No. 6/2019

RISK ASSESSMENT IN PROJECT PHASES
Eng. Dobri Dobrev, dobri.iv.dobrev@gmail.com –
University of Mining and Geology „St. Ivan Rilski”

ABSTRACT
The article discusses methods for risk assessment and their applicability to the main stages of the life cycle of the main gas. These are described for the purposes of the method, its advantages and disadvantages. There are sample schemes for hazard and consequence analysis. Statistical models for processed data are proposed.
Keywords: risk assessment methods, event trees, gas pipeline

No. 6/2019

Quantitative assessment of the main characteristics different types of underwater mining technologies

assist. prof. Dr. Daniel Georgiev, daniel_georgiev@abv.bg
assoc. prof. Dr. Evgeniya Aleksandrova, jogeni@abv.bg
assist. prof. Dr. Simeon Asenovski, asenovski@gmail.com
eng. Dimitar Kaykov, dimitar.kaykov@gmail.com
prof. Dr. Ivaylo Koprev, ivokoprev@gmail.com –
University of Mining and Geology „St. Ivan Rilski”

No. 6/2019

THEORETICAL CALCULATIONS OF TECHNOLOGICAL PARAMETERS OF THE ACTION OF ACID AND NON-ACIDIC WORKING SOLUTIONS ON THE WRINKLE ZONE OF THE PLATE
Karibaev Askar Amirkhanovich, 9999012@mail.ru
Doctoral student of the Mining and Geological University “St. Ivan Rilski “, Sofia

ABSTRACT
The purpose of the article is to theoretically study the process of exposure of acidic and non-acidic working solutions to the bottomhole formation zone. Theoretical calculations and graphical dependences are presented that allow determining and estimating the penetration depths and changes in the heating temperature of the fluid injected into the formation at a constant injection rate. The wave nature of changes in the concentration of a substance during filtration and mass transfer of flushing fluid in permeable formations has been established and studied. The results were summarized in tables, where the calculated values of the processing time of the PPP and the length of the propagation zone of the saturation front are presented. Analysis of the research results showed that with an increase in temperature, the processing time of the near-wellbore zone decreases depending on its length, especially if the length of the treatment zone is quite large.
KЕYORD: impact process, acid and non-acidic working solutions, bottomhole formation zone, penetration depth, heating temperature, fluid injected into the formation, injection rate, zone length, saturation front.

No. 7/2019

INNOVATIONS AND INNOVATION ACTIVITY OF THE COMPANIES FROM THE EXTRACTIVE SECTOR OF THE BULGARIAN ECONOMY
Assoc. Prof. Dr. Dimitar Blagoev, e-mail: blagoev@unwe.bg
Industrial Business Department, Business Faculty, University of National and World Economy, Sofia, Bulgaria

ABSTRACT
We will not make a mistake if we say that innovation is one of the cornerstones for achieving competitiveness and a key factor for a sustainable competitive advantage of companies. Particularly relevant is their importance in recent decades, with the development of information and communication technologies, the Internet of things and other modern technologies. The implementation of modern technologies in the so-called “traditional sectors” of the national economy, as the extractive industries is key to modernising its processes and achieving a higher level of efficiency. The main purpose of the article is to trace the innovation activity of the companies in the extractive sector of the Bulgarian economy in comparison with the innovation activity in total for the economy and the perceived for the most innovative-startup companies.
Keywords: Innovation, Industry, Extracting Industry, Enterprise, Economy

No. 7/2019

MULTI-PURPOSE GEOINFORMATION PORTAL OF THE UNIVERSITY OF MINING AND GEOLOGY “ST. IVAN RILSKI”
Assoc. Prof. asparuh kamburov, PhD, asparuh.kamburov@mgu.bg
Assoc. Prof. Ivan Mitev, PhD, ivan_mitev@mgu.bg
University of Mining and Geology “St. Ivan Rilski”, Sofia

ABSTRACT
This publication describes the development of an enterprise GIS portal and web-application, allowing user upload of borders of planned exploration areas (in various GIS formats) and analysis of conflict zones with existing sanitary-protective zones. All services are created with ESRI Enterprise 10.7.1. (Server, Portal, Datastore, Pro and Web AppBuilder), licensed for education and research in University of Mining and Geology “St. Ivan Rilski”. All data is acquired according the Access to Public Information Act. The web-application provides a convenient and interactive access to data for a wide range of users in the raw material industry, including mining companies, government institutions and researchers.
Keywords: GIS, ArcGIS, web application, cloud technologies

No. 7/2019

Principles and approaches to detemining available technology for mechanized exploitation of oil wells
Assist. Prof. PhD Lachezar Georgiev – lucho_sdng1@mail.bg
University of mining and geology „St. Ivan rilski“

ABSTRACT
The nature and conditions of applicability of the available technologies for mechanized exploitation of oil well are presented. The principles and approaches for determining effective technology for the mechanized exploitation of oil wells are examined.
Keywords: mechanized exploitation of oil wells, sucker rod pumps

Issue  6/2019

Summary

The author deals with the problem of contemporary climate change in terms of paleoclimatology. The main factors and the complex relationships between them that affect the climate are examined. The author also looks at “global warming”, emphasizing that the suggestion that we can stop the current trend toward a slight rise in Earth’s temperatures is naive.