scholarly journals Substantiation of process schemes of field development taking into account technogenic conversion

2021 ◽  
pp. 5-14
Author(s):  
Artur Mazhitov
Keyword(s):  
Economic Efficiency ◽  
Natural State ◽  
Ore Deposit ◽  
Sulfide Deposits ◽  
Field Development ◽  
Ore Body ◽  
Applied Development ◽  
Geological Conditions ◽  
Induced Changes ◽  
Type Sequence

Introduction. Mining disturbs the natural state of the rock mass. Besides, the field reserves are of a different degree and nature of man-induced changes, which directly affects mining prime cost and ore marketable value. The scientific and practical relevance of the research consists in ensuring increased completeness and economic efficiency of field development by applying the development systems of different classes and taking into account the man-induced changes in reserves in mining dynamics. Research aim is to substantiate the technological schemes of mining, that take into account the possibility and feasibility of developing the reserves which have been affected by the man-induced changes, in particular when switching from one class of development systems to another. Research methods. In this research, based on the analysis of the mining and geological conditions of copper sulfide deposits, economic and mathematical modeling of developing an ore deposit by development systems of different classes was carried out, and the man-induced changes in underground reserves in the process of mining were taken into account. Results. Based on the modeling results, it was found that the increase in the economic efficiency of the deposit development is provided by justifying the type, sequence, and limits of applying different geotechnologies related to different classes of development systems within the entire deposit and a separate ore body. Conclusion. The research results can be used when designing fields in terms of selecting and substantiating the applied development systems.

scholarly journals Peculiarities of the underground mining of high-grade iron ores in anomalous geological conditions

2019 ◽  
Vol 28 (4) ◽  
pp. 706-716
Author(s):  
Mykhailo V. Petlovanyi ◽  
Vladislav V. Ruskykh
Keyword(s):  
Iron Content ◽  
Underground Mining ◽  
Hanging Wall ◽  
Slope Angle ◽  
High Grade ◽  
Ore Deposit ◽  
Ore Body ◽  
Subsequent Decrease ◽  
Geological Conditions ◽  
The Difference

This paper is dedicated to research into the geological peculiarities, shape of the ore body and the occurrence of the host rocks in the hanging wall of the Pivdenno-Biloz- erske deposit , as well as their influence on the degrees and quality of high-grade iron ore extraction. It is noted that in the interval of 480 – 840 m depths, a decrease is observed in the stability of the natural and technogenic massif, which is caused by the increase in rock pressure with depth, the influence of blast- ing operations on the massif and the difference in geological conditions. This has led to the collapse of hanging wall rocks and backfill into the mined-out space of chambers in certain areas of the deposit, the dilution of the ore and deterioration of the operational state of the underground mine workings. Attention is focused on the causes and peculiarities of consequences of the collapse of the hanging wall rocks during ore mining, which reduce the technical and-economic indexes of the ore extraction from the chambers. A 3D-model of an ore deposit with complex structural framework has been developed, which makes it possible to visually observe in axonometric projection the geological peculiarities and the shape of the ore body. The parameters have been studied of mining chambers in the 640 – 740 m floor under different changing geological conditions of the ore deposit and hanging wall rocks occurrence – the northern, central and southern parts. The difference in the iron content in the mined ore relative to the initial iron content in the massif has been defined as an indicative criterion of the influence of changing conditions on the production quality. The reasons have been revealed which contribute to the collapse of the rocks and the subsequent decrease in the iron content of the mined ore in ore deposit areas dif- fering by their characteristics. It has been determined that within the central and half of the southern ore deposit parts with a length of 600 m, an anomalous geological zone is formed, the manifestation of which will be increased with the depth of mining. It was noted that within this zone, with the highest intensity and density of collapse of hanging wall rocks, the influence of decrease in the slope angle and change in the strike direction are of greatest priority, and such geological factors as a decrease in hardness, rock morphology, deposit thickness increase this influence significantly. To solve the problems of the hanging wall rocks’ stability, it is recommended to study the nature and direction of action of gravity forces on the stope chambers in the northern, central and southern parts, as well to search for scientific solutions in regard to changes in the geometric shapes of stope chambers and their spatial location, improving the order of reserves mining in terms of the ore deposit area, the rational order of breaking-out ore reserves in the chambers with changing mining and geological conditions of the fields’ development.

scholarly journals Geomechanical justification of security measures in the development of the South Khingan deposit of manganese ore

2018 ◽  
Vol 56 ◽  
pp. 02014
Author(s):  
Maksim Rasskazov ◽  
Marina Potapchuk ◽  
Gennady Kursakin ◽  
Denis Tsoy
Keyword(s):  
Physical And Mechanical Properties ◽  
Rock Massif ◽  
Manganese Ore ◽  
Security Measures ◽  
The South ◽  
Rockburst Hazard ◽  
Field Development ◽  
Stage Of Development ◽  
Geological Conditions ◽  
Numerical Simulation Methods

The paper presents the results of geomechanical studies on the assessment of the potential rockburst hazard of the rock massif of the South Khingan deposit of manganese ore at the stage of development. Geodynamic zoning has been performed, mining and technical, mining and geological conditions of field development have been studied, and parameters of physical and mechanical properties of enclosing rocks and ores have been determined. Numerical simulation methods have been used to estimate the stress state of a rock massif at various stages of the deposit development. The tendency of the lower part of the South Khingan deposit to rockburst has been established. The complex of effective organizational and technical security measures has been substantiated in the development of this field.

Cross‐borehole delineation of a conductive ore deposit in a resistive host—experimental design

Geophysics ◽  
2001 ◽  
Vol 66 (3) ◽  
pp. 824-835 ◽  
Author(s):  
David Johnson ◽  
Elena Cherkaev ◽  
Cynthia Furse ◽  
Alan C. Tripp
Keyword(s):  
Nickel Sulfide ◽  
Sulfide Deposit ◽  
Wave Analysis ◽  
Geological Structures ◽  
Ore Deposit ◽  
Sulfide Deposits ◽  
Full Wave ◽  
Full Wave Analysis ◽  
Optimal Weighting ◽  
Difference Time

The finite‐difference time‐domain method is used for high‐resolution full‐wave analysis of cross‐borehole electromagnetic surveys of buried nickel sulfide deposits. The method is validated against analytical methods for simple cases, but is shown to be a valuable tool for analysis of complicated geological structures such as faulted or layered regions. The magnetic fields generated by a wire loop in a borehole near a nickel sulfide deposit are presented for several cases. The full‐wave solution is obtained up to 200 MHz, where quasi‐static methods would have failed. The dielectric response is included in the solution, and the diffractive nature of the field is observed. The sensitivity of each receiver in a vertical line in the cross borehole is presented and analyzed to provide an optimal weighting for receivers that can be applied to an experimental study.

scholarly journals A Typical Basalt Platform Landslide: Mechanism and Stability Prediction of Xiashan Landslide

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yongliang Huang ◽  
Zhiwei Sun ◽  
Chunyan Bao ◽  
Man Huang ◽  
Anyuan Li ◽  
...  
Keyword(s):  
Rainfall Intensity ◽  
Influencing Factor ◽  
Heavy Rain ◽  
Element Model ◽  
Maximum Tensile Stress ◽  
Natural State ◽  
Landslide Area ◽  
Rainfall Frequency ◽  
Geological Conditions ◽  
Rainfall Statistics

The Xiashan landslide, which is classified as a typical basalt platform landslide, is the most massive landslide in Zhejiang Province, China. Once sliding occurs, it will pose a severe threat to the life and property of downstream residents and the nearby section of Hangzhou-Taizhou Expressway. On the basis of the geological conditions, present situation, and latest monitoring data of the landslide, this study finds that rainfall is the main influencing factor, and the creep mode is the main prediction mode of its subsequent deformation. The rainfall statistics of the landslide area in the past 30 years show that the rainfall and rainfall frequency in the landslide area display an increasing trend. The probability of heavy rain with rainfall intensity of 100–250 mm/day in the landslide area is very high. On this basis, combined with the numerical analysis method, a finite element model of the slope considering rainfall and groundwater conditions is constructed to analyze the causes and failure mechanism of this landslide comprehensively. Results indicate that the maximum tensile stress at the top of the trailing edge under the natural state is 5.10 MPa, which is very close to the saturated tensile strength of rock mass. Thus, tensile cracks are easily generated and developed, thereby causing the failure mode to be the hydraulic driving type. Also, with the increase in rainfall intensity, the slope plastic strain increases and the slope plastic zone develops and extends until it is completely penetrated. When the rainfall intensity is more than 200 mm/day, the slope safety factor is close to unity, and the slope approaches a failure condition. Therefore, the landslide should be controlled through water treatment and integrated with engineering measures.

Recommendations for the multilateral wells design selection in various geological conditions based on lessons learned

2021 ◽  
pp. 159-167
Author(s):  
A. A. Zernin ◽  
E. S. Ziuzev ◽  
A. S. Sergeev ◽  
R. M. Khismatullin ◽  
M. A. Starikov
Keyword(s):  
Lessons Learned ◽  
Energy Conditions ◽  
Reservoir Properties ◽  
Field Development ◽  
Well Design ◽  
Well Efficiency ◽  
Geological Conditions ◽  
Efficiency Estimation ◽  
Design Selection ◽  
First Time

The authors of the article have summarized the experience of multilateral well application, performed an efficiency analysis of multilateral wells vs horizontal wells in Rosneft Oil Company's fields with various subsurface architecture. The algorithm for multilateral well efficiency estimation, compared to other type of well completions, was developed. This algorithm is based on the selection of areas for well locations with similar reservoir properties, reservoir energy conditions, and reservoir development conditions to evaluate production startup parameters, decline rates, cumulative parameters for the areas of over 6 month production. A matrix of multilateral well applicability in various geological conditions was generated, and recommendations for preferable well design were made. This type of analysis was conducted for the first time due to collection of sufficient statistical data, because of a multiple increase in the amount of drilling complex wells in the recent years. The obtained results provide an opportunity to design an efficient field development system for new assets, perform an adjustment of brownfields development systems, select multilateral well design for certain geological conditions based on lessons learned.

Artificial Lift Optimization for Shallow Carbonate Magwa and Ostracod Formations with Massive Propped Fractures

2021 ◽  
Author(s):  
Nasser AlAskari ◽  
Muhamad Zaki ◽  
Ahmed AlJanahi ◽  
Hamed AlGhadhban ◽  
Eyad Ali ◽  
...  
Keyword(s):  
Production Performance ◽  
Shallow Depth ◽  
Production Rates ◽  
Field Development ◽  
Artificial Lift ◽  
Geological Conditions ◽  
Fracture Fluid ◽  
Reservoir Potential ◽  
Gas Lift

Abstract Objectives/Scope: The Magwa and Ostracod formations are tight and highly fractured carbonate reservoirs. At shallow depth (1600-1800 ft) and low stresses, wide, long and conductive propped fracture has proven to be the most effective stimulation technique for production enhancement. However, optimizing flow of the medium viscosity oil (17-27 API gravity) was a challenge both at initial phase (fracture fluid recovery and proppant flowback risks) and long-term (depletion, increasing water cut, emulsion tendency). Methods, Procedures, Process: Historically, due to shallow depth, low reservoir pressure and low GOR, the optimum artificial lift method for the wells completed in the Magwa and Ostracod reservoirs was always sucker-rod pumps (SRP) with more than 300 wells completed to date. In 2019 a pilot re-development project was initiated to unlock reservoir potential and enhance productivity by introducing a massive high-volume propped fracturing stimulation that increased production rates by several folds. Consequently, initial production rates and drawdown had to be modelled to ensure proppant pack stability. Long-term artificial lift (AL) design was optimized using developed workflow based on reservoir modelling, available post-fracturing well testing data and production history match. Results, Observations, Conclusions: Initial production results, in 16 vertical and slanted wells, were encouraging with an average 90 days production 4 to 8 times higher than of existing wells. However, the initial high gas volume and pressure is not favourable for SRP. In order to manage this, flexible AL approach was taken. Gas lift was preferred in the beginning and once the production falls below pre-defined PI and GOR, a conversion to SRP was done. Gas lift proved advantageous in handling solids such as residual proppant and in making sure that the well is free of solids before installing the pump. Continuous gas lift regime adjustments were taken to maximize drawdown. Periodical FBHP surveys were performed to calibrate the single well model for nodal analysis. However, there limitations were present in terms of maximizing the drawdown on one side and the high potential of forming GL induced emulsion on the other side. Horizontal wells with multi-stage fracturing are common field development method for such tight formations. However, in geological conditions of shallow and low temperature environment it represented a significant challenge to achieve fast and sufficient fracture fluid recovery by volume from multiple fractures without deteriorating the proppant pack stability. This paper outlines local solutions and a tailored workflow that were taken to optimize the production performance and give the brown field a second chance. Novel/Additive Information: Overcoming the different production challenges through AL is one of the keys to unlock the reservoir potential for full field re-development. The Magwa and Ostracod formations are unique for stimulation applications for shallow depth and range of reservoirs and fracture related uncertainties. An agile and flexible approach to AL allowed achieving the full technical potential of the wells and converted the project to a field development phase. The lessons learnt and resulting workflow demonstrate significant value in growing AL projects in tight and shallow formations globally.

scholarly journals The choice of mining development strategy based on the improved Bayes criterion

2020 ◽  
Vol 168 ◽  
pp. 00053
Author(s):  
Yevhen Lapshin ◽  
Borys Blyuss ◽  
Serhii Dziuba ◽  
Larysa Tatarko
Keyword(s):  
Decision Making ◽  
Initial Data ◽  
Development Strategy ◽  
Economic Efficiency ◽  
Development Strategies ◽  
Mineral Deposits ◽  
Mining Operations ◽  
Acceptable Range ◽  
Geological Conditions

The choice of mining development strategies is based on the main indicators of mining and geological conditions that characterize mineral deposits. The purpose of the research is to argue the application of the improved Bayes criterion when choosing rational mining development strategies by taking into account the complex mining and geological conditions. The methodology of decision-making in terms of managing geotechnical systems depends on whether or not the probabilities of the conditions and dynamics of the parameters of rocks and soils are known during the development of mineral deposits, as well as the construction of infrastructure facilities. If the probabilities are unknown, then there is the problem of making decisions in the conditions of uncertainty of the initial data to assess the efficiency of the mining enterprises. And if the probabilities are known, then we are dealing with the task of making decisions in conditions of risk and assess the safety of mining operations. The improvement of the Bayes criterion enables us to determine, with an acceptable range of changes in efficiency, a strategy which provides more likely an increase in economic efficiency compared to a strategy selected using the traditional Bayes criterion.

The Mechanism of Ensuring Ecological and Economic Efficiency of the Iron-Ore Deposit Exploitation

2017 ◽  
Vol 22 ◽  
pp. 128-134
Author(s):  
Vasiliy Prokopenko ◽  
Olexandra Tymoshenko
Keyword(s):  
Economic Efficiency ◽  
Iron Ore ◽  
Raw Materials ◽  
Low Grade ◽  
Investment Funds ◽  
Ore Deposit ◽  
Mining Enterprise ◽  
Fixed Assets ◽  
Industrial Complexes ◽  
Iron Ore Deposit

Components of constantly renewed cycle of formation the investment on maintaining of productivity fixed assets of production and a mechanism of ensuring the environmental and economic efficiency during exploitation of iron ore deposit is substantiated. The methodic fundamentals in investing of expanded reproduction of fixed assets on the mining enterprise for increasing the completeness of using the operational stocks of ore raw materials have been developed. The possibility and advisability of investing in reproduction of fixed assets due to additional revenue from the sale of products made from rich ore are proved, which creates a profitable conditions for processing low-grade ore stocks. It is achieved through the expanded reproduction of fixed assets, that is able to maintain the pit capacity depending on the degree and time of its deepening. On the example of Poltava MPP it is estimated the possibility of industrial complexes to accumulate profits from operations for the extended reproduction of fixed assets. It is proved that the plant will be able to allocate the necessary investment funds if mineral ore reserves is processed with a reduction of its quality.

Sandaozhuang Open-Pit Quality Block Modeling Based on Engineering Geological Profile

2014 ◽  
Vol 962-965 ◽  
pp. 959-963
Author(s):  
Ying Sun ◽  
Shu Ai Ma ◽  
Lang Huang ◽  
Huan Ming Zhou ◽  
Dong Tao Hu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Boundary Curve ◽  
Open Pit ◽  
Quality Model ◽  
Block Model ◽  
Body Contour ◽  
Ore Deposit ◽  
Model Based ◽  
Ore Body ◽  
Contour Model

Block model is the precondition of open-p it mine o ptimization boundary design and mining design. In this paper , after studying the ore deposit model that using the optimization boundary, p ut forward to establish ore deposit quality block model based on the proposed Sandaozhuang engineering geological profile . Using prospecting line profile CAD drawings that o btained during the exploration phase, us e two-dimensional coordinate conversion three-dimensional coordinates, the profile boundary curve smoothing, apply D elaunay triangulation and other technology to establish ore body contour model. Establish the ore body quality model based on the ore body contour model, use i nverse distance weighted method in geostatistics for the assignment of ore body quality model, get the Sandaozhuang open pit quality block model. And ba sed on this to estimate the reserves , lay the foundation for the follow work of the mine.

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