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Документ Optimization Principles Implementation in the Innovative Technologies for Re-used Extraction Workings Maintenance(2022) Bondarenko, V. I.; Kovalevska, I. A.; Biletskyi, V. S.; Desna, N. A.This paper studies the main approaches to optimization principles implementation in innovative technologies for reused mine workings. Based on the experimental data processing and using the correlation analysis methods, the possibility of achieving the correspondence of the deformation-strength characteristics of the fastening structures to the optimal values of loads and displacement, at which the intensity of rock pressure manifestations is minimal, has been proved. A series of multivariate computational experiments with various mining-and-geological and mining-engineering factors have been conducted to determine the characteristics of the fastening structures in the conditions of the Western Donbass coal mines (Ukraine). Based on the comparative analysis of the experiment and analytical calculations, it is possible to represent recommendations for the use of the combined roof-bolting systems in difficult mining-and-geological conditions when maintaining reused extraction coal-mine workings.Документ Specifying the Methods to Calculate Thermal Efficiency of a Dual Production Well System "Fluid-Geoheat"(2022) Fyk, M. I.; Biletskyi, V. S.; Abbood, M.; Desna, N. A.Methods to calculate thermal efficiency of dual production well system “fluid-geoheat” have been specified for conditionally thin productive fluid-saturated seam in terms of radial planar filtration. It has been demonstrated that relative to a variant, ignoring Joule-Thompson effect, and variant of discrete Joule–Thomson coefficient substitution, calculation accuracy as for the well heat efficiency increases by 33% and 9% respectively. It has been proved that it is expedient for a conditionally thin seam to use effective temperature within the heat-exchange equitation with Fourier substitution as related to heat transfer while considering heat input in terms of unidirectional input to a virtual disk plate from the seam floor. In the context of the proposed calculation methods, increase in numerical estimations of thermal efficiency of a well results from the consideration of extra heat pumping owing to Joule-Thompson effect by rocks adjoining the productive formation.Документ A methodology for calculating the productivity of a hydrocarbon-geothermal well(2021) Fyk, M. I.; Biletskyi, V. S.; Desna, N. A.The article deals with the development of a refined methodology for calculating the production rate of a hydrocarbon-geothermal well under a non-isothermal lifting mode. The proposed methodology compares favourably with the basic one by taking into account the mutual influence of pressure head losses and those of thermal energy. This problem was solved by taking into consideration the convective component of heat exchange in a vertical (inclined) pipe when assessing hydraulic pressure head losses due to viscous friction. The methodology was tested for the conditions of Kotelev gas condensate field. The discrepancy between the values calculated according to the basic and the proposed methodologies for the heat flow rate constitute 4-7 % on average, while for the fluid flow rate the discrepancy averages 2.5-8.5 %. The possibility was proved of optimizing the dual mode of operation of a hydrocarbon-geothermal well in terms of the combined thermal energy being produced and the caloric heat energy of the gas condensate combustion.Документ Heat-Resistant Backfill Materials, Expanding During Hardening(2021) Orlovskyi, V. M.; Biletskyi, V. S.; Desna, N. A.; Ponomarenko, N. V.The article analyzes the problem of improving the quality of demarcation of rocks, oil as well as gas horizons. The results of theoretical and experimental researches of the backfill materials expanding at hardening on the basis of ash mixes are stated. Clinker heat-resistant autoclave hardening backfill materials that expand during hardening, with high performance properties on the basis of man-made by-products of industry have been developed and studied. The selection of optimal formulations of new heat-resistant backfill materials of autoclave hardening, which expand during hardening, is carried out. The results of the work have practical application in the cementation of oil and gas wells in complex mining and geological conditions in exploration areas and industrial fields of oil and natural gas as well as gas condensate.