Modern trends in the global energy market linked to the Sustainable Development Goals often lead to the adoption of political decisions with little basis in fact. Stepping up the development of renewable energy sources is an economically questionable but necessary step in terms of its social and ecological effects. However, subsequent development of hydrogen infrastructure is, at the very least, a dangerous initiative. In connection with mentioned above, an attempt to examine hydrogen by conducting an integral assessment of its characteristics has been made in this article. As a result of the research conducted, the following conclusions concerning the potential of the widespread implementation of hydrogen in the power generation sector have been made: as a chemical element, it harms steel structures, which significantly impedes the selection of suitable materials; its physical and volume characteristics decrease the general efficiency of the energy system compared to similar hydrocarbon solutions; the hydrogen economy does not have the necessary foundation in terms of both physical infrastructure and market regulation mechanisms; the emergence of widely available hydrogen poses a danger for society due to its high combustibility. Following the results of the study, it was concluded that the existing pilot hydrogen projects are positive yet not scalable solutions for the power generation sector due to the lack of available technologies to construct large-scale and geographically distributed infrastructure and adequate international system of industry regulation. Thus, under current conditions, the risks of implementing such projects considerably exceed their potential ecological benefits.
Article presents results of study on possibility of increasing the efficiency of drilling directional straight sections of wells using screw downhole motors (SDM) with a combined method of drilling with rotation of drilling string (DS). Goal is to ensure steady-state operation of SDM with simultaneous rotation of DS by reducing the amplitude of oscillations with adjusting the parameters of drilling mode on the basis of mathematical modeling for SDM – DS system. Results of experimental study on determination of extrema distribution of lateral and axial oscillations of SDM frame depending on geometrical parameters of gerotor mechanism and modes ensuring stable operation are presented. Approaches to development of a mathematical model and methodology are conceptually outlined that allow determining the range of self-oscillations for SDM – DS system and boundaries of rotational and translational wave perturbations for a heterogeneous rod with an installed SDM at drilling directional straight sections of well. This mathematical model of SDM – DS system's dynamics makes it possible to predict optimal parameters of directional drilling mode that ensure stable operation of borehole assembly.
The role of the Holodninsky ore deposit in ensuring need of the Russian Federation in extremely scarce raw materials – zinc and lead is shown. Technical solutions for decrease in ecological risks at extraction of this ore deposit are considered. Conclusions are drawn on prospects of extraction of the Holodninsky ore deposit.
Technological solutions of ore loss reduction in interchamber pillars at bottom levels design of Gubkin mine are developed. Research based on physical (with the use of equivalent materials) and mathematical (finite element method) modelling has been carried out. The requirement for pilot work before industrial scale use is established.
Article is in touch with mining industry and devoted to the analysis and generalization of world experience of underground mining of kimberlitic tubes underquarry reserves. In it the urgency of research of new technologies of underground mining of kimberlitic tubes underquarry reserves in the conditions of the deposits, developed by «ALROSA». The mining technology of kimberlitic tubes water-bearing underquarry reserves excavation is described.
It shows the experimental results connected with creating of effective compositions of technological fluids for drilling and repair of oil and gas wells.
The problem of dispersion of a flat wave of vertical polarisation by a plasma layer with a maximum of electronic concentration and infinitesimal losses is considered. With use of the theorem of an average in the new way it is proved that the wave of vertical polarisation will not pass for a point with the maximum of electronic concentration if loss in layer to direct to zero.
Приветственное слово.
Россия, являясь одним из крупнейших мировых производителей полезных ископаемых, занимает ведущее место в мире по его экспорту, а ее горно-добывающая промышленность играет важнейшую роль в экономическом и социальном устройстве российского общества. Продолжающийся спад производства минеральных ресурсов, ухудшение сырьевой базы действующих предприятий, огромное сокращение добывающих мощностей и неприятие мер по их восполнению не способствуют созданию благоприятного инвестиционного климата, что может привести в самое ближайшее время к ситуации, когда страна с огромными запасами сырьевых ресурсов практически потеряет контроль за их эффективным использованием. Главная цель работы – подчеркнуть необходимость срочного изменения системы государственного подхода к управлению минерально-сырьевым комплексом посредством принятия «Политики правительства России в области минерального сырья». Концепция устойчивого развития нашей экономики требует срочного пересмотра прежнего отношения к рассмотрению вопросов, связанных с минеральным сырьем, в контексте единства экономических и социальных целей и задач.
Greetings from the Chief Editor with the release of the jubilee volume in honor of the 110th anniversary of the Journal of the Mining Institute.
Paper presents the analysis of the investigation results of vibrational accelerations and beating amplitudes of the downhole drilling motor, which help to define the ranges of optimum energy characteristics of the gerotor mechanism, ensuring its stable operation. Dependencies describing the operation of the «drilling bit – rotary steerable system with power screw section – drilling string» system and the values of the self-oscillation boundaries and the onset of system resonance when it is used jointly, were defined as a result of computational and full-scale experimental research. A mathematical model is proposed, which allows determining the optimal range of technological parameters for well drilling, reducing the extreme vibration accelerations of the bottomhole assembly by controlling the torque-power and frequency characteristics of the drilling string, taking into account the energy characteristics of the power screw section of the rotary steerable system. Recommendations on the choice of drilling mode parameters were given.
