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Daria Karasalihović Sedlar
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia

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Journal article
Published: 21 August 2021 in Energies
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The main objective of the paper was comparative analyses of natural gas quantities delivered through the existing pipeline capacities in the last decade and new pipeline capacities for the prediction of possible future flows of gas import to Europe. Changes in physical flows have been influenced by European energy strategies that became green oriented resulting with a high amount of non-utilized transmission capacities. The research findings have shown that there is a significant decrease observed in transit of Russian gas through Ukraine in 2020 than previously. Concerning the high increase of LNG import to Europe in the same year, the start of operation of TurkStream, planned start of operation of Nord stream 2, authors project the gradual decrease of transit of Russian gas through Ukraine until the year 2025 with the total stop of transit of Russian gas until the year 2030. The change of supply routes will be also under the economic influence of low gas prices and coal and gas fuel switch until 2030 in the West EU, and after 2030 in the South Eastern European region. In the short-term period transit system for natural gas from Russia via Ukraine will be necessary for supplementing coal with natural gas in the energy mix.

ACS Style

Filip Božić; Daria Karasalihović Sedlar; Ivan Smajla; Ivana Ivančić. Analysis of Changes in Natural Gas Physical Flows for Europe via Ukraine in 2020. Energies 2021, 14, 5175 .

AMA Style

Filip Božić, Daria Karasalihović Sedlar, Ivan Smajla, Ivana Ivančić. Analysis of Changes in Natural Gas Physical Flows for Europe via Ukraine in 2020. Energies. 2021; 14 (16):5175.

Chicago/Turabian Style

Filip Božić; Daria Karasalihović Sedlar; Ivan Smajla; Ivana Ivančić. 2021. "Analysis of Changes in Natural Gas Physical Flows for Europe via Ukraine in 2020." Energies 14, no. 16: 5175.

Review
Published: 17 August 2021 in Energies
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Hydrocarbon exploration and production activities are basic to the functioning of the oil and gas industry, while concession contracts and fees are central concepts in the aforementioned activities. The authors consider several questions regarding these concepts, such as: what is the legislative, institutional, and fiscal framework in certain European countries regarding hydrocarbon exploration and production? What are the major differences between them? Finally, is there room for improvement of the framework in the Republic of Croatia? To answer these questions, the authors contacted some of the relevant institutions and accessed official government gazettes, institution websites, legal aggregators, journal articles, books, and different legal publications regarding the oil and gas industry for several European countries, namely the Kingdom of Norway, the Russian Federation, the Republic of Austria, and the Republic of Croatia. As a result, this paper presents an overview of legislation, institutions, concession contracts, taxes, and fees for each of the aforementioned countries. The authors conclude that the Republic of Croatia could benefit from applying some foreign solutions in its own legislative and fiscal framework, i.e., using a sliding scale for royalty calculation and simplifying some administrative procedures.

ACS Style

Marko Kolovrat; Lucija Jukić; Daria Karasalihović Sedlar. Comparison of Hydrocarbon Fiscal Regimes of Some European Oil and Gas Producers and Perspectives for Improvement in the Republic of Croatia. Energies 2021, 14, 5056 .

AMA Style

Marko Kolovrat, Lucija Jukić, Daria Karasalihović Sedlar. Comparison of Hydrocarbon Fiscal Regimes of Some European Oil and Gas Producers and Perspectives for Improvement in the Republic of Croatia. Energies. 2021; 14 (16):5056.

Chicago/Turabian Style

Marko Kolovrat; Lucija Jukić; Daria Karasalihović Sedlar. 2021. "Comparison of Hydrocarbon Fiscal Regimes of Some European Oil and Gas Producers and Perspectives for Improvement in the Republic of Croatia." Energies 14, no. 16: 5056.

Journal article
Published: 02 July 2021 in Energy Reports
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In 2019, natural gas accounted for 25.4% of gross inland consumption in the European Union (EU), making it one of the most important energy sources in the EU. The importance of natural gas, together with the ongoing liberalization of the gas market, has made the natural gas sector significantly commercially sensitive. To reduce the risk of financial losses, balance group managers often need to have an accurate forecast of natural gas consumption. An accurate forecast will ensure small deviations between actual gas consumption and reserved gas volumes and transmission system capacity resulting in less balancing energy required, which is sold at a higher price in the final balancing process. This paper researches the optimal number of smart meters and best fitted consumption data distribution in order to achieve satisfactory results in terms of the accuracy by using simple forecasting methods. Beside mentioned, this paper provides accuracy overview of various already available forecasting methods, as well as the selection of input parameters for forecasting short term natural gas consumption. Using the calculated linear temperature dependence together with the lognormal distribution, the consumption of natural gas was simulated for 12 different cases. The simulation showed that, if more than 10 000 smart meters were installed, deviation between average estimated natural gas consumption and the real data would be less than ±2.96 %. In case of 100 000 smart meters installed, deviation would be less than ±1.20 %, but the “large” partly temperature independent consumers must be disregarded.

ACS Style

Ivan Smajla; Daria Karasalihović Sedlar; Domagoj Vulin; Lucija Jukić. Influence of smart meters on the accuracy of methods for forecasting natural gas consumption. Energy Reports 2021, 1 .

AMA Style

Ivan Smajla, Daria Karasalihović Sedlar, Domagoj Vulin, Lucija Jukić. Influence of smart meters on the accuracy of methods for forecasting natural gas consumption. Energy Reports. 2021; ():1.

Chicago/Turabian Style

Ivan Smajla; Daria Karasalihović Sedlar; Domagoj Vulin; Lucija Jukić. 2021. "Influence of smart meters on the accuracy of methods for forecasting natural gas consumption." Energy Reports , no. : 1.

Journal article
Published: 09 November 2020 in Rudarsko-geološko-naftni zbornik
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The Network Code on Gas Balancing of Transmission Networks stimulates the development of the wholesale gas market by encouraging balance responsible parties to use standardized balancing mechanisms. To balance their portfolios, balance responsible parties can use renominations of quantities at entry and exit points, trade on a virtual trading point or trade on a trading platform. In the event of a system imbalance, Plinacro, as the operator of the gas transmission system in the Republic of Croatia, activates the balancing energy to return the system within acceptable limits. In accordance with the Rules on the Organization of the Gas Market, the Croatian Energy Market Operator performs a monthly calculation of the daily imbalance charge, trades conducted on the trading platform for balancing activities, a neutrality charge and a charge for deviation from the nominated quantities which have been analysed in this paper based on the case study of a chosen balancing group. The analyses conducted in the paper have shown that the balance responsible party may be entitled to compensation or be liable to pay compensation based on the monthly calculation of the Croatian Energy Market Operator, HROTE, depending on the value of each charge. Plinacro as the forecasting party is preparing a new model for the allocation of gas quantities that will affect the operations of gas suppliers, DSOs and especially BRPs. Based on this analysis, it could be concluded that more accurate estimated consumption for a balancing group leads to cost optimization and a more transparent gas market.

ACS Style

Dominik Kevo; Ivan Smajla; Daria Karasalihović Sedlar; Filip Božić. CROATIAN NATURAL GAS BALANCING MARKET ANALYSIS. Rudarsko-geološko-naftni zbornik 2020, 35, 45 -56.

AMA Style

Dominik Kevo, Ivan Smajla, Daria Karasalihović Sedlar, Filip Božić. CROATIAN NATURAL GAS BALANCING MARKET ANALYSIS. Rudarsko-geološko-naftni zbornik. 2020; 35 (4):45-56.

Chicago/Turabian Style

Dominik Kevo; Ivan Smajla; Daria Karasalihović Sedlar; Filip Božić. 2020. "CROATIAN NATURAL GAS BALANCING MARKET ANALYSIS." Rudarsko-geološko-naftni zbornik 35, no. 4: 45-56.

Journal article
Published: 09 November 2020 in Rudarsko-geološko-naftni zbornik
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This paper analyzes the possible role of liquefied natural gas (LNG) in the region in reducing carbon dioxide (CO2) emissions by replacing a certain part of solid fossil fuels. Increasing natural gas consumption, declining North Sea natural gas reserves and increased natural gas production costs in Europe combined have created new opportunities for LNG in Europe. The Energy Strategy of Croatia is focused on intensifying the transit position for natural gas that could establish Croatia as a primary LNG market for countries from the region, which shows that the Energy Strategy supports LNG. Concerning LNG’s introduction into the regional gas market, this paper analyses the possibility of establishing a regional gas hub. The region in this paper includes the following countries: Croatia, Serbia, Bosnia and Herzegovina, Hungary, Slovenia, and North Macedonia. On the other hand, the observed markets are not organized and sufficiently liquid, which is a crucial precondition for hub establishment. In order to decrease the region’s dependence on pipeline natural gas, it is necessary to construct gas interconnections between Croatia – Serbia, Croatia – Bosnia and Herzegovina and Serbia – North Macedonia. With the mentioned interconnections, the region could achieve greater security of natural gas supply. This paper discusses the possibility of utilizing the full capacity of a LNG terminal as a source of natural gas supply for the purpose of replacing solid fossil fuels in the region’s primary energy consumption. By replacing solid fossil fuels with natural gas, it is possible to achieve significant savings on CO2 emissions, which contributes towards a green and sustainable future.

ACS Style

Ivan Smajla; Romana Crneković; Daria Karasalihović Sedlar; Filip Božić. POTENTIAL OF CROATIAN LIQUEFIED NATURAL GAS (LNG) TERMINAL IN SUPPLYING REGIONAL NATURAL GAS MARKETS. Rudarsko-geološko-naftni zbornik 2020, 35, 93 -101.

AMA Style

Ivan Smajla, Romana Crneković, Daria Karasalihović Sedlar, Filip Božić. POTENTIAL OF CROATIAN LIQUEFIED NATURAL GAS (LNG) TERMINAL IN SUPPLYING REGIONAL NATURAL GAS MARKETS. Rudarsko-geološko-naftni zbornik. 2020; 35 (4):93-101.

Chicago/Turabian Style

Ivan Smajla; Romana Crneković; Daria Karasalihović Sedlar; Filip Božić. 2020. "POTENTIAL OF CROATIAN LIQUEFIED NATURAL GAS (LNG) TERMINAL IN SUPPLYING REGIONAL NATURAL GAS MARKETS." Rudarsko-geološko-naftni zbornik 35, no. 4: 93-101.

Journal article
Published: 06 February 2019 in Energies
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Liquefied natural gas (LNG) use as a fuel in road and maritime traffic has increased rapidly, and it is slowly entering railroad traffic as well. The trend was pushed by the state administrations of mainly EU countries and international organizations seeing LNG as a cost-effective and environmentally friendly alternative to diesel. Different infrastructural projects for the widespread use of LNG in transport have been launched around the world. The main goal of this paper was to analyze use of LNG as a fuel for heavy trucks. Different aspects of LNG chain were analyzed along with economical and ecological benefits of LNG application. Filling stations network for LNG were described for the purpose of comparative analysis of diesel and LNG heavy trucks. Conclusion has shown that using LNG as propellant fuel has numerous advantages over the use of conventional fuels. The higher initial investment of the LNG road vehicles could be amortized in their lifetime use, and in the long-term they are more affordable than the classic diesel vehicles. In addition to cost-effectiveness, LNG road vehicles reduce CO2 emissions. Therefore, the environmental goals in transport, not only of the member states but worldwide, could not be met without LNG in heavy truck traffic.

ACS Style

Ivan Smajla; Daria Karasalihović Sedlar; Branko Drljača; Lucija Jukić. Fuel Switch to LNG in Heavy Truck Traffic. Energies 2019, 12, 515 .

AMA Style

Ivan Smajla, Daria Karasalihović Sedlar, Branko Drljača, Lucija Jukić. Fuel Switch to LNG in Heavy Truck Traffic. Energies. 2019; 12 (3):515.

Chicago/Turabian Style

Ivan Smajla; Daria Karasalihović Sedlar; Branko Drljača; Lucija Jukić. 2019. "Fuel Switch to LNG in Heavy Truck Traffic." Energies 12, no. 3: 515.

Journal article
Published: 07 September 2018 in Rudarsko-geološko-naftni zbornik
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According to analysed oil reserves and oil production worldwide during 1995, 2005 and 2015, a global increase in oil re- serves is observed. In 1995, there were 179.1 × 10^9 m3, in 2005 there were 218.5 × 10^9 m3 and in 2015 there were...

ACS Style

Marija Ledenko; Josipa Velić; Daria Karasalihović Sedlar. ANALYSIS OF OIL RESERVES, PRODUCTION AND OIL PRICE TRENDS IN 1995, 2005, 2015. Rudarsko-geološko-naftni zbornik 2018, 33, 105 -115.

AMA Style

Marija Ledenko, Josipa Velić, Daria Karasalihović Sedlar. ANALYSIS OF OIL RESERVES, PRODUCTION AND OIL PRICE TRENDS IN 1995, 2005, 2015. Rudarsko-geološko-naftni zbornik. 2018; 33 (4):105-115.

Chicago/Turabian Style

Marija Ledenko; Josipa Velić; Daria Karasalihović Sedlar. 2018. "ANALYSIS OF OIL RESERVES, PRODUCTION AND OIL PRICE TRENDS IN 1995, 2005, 2015." Rudarsko-geološko-naftni zbornik 33, no. 4: 105-115.

Journal article
Published: 17 August 2018 in Journal of Petroleum Science and Engineering
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Analysis of change in composition of flaring gas during the exploitation period of an oil reservoir has been performed to estimate possibilities for feasible reduction of CO2 emissions during hydrocarbon production. There are many projects regarding improvements of energy and flare efficiencies or possibilities for CO2 separation and storage, but none of them calculates emissions for different p-T conditions. Numerous oil fields do not have possibilities for transport of gas separated during oil production to final consumers due to technological or economic limitations. This paper deals with possibility of introducing small technological improvement like implementation of gas separator, which might lead to CO2 reduction at flare. First, it was necessary to calculate accurate oil production decline through lifetime of a reservoir, then pressure decline for a mature oil field was correlated. The payout period for such improvement, along with other economical parameters, has been calculated in economic analysis. It can be concluded that CO2 reduction is possible and economically feasible by introducing separator at oil production field.

ACS Style

Daria Karasalihović Sedlar; Domagoj Vulin; Lucija Jukić; Ivan Smajla. Possibility of decreasing CO2 emissions from flaring on a mature oil field. Journal of Petroleum Science and Engineering 2018, 171, 1302 -1308.

AMA Style

Daria Karasalihović Sedlar, Domagoj Vulin, Lucija Jukić, Ivan Smajla. Possibility of decreasing CO2 emissions from flaring on a mature oil field. Journal of Petroleum Science and Engineering. 2018; 171 ():1302-1308.

Chicago/Turabian Style

Daria Karasalihović Sedlar; Domagoj Vulin; Lucija Jukić; Ivan Smajla. 2018. "Possibility of decreasing CO2 emissions from flaring on a mature oil field." Journal of Petroleum Science and Engineering 171, no. : 1302-1308.