed its technological feasibility and effectiveness in complex reinforcement. Keywords: well; cementing; plugging mud; cement stone; strength of cement stone.
Specific features and prospects of well recovery by sidetracking based on the example of the stynava field Yevhen Stavychnyi, Stanislav Piatkivskyi, Andrii Vytiaz, Vasyl Femiak, Mykhailo Kovbasiuk, et al. Nafta Gaz, 2025 "The article provides a brief overview of the recovery of well No. 47 of the Stynava field by horizontal sidetrack drilling. Based on the analysis of the works, it is established that successful implementation of sidetracking projects with a complex profile can only be achieved through clear interaction of all involved contractors, based on the experience, results, and analysis of carried works, in close cooperation with specialists in the research industry, to implement leading technical and technological solutions. It presents the results of a detailed analysis of geophysical surveys and correlates the geological structure of the field with neighboring wells, which allowed us to design the optimal architecture and spatial placement of the sidetrack. The main technological stages of work on sidetracking and the technical difficulties that occurred are briefly described. The reasons for their occurrence and ways to overcome them are analyzed. The influence of a wide range of loads experienced by a drill string during operation in a directional section is considered, taking into account its geometric characteristics limited relative to the diameter of the sidetrack. The operability of the drill string before the onset of the limit state is calculated and the peak criteria beyond which emergency situations can potentially occur are determined. The influence of the applied drilling mud on the reservoir properties of the productive horizon of the Vygoda formation of the Eocene sediments of the Folded Carpathians (impact evaluation on the core permeability recovery factor) is analyzed. The structural, rheological, tribotechnical, inhibitory, and filtration properties of the drilling mud are presented, which ensure the stability of the near-borehole rock mass and accident-free deepening of the well sidetrack. On the basis of system analysis and calculations, the risks that arise during the lowering of the filter-liner in the complex spatial architecture sidetrack with a nonlinear indicator of the intensity of the zenith angle change are identified. On the basis of the calculations, generalized conclusions are drawn and ways to solve problematic issues regarding the possibility of successful descent of the liner to the bottom hole are presented. A graphical interpretation of the study of the plugging fluid and its formulation are presented. The necessity of using extensive stabilized plugging materials and specialized buffer fluids is established. The main practical criteria of the applied buffer systems are described. The example of the implementation of the project of the sidetracking in well No. 47 of the Stynava field and the initial oil production rate obtained confirms the need to carry out work on the well recovery by drilling a sidetrack in the late stage of exploitation of Ukrainian fields to increase hydrocarbon production.
FEATURES OF TECHNOLOGICAL FACTORS OF WELL CONSTRUCTION BASED ON THE EXAMPLE OF OIL AND GAS FIELDS Ye. M Stavychnyi, Ye. A Koroviaka, A. O Ihnatov, M. O Tokareva, V. V Yavorska, et al. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2025 Purpose. Comprehensive study of geological and technological factors of drilling, flushing during drilling, stabilization of wellbore walls, as well as opening of productive horizons in difficult mining and technical development conditions at different stages of hydrocarbon deposits. Methodology. When carrying out the research, basic methods of mathematical and physical modeling, bench experimentation, as well as methods for processing the results of laboratory and industrial research in the EXCEL and MATNCAD environment were used. Measurements of the parameters of compositions of special process liquids were carried out using appropriate control and measuring equipment and materials. Findings. Laboratory and production data on the analysis of well bottom deepening indicators and the use of special agents in wells ‒ flushing fluids, cementing systems in tandem with buffer fluids are proposed for consideration. These agents make it possible to rationalize the drilling process, as well as prevent the active development of deterioration in the filtration properties of reservoir rocks and create a reliable transport channel for hydrocarbons. Originality. Based on the study of the results of research into well construction processes, the following important circumstance has been proven. The solution to the problem of improving the quality of field development, in this case hydrocarbon fields, lies in the use of integrated approaches to the organization of downhole circulation processes of special technological fluids. Practical value. The obtained comprehensive results of laboratory and industrial research can be taken as the basis for creating modern methods for designing processes for deepening the face, as well as flushing when drilling and casing wells, the construction of which is carried out in sedimentary rocks.
DEVELOPMENT OF PROMISING TECHNOLOGICAL SOLUTIONS IN THE CONSTRUCTION WELLS A. O Ihnatov, О. О Aziukovskyi, Y. M Stavychnyi, S. A Rybachuk, I. K Askerov, et al. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2025 Purpose. Setting the parameters of drilling, flushing and cementing cycles of wells constructed in sedimentary rocks that are subject to integrity violations, absorption of drilling fluid and stuck drill pipes, as well as the development, based on these parameters, of effective methods for eliminating well complications. Methodology. The geological structure of the deposits was studied taking into account geophysical and well studies. Conclusions regarding the complexity of the geological conditions in the well are based on statistical information. The technical and technological parameters of the devices for eliminating complications and cleaning the well were studied on a stand equipped with a ZIF-650M drilling rig, NB-4 and NB-32 pumps, pressure gauges, a flow meter, a tachometer, and a coordinate controller. Studies of the properties of washing liquids were carried out on the basis of standardized methods and instruments. Mathematical and physical modeling was used with results processed in MATHCAD and EXCEL. Findings. The process of well construction was studied using the example of fields in the Dnipro-Donetsk depression. It has been proven that high quality of drilling, flushing and casing works will allow for efficient hydrocarbon production. Issues of technical and technological support for the elimination of stuck wells are considered. The features of bottomhole and wellbore flushing with a closed circulation system for drilling fluids have been studied. The characteristics of the processes of preparing a well for casing are given and regulations for carrying out work on cleaning complicated sections of the wellbore are proposed. Originality. Based on the data on the peculiarities of well construction in the Dnipro-Donetsk Basin, it has been proven that a rational scheme for field development is based on the need to implement comprehensive programs for the construction of wells that exclude the occurrence of geological and technical complications. Practical value. The results presented can serve as the basis for progressive methods for constructing wells that are located in clayey strata prone to the occurrence of sticking and cavities.
Research of cement stone permeability based on composite plugging material for oil and gas wells Ye.M. Stavychnyi, Ya.M. Femiak, O.Yu. Vytyaz, B.A. Tershak, M.M. Plytus, et al. Physics and Chemistry of Solid State, 2025 The article analyzes the state of hydrocarbon production potential of Ukraine with a review of oil and gas hard-to-recover reserves. Ensuring reliable delineation of horizons needs the forming of cement stone with appropriate characteristics. The importance of forming a high-quality insulating screen for oil and gas wells is confirmed, both in terms of hydrocarbon production and in terms of labor safety and environmental impact. The main technological parameters of the plugging mud based on material DRCT and cement PCT I-100, as well as their physical-and-mechanical properties of cement stone, were determined. According to the results of the research, both in terms of the parameters of the plugging mud and the physical-and-mechanical properties of the cement stone, an advantage and improved values of indicators were obtained for the plugging material based on composite cement DRCT compared to cement PCT I-100. T It was found that the formed cement stone based on material DRCT has a densely packed structure. The permeability of cement stone samples based on DRCT in fresh and formation water storage was evaluated. The gas permeability for the researched samples is almost the same, which indicates the absence of a degrading effect on the cement stone. The obtained results indicate that the material DRCT is suitable for cementing oil and gas well casing. The results of the introduction of the plugging material based on DRCT during the cementing of casing string diameter 127 mm in well No. 105 of the Verkhnyomaslovetske field confirmed the success of its application.
Well Rehabilitation is a Promising Area for Increasing Hydrocarbon Production Stanislav Piatkivskyi, Yevhen Stavychnyi, Yaroslav Femiak, Bohdan Tershak, Danyil Ahafonov, et al. Strojnicky Casopis Journal of Mechanical Engineering, 2024 This article provides a general description of the potential for increasing hydrocarbon production in Ukraine through the restoration of oil and gas wells by drilling sidetracks, based on an analysis of the fields resource potential. The main factors for selecting candidate wells for sidetracking are described. Each stage of well selection set during the design and direct drilling operations is supported by practical results. The main technical and technological solutions for well rehabilitation are described, taking into account the possibility of minimizing the cost of sidetrack drilling. The approaches to selecting and designing a sidetracked well profile are analyzed in detail. The technological scheme for drilling a sidetrack and the layout of the bottom of the drill string are substantiated. An algorithm for calculating the required length of weighted drill pipes and the length of the casing exit for sidetracking is presented. The peculiarities of using drilling fluids for deepening wells with an assessment of the impact on the coefficient of core permeability recovery are presented. The requirements for high-quality well casing are analyzed on the basis of an assessment of the possibility of running the casing in certain areas of sharp changes in the curvature parameters when drilling a well with a small-sized rock-destroying tool. The main functional criteria of the applied buffer systems are characterized and the necessity of using sedimentation-stable dispersion-reinforced grouting systems for high-quality cementing of sidetracks in conditions of small annular gaps is substantiated.
Increasing the reliability of oil and gas well fastening with polycomponent plugging systems Oleg Vytyaz, Oksana Chernova, Yevhen Stavychnyi, Rostyslav Martyniuk, Jan Ziaja Mining of Mineral Deposits, 2024 Purpose. Development of effective composite plugging systems for reliable fastening of oil and gas wells in difficult mining-geological conditions of deposits of Ukraine. Methods. The proposed research is based on an analytical and industrial study of the problems of the well construction and fastening in the conditions of chemogenic deposit occurrence when applying the analysis of geophysical research materials. The research of tamponage solutions and buffer liquids was carried out using standard devices and methods that meet the set of requirements for testing cements and technological systems for well construction. Processing of research results was carried out in MATHSAD and EXCEL. Composite cement CEM V according to the European standard EN 197-1, tamponage cement 1-G, krents - high-basic C2F CaSO4 and low-basic 3(CF) CaSO4 calcium sulfoferites were used for the research. Findings. It was established that the basic plugging material, as well as technological solutions for fastening wells in difficult mining-geological conditions, do not ensure compliance of the well as an engineering structure with operational reliability indicators. As a result, violations in the fastening system are quite often recorded, which require significant time and financial costs for their elimination, and sometimes lead to well liquidation. In order to increase the reliability of fastening wells, it is necessary to use multi-component tamponade systems modified by krents. Calcium sulfoferrite admixtures have been proved to accelerate the kinetics of early strength and contribute to the formation of cement stone with improved characteristics. The need to use effective buffer systems to improve the quality of fastening is substantiated. Originality. On the basis of assessment, systematization and detailed study of geophysical material and features of well fastening under the conditions of exposure to chemogenic sediments, the necessity of using composite plugging material was established. The conducted studies have proved that to ensure reliable fastening of wells in difficult mining-geological conditions, it is necessary to use multicomponent composite plugging material modified by calcium sulfoferites with accelerated kinetics of early strength, which form cement stone with a densely packed structure. Practical implications. Based on the industrial material evaluation and detailed laboratory studies, technological solutions have been developed to increase the reliability of well fastening due to the introduction of multi-component composite plugging material modified by krents and buffer liquids.
Fundamental principles and results of deep well lining Yevhen Stavychnyi, Yevhenii Koroviaka, Andrii Ihnatov, Oleksandr Matyash, Valerii Rastsvietaiev Iop Conference Series Earth and Environmental Science, 2024 The review of the theory and practice of the special technological fluids application is analyzed. On the example of a specific borehole, with an actual vertical depth of 3287 m, intended for opening horizons B-17v, B-17n and project B-21, measures to clarify the filtration and capacity properties of reservoir rocks, increase production volumes are considered of hydrocarbons and accelerating the rate of selection of mining reserves. Testing in the interval 3364 - 3337.6 m of the B-21 horizon by using a set of test tools KVI-95, objectively proved that the specified object is characterized as penetrating, gas-saturated, the activity of which is reduced by contamination of the near-outbreak zone of the seam. As a method of determining clogging, a cut of the working end of the core with a length of 1 mm was applied. According to the results of the interpretation of the materials of the geophysical research of the specified borehole, it was established that the seam fluid comes from the interval 3339 - 3344 m. The paper determined that a promising way to solve the issue of high-quality cementing is the application of composite tamponage systems in combination with advanced preparation methods of borehole shaft.
RESEARCH ON OCCURRENCE FEATURES AND WAYS TO IMPROVE THE QUALITY OF PRODUCTIVE HYDROCARBON HORIZONS DEMARCATION Ye. A Koroviaka, Ye. M Stavychnyi, O. B Martsynkiv, A. O Ihnatov, A. V Yavorskyi Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2024 Purpose. On the base of the geological cross-section analysis of the productive stratum and the features of the filtration-capacitance characteristics of the reservoir rocks, to develop effective technological fastening schemes for the delimitation of closely located different-pressure and different-saturated horizons on the example of the Romny group deposits. Methodology. The proposed work is an analytical and production research on the geological-and-lithological structure features of borehole sections of the Romny structure and the results of their drilling and cementing based on the analysis of electrical, pulsed neutron-neutron, acoustic and other types of loggings. The data on the spectrum of the oil and gas boreholes properties cores was obtained on the basis of macroscopic description, methodical and practical methods of lithological, sedimentological, and facies analysis. The filtration capacity of permeable reservoir rocks was examined with the application of the Darcy’s device. Modern methods of experimental research analysis using mathematical and physical modeling techniques, methods for processing research results in SolidWorks, STATGRAPHICS, MATHSAD, EXCEL, control and measuring devices were applied. Findings. It has been established that currently applied fastening methods do not provide the prerequisites for high-quality delineation of productive horizons, as a result of which interlayer flows occur, that is lead to the loss of the potential flow rate of the boreholes and increasing in the cost of hydrocarbon production. A new design of the borehole is proposed in order to increase the reliability of the fastening. It has been proven that the effectiveness of opening oil-saturated reservoirs increases with the application of specialized drilling flushing fluids capable of minimizing the risk of their clogging. The necessity of cementing the production column and the shank with tamponage materials based on composite cements is substantiated, while effective buffer systems should be applied to separate process fluids. Originality. On the base of the systematization and correlation of the geophysical material, the specific features of the structure of the productive strata of B-18 and B-19 horizons were evaluated as well as the nature and degree of saturation, the filtration-capacity characteristics of the seams. It has been proven that in order to reliably cover the high-pressure water-bearing horizon B-18 with an operational column, it is recommended to include packer systems of various types of activation in the equipment. Practical value. On the basis of the detailed multifaceted results of laboratory and industrial testing and analytical model research, technological solutions have been developed for boreholes fastening in the conditions of the occurrence of closely located productive horizons of different pressures and different saturations on the example of the Romny group deposits.
Research of cement stone degradability in difficult mining and geological conditions of Ukraine Ye.M. Stavychnyi, Ya.M. Femiak, O.Yu. Vytyaz, B.A. Tershak, M.M. Klymyuk, et al. Physics and Chemistry of Solid State, 2024 The features and prospects of hydrocarbon potential of Ukraine are analyzed. It is established that the basic resource of oil and gas deposits is concentrated in difficult mining and geological conditions. The formulations of basic plugging materials were researched and their sedimentation stability destruction was established. The influence of technological processes during well completion on the casing and cementing system is assessed and the impact of these operations on the state of the insulating ring in the well is characterized. The degradability of cement stone based on base cements PCT I-100 was assessed by visual research and X-ray phase analysis (XPA). The deformation of stone samples under the influence of an aggressive medium and the almost complete absence of binding crystalline hydrates in the samples at XPA were established. The results obtained indicate the need to use degradation-resistant plugging materials. The advantages of plugging systems based on composite cements are characterized and typical modifiers that can be used to regulate the properties of plugging mud and cement stone are presented. The influence of an aggressive environment on cement stone based on composite material DRCT was researched. Quantitative analysis of the elemental composition and XPA of the researched samples of DRCT cement stone in aggressive mediums of magnesium chloride and sulfuric acid confirms the corrosion resistance of the stone made of material DRCT. The research results allow us to recommend the cementing material DRCT for cementing oil and gas wells in difficult mining and geological conditions.
Analysis of reservoir delineation problems in complicated conditions I. Vytvytskyi, O. Martsynkiv, I. Kovbasiuk, M. Seniushkovych, Y. Stavychnyi, et al. 16th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment Monitoring 2022, 2022
