Browsing by Author "Bujok, Petr"

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Access status: Open Access ,
A concept of research into the temperature of a rock mass on the campus of VŠB-Technical University of Ostrava
(2008) Bujok, Petr; Mikundová, Pavla
Geothermal heat pumps are appropriate for retrofit or new homes, where both heating and cooling are desired. In addition to heating and cooling, geothermal heat pumps can provide domestic hot water. They can be used for virtually any home size regions in any region of the Czech Republic. The use of heat from the upper layers of the earth's crust can be a useful and efficient method of saving energy. At around 50 m below the earth's surface the ambient temperature fluctuates between around 8-12 degrees of Celsius. This heat can be used by being transferred to the surface via a loop system using a high-efficiency refrigerant type material. These systems are also typically more efficient than gas or oil-fired heating systems. They are more energy efficient than air source heat pumps because they draw heat from, or release heat to, the earth, which has constant year's temperatures round, rather than to the air. Geothermal heat pumps use relatively constant temperature of the ground or water several meters below the earth's surface as source of heating and cooling.
Access status: Open Access ,
Analiza pomiarów inklinometrii w otworach geotermalnych na poligonie doświadczalnym VŠB - Uniwersytet Techniczny w Ostrawie
(2010) Bujok, Petr; Klempa, Martin; Rado, Robert
In the year 2009 arisen in the campus of VSB - Technical University of Ostrava new research polygon called Small Research Polygon (SRP). This research polygon is intended for investigation of regeneration and accumulation behavior of rock massive in the surroundings of energy exploited wells used by "small" consumers house holders. In the area of the Small Research Polygon are situated two operating wells attached to one heat pump and 9 monitored wells (each one of 140 m deep). A special complex of logging measurements including inclinometry was made during the realization of this project. The main goal of this article is data analysis about a steric progression of well axis in light of possible influences on curving of boreholes.
Access status: Open Access ,
Analysis of the hazards of the BAZALY football stadium in Ostrava in terms of environmental impact
(Wydawnictwa AGH, 2017) Bujok, Petr; Klempa, Martin; Pospíšil, Pavel; Rado, Robert; Porzer, Michał; Ryba, Jakub; Bláha, Martin; Poláček, Aleš
The term »geohazard« is used to describe the natural and anthropogenic phenomena and processes taking place in the natural environment in the context of their negative influence on natural environment, including the geological one. The degree of geohazard is frequently evaluated on the basis of catalogued descriptions (activity of natural environment and human impact), which help identify particular hazards and ascribe them their value. According to Czech standards, 45 geohazards have been classified and described in detail in view of: geological knowledge, origin and way in which the hazard was evoked, geographical range, time, associated processes, social aspect and monitoring methods. Research works were conducted in a football stadium located in an area of underground hard coal extraction and surface production of raw minerals. The BAZALY stadium, where FC Banik Ostrava played its matches, is located in Ostrava in an area of former mining fields of Silesian Ostrava. These coal mines were closed in the 1990s, but even so they still create environmental hazards. The paper is devoted to research works and risk analysis of the environmental impact of mining activities, old workings and liquidated mines in terms of geohazard. The basic geohazard in the stadium area is methane migration from tectonically disturbed rock mass, also caused by incorrectly closed workings. Another hazard is associated with the increasing mining damage, i.e. tectonic movements, subsidence, local sinkholes, lowering groundwater level etc.
Access status: Open Access ,
Application of enhanced oil recovery methods to oil deposits
(2006) Břiza, Karel; Bujok, Petr; Luner, Karel
At present, oil can be ranked among the most important fuels and energy minerals. In the majority of cases, primary recovery moves, however, merely in the range of 30-40% of original oil in place (geological reserves). But with deposits containing very viscous oil, percent recovery is much lower, i.e. from 5 to 10%, and the use of primary methods brings about only little economic effect. It is the application of so-called secondary and tertiary methods that enables the effective exploitation of reserves. In the submitted study, we present some results obtained by laboratory experiments with using polymers and surface-active agents in the displacement of highly viscous oil from reservoir rocks.
Access status: Open Access ,
Assessment of expected tightness of Uhřice-jih underground gas storage
(Wydawnictwa AGH, 2023) Horáková, Markéta; Rado, Robert; Bujok, Petr; Klempa, Martin; Kunz, Antonín; Křístek, Matěj
Underground gas storages (UGS) are an essential part of gas transmission systems in almost all countries that consume significant amounts of gas. This is because maximum capacity of transportation system cannot cover increased seasonal or any peak demand. The UGS’s systems are used as buffers to guarantee security and reliability of gas supply. The safety of UGS operation is ensured by the tightness of the storage geological structures, technical and technological equipment, which are known as primary and secondary tightness. This article evaluates the primary tightness conditions of selected Uhřice-jih UGS in the Czech Republic owned by MND Gas Storage a.s. Monitoring and control of the gas quantity balance in the reservoir was carried out using p/z curves method and based on mathematical modelling. In the article some of the aspects of secondary tightness UGS monitoring are also illustrated.
Access status: Open Access ,
CO₂ storing capacity in geologic formations in the Czech Republic
(2015) Bujok, Petr; Klempa, Martin; Labus, Krzysztof; Porzer, Michał; Pánek, Petr; Rado, Robert; González-Rodríguez, Marina A.
The $CO_{2}$ emission is a significant environmental problem threatening the sustained development of mankind. One of the possible ways of limiting the emission is the disposal of carbon dioxide in geologic formations.A pilot project of $CO_{2}$ storage in geologic formations in the Czech Republic (REPP-$CO_{2}$) is presented in this paper. The project is part of the Norwegian Fund and the research consortium (headed by the Czech Republic Geologic Office), with VSB-TU Ostrava as a participant. The VSB-TU Ostravais represented by the Faculty of Geology and Mining (HGF) and the Faculty of Metallurgy and Materials Science (FMMI) in the consortium.The research activity of the consortium mainly focuses on the development and improvement of selected laboratory methods, modelling and simulation, which are basic for the evaluation of safety of $CO_{2}$ storing in geologic forma-tions. Thise paper presents the research conducted by the Faculty of Geology and Mining (HGF) VSB-TU Ostrava within the project.
Access status: Open Access ,
Doświadczenia związane z budową poligonu badawczego dla niskoenergetycznych źródeł energii uzyskiwanych z górotworu na terenie VSB - Uniwersytet Techniczny W Ostrawie-Porubie
(2011) Bujok, Petr; Klempa, Martin; Koziorek, Jiři; Rado, Robert
During realization and operating of Research Polygons in areas of VSB - Technical University of Ostrava and AGH Kraków authors took many experiences which can be used for next construction of similar. This article will discuss experiences from realization and construction of the Large Research Polygon near the building Nova Aula (the biggest building in the Czech Republic which use heat pumps) and Small Research Polygon near the building Research Energetic Centrum, both in campus of VSB - Technical University of Ostrava, and also the results of the similar research polygon situated in the area of Drilling, Oil-Gas Faculty AGH Kraków.
Access status: Open Access ,
Evaluation of possibilities of CO2 geosequestration in geological structures of the Czech Republic
(2009) Bujok, Petr; Němec, Jaroslav; Konečný, Pavel; Němec, Petr
The present-day emissions of carbon dioxide (CO2) generated by anthropogenic activities and the expected future growing production of them are even now a serious ecological problem. One of possibilities of solving this situation is CO2 storage, i.e. the building of CO2 storage sites in suitable parts of the rock mass. They are represented, in addition to ideal localities, which are mined-out deposits of natural gas and oil, by selected geological formations of sedimentary Carboniferous deposits of hazd coal, it means localities of closed underground hard coal mines provided that they are ''tight'' enough. For the purposes of CO2 geosequestration, theoretically all closed hard coalfields exploited using the underground method in the Czech Republic can be considered, namely the Rosice-Oslavany (RUD), Kladno, Zacler-Svatonovice and Most Coalfields, and partial localities (closed mines) in the Czech part of Upper Silesian Hard Coal Basin (Ostrava-Karvina Coalfield). Of hydrocarbon deposits situated especially in the Vienna Basin, the Poddvorov, Nitkovice, Kostelany-vychod and Zdanice-zapad structures seem to be most promising.
Access status: Open Access ,
Modelowanie stref zagrożenia dla odwiertów gazowych
(2005) Bujok, Petr; Damec, Jaroslav; Drabkova, Sylva; Jancik, Petr; Rado, Robert
The exploitation of oil and gas has long lasting tradition. Therefore, more and more often there can be found negative results of this activity, above all so called ecologic loads. To these loads belong: a contamination of natural environment, contamination in superficial layer and contamination of water after uncontrolled leaks of rock oil during the mining or processing. Major problem are long closed gas and oil wells. Because of the industrialization of the areas, and also because of the long time, which passed since the end of exploitations, their condition leaves a lot to desire. This paper presents some of the problems concerning technical forecasting of out of operation oil and gas mines contamination zones.
Access status: Open Access ,
Možnosti utrácení CO2 v dotĕžovaných ložiscích uhlovodíků
(2007) Bujok, Petr; Břiza, Karel; Pánek, Petr; Svozil, Lukáš
The authors deal with problems of reduction of carbon dioxide emissions, carbon dioxide capture and possibilities of long-term storage in suitable storage sites, especially from the point of view of the so-called geosequestration (utilisation of geospheric sinks). It is hydrocarbon deposits where mining operations are being completed that seem to be the most suitable potential storage spaces. There, deposited CO2 sweeps out residual oil and increases the total recovery by 10-15%.
Access status: Open Access ,
Ocena wpływu warunków klimatycznych na bilans energetyczny górotworu na obszarze poligonu badawczego VSB - TU Ostrava
(2012) Bujok, Petr; Klempa, Martin; Koziorek, Jiři; Rado, Robert; Porzer, Michał
VSB - Uniwersytet Techniczny w Ostrawie posiada unikalną możliwość badania zmian temperatury w górotworze dla długotrwałego działania pomp ciepła. Nowy budynek Audytorium jest nie tylko największym obiektem w Republice Czeskiej, ale także w Europie Środkowej, ogrzewanym przez system pomp ciepła. Wraz z systemem otworów technologicznych pozyskujących ciepło z górotworu odwiercono również badawcze otwory monitorujące, które kontrolują zmiany temperatury w otaczającym górotworze podczas eksploatacji systemu grzewczego. System monitorowania zlokalizowany na obszarze działania otworów technologicznych nazywa się Dużym Poligonem Badawczym. VSB-TU posiada drugi systemu badawczego nazywany Małym Poligonem Badawczym i lokalizacją w pobliżu budynku Centrum Badań Energetycznych (CBE). Składa się ona z dwóch odwiertów technologicznych do eksploatacji energii cieplnej przy użyciu pomp ciepła i dziewięciu otworów monitorujących, położonych w pobliżu tych dwóch odwiertów. Wszystkie odwierty wykonane na terenie obu poligonów badawczych wyposażone są w czujniki, które monitorują zmiany temperatury podczas ogrzewania (pobieranie energii cieplnej z ośrodka skalnego w zimie) i chłodzenia (przekazywania energii do górotworu w okresie letnim). Głównym celem badań jest sprawdzenie funkcjonalności i wydajności całego systemu. W artykule zaprezentowano niektóre aspekty zagadnień pozyskiwania energii cieplnej z górotworu oraz wyniki uzyskanych analiz wynikających z monitoringu i pomiarów zmian temperatury w warstwach powierzchniowych górotworu do głębokości około 20 m.
Access status: Open Access ,
Petro-physical properties of geological formation in the aspect of possible CO₂ sequestration
(2013) Pavluš, Ján; Porzer, Michał; Bujok, Petr; Rado, Robert; Klempa, Martin
$CO_{2}$ emissions and a future increasing trend can be, by some scientists, considered a serious menace for the sustainable development of mankind and the reduction is necessary for the environment protection. Carbon dioxide is one of the most important gases that causes greenhouse effect, which warms up the earth surface as a consequence of a different heat flow between the earth and the atmosphere.
Access status: Open Access ,
Special shut off device for liquidating blowout from the drill string
(Wydawnictwa AGH, 2018) Bujok, Petr; Klempa, Martin; Ryba, Jakub; Porzer, Michał; Jakubčík, Marek; Štastný, Lukáš; Rado, Robert
Crude oil and natural gas belong to the most important raw minerals used by industry. Their world's consumption remains on a high level with an increasing tendency, similarly the demand for exploration-prospecting works. The drilling works associated with reservoir prospecting and development are connected with the risk of reaching intervals containing highly pressurized formation fluids and with blowouts. When drilling the first well in a given area, the operator frequently does not have a full set of data about reservoir parameters of the drilled horizons. Investors want the drilling companies finish their works in the shortest possible time, therefore technologies which maximize the drilling advancement are employed. One of such techniques is drilling with minimally higher hydrostatic pressure of mud as compared to the reservoir pressure. If the drilling hits a porous interval of elevated reservoir pressure, reservoir fluid may inflow to the wellbore. If the hydrostatic pressure of fluid column in the wellbore is lower than reservoir pressure, the wellbore will be fed with reservoir water, which will consequently migrate towards the top of the well. This may result in a kick and then a blowout. The inflow to the wellbore can be handled only by well trained crew and appropriate equipment. The crew has to recognize the flow, and depending on the condition of the well take suitable measures. Sometimes the lack of proper training, errors, hardware failures and improperly protected top of the well lead to a fully developed blowout from the well. Particularly dangerous are cases when the surface blowout prevention equipment or other elements of the well BOP facilities break down. In such situations rescue teams with specialist equipment have to be involved. Exemplary applications and technological potential of specialist blowout control equipment in uncontrolled kick of reservoir fluid though the string are presented in the paper. The designed tool and its functions allow for killing or reducing the outflow.
Access status: Open Access ,
Techniczne aspekty wiercenia kierunkowego z częściowym wykorzystaniem istniejących otworów
(2011) Rado, Robert; Lubaś, Jan; Bujok, Petr
Advancement in drilling techniques and technology enables using directional boreholes for a variety of drilling situations. Directional drilling technologies started to be commonly applied for gas and oil reservoir completion. The directional drillings use few techniques that can be applied to drill a borehole with the composed trajectory. Thanks using the directional drillings are possible to lower the drilling investment costs and increasing its efficiency by using some part of existing boreholes. Such idea of drilling let's take advantages of experiences collected while drilling of existing borehole, determinate proper borehole design and reduce the risk of drilling complications. This paper analyses possibility of using different techniques for directional drilling by using part of existing wellbore.
Access status: Open Access ,
The development of the industrial city Hodonín (Czech Republic) from the perspective of tourism
(Wydawnictwa AGH, 2016) Klempa, Martin; Bujok, Petr; Porzer, Michal
This article deals with the development of tourism and the transformation of a small, but significant for its industrial past, Southern Moravian town of Hodonín and its surroundings. The history of the city is briefly summarized and put in context with the progressing industrialization of the region (production of lignite and hydrocarbons, followed by a significant reduction of industries and, consequently, resulting touristic activities). Specifically, the most attractive regional touristic activities, such as enotourism, cyclo-tourism and water tourism, are listed in this paper. In particular, cyclo-tourism is strongly linked with enotourism as most of the cycling trails (included into the Greenways network) pass through the best known wineries in the area, and they also form a functional system of communication routes with basic cycling trails in the Czech Republic. The progress in the development of water tourism is, by contrast, enabled by industrial advancements, where the Baťa Canal (an important technical monument) has been utilized as a waterway. Eventually, the Museum of Oil Mining and Geology in Hodonín attractively introduces the tourists into the history and present state of oil and gas production in the region.
Access status: Open Access ,
The problem of liquidation of the open eruption by drilling tools
(2014) Fibingr, Jaroslav; Bujok, Petr; Klempa, Martin; Porzer, Michał; Kalus, Dalibor; Rado, Robert
Drilling process of deep borehole consists of different drilling operations. Each of them can cause numerous different drilling problems especially when a borehole is performed. While drilling the most dangerous problems can occur once the drilling fluids (oil, gas or water) spontaneously flow out from the drilled formations into the borehole and then to the surface. It can also happen that the pressures in the borehole are not balanced and an influx of fluid into the borehole (a kick) will occur. If no action is taken to stop a kick once it begins, then the fluids will be pushed out of the borehole and will be flowing uncontrollably to surface (blow-out). Blow-out is prevented by closing off the well at the surface with special kind of valves (Blow-out Preventers - BOPs). When pressure control over the well is lost, swift action must be taken to avert the severe consequences. These consequences may include: — endangering of human life, — loss of rig and equipment, — negative influence on the environment, — additional costs of bringing the well under control again, — loss of reservoir production. In the case of kick or blow-out will occur in the practical use are different procedures and methods to control a borehole. These procedures and methods depend on the actual drilling operation scenario. One of them can be a tripping operation when the drill string is pulled out or run back again. In this case the drill string is open either after a break-out or before making up the drill pipes and drill collars. There is a variety of tools that can be used to prevent the formation of fluids rising up inside the drill pipes. One of this tool is a safety valve (rod preventers - BOP) to prevent the blow-out of the drill string. This manuał safety valve should be kept on the rig floor at all times. It needs to be a fuli opening ball-type valve so there is no restriction to flow. This valve is installed onto the top of the drill string if a kick occurs during a trip. However, this solution is quite inconvenient and difficult because involves special heavy tools, e.g. a crane. Drilling process of deep borehole consists of different drilling operations. Each of them can cause numerous different drilling problems especially when a borehole is performed. While drilling the most dangerous problems can occur once the drilling fluids (oil, gas or water) spontaneously flow out from the drilled formations into the borehole and then to the surface. It can also happen that the pressures in the borehole are not balanced and an influx of fluid into the borehole (a kick) will occur. If no action is taken to stop a kick once it begins, then the fluids will be pushed out of the borehole and will be flowing uncontrollably to surface (blow-out). Blow-out is prevented by closing off the well at the surface with special kind of valves (Blow-out Preventers - BOPs). When pressure control over the well is lost, swift action must be taken to avert the severe consequences. These consequences may include: — endangering of human life, — loss of rig and equipment, — negative influence on the environment, — additional costs of bringing the well under control again, — loss of reservoir production. In the case of kick or blow-out will occur in the practical use are different procedures and methods to control a borehole. These procedures and methods depend on the actual drilling operation scenario. One of them can be a tripping operation when the drill string is pulled out or run back again. In this case the drill string is open either after a break-out or before making up the drill pipes and drill collars. There is a variety of tools that can be used to prevent the formation of fluids rising up inside the drill pipes. One of this tool is a safety valve (rod preventers - BOP) to prevent the blow-out of the drill string. This manuał safety valve should be kept on the rig floor at all times. It needs to be a fuli opening ball-type valve so there is no restriction to flow. This valve is installed onto the top of the drill string if a kick occurs during a trip. However, this solution is quite inconvenient and difficult because involves special heavy tools, e.g. a crane. This paper presents a new solution making use of special control equipment for the blowing open drill string. This equipment is based on a hydraulic press (named »Drill Pipe Rescue Press I«) which has been developed by HBZS, MND S.A. Hodonin and VSB-Technical University of Ostrava, supported by Faculty of Drilling, Oil and Gas AGH-UST Kraków.
Access status: Open Access ,
Utilization of high potential geothermal energy in the Czech Republic
(2016) Klempa, Martin; Rado, Robert; Bujok, Petr; Porzer, Michał; Janečková, Nikola
In the Czech Republic the electrical energy and heat from geothermal energy can be generated with the use of Engineering/Enhancing Geothermal System (EGS). In this case a downhole heat exchanger is performed to a depth at which the temperature of the rock mass is at least 150–160 ° C or more, preferably about 200 ° C. Taking into account the geological conditions in the Czech Republic, such temperatures can be ob- served at about 5000–6000 m of depth. The site of a pilot project of geothermal electrical energy production was selected on the basis of the analysis of deep-seated geological structures in the Czech Republic, i.e. area of crust faults in the Ore Mountains Erzgebirge. The selected geological units consist of the Ore Mountains Fault and Central Bohemian Uplands, which are part of the Ohersky Rift Valley. Two deep research wells are planned in that area, with detailed geological, geophysical and geothermal analyses, including laboratory analyses of sampled rocks (cores).
Access status: Open Access ,
Ways of increasing natural gas storage capacity in underground gas storages in the Czech Republic
(Wydawnictwa AGH, 2019) Bujok, Petr; Klempa, Martin; Kunz, Antonin; Porzer, Michał; Rado, Robert; Roček, Erik; Ryba, Jakub
Natural gas fields are usually located far away from the end users and industrially developed countries, where the gas demand is highest. In such cases, natural gas is transported from the production site to the receiver mainly with gas pipelines. Such pipelines may transmit a definite volume of natural gas. Most of the time gas transport is stable in time, unless the demand changes, e.g. in winter or in the case of pipeline failure. In such a case the pipeline system cannot cover the increased demand and supply sufficient amounts of gas. One of the ways to solve the problem of varying demand and limited potential as far as gas transmission over long distances is concerned, are underground gas storages, thanks to which the operational gas deliveries can be regulated, i.e. it can be stored in periods of lower demand and used in the high demand situations. This safety buffer provides the stability and reliability of the entire natural gas distribution system. The methods of increasing the natural gas storage capacity of UGS were discussed in this paper with special emphasis on the primary and secondary tightness of geological structures hosting UGS. Authors also analyzed how laboratory tests conducted at VŠB-TU Ostrava can be broadened to verify the possibilities of increasing natural gas storing capacity, depending of the geological horizons and structures in which the UGS is located.
Access status: Open Access ,
Wpływ wybranych czynników chemicznych i fizycznych na właściwości zużytych płuczek wiertniczych
(Data obrony: 2009) Jamrozik, Aleksandra
Wydział Wiertnictwa, Nafty i Gazu
Certain quantities of waste are produced in the oil industry as a result of drilling operations. Composition and properties of drill waste can change substantially depending on the geological and technological drill conditions as well as on the types of used drill fluids. The main features that are responsible for disqualifying further utilization of used drill fluids are the following: composition of certain types of organic toxins, heavy metals (usually $Cr, Cu, Pb, Zn$), specific salts of alkaline elements in the form of chlorides (usually $K, Na$) as well as sulfides and carbohydrates that are present in excessive amounts. From the standpoint of rational waste management we should try to avoid excessive production of wastes. However, in the event when excessive amounts of waste accumulate, we should appropriately invest them, so they may be re-utilized in the future. At present the most popular treatment method of drill waste is the broadly comprehended recycling process. The main goal of this research project was to analyze the influence of mineral supplements, UV-A radiation and the temperature on the properties of used drilling fluids. Laboratory research permitted to establish to what extent physical, mechanical, chemical as well as microstructure properties of waste drilling fluids have improved in terms of their utilization. In order to accomplish the above-mentioned tasks the following used drill fluids have been employed: potassium-polymer drill fluid, potassium drill fluid, glycol-potassium drill fluid, - drill fluid without loam. The analysis of the aforementioned materials enabled to elaborate a specific standard that may be applied to any type of drill fluids. The main purpose of course is to determine a way to invest and utilize used drill fluids. In this research the author analyzed water-based used drill fluids that are commonly used in the national oil and gas drilling project in Carpathian Mountains and Carpathian Subsidence Basin.