Abstract: Low-temperature highly icy frozen rocks (up to minus 7.0°C) and productive formations with temperatures up to 55.0°C under high temperature gradient values (3.3°C/100 m) and small depth, in Bovanenkovo oil-gas condensate field, create conditions for heat transfer from the reservoir to the wellhead with subsequent impact on the surrounding permafrost, including their warming and hydrate plugs dehydration with the annular gas showings. For such conditions, wells are needed, equipped according to the packer scheme, with the placement of non-freezing packer fluid in the packer annulus, which provides thermal convection of heat transfer from the formation to the permafrost zone, preventing their thawing and crushing of production strings. To ensure the safe operation of wells in the Bovanenkovo oil-gas condensate field, the most suitable packer fluids are those based on sodium format.
Keywords: Research, packer fluid, saline solutions, permafrost
Abstract: In order to identify the productive and perspective perforation in the deposits with scavenger reserves, one often faces a number of problems that prevent the selection of the most perspective intervals. One can add to these intervals the misinterpretation of geophysical well logging, as a result of drill mud colmatation into the formation or technogenic disturbances in the core of rocks that occur during lifting, sample preparation and analysis by classical petrophysical methods. In this regard, the authors of this article present a method of computer x-ray microtomography in order to develop criteria for the prospects of intervals in deposits with scavenger reserves. The article underlines the prospects of the computer xray microtomography method: 3D modelling, calculation of porosity and clay coefficients, volume fraction of heavy minerals, estimation of pore distribution by size and depth of drilling mud penetration of the core, as well as experimental output with recommendations for the usage of method during experiments before and after any impact. In accordance with the research results, we concluded that the method of computer x-ray microtomography under the study of core material can help in the development of effective criteria in order to identify the promising intervals for perforation in the section of a well with deposits with scavenger reserves of hydrocarbon. One can do this if there is a sufficient test and information sampling in relation to the test results under study.
Keywords: The scavenger reserves of hydrocarbon, computer x-ray microtomography, interval prospect criteria, drill mud colmatation, modelling of hydrocarbon generation, SkyScan 1172.Read more
Abstract: In connection with the high level of oil production and the decrease in the debits of wells, the intensification of oil production for the fields entering the second and third operating stages is an actual phenomenon. The first stage of development of oil fields is associated with the use of natural energy of the ground. It is known that at the first stage of development, new deposits do not require intensification, and the extraction of carbohygens is carried out at the expense of the layer’s own energy – the energy of the dissolved gas, the water supply, the gas cap and the potential energy of the gravitational force. In the second stage of development of the fields, the second methods of intensification of production are used, which include the pumping of water and gas to maintain the level of sludge. The third stage of development of deposits requires the application of methods of increasing oil production or third methods of intensive production, which are classified according to the types of working agents. The classification of oil production and proceeding enterprises (OPPE), according to working agents is classified as follows. Each of the existing methods of oil refining allows the extraction of oil at a certain level from the ground alone.
Keywords: Economic, efficiency, intensification, quality, planningRead more
Abstract: Identification of sources of air pollutants plays a predominant role in coal-based anthropogenic activities to manage the air quality. Coal mining and thermal power plants (TPPs) are two multi-activity-centred coal-based sources that affect the ambient air quality of the region. Among five air pollutants under consideration, the annual average concentration of PM10 and PM2.5 exceeded the Indian Central Pollution Control Board (CPCB) prescribed annual standard limit, and the probability of exceedance of daily average concentration for PM10 was 80.3% and that of PM2.5 was 60.7%. Therefore, in this paper, pollutants’ mass concentration data has been used to quantify the proportionate contribution of the sources using Positive Matrix Factorization (PMF) analysis for five pollutants. In addition, correlation analysis and literature survey has been used to designate the sources. The PMF analysis revealed that 74.4% of PM10 are emitted from coal mining and its allied activities, and 25.6% by TPP; whereas TPPs contribute 57.6% of PM2.5 emission and 42.4% is by coal mining and its allied activities. Source apportionment of pollutants can help policy-makers and company management to devise suitable short-term as well as long-term emission control measures to manage particulate pollutants.
Keywords: Source apportionment; air pollutants; positive matrix factorization; coal mine; thermal power plants.Read more
Abstract: A new approach is presented for studying the patterns of structural changes in reservoirs in the process of volumetric strains of a producing solid mass during its compression (behaviour in tension) strain according to the identified lithological types limited to sedimentary rocks of Western Siberia. Object: The purpose of this study is to develop analytical expressions in the study of volumetric strain of reservoir rocks (the beginning of dilatancy) in accordance with the individual breakdown point of lithological types of the producing solid mass during its compression (behaviour in tension) strain Methods: The mathematical methods used in this scientific work are presented by the probability theory, and the geo-mechanical features of sedimentary rocks are studied on the basis of the kinetic theory of solids destruction. Findings: Individual patterns of changes have been revealed in the reservoirs breakdown point during the transition from low-permeability to medium- and high permeability. The time of the initial development of volumetric strains (the beginning of dilatancy) in sand shale reservoirs is calculated. Conclusions: The obtained patterns indicate the fact that low-permeability, medium-permeability and high permeability rocks should be considered separately when studying the work of the pay zone on tension (this geo-mechanical process will be characteristic of the production wells operation) and on compression (this geo-mechanical process will be characteristic of the injection wells operation).
Keywords: Strain: Eigenpolarization parameter; sand shale reservoir; producing solid mass; compression and tension of the solid mass; permeability.Read more
Abstract: At present, the research on enterprise performance of domestic and abroad mainly focuses on the enterprise’s operating efficiency. The research based on environmental costs assessment of enterprise performance, especially the measurement method, is still lacking. In this paper, the environmental costs of the coal industry enterprises are divided according to the life cycle of the production and operation, and the performance of enterprises is studied from different dimensions. DEA (data envelopment analysis) analysis is used in this paper to analyze the impact of enterprise environmental costs on enterprise performance and their evaluation.
Keywords: Environmental costs, enterprise performance, DEA model.Read more
Abstract: The purpose of the paper is to find the difference between in managing a single project and that of a multiproject. What are the focus and requirements of organization in the multi-project? Where are the links to organization objectives? Further the aim is to provide a organizational methodology for the risk management in multi-project environment. Design/methodology/approach: The concept and structure described in the paper have emerged predominant from an in-depth action research study in the most biggest real estate project in Asia which is Hua Guoyuan project in Guiyang. Finding: The paper provides that the proposed organizational methodology would manage multi-project risk in three-dimensional structuring system. The threedimensional structuring system is constituted by three modules: Programme breakdown structure (PBS), work breakdown structure (WBS), and organization breakdown structure (OBS). Value: The paper underlines that the existing organizational measures do not support multi-project in managing risk instead, the proposed methodology provides the multi-project manager with a new methods and tools. Additionally the methodology can reduce management difficulties in managing risk within a project portfolio.
Keywords: Organizational measure, risk management, three-dimensional structuring, multi-project.Read more
Abstract: Achieving high production and productivity is the primary concern to a mining company for remaining competitive in the present business scenario. The key to improving the performance is measuring it with a suitable method and then compare it with the standard one to assess the current status of performance. With the increasing effect of globalization and to do business, the mining equipment’s performance measurement system (PMS) requires a different dimensional approach covering all aspects of organizational functions. Absence of a notionally standard performance measure hinders the inter-organizational and intra-organizational performance comparison, knowledge and information exchange. A desirable performance measure should be holistic in nature, conceptually universal and measurable for the mining industry. This work reviews different types of performance measurement and their drawbacks. It presents the research trends to assist researchers and practitioners in further development in the area of performance measurement of mining equipment.
Keywords: Mining, performance, environmental, holistic equipment effectiveness (HEE), performance measurement (PM)Read more
Abstract: In the mining industry, the rock breakage by drilling and blasting plays a vital role as it facilitates not only fragmentation of rock mass but also controls consequent mining operation. In order to increase the production capacity or prolong the life of the deposit, the expansion of mine is unavoidable. However, when the mines are located in close to the habitations or any other sensitive areas, then there is often conflict due to the environmental effects due to blasting in the mines resulting in creating an adverse effect on industrial relation of the mine operator. Apart from maintaining the public relation, it is necessary to satisfy the mandate of the regulatory agencies due to imposition of statutory restrictions on the mine management while the mining operations are carried out in such challenging situations. The society generally expects that the negative impacts will be managed, and the benefits distributed fairly for ensuing sustainable mining. Ground vibration is one of the most environmental effects produced by any blasting operation affecting the structural characteristics of the buildings. Therefore, the proper prediction of blast-induced ground vibrations accommodating the influence of geological changes within the mine is essential to ensure the safety and stability of the structures not belonging to the mine operator during the blasting. This paper presents a case study where the expansion of the limestone quarry for the sustainable mining operations necessitates the usage of precise initiation system and adoption of suitable techniques for managing the other environmental impacts due to blasting
Keywords: Quarry, blasting, electronic detonators, ground vibration and fly rock.Read more
Abstract : Operators of opencast heavy earthmoving machinery (HEMM), during their 8-hour shift duration, are regularly succumbed to the high level of whole body vibration (WBV) amplitudes. Due to long and continuous working in the field, the operators of HEMM may yield to adverse health effects and results in hazardous conditions if the magnitudes repeatedly exceed the permissible limits. Based on extensive literature review, the authors of the paper put forward the recognized harmful adverse health effect of short and longterm WBV exposure of HEMM operators in surface mining and also with the same view with the findings of various researchers in this field and feels that for the safety of operators, long-term understanding of WBV should be carried out instead of short term vibration monitoring.
Keywords: Whole body vibration (WBV), heavy earthmoving machinery (HEMM), low back pain (LBP), health guidance caution zone (HGCZ), root mean square (RMS)Read more