Vol 253
- Vol 271
- Vol 270
- Vol 269
- Vol 268
- Vol 267
- Vol 266
- Vol 265
- Vol 264
- Vol 263
- Vol 262
- Vol 261
- Vol 260
- Vol 259
- Vol 258
- Vol 257
- Vol 256
- Vol 255
- Vol 254
- Vol 253
- Vol 252
- Vol 251
- Vol 250
- Vol 249
- Vol 248
- Vol 247
- Vol 246
- Vol 245
- Vol 244
- Vol 243
- Vol 242
- Vol 241
- Vol 240
- Vol 239
- Vol 238
- Vol 237
- Vol 236
- Vol 235
- Vol 234
- Vol 233
- Vol 232
- Vol 231
- Vol 230
- Vol 229
- Vol 228
- Vol 227
- Vol 226
- Vol 225
- Vol 224
- Vol 223
- Vol 222
- Vol 221
- Vol 220
- Vol 219
- Vol 218
- Vol 217
- Vol 216
- Vol 215
- Vol 214
- Vol 213
- Vol 212
- Vol 211
- Vol 210
- Vol 209
- Vol 208
- Vol 207
- Vol 206
- Vol 205
- Vol 204
- Vol 203
- Vol 202
- Vol 201
- Vol 200
- Vol 199
- Vol 198
- Vol 197
- Vol 196
- Vol 195
- Vol 194
- Vol 193
- Vol 191
- Vol 190
- Vol 192
- Vol 189
- Vol 188
- Vol 187
- Vol 185
- Vol 186
- Vol 184
- Vol 183
- Vol 182
- Vol 181
- Vol 180
- Vol 179
- Vol 178
- Vol 177
- Vol 176
- Vol 174
- Vol 175
- Vol 173
- Vol 172
- Vol 171
- Vol 170 No 2
- Vol 170 No 1
- Vol 169
- Vol 168
- Vol 167 No 2
- Vol 167 No 1
- Vol 166
- Vol 165
- Vol 164
- Vol 163
- Vol 162
- Vol 161
- Vol 160 No 2
- Vol 160 No 1
- Vol 159 No 2
- Vol 159 No 1
- Vol 158
- Vol 157
- Vol 156
- Vol 155 No 2
- Vol 154
- Vol 153
- Vol 155 No 1
- Vol 152
- Vol 151
- Vol 150 No 2
- Vol 150 No 1
- Vol 149
- Vol 147
- Vol 146
- Vol 148 No 2
- Vol 148 No 1
- Vol 145
- Vol 144
- Vol 143
- Vol 140
- Vol 142
- Vol 141
- Vol 139
- Vol 138
- Vol 137
- Vol 136
- Vol 135
- Vol 124
- Vol 130
- Vol 134
- Vol 133
- Vol 132
- Vol 131
- Vol 129
- Vol 128
- Vol 127
- Vol 125
- Vol 126
- Vol 123
- Vol 122
- Vol 121
- Vol 120
- Vol 118
- Vol 119
- Vol 116
- Vol 117
- Vol 115
- Vol 113
- Vol 114
- Vol 112
- Vol 111
- Vol 110
- Vol 107
- Vol 108
- Vol 109
- Vol 105
- Vol 106
- Vol 103
- Vol 104
- Vol 102
- Vol 99
- Vol 101
- Vol 100
- Vol 98
- Vol 97
- Vol 95
- Vol 93
- Vol 94
- Vol 91
- Vol 92
- Vol 85
- Vol 89
- Vol 87
- Vol 86
- Vol 88
- Vol 90
- Vol 83
- Vol 82
- Vol 80
- Vol 84
- Vol 81
- Vol 79
- Vol 78
- Vol 77
- Vol 76
- Vol 75
- Vol 73 No 2
- Vol 74 No 2
- Vol 72 No 2
- Vol 71 No 2
- Vol 70 No 2
- Vol 69 No 2
- Vol 70 No 1
- Vol 56 No 3
- Vol 55 No 3
- Vol 68 No 2
- Vol 69 No 1
- Vol 68 No 1
- Vol 67 No 1
- Vol 52 No 3
- Vol 67 No 2
- Vol 66 No 2
- Vol 64 No 2
- Vol 64 No 1
- Vol 54 No 3
- Vol 65 No 2
- Vol 66 No 1
- Vol 65 No 1
- Vol 53 No 3
- Vol 63 No 1
- Vol 61 No 1
- Vol 62 No 1
- Vol 63 No 2
- Vol 62 No 2
- Vol 61 No 2
- Vol 59 No 2
- Vol 60 No 2
- Vol 51 No 3
- Vol 60 No 1
- Vol 49 No 3
- Vol 50 No 3
- Vol 59 No 1
- Vol 57 No 2
- Vol 58 No 2
- Vol 58 No 1
- Vol 56 No 2
- Vol 57 No 1
- Vol 55 No 2
- Vol 48 No 3
- Vol 56 No 1
- Vol 47 No 3
- Vol 55 No 1
- Vol 54 No 2
- Vol 53 No 2
- Vol 54 No 1
- Vol 52 No 2
- Vol 46 No 3
- Vol 53 No 1
- Vol 52 No 1
- Vol 51 No 2
- Vol 51 No 1
- Vol 50 No 2
- Vol 49 No 2
- Vol 48 No 2
- Vol 50 No 1
- Vol 49 No 1
- Vol 45 No 3
- Vol 47 No 2
- Vol 44 No 3
- Vol 43 No 3
- Vol 42 No 3
- Vol 48 No 1
- Vol 46 No 2
- Vol 45 No 2
- Vol 46 No 1
- Vol 47 No 1
- Vol 44 No 2
- Vol 43 No 2
- Vol 41 No 3
- Vol 42 No 2
- Vol 39 No 3
- Vol 37 No 3
- Vol 45 No 1
- Vol 41 No 2
- Vol 39 No 2
- Vol 44 No 1
- Vol 38 No 2
- Vol 37 No 2
- Vol 38 No 3
- Vol 43 No 1
- Vol 42 No 1
- Vol 41 No 1
- Vol 40
- Vol 39 No 1
- Vol 36 No 2
- Vol 35 No 2
- Vol 38 No 1
- Vol 35 No 3
- Vol 34 No 2
- Vol 34 No 3
- Vol 33 No 2
- Vol 36 No 1
- Vol 37 No 1
- Vol 36 No 3
- Vol 35 No 1
- Vol 34 No 1
- Vol 32 No 3
- Vol 33 No 3
- Vol 32 No 2
- Vol 33 No 1
- Vol 31
- Vol 30 No 3
- Vol 30 No 2
- Vol 30 No 1
- Vol 32 No 1
- Vol 29 No 3
- Vol 29 No 1
- Vol 29 No 2
- Vol 28
- Vol 27 No 1
- Vol 27 No 2
- Vol 26 No 2
- Vol 26 No 1
- Vol 25 No 2
- Vol 25 No 1
- Vol 23
- Vol 24
- Vol 15 No 16
- Vol 22
- Vol 20
- Vol 17 No 18
- Vol 21
- Vol 19
- Vol 13 No 3
- Vol 14
- Vol 13 No 2
- Vol 12 No 3
- Vol 12 No 2
- Vol 13 No 1
- Vol 12 No 1
- Vol 11 No 3
- Vol 11 No 2
- Vol 10 No 3
- Vol 10 No 2
- Vol 11 No 1
- Vol 9 No 2
- Vol 10 No 1
- Vol 9 No 1
- Vol 8
- Vol 7 No 3
- Vol 7 No 2
- Vol 7 No 1
- Vol 6 No 2
- Vol 6 No 1
- Vol 5 No 4-5
- Vol 5 No 2-3
- Vol 5 No 1
- Vol 4 No 5
- Vol 4 No 4
- Vol 4 No 3
- Vol 4 No 2
- Vol 3
- Vol 4 No 1
- Vol 2 No 5
- Vol 2 No 4
- Vol 2 No 3
- Vol 2 No 1
- Vol 2 No 2
- Vol 1 No 5
- Vol 1 No 4
- Vol 1 No 3
- Vol 1 No 2
- Vol 1 No 1
-
Date submitted2021-10-14
-
Date accepted2022-01-24
-
Date published2022-04-29
Monitoring of compressed air losses in branched air flow networks of mining enterprises
Compressed air as a type of safe technological energy carrier is widely used in many industries. In economically developed countries energy costs for the production and distribution of compressed air reach 10 % of the total energy costs. The analysis of compressed air production and distribution systems in the industrial sector shows that the efficiency of the systems is at a relatively low level. This is due to the fact that insufficient attention is paid to these systems since the compressed air systems energy monitoring has certain difficulties – the presence of complex and branched air pipeline networks with unique characteristics; low sensitivity of the equipment which consumes compressed air; the complexity of auditing pneumatic equipment that is in constant operation. The article analyzes the options for reducing the cost of production and compressed air distribution. One of the promising ways to reduce the compressed air distribution cost is timely detection and elimination of leaks that occur in the external air supply network of the enterprise. The task is solved by hardware-software monitoring of compressed air pressure at key points in the network. The proposed method allows real-time detecting of emerging air leaks in the air duct network and sending commands to maintenance personnel for their timely localization. This technique was tested in the industrial conditions of ALROSA enterprises on the air pipeline network of the Mir mine of the Mirninsky Mining and Processing Plant and showed satisfactory convergence of the calculated leakage values with the actual ones. The practical significance of the obtained results is that the developed method for monitoring air leaks in the air duct network is simple, it requires an uncomplicated software implementation and allows to localize leaks in a timely manner, thereby reducing unproductive energy costs at the enterprises.
-
Date submitted2021-10-18
-
Date accepted2022-01-24
-
Date published2022-04-29
Development of a hydrocarbon completion system for wells with low bottomhole temperatures for conditions of oil and gas fields in Eastern Siberia
The paper presents the results of investigations on the influence of low bottomhole temperatures in the intervals of productive formations on the technological properties of solutions used for drilling and completion of wells in order to determine the possibility of increasing gas recovery coefficient at the field of the “Sila Sibiri” gas pipeline. The analysis of technological measures determining the quality of the productive horizon drilling-in was carried out. It was found out that the dispersion of bridging agent in the composition of the hydrocarbon-based drilling mud selected from the existing methods does not have significant influence on the change in the depth of filtrate penetration into the formation in conditions of low bottomhole temperatures. The main reason for the decrease in the near-bottomhole zone permeability was found out – the increase in plastic viscosity of the dispersion medium of the hydrocarbon-based drilling mud under the influence of low bottomhole temperatures. A destructor solution for efficient wellbore cleaning from hydrocarbon-based solution components in conditions of low bottomhole temperatures was developed. The paper presents the results of laboratory investigations of hydrocarbon-based drilling mud and the developed destructor solution, as well as its pilot field tests. The mechanism of interaction between the destructor solution and the filter cake of the hydrocarbon-based drilling mud ensuring the reduction of the skin factor in the conditions of the geological and hydrodynamic structure of Botuobinsky, Khamakinsky and Talakhsky horizons of the Chayandinskoye oil and gas condensate field has been scientifically substantiated.
-
Date submitted2021-09-22
-
Date accepted2022-03-24
-
Date published2022-04-29
Predicting dynamic formation pressure using artificial intelligence methods
Determining formation pressure in the well extraction zones is a key task in monitoring the development of hydrocarbon fields. Direct measurements of formation pressure require prolonged well shutdowns, resulting in underproduction and the possibility of technical problems with the subsequent start-up of wells. The impossibility of simultaneous shutdown of all wells of the pool makes it difficult to assess the real energy state of the deposit. This article presents research aimed at developing an indirect method for determining the formation pressure without shutting down the wells for investigation, which enables to determine its value at any time. As a mathematical basis, two artificial intelligence methods are used – multidimensional regression analysis and a neural network. The technique based on the construction of multiple regression equations shows sufficient performance, but high sensitivity to the input data. This technique enables to study the process of formation pressure establishment during different periods of deposit development. Its application is expedient in case of regular actual determinations of indicators used as input data. The technique based on the artificial neural network enables to reliably determine formation pressure even with a minimal set of input data and is implemented as a specially designed software product. The relevant task of continuing the research is to evaluate promising prognostic features of artificial intelligence methods for assessing the energy state of deposits in hydrocarbon extraction zones.
-
Date submitted2021-03-23
-
Date accepted2022-01-24
-
Date published2022-04-29
Justification of the technological scheme parameters for the development of flooded deposits of construction sand
- Authors:
- Vladimir V. Ivanov
- Denis O. Dzyurich
The article describes the main types of technological schemes for working out the flooded strata of sand deposits using hydraulic shovel excavators. The analysis of scientific and technical literature describing the experience of using hydraulic shovel excavators in the open-pit mining, including pits for the extraction of construction sand, has been carried out. The proposed technological scheme is that the development of reserves of the flooded strata without preliminary water reduction is carried out by a hydraulic shovel excavator from under water by a downward digging with the storage of the extracted rock mass in bulk (for dewatering), placed in such a way that when working out the next mining bench width, it is located within the working area of the excavator for simultaneous processing of the next bench width and loading of dewatered sand from the pile. Calculations of the parameters of the operating platform and the excavator block of the proposed technological scheme for conducting open-pit mining were carried out. The dependence for determining the minimum length of the mining operations front of an excavator for drawing up a technological scheme of operation of a backhoe hydraulic excavator on working out the flooded strata with the pile formation for dewatering sand and its subsequent uploading from the pile by the same excavator is presented.
-
Date submitted2021-07-05
-
Date accepted2022-01-24
-
Date published2022-04-29
Ensuring the excavation workings stability when developing excavation sites of flat-lying coal seams by three workings
- Authors:
- Oleg I. Kazanin
- Andrei A. Ilinets
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.
-
Date submitted2021-10-08
-
Date accepted2022-01-24
-
Date published2022-04-29
Methodology for thermal desorption treatment of local soil pollution by oil products at the facilities of the mineral resource industry
- Authors:
- Mariya A. Pashkevich
- Marina V. Bykova
The analysis of the main environmental consequences of leaks and local spills of petroleum products at the enterprises of the mineral resource complex is presented. It is established that the problem of soil contamination with petroleum products at the facilities of the mineral resource complex and enterprises of other industries is caused by significant volumes of consumption of the main types of oil products. Based on the results of the author's previous field research, a series of experiments was carried out, consisting in modeling artificial soil pollution with petroleum products such as gasoline, diesel fuel, highly refined oil, motor oil, and transmission oil, followed by their purification by heat treatment at temperatures of 150, 200, and 250 °C. The 250 °C limit of the heating temperature was set due to the need to partially preserve the structure and quality of the soil after heat treatment to preserve its fertility. When the processing temperature rises to 450 °C, all humates are completely burned out and, as a result, productivity is lost. Confirmation is provided by the results of experiments to determine the humus content in uncontaminated soil and soil treated at different temperatures. It was found that at a maximum processing temperature of 250 °C, about 50 % of the initial organic carbon content is preserved. According to the results of the conducted experimental studies, the dependences of the required processing temperature on the concentration of petroleum products to reduce the concentration of petroleum products to an acceptable level have been established. The methodology of thermal desorption cleaning of soils with varying degrees of contamination at enterprises of the mineral resource complex is presented.
-
Date submitted2021-10-27
-
Date accepted2022-01-24
-
Date published2022-04-29
Prediction of the geomechanical state of the rock mass when mining salt deposits with stowing
The technogenic impact of mining on the environment is analyzed and the transition to geotechnology with stowing to reduce the impact of mining operations is proposed. The results of the research work devoted to the justification of parameters of the development of salt deposits with stowing and the definition of the influence of stowing on the dynamics of deformation of the underworked rock massif are presented. The relevance of research aimed at creating a safe and efficient technology for the transition from systems with natural maintenance of stoping space to systems with stowing has been substantiated. The results of studies on qualitative and quantitative assessment of the state of the rock massif (by the finite element method using FLAC3D software), worked out by combines, are given and the dynamics of the impact of mining operations on the rock mass and the change in the maximum stresses during the hardening of the stowing in the chambers are revealed. The numerical modeling method is used to analyze the conditions of change in the state of the underworked rock mass, to establish the mechanisms of its deformation at various stages of development. It is recommended to use this approach for geotechnical assessment of the rock mass state in conditions of using development systems of different classes.
-
Date submitted2021-05-19
-
Date accepted2022-04-07
-
Date published2022-04-29
On the possibility of reducing man-made burden on benthic biotic communities when mining solid minerals using technical means of various designs
The paper analyses features of the species composition and diversity of biotic communities living within the ferromanganese nodule fields (the Clarion-Clipperton field), cobalt-manganese crusts (the Magellan Seamounts) and deep-sea polymetallic sulphides (the Ashadze-1, Ashadze-2, Logatchev and Krasnov fields) in the Russian exploration areas of the Pacific and Atlantic Oceans. Prospects of mining solid minerals of the world’s oceans with the least possible damage to the marine ecosystems are considered that cover formation of the sediment plumes and roiling of significant volumes of water as a result of collecting the minerals as well as conservation of the hydrothermal fauna and microbiota, including in the impact zone of high temperature hydrothermal vents. Different concepts and layout options for deep-water mining complexes (the Indian and Japanese concepts as well as those of the Nautilus Minerals and Saint Petersburg Mining University) are examined with respect to their operational efficiency. The main types of mechanisms that are part of the complexes are identified and assessed based on the defined priorities that include the ecological aspect, i.e. the impact on the seabed environment; manufacturing and operating costs; and specific energy consumption, i.e. the technical and economic indicators. The presented morphological analysis gave grounds to justify the layout of a deep-sea minerals collecting unit, i.e. a device with suction chambers and a grip arm walking gear, selected based on the environmental key priority. Pilot experimental studies of physical and mechanical properties of cobalt-manganese crust samples were performed through application of bilateral axial force using spherical balls (indenters) and producing a rock strength passport to assess further results of the experimental studies. Experimental destructive tests of the cobalt-manganese crust by impact and cutting were carried out to determine the impact load and axial cutting force required for implementation of the collecting system that uses a clamshell-type effector with a built-in impactor.
-
Date submitted2021-09-02
-
Date accepted2022-01-24
-
Date published2022-04-29
Complex processing of high-carbon ash and slag waste
The paper considers a current issue of ash and slag processing for the Polyus Aldan JSC, that has accumulated over 1 million tons of this waste. Following the results of the review of Russian and foreign literature, four promising areas of their use were selected: road construction, building materials, reclamation of disturbed lands, and inert aggregates. To assess the possibility of implementing the selected disposal directions, the samples of ash and slag waste of the enterprise were sampled and analyzed. Fuel characteristics, chemical and mineral composition, as well as physico-chemical and mechanical properties of waste were determined. Taking into account the results of complex laboratory studies and the requirements of regulatory documents, each of the selected areas of using ash and slag waste was evaluated. It was found that their disposal by traditional methods has limitations, mainly related to the high content of unburned fuel residues. The high content of combustible substances and the high specific heat of combustion with a relatively low ash content suggested the possibility of thermal disposal of the studied waste. Based on the literature data, the characteristics of the preparation of organic coal-water suspensions based on the studied ash and slag waste were selected. As a result of a series of experiments on their flaring, the expediency of using the obtained fuel at the enterprise under consideration has been proved. The authors note the possibility of using ash obtained after thermal waste disposal in the road construction industry. The prospects for further research of technologies for the preparation and combustion modes of suspension fuel based on ash and slag waste are determined.
-
Date submitted2021-09-16
-
Date accepted2022-02-24
-
Date published2022-04-29
Production of microfluidic chips from polydimethylsiloxane with a milled channeled surface for modeling oil recovery during porous rock waterflooding
Microfluidic chips with porous structures are used to study the flow of oil-containing emulsion in the rock. Such chips can be made from polydimethylsiloxane by casting into a master mold. At the initial stages of research, fast and cheap prototyping of a large number of different master molds is often required. It is proposed to use milling to make a channeled surface on a polymethyl methacrylate plate, from which a negative image should be taken, which is the master mold for casting positive polydimethylsiloxane chips in it. Several epoxy compositions have been tested to make this master mold. The main requirement in the search for the material was the exact replication of the geometry and sufficiently low adhesion to polymethyl methacrylate and polydimethylsiloxane for removing the product with minimal damage to the mold. It was possible to make master molds from all the materials used, but with defects and various degrees of damage. One of the epoxy compositions was found suitable for making a master mold with many elements simulating the grains of a porous medium (height to width ratio 2:3). The developed method makes it possible to use polydimethylsiloxane for prototyping chips simulating the porous structure of an oil rock.
-
Date submitted2021-10-14
-
Date accepted2022-04-07
-
Date published2022-04-29
The influence of the shape and size of dust fractions on their distribution and accumulation in mine workings when changing the structure of air flow
The results of the analysis of statistical data on accidents at Russian mines caused by explosions in the workings space have shown that explosions of methane-dust-air mixtures at underground coal mines are the most severe accidents in terms of consequences. A detailed analysis of literature sources showed that in the total number of explosions prevails total share of hybrid mixtures, i.e. with the simultaneous participation of gas (methane) and coal dust, as well as explosions with the possible or partial involvement of coal dust. The main causes contributing to the occurrence and development of dust-air mixture explosions, including irregular monitoring of by mine engineers and technicians of the schedule of dust explosion protective measures; unreliable assessment of the dust situation, etc., are given. The main problem in this case was the difficulty of determining the location and volume of dust deposition zones in not extinguished and difficult to access for instrumental control workings. Determination of the class-shape of coal dust particles is a necessary condition for constructing a model of the dust situation reflecting the aerosol distribution in the workings space. The morphological composition of coal mine dust fractions with dispersion less than 0.1 has been studied. Particle studies conducted using an LEICA DM 4000 optical microscope and IMAGE SCOPE M software made it possible to establish the different class-shapes of dust particles found in operating mines. It was found that the coal dust particles presented in the samples correspond to the parallelepiped shape to the greatest extent. The mathematical model based on the specialized ANSYS FLUENT complex, in which this class-form is incorporated, is used for predicting the distribution of explosive and combustible coal dust in the workings space. The use of the obtained model in production conditions will allow to determine the possible places of dust deposition and to develop measures to prevent the transition of coal dust from the aerogel state to the aerosol state and thereby prevent the formation of an explosive dust-air mixture.
-
Date submitted2021-03-11
-
Date accepted2021-04-12
-
Date published2022-04-29
Operation mode selection algorithm development of a wind-diesel power plant supply complex
- Authors:
- Yaroslav E. Shklyarskiy
- Daria E. Batueva
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.