Submit an Article
Become a reviewer

Search articles for by keywords:
экономическая устойчивость

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2024-03-20
  • Date accepted
    2024-11-07
  • Date published
    2025-04-28

Analysis of the stress state of rocks transformation near a horizontal well during acid treatment based on numerical simulation

Article preview

The article presents an overview of the assessment and modelling of the stress state of rocks in the near-wellbore zone of horizontal wells during acid stimulation of the formation for improving the efficiency of oil and gas field development. A numerical finite element model of near-wellbore zone of the reservoir drilled by a horizontal section was compiled using one of oil fields in the Perm Territory as an example. The distribution of physical and mechanical properties of the terrigenous reservoir near the well was determined considering transformation under the action of mud acid for different time periods of its injection. Multivariate numerical simulation was performed and the distribution of horizontal and vertical stresses in near-wellbore zone was determined with regard for different values ​​of pressure drawdown and changes in stress-strain properties depending on the area of ​​mud acid infiltration. It was found that a change in elastic modulus and Poisson's ratio under the influence of acid led to a decrease in stresses in near-wellbore zone. Analysis of the stress distribution field based on the Coulomb – Mohr criterion showed that the minimum safety factor of rock even after the effect of mud acid was 1.5; thus, under the considered conditions of horizontal well modelling, the reservoir rock remained stable, and no zones of rock destruction appeared.

How to cite: Popov S.N., Chernyshov S.E., Wang X. Analysis of the stress state of rocks transformation near a horizontal well during acid treatment based on numerical simulation // Journal of Mining Institute. 2025. Vol. 272 . p. 110-118. EDN VOBTXU
Economic Geology
  • Date submitted
    2023-11-15
  • Date accepted
    2024-09-24
  • Date published
    2024-12-25

Development and validation of an approach to the environmental and economic assessment of decarbonization projects in the oil and gas sector

Article preview

This article addresses the problem of selecting a priority decarbonization project for an oil and gas company aiming to reduce greenhouse gas emissions. The wide range of decarbonization options and assessment methods prompted the development of a comprehensive ranking system for project selection. This system incorporates both internal and external factors of project implementation, a two-stage algorithm that filters out unsuitable projects taking into account sustainable development goals, and a quantitative evaluation approach using absolute and relative indicators. The proposed system evaluates decarbonization projects by considering not only the reduction of emissions in both absolute and relative terms, but also the broader environmental, social, and economic aspects relevant to the oil and gas company and the national economy. It includes a ranking mechanism for identifying priority projects and integrates carbon regulation incentives and green taxonomy tools into the economic assessment for more precise comparative analysis. The quantitative assessment in absolute terms involves a specialized net present value calculation, which accounts for revenue from both carbon credit sales and the potential sale of new low-carbon products, if applicable. The proposed assessment provides for targeted analysis of specific performance indicators, such as the cost per unit of emissions reduced, tax and social security contributions per unit of emissions reduced, energy efficiency improvements, and other indicators used for additional assessments of projects under otherwise equal conditions.

How to cite: Sheveleva N.A. Development and validation of an approach to the environmental and economic assessment of decarbonization projects in the oil and gas sector // Journal of Mining Institute. 2024. Vol. 270 . p. 1038-1055. EDN GAOTZW
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2024-03-29
  • Date accepted
    2024-06-03
  • Date published
    2024-07-04

Potential use of water treatment sludge for the reclamation of small-capacity sludge collectors

Article preview

In small settlements, collectors for the sludge produced during water treatment processes are small-sized and located in the vicinity of drinking water storage reservoirs or in coastal areas. Sludge removal is not economical. Besides, the relief depressions formed after sludge disposal are required to be reclaimed. In ore mining regions, where the main settlements of the Urals are located, sludge produced in water treatment has high contents of heavy metals typical of ore mining provinces. Consequently, places of sludge accumulation are potential sources of water pollution. The article discusses the possibility to mix sludge with slaked lime and local overburden with the help of special equipment. So far water treatment sludge in the region has been used to reclaim the surface of solid waste landfills by creating anaerobic conditions for waste decomposition. When placed inside the embankment dams as an independent object, sludge needs to be improved for the increase of its bearing capacity and the ability to bind heavy metals. The article aims at the substantiation of the composition and properties of the reclamation material made of the water treatment sludge mixed with local overburden and slaked lime (technosoil). For this reason the paper describes the composition of the sludge in a sludge collector, the composition and properties of the overburden rocks as a component of the mixtures with water treatment sludge, the composition and properties of the mixtures of water treatment sludge with overburden rocks and Ca(OH)2 as a component dewatering sludge and neutralizing toxicants. Furthermore, the research work provides the technology created for the optimal processing of the water treatment sludge in the process of the reclamation of a sludge collector. The research results and the experience obtained in reclamation of disturbed lands in the region have confirmed the possible use of technosoil for the reclamation of small-capacity sludge collectors. The analysis of the chemical composition and physical and mechanical properties of the mixtures under study has shown that the most economical and environmentally sound reclamation material is a mixture of water treatment sludge, loose overburden dump soils and Ca(OH)2 in a ratio of 60 : 30 : 10 %.

How to cite: Guman O.M., Antonova I.A. Potential use of water treatment sludge for the reclamation of small-capacity sludge collectors // Journal of Mining Institute. 2024. Vol. 267 . p. 466-476. EDN MSIDNU
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2024-03-07
  • Date accepted
    2024-06-14
  • Date published
    2024-07-04

Anomaly detection in wastewater treatment process for cyber resilience risks evaluation

Article preview

Timely detection and prevention of violations in the technological process of wastewater treatment caused by threats of different nature is a highly relevant research problem. Modern systems are equipped with a large number of technological sensors. Data from these sensors can be used to detect anomalies in the technological process. Their timely detection, prediction and processing ensures the continuity and fault tolerance of the technological process. The aim of the research is to improve the accuracy of detection of such anomalies. We propose a methodology for the identification and subsequent assessment of cyber resilience risks of the wastewater treatment process, which includes the distinctive procedure of training dataset generation and the anomaly detection based on deep learning methods. The availability of training datasets is a necessary condition for the efficient application of the proposed technology. A distinctive feature of the anomaly detection approach is a new method of processing input sensor data, which allows the use of computationally efficient analytical models with high accuracy of anomaly detection, and outperforms the efficiency of previously published methods.

How to cite: Novikova E.S., Fedorchenko E.V., Bukhtiyarov M.A., Saenko I.B. Anomaly detection in wastewater treatment process for cyber resilience risks evaluation // Journal of Mining Institute. 2024. Vol. 267 . p. 488-500. EDN TBPPHN
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-07-25
  • Date accepted
    2024-05-02
  • Date published
    2024-08-26

Finite element analysis of slope failure in Ouenza open-pit iron mine, NE Algeria: causes ‎and lessons for stability control

Article preview

Slope failures in mining engineering pose significant risks to slope stability control, necessitating a thorough investigation into their root causes. This paper focuses on a back analysis of a slope failure in the Zerga section of the Ouenza – Algeria open-pit iron mine. The primary objectives are to identify the causes of slope failure, propose preventive measures, and suggest techniques to enhance stability, thereby providing crucial insights for monitoring slope stability during mining operations. The study commenced with a reconstruction of the slopes in the affected zones, followed by a numerical analysis utilizing the Shear strength reduction method within the Finite element method (SSR-FE). This approach enables the examination of slope stability under both static and dynamic loads. The dynamic load assessment incorporated an evaluation of the vibrations induced by the blasting process during excavation, introducing seismic loading into the finite element analysis. The findings reveal that the primary triggering factor for the landslide was the vibration generated by the blasting process. Furthermore, the slope stability was found to be critically compromised under static loads, highlighting a failure to adhere to exploitation operation norms. The challenging geology, particularly the presence of marl layers where maximum shear strain occurs, contributed to the formation of the landslide surface. The study not only identifies the causes of slope failure but also provides valuable lessons for effective slope stability management in mining operations.

How to cite: Belgueliel F., Fredj M., Saadoun A., Boukarm R. Finite element analysis of slope failure in Ouenza open-pit iron mine, NE Algeria: causes ‎and lessons for stability control // Journal of Mining Institute. 2024. Vol. 268 . p. 576-587. EDN XIQXNW
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-04-11
  • Date accepted
    2023-09-20
  • Date published
    2023-10-27

Current state of above-ground and underground structures of the Alexander Column: an integral basis for its stability

Article preview

The Alexander Column as a compositional center of the architectural ensemble of Palace Square in Saint Petersburg, Russia, has always been a matter of concern for both the public and specialists due to progressive deterioration of its granite shaft caused by crack formation. The article examines previous studies related to the inspection and restoration of the column's shaft and other parts above ground level, as well as reasons for crack initiation and propagation in the column. An analysis was performed on the anomalies in the Fennoscandian Shield and the structural-tectonic conditions at the Montferrand quarry site, revealing the presence of faults and circular features within the studied area. The research considers N.Hast's measurements of excess tectonic stresses in anomaly zones (southeastern Finland), which acted horizontally and resulted in the development of tensile cracks within the granite massif and later in the column’s shaft after its installation. The most dangerous type of deformation for the Alexander Column is its tilt in the northeast direction, recorded in 1937 and 2000. The article analyzes the construction features of the column's foundations and additional underground elements, as well as soil and groundwater characteristics based on archival data. The contamination history of the underground space is taken into account, and an analogy-based method is used to assess the engineering-geological and hydrogeological conditions of the underground load-bearing structures within the placement zone of the Alexander Column and the New Hermitage buildings. The results of visual observations on the nature of deterioration and deformation of the pavement around the monument, as well as its pedestal, indicating the development of uneven settlement of the foundation, are presented. The article concludes with general recommendations for organizing and implementing comprehensive monitoring to forecast the deformation dynamics of the Alexander Column.

How to cite: Dashko R.E., Karpenko A.G. Current state of above-ground and underground structures of the Alexander Column: an integral basis for its stability // Journal of Mining Institute. 2023. Vol. 263 . p. 757-773. EDN OSYEHQ
Economic Geology
  • Date submitted
    2022-03-09
  • Date accepted
    2022-11-17
  • Date published
    2023-02-27

Development of methodology for economic evaluation of land plots for the extraction and processing of solid minerals

Article preview

The Russian economy has a pronounced resource specialization; in many regions, subsoil use is a backbone or one of the main areas of the economy. In these conditions, the improvement of the methodology for the economic evaluation of lands on which mining enterprises are located is of particular relevance. On the basis of the existing experience in assessing industrial land, the authors present a developed methodology for determining the cadastral value of land plots where mining enterprises are located, taking into account their industry characteristics and the specifics of production and commercial activities. At the same time, cadastral valuation is considered as a specific form of economic valuation. Particular emphasis is placed on the importance of taking into account the cost factors that have the greatest impact on the formation of the cost of land for the extraction and processing of solid minerals, and the method of assessment depending on the characteristics of the object. To carry out theoretical research, the methods of analysis and synthesis of legal and scientific and technical literature in the field of cadastral and market valuation of land were used in the work. The practical part is based on the application of expert methods, including the method of analysis of hierarchies, system and logical analysis. The method of M.A.Svitelskaya was chosen as the basis, which presents a combination of modified methods of statistical (regression) modeling and modeling based on specific indicators of cadastral value. The use of this technique in economic practice contributes to increasing the efficiency of cadastral valuation and the objectivity of its results.

How to cite: Bykowa E.N., Khaykin М.М., Shabaeva Y.I., Beloborodova М.D. Development of methodology for economic evaluation of land plots for the extraction and processing of solid minerals // Journal of Mining Institute. 2023. Vol. 259 . p. 52-67. DOI: 10.31897/PMI.2023.6
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-04-20
  • Date accepted
    2022-04-26
  • Date published
    2022-07-13

Prediction of the stress-strain state and stability of the front of tunnel face at the intersection of disturbed zones of the soil mass

Article preview

The article presents a numerical solution of the spatial elastic-plastic problem of determining the stability of the tunnel face soils at the intersection of disturbed zones of the soil mass. The relevance of the study is related to the need to take into account the zones of disturbed soils when assessing the face stability to calculate the parameters of the support. Based on the finite element method implemented in the PLAXIS 3D software package, the construction of a finite element system "soil mass-disturbance-face support" and modeling of the intersection of the disturbed zones of the soil mass were performed. To assess the condition of soils, deformation and strength criteria are taken. The deformation criterion is expressed by the value of the calculated displacement of the tunnel contour in the face, and the strength criterion - by the safety coefficient until the maximum values of the stress state are reached according to the Coulomb–Mohr criterion. The results of the study are presented in the form of histograms of the safety coefficient dependences on the distance to the disturbance at different bending stiffness of the face support structure, as well as the isofields of deformation development. The parameters of rockfall formation in the face zone at the intersection of zones of disturbed soils were determined. The local decrease in strength and deformation properties in the rock mass along the tunnel track should be taken into account when assessing the stability of the tunnel face and calculating the parameters of the support. Within the framework of the constructed closed system, a qualitative agreement of the simulation results with the case of a collapse in the face during the construction of the Vladimirskaya-2 station of the St. Petersburg Metro was obtained.

How to cite: Protosenya A.G., Alekseev A.V., Verbilo P.E. Prediction of the stress-strain state and stability of the front of tunnel face at the intersection of disturbed zones of the soil mass // Journal of Mining Institute. 2022. Vol. 254 . p. 252-260. DOI: 10.31897/PMI.2022.26
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-07-05
  • Date accepted
    2022-01-24
  • Date published
    2022-04-29

Ensuring the excavation workings stability when developing excavation sites of flat-lying coal seams by three workings

Article preview

On the basis of analysis of mining plans and field studies at mines of JSC SUEK-Kuzbass, it is shown that in conditions of increasing the size of excavation columns during the development of flat-lying coal seams the stress-strain state of the rock mass along the workings length changes significantly. The necessity of predicting the stress-strain state at the design stage of the workings timbering standards, as well as subsequent monitoring of the workings roof state and its changes in the mining operations using video endoscopes, is noted. The results of numerical studies of the stress-strain state of the rock mass during the development of excavation sites by three workings for various combinations of width of the pillars between the workings for mining-geological and mining-technical conditions of the “Taldinskaya-Zapadnaya-2” mine are provided. The stresses in the vicinity of the three workings are compared with the values obtained during the development of the excavation sites by double drift. A set of recommendations on the choice of the location of the workings, the width of pillars, timbering standards that ensure the stable condition of the workings throughout the entire service life at the minimal losses of coal in the pillars is presented.

How to cite: Kazanin O.I., Ilinets A.A. Ensuring the excavation workings stability when developing excavation sites of flat-lying coal seams by three workings // Journal of Mining Institute. 2022. Vol. 253 . p. 41-48. DOI: 10.31897/PMI.2022.1
Energy industry
  • Date submitted
    2021-03-11
  • Date accepted
    2021-04-12
  • Date published
    2022-04-29

Operation mode selection algorithm development of a wind-diesel power plant supply complex

Article preview

The power supply system is affected by external disturbances, so it should be stable and operate normally in compliance with power quality standards. The power supply system goes into abnormal modes operation when, after a short-term failure or disturbance, it does not restore normal mode. The electrical complex, which includes a wind power plant, as well as a battery and a diesel generator connected in parallel, is able to provide reliable power supply to consumers which meets the power quality indicators. The article develops an algorithm that is implemented by an automatic control system to select the operating mode depending on climatic factors (wind) and the forecast of energy consumption for the day ahead. Forecast data is selected based on the choice of the methods, which will have the smallest forecast error. It is concluded that if the energy consumption forecast data is added to the automatic control system, then it will be possible to increase the efficiency of the power supply complex. In the developed algorithm the verification of normal and abnormal modes of operation is considered based on the stability theory. The criteria for assessing the normal mode of operation are identified, as well as the indicators of the object’s load schedules for assessing the load of power supply sources and the quality standards for power supply to consumers for ranking the load by priority under critical operating conditions and restoring normal operation are considered.

How to cite: Shklyarskiy Y.E., Batueva D.E. Operation mode selection algorithm development of a wind-diesel power plant supply complex // Journal of Mining Institute. 2022. Vol. 253 . p. 115-126. DOI: 10.31897/PMI.2022.7
Oil and gas
  • Date submitted
    2021-02-09
  • Date accepted
    2021-07-27
  • Date published
    2021-10-21

Development of an algorithm for determining the technological parameters of acid composition injection during treatment of the near-bottomhole zone, taking into account economic efficiency

Article preview

Relevance of the research is due to the low proportion of successful hydrochloric acid treatments of near-bottomhole zones of carbonate reservoirs in the Perm region caused by insufficiently careful design and implementation of measures to stimulate oil production. Within the framework of this article, the development of a program is presented, which is based on an algorithm that allows determining the volume and rate of injection for an acid composition into a productive formation corresponding to the maximum economic efficiency during hydrochloric acid treatment. Essence of the proposed algorithm is to find the greatest profit from measures to increase oil recovery, depending on the cost of its implementation and income from additionally produced oil. Operation of the algorithm is carried out on the principle of enumerating the values ​​of the volume and rate of injection for the acid composition and their fixation when the maximum difference between income and costs, corresponding to the given technological parameters of injection, is reached. The methodology is based on Dupuis's investigations on the filtration of fluids in the formation and the results of the experiments by Duckord and Lenormand on the study of changes in the additional filtration resistance in the near-well zone of the formation when it is treated with an acid composition. When analyzing and including these investigations into the algorithm, it is noted that the developed technique takes into account a large number of factors, including the lithological and mineralogical composition of rocks, technological parameters of the injection of a working agent and its properties, well design, filtration properties of the formation, properties of well products. The article provides an algorithm that can be implemented without difficulty using any programming language, for example, Pascal. Selection of the optimal values ​​for the volume and rate of injection is presented in this paper, using the example of a production well at the Chaikinskoye oil field, located within the Perm region. Introduction of the developed algorithm into the practice of petroleum engineering will allow competent and effective approach to the design of hydrochloric acid treatments in carbonate reservoirs without a significant investment of time and additional funds.

How to cite: Krivoshchekov S.N., Kochnev A.A., Ravelev K.A. Development of an algorithm for determining the technological parameters of acid composition injection during treatment of the near-bottomhole zone, taking into account economic efficiency // Journal of Mining Institute. 2021. Vol. 250 . p. 587-595. DOI: 10.31897/PMI.2021.4.12
Mining
  • Date submitted
    2021-06-15
  • Date accepted
    2021-08-27
  • Date published
    2021-10-21

Prospects for the use of modern technological solutions in the flat-lying coal seams development, taking into account the danger of the formation of the places of its spontaneous combustion

Article preview

Spontaneous combustion of coal remains an important problem for coal mines, which can lead to an explosion of methane and coal dust. Accidents associated with spontaneous combustion of coal can cause significant economic losses to coal mining companies, as well as entail social damage – injuries and loss of life. Accidents are known at the Kuzbass mines, which occurred as a result of negligent attitude to the danger of spontaneous combustion of coal, the victims of which were dozens of people. The analysis of emergency situations associated with spontaneous combustion of coal shows that the existing wide range of means of preventing endogenous fires does not provide complete safety when working out coal seams prone to spontaneous combustion, therefore, spontaneous combustion places continue to occur in mines. The consequences that may arise as a result of a methane explosion initiated by a self-ignition place indicate the need to improve the used technologies. The purpose of the work is to determine the impact of modern technological solutions used in functioning mines during underground mining of flat-lying coal seams prone to spontaneous combustion, and to develop new solutions that reduce endogenous fire hazard. Conclusions on the influence of leaving coal pillars in the developed space, isolated air removal from the stoping face through the developed space, the length of the stoping face and the excavation pillar, and other factors on the danger of the formation of spontaneous combustion places are presented. Conclusions about the possibility of using modern technological solutions in future are also drawn.

How to cite: Zubov V.P., Golubev D.D. Prospects for the use of modern technological solutions in the flat-lying coal seams development, taking into account the danger of the formation of the places of its spontaneous combustion // Journal of Mining Institute. 2021. Vol. 250 . p. 534-541. DOI: 10.31897/PMI.2021.4.6
Geology
  • Date submitted
    2021-01-19
  • Date accepted
    2021-07-27
  • Date published
    2021-10-21

Geological and structural characteristics of deep-level rock mass of the Udachnaya pipe deposit

Article preview

For hard rock massifs, structural disturbance is a key indicator of mining structure stability. The presence of intersecting structural elements in the massif reduces rock strength and leads to formation of potential collapse structures. In addition to that, disjunctive deformations that penetrate rock strata serve as channels for fluid migration and connect aquifers into a single system. It was established that the largest of them –faults of east-northeastern, northeastern and northwestern directions – form the kimberlite-bearing junction of the Udachnaya pipe. These faults represent zones of increased fracturing, brecciation and tectonic foliation, distinguished from adjacent areas by increased destruction of the rock mass. Specifics of tectonic fracture distribution within structural and lithological domains are determined by the presence of multidirectional prevailing systems of tectonic fracturing, as well as by differences in their quantitative characteristics. With some exceptions, the main systems form a diagonal network of fractures (northeastern – northwestern orientation), which is typical for larger structural forms – faults. Despite the differences in dip orientation of the systems, most of them correspond to identified directions, which is typical for both kimberlites and sedimentary strata. Overall disturbance of the massif, expressed in terms of elementary block volume, reaches its peak in the western ore body. For such type of deposits, friction properties of fracture structures have average values. Consideration of geological and structural data in the design and development of new levels of the deposit will allow to maintain the necessary balance between efficiency and safety of performed operations.

How to cite: Serebryakov E.V., Gladkov A.S. Geological and structural characteristics of deep-level rock mass of the Udachnaya pipe deposit // Journal of Mining Institute. 2021. Vol. 250 . p. 512-525. DOI: 10.31897/PMI.2021.4.4
Oil and gas
  • Date submitted
    2019-05-14
  • Date accepted
    2019-07-05
  • Date published
    2020-04-24

Development of spacer fluids and cement slurries compositions for lining of wells at high temperatures

Article preview

Article is devoted to creation of new compositions of process solutions for lining of directional wells at high temperatures. Developed compositions provide high durability characteristics of cement stone. It is shown that with an increase in packing density of cementing slurry components durability characteristics increase and porosity and permeability of cement stone decrease, whereas an increase in temperature and pressure leads to a significant increase in compressive and bending durability, which is associated with presence of quartz in them. It has been established that introduction of special structure-forming additives to the composition of developed cementing solutions allows formation of sedimentation-resistant cement systems that can provide an increase in durability characteristics of cement stone and, in general, quality lining of directional wells. Study of rheological properties of developed cementing compositions showed that the systems have high yield strength at increased temperatures and pressures. Developed compositions of water-based spacer fluids increase the cleansing degree for both casing and rocks surfaces from mud and clay cake residues, which improves the cementing quality of oil and gas wells. Mechanism for increasing the washing ability of spacer fluids and durability characteristics of cement stone, depending on composition and properties of their constituent components, is disclosed.

How to cite: Tabatabaee Moradi S.S., Nikolaev N.I., Nikolaeva T.N. Development of spacer fluids and cement slurries compositions for lining of wells at high temperatures // Journal of Mining Institute. 2020. Vol. 242 . p. 174-178. DOI: 10.31897/PMI.2020.2.174
Mining
  • Date submitted
    2020-01-09
  • Date accepted
    2020-01-17
  • Date published
    2020-02-25

Methodology for Calculating the Stability of the Polymer Operating String in Permafrost

Article preview

The goal of this paper is to develop a methodology for calculating the stability of an annular cross-section string casing made of polymer material used for the development of mineral deposits by underground leaching in permafrost formations. The aim was to determine the geometric parameters of the casing and to ensure its operational reliability. The relevance of the research is associated with the peculiarities of external influences on the string, for example, a geotechnological well operating in permafrost formation under conditions of additional exposure to ice pressure during freezing of water in the borehole annulus. This effect is usually accompanied by deformation of the casing due to ice pressure, which can lead to string collapse, abnormal operation and the risk of contamination of the geological environment. The proposed calculation method for a polymer casing is based on simulation of objects using the finite element method. We used the spatial finite elements to model the interaction of key elements of the geotechnological natural-technogenic complex: a polymer casing, ice in the annulus space and homogeneous or heterogeneous rock masses adjacent to the well. The results of the study are presented in the form of tables and patterns of displacements, which reflect stresses and strains in the elements of the calculation scheme. The analysis of the obtained results confirms the possibility of using polymer casings of different technological purposes in various conditions of permafrost formation, including extreme ones. The results of the redistribution of pressure created by ice during the freezing of water in the borehole annulus to the rock mass and the string are evaluated. Interdependent deformations of the rock mass and operating string during freezing of water in the borehole annulus are determined. The necessity of considering the properties of the rock mass in determining the pressure on the string is established. The conditions for the collapse of the string with a different combination of its parameters are revealed.

How to cite: Stetukha V.A., Zheleznyak I.I. Methodology for Calculating the Stability of the Polymer Operating String in Permafrost // Journal of Mining Institute. 2020. Vol. 241 . p. 22-28. DOI: 10.31897/PMI.2020.1.22
Mining
  • Date submitted
    2019-04-27
  • Date accepted
    2019-07-10
  • Date published
    2019-10-23

Estimation of Rock Mass Strength in Open-Pit Mining

Article preview

The paper presents results of an experimental study on strength characteristics of the rock mass as applied to the assessment of open-pit slope stability. Formulas have been obtained that describe a correlation between ultimate and residual strength of rock samples and residual shear strength along the weakening surface. A new method has been developed to calculate residual interface strength of the rock mass basing on data from the examination of small-scale monolith samples with opposing spherical indentors. A method has been proposed to estimate strength characteristics (structural weakening coefficients and internal friction angles) of the fractured near-slope rock mass. The method relies on test data from shattering small-scale monolith samples with spherical indentors, taking into ac- count contact conditions along the weakening surface, and can be applied in the field conditions. It is acceptable to use irregular-shaped samples in thetests.

How to cite: Pavlovich A.A., Korshunov V.A., Bazhukov A.A., Melnikov N.Y. Estimation of Rock Mass Strength in Open-Pit Mining // Journal of Mining Institute. 2019. Vol. 239 . p. 502-509. DOI: 10.31897/PMI.2019.5.502
Mining
  • Date submitted
    2019-05-26
  • Date accepted
    2019-07-23
  • Date published
    2019-10-23

Ensuring Stability of Undermining Inclined Drainage Holes During Intensive Development of Multiple Gas-Bearing Coal Layers

Article preview

At high rates of production face advance, requirements towards reliable operation of undermining drainage holes get raised. The issue of maintaining high intensity of gaseous seams development under naturally increasing gas content, mining depth and capacity of production equipment poses a problem. The greatest threat comes from the loss of hole stability in the bearing pressure affected zone (in front of the face) and in the intensive shift area of overhanging rock corbels (behind the face). Intensification of air leaks due to deformation of borehole channel leads to impoverishment of removed methane-air mixture and an increasing risk to disturb safe aerogas regime in the mining area. The paper describes a mechanism of how coal-face operations affect the state of underground holes and formation of overhanging rock corbels. A typification of basic kinds of borehole deformations is presented. Authors point out critical disadvantages of the most widely-used technological schemes of gaseous seams development under high load on the production face, which hinder normal operation of a gas drainage system. As a result of research, a dependency of shot hole number, as well as the distance between shot hole axes and the borehole, on the stress state of the borehole outline has been defined more precisely. Basing on that, a formula to calculate drilling parameters of the discharge hole system has been suggested. Implementation of these measures will allow to increase the efficiency of underground gas drainage and to maintain growing intensity of gaseous coal seam development.

How to cite: Brigida V.S., Golik V.I., Dmitrak Y.V., Gabaraev O.Z. Ensuring Stability of Undermining Inclined Drainage Holes During Intensive Development of Multiple Gas-Bearing Coal Layers // Journal of Mining Institute. 2019. Vol. 239 . p. 497-501. DOI: 10.31897/PMI.2019.5.497
Geoeconomics and Management
  • Date submitted
    2019-03-21
  • Date accepted
    2019-04-30
  • Date published
    2019-08-23

Actual and Forecast Impact Assessment of Earthquakes on the Global Economic System

Article preview

Problem of strong earthquakes impact on the global economic system is considered. Geoscientists suggest that increase in Earth's seismicity is highly unlikely, but experts in economic geography say that existing facts indicate increase in seismic risk for economic systems. Using the example of an earthquake in the Tahoku region (Japan, 2011), a comprehensive assessment of economic consequences of a strong earthquake is presented as a part of analysis of three blocks of statistical information: 1) macroeconomic indicators of Japan; 2) stock market indicators; 3) industry indicators of the global economy. Results of the assessment pointed to a new feature of strong earthquakes effects in economically developed regions of the world: globalization processes are spreading regional effects of large earthquakes throughout the world economic system. To understand the magnitude of strong earthquakes problem, estimate of world economy loss from a probable earthquake near the United States, similar to Tahoku, is given. It was established that economic losses would be 2.6 times greater: a drop in the global S&P Global 1200 index would be about 15 %. The farther in time this probable earthquake protects from the Tahoku earthquake, the more globalization will increase losses.

How to cite: Skufina T.P., Baranov S.V., Samarina V.P. Actual and Forecast Impact Assessment of Earthquakes on the Global Economic System // Journal of Mining Institute. 2019. Vol. 238 . p. 465-473. DOI: 10.31897/PMI.2019.4.465
Geoeconomics and Management
  • Date submitted
    2019-01-01
  • Date accepted
    2019-03-03
  • Date published
    2019-06-25

Strategic approach to assessing economic sustainability objects of mineral resources sector of Russia

Article preview

The article gives a new definition of economic systems (ES) stability with its distinct strategic content. The main approaches to assessment of sustainability, based on the use of strategic cards, including Balanced Scorecard (BSC), are considered. Synchronous management of effectiveness, risks and chances of the ES exhausts the agenda of managing economic sustainability of ES when it operates in the face of a wide range of challenges. BSC in mineral resources sector (MRS) can be built during the aggregation of BSC by industry and individual enterprises. The use of 4 ´ 6 matrix formalism is proposed as the main tool for modeling economic sustainability of the ES.

How to cite: Nedosekin A.O., Rejshahrit E.I., Kozlovskij A.N. Strategic approach to assessing economic sustainability objects of mineral resources sector of Russia // Journal of Mining Institute. 2019. Vol. 237 . p. 354-360. DOI: 10.31897/PMI.2019.3.354
Geoeconomics and Management
  • Date submitted
    2019-01-17
  • Date accepted
    2019-03-20
  • Date published
    2019-06-25

Improving methodological approach to measures planning for hydraulic fracturing in oil fields

Article preview

Goal of the research is development of an integrated approach to the planning of hydraulic fracturing (HF) treatment taking into account geo-technical, hydrodynamic, technological and economic criteria for the selection of wells for inclusion in the programs of HF with increasing importance of economic criteria. Stages of formation of the program for HF of the oil company are selected, systematized and analyzed. It is shown that high potential effectiveness of enhanced oil recovery method in fields with hard-to-recover reserves, on the one hand, and the complexity and high cost of application, on the other, determine the need to optimize the parameters of this business process at all stages of implementation and improve its planning methods. The priority directions for improving the hydraulic fracturing planning were justified: a clear definition of the criterion for the payback period of hydraulic fracturing activities, taking into account their technological features, improving the procedure for calculating the costs of implementing this technology and improving the reasonableness of selecting candidate wells for inclusion in the hydraulic fracturing program. Feasibility of using an additional criterion in the formation of hydraulic fracturing programs – marginal minimum cost-effective wall capacity – has been shown and a method for calculating it has been developed. The use of this criterion will allow to take into account not only technological limitations, but also limits of economic efficiency of conducting hydraulic fracturing at each specific well and, at the preliminary selection of candidate wells, exclude a priori unprofitable measures.

How to cite: Burenina I.V., Avdeeva L.A., Solovjeva I.A., Khalikova M.A., Gerasimova M.V. Improving methodological approach to measures planning for hydraulic fracturing in oil fields // Journal of Mining Institute. 2019. Vol. 237 . p. 343-353. DOI: 10.31897/PMI.2019.3.343
Oil and gas
  • Date submitted
    2018-11-18
  • Date accepted
    2019-01-17
  • Date published
    2019-04-23

Calculation of elastoviscoplastic displacement of well walls in transversal and isotropic rocks

Article preview

The relevance of the work is justified by the need to improve the technical and economic indicators of well construction based on forecasting and preventing drilling tools sticking due to the narrowing of an open well bore in the intervals of transversely isotropic rocks. A mathematical model of elastic-viscous-plastic displacement of the walls of inclined and horizontal wells has been developed during the narrowing of the open borehole due to rock creep in the intervals of transversely isotropic rocks. In the program developed based on this mathematical model, the calculation of the elastic-viscous-plastic displacement of the walls of an obliquely directed and horizontal well in the reservoir of argillite from the Western Siberia deposit was carried out. As a result of the calculation, it was established that after opening the rock with bits, the cross-section of the open borehole due to the rock creep eventually takes the form of an ellipse, the small axis of which is in the plane of the upper wall of the well and decreases with time.

How to cite: Gubaidullin A.G., Moguchev A.I. Calculation of elastoviscoplastic displacement of well walls in transversal and isotropic rocks // Journal of Mining Institute. 2019. Vol. 236 . p. 180-184. DOI: 10.31897/PMI.2019.2.180
Oil and gas
  • Date submitted
    2018-11-09
  • Date accepted
    2019-01-22
  • Date published
    2019-04-23

Determining the stability of the borehole walls at drilling intervals of loosely coupled rocks considering zenith angle

Article preview

During development of drilling projects, a whole array of data is needed considering the properties of rocks and the conditions of their bedding. Accounting for geomechanical processes occurring in the near-wellbore zone allows avoiding many complications associated with the violation of the wellbore walls stability at all stages of its construction and operation. Technological and technical factors such as vibration and rotation of the drilling string, formation of launders during the descent and ascent of the assembly, pressure pulsation during the start and stop of pumps, hydrostatic and hydrodynamic pressure of the drilling fluid, its composition and properties, have a great influence on the stress-strain state of the medium opened by the well. The washing fluid circulating in the well should provide backpressure to the reservoir, not interact with the rocks chemically, colmatage channels in porous and fractured rocks, preventing penetration of the mud into the medium, by creating an impermeable barrier at drilling clay seams that are prone to swelling, cracking, etc. The article discusses the method for determining the stability of the directed well walls, taking into account the penetration of drilling mud into the pores and fractures of rocks. The technique will allow adjusting the zenith angle of the well during the workout of an unstable interval at the design stage, or selecting a drilling fluid composition to ensure fail-safe drilling.

How to cite: Blinov P.A. Determining the stability of the borehole walls at drilling intervals of loosely coupled rocks considering zenith angle // Journal of Mining Institute. 2019. Vol. 236 . p. 172-179. DOI: 10.31897/PMI.2019.2.172
Mining
  • Date submitted
    2018-01-04
  • Date accepted
    2018-03-08
  • Date published
    2018-06-22

Influence of mining-geological conditions and technogenic factors on blastholes stability during open mining of apatite-nepheline ores

Article preview

The paper presents the results of borehole stability research and considers possible causes of emergencies. The features of the blast hole drilling process are analyzed taking into account the properties of the rock. Based on the distribution of speed of drill fines removal from the well, an algorithm for selecting drilling modes is proposed. The nature of change in the size of the holess over time has been analyzed. This paper investigates the influence of rock fracturing and its water content on borehole stability. Possible options for eliminating the man-made impact on the massif near holes and options for fixing the hole walls with soft shells are suggested. The experimental data on the installation of shells for the conditions of open mining of apatite-nepheline ores are given. The operability and effectiveness of the technology is proved.

How to cite: Overchenko M.N., Tolstunov S.A., Mozer S.P. Influence of mining-geological conditions and technogenic factors on blastholes stability during open mining of apatite-nepheline ores // Journal of Mining Institute. 2018. Vol. 231 . p. 239-244. DOI: 10.25515/PMI.2018.3.239
Oil and gas
  • Date submitted
    2017-12-29
  • Date accepted
    2018-03-26
  • Date published
    2018-06-22

Methods to enhance oil recovery in the process of complex field development of the Yarega oil and titanium deposit

Article preview

Yarega oil and titanium deposit is a unique facility due to a combination of two mineral resources – oil and titanium ore – in one geologic structure. The paper describes mining and geologic conditions of the field, as well as engineering solutions to enhance oil recovery and the efficiency of heat transfer. The author focuses on the issues of deposit opening and preparation for development, and provides recommendations regarding the exploitation procedure of the oil and titanium parts of the field, which take into account field data on the extraction rates of high viscosity oil and titanium ore from the start of deposit development. The paper contains analysis of existing technological schemes of high viscosity oil extraction and steam heating of the oil bed, as well as assessment of their feasibility. Issues of field preparation for development are reviewed from the position of accumulated practical experience, and recommendations on the feasibility of combined underground and open-pit mining are supported with evidence. The main advantages of the proposed system are explained; key technical and economic indicators are calculated.

How to cite: Dolgii I.E. Methods to enhance oil recovery in the process of complex field development of the Yarega oil and titanium deposit // Journal of Mining Institute. 2018. Vol. 231 . p. 263-267. DOI: 10.25515/PMI.2018.3.263
Mining
  • Date submitted
    2016-11-01
  • Date accepted
    2017-01-20
  • Date published
    2017-04-14

Technology and economics of near-surface geothermal resources exploitation

Article preview

The paper presents economic justification for applicability of near-surface geothermal installations in Luga region, based on results of techno-economic calculations as well as integrated technical and economic comparison of different prediction scenarios of heat supply, both conventional and using geothermal heat pumps (GHP). Construction costs of a near-surface geothermal system can exceed the costs of central heating by 50-100 %. However, operation and maintenance (O&M) costs of heat production for geothermal systems are 50-70 % lower than for conventional sources of heating. Currently this technology is very important, it is applied in various countries (USA, Germany, Japan, China etc.), and depending on the region both near-surface and deep boreholes are being used. World practice of near-surface geothermal systems application is reviewed in the paper.

How to cite: Boguslavskii E.I., Fitsak V.V. Technology and economics of near-surface geothermal resources exploitation // Journal of Mining Institute. 2017. Vol. 224 . p. 189-198. DOI: 10.18454/PMI.2017.2.189