Browsing by Subject "drilling technology"

Now showing 1 - 8 of 8

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 ,
Drillability and Mechanical Specific Energy analysis on the example of drilling in the Pomeranian Basin
(2015) Wiśniowski, Rafał; Knez, Dariusz; Hytroś, Łukasz
The advancements in drilling have always depended on the cost of drilling of new wellbores, therefore mathematical models of the drilling process were elaborated to minimize the cost. The first simple models based on a few fundamental parameters, were then developed into complex, computer-based models employing many variables. Models made for cutter bits are used for PDC tools. They contain formulae accounting for drilling parameters and wearing of the bit. The paper addresses works which prove that in some particular situations the influence of the tools wear on the drop of rate of penetration can be neglected, thanks to which simple formulae are obtained, based on the fundamental parameters and which are easily applicable in the field conditions. The MSE is an amount of energy used for drilling a given volume of rock. This approach is useful and practicable because allows for detecting possible inefficiencies in a relatively short time (as compared to other parameters). Attempts are made to compare the drillability indications ZSP with MSE plots, thanks to which new conclusions and observations can be drawn as far as the analysis and interpretation of drillability plots is concerned.
Access status: Open Access ,
Drilling intake wells in carbonate formations to provide water for drilling purposes
(Wydawnictwa AGH, 2020) Macuda, Jan; Łukańko, Łukasz
The realization of drilling works oriented towards the prospection and extraction of hydro- carbons from conventional and unconventional resources requires the supply of large amounts of water for technological purposes and fracturing jobs in shale formations. One of the important sources of water supply for wellbores may be useful groundwater levels taken in by deep wells. Technological processes accompanying drilling works and other technological operations require large amounts of water in a short period of time. The possibility of drilling intake wells at the drilling site significantly reduces the costs of acquiring the necessary quantities of water and facilitates its transfer to technological installations. Such wells must have high yields. Accordingly, this necessitates drilling wells with a relatively large diameter to accommodate filters with a large active surface area, a considerably thick gravel pack, and a high-capacity pumping unit. Drilling large diameter intake wells in difficult geological conditions using the rotary percussion method with simultaneous casing is much more efficient than the water-based rotary mud or percussion methods used to date. This paper presents principles for selecting technological parameters of drilling large diameter wells in difficult geological conditions using the percussion-rotary method with simultaneous casing. Among the main advantages of this method (as compared to the rotary method with drilling fluid) is its high RPM and the related lower cost of the well. Eliminating water?based drilling mud has a positive effect on the hydraulic efficiency of the well and enhancement work can be omitted in many cases.
Access status: Open Access ,
Drilling large diameter water wells in carbonate strata in the Lublin area
(Wydawnictwa AGH, 2018) Macuda, Jan; Macuda, Małgorzata
One of the most important sources of water for communal purposes in the Lublin area are the useful groundwater aquifers intaken with deep drilled wells. Such wells should be highly efficient and localized in a close vicinity of the local water supply network to lower the cost of transport. Large amounts of water can be produced by large diameter wells, where heavy duty pump aggregates can be installed. High rates of penetration cannot be obtained if the profile abounds in hardly drillable carbonate. This elongates the time of drilling and increases negative impact of mud on the near well zone of the aquifer. It also lowers hydraulic parameters of the well. To improve the efficiency of the wells, drillability tests with cogged bits were performed in carbonate rocks to optimize the mechanical parameters of drilling. Measurement sections, each 0.3 to 0.5 m long, were selected for the tests. Each section was drilled at constant rotational speed and weight of bit values. Prior to the drillability tests, the limits on the weight of bit and rotational speed of the bit were established, in line with the technological characteristic of rig Wirth B3A, strength of the string and of the cogged bit.
Access status: Open Access ,
Modyfikowanie parametrów technologicznych zaczynów uszczelniających sporządzonych na osnowie cementów portlandzko-popiołowych popiołami fluidalnymi
(2008) Stryczek, Stanisław; Gonet, Andrzej; Zieliński, Jakub
The results of analyses of influence of additive (fluidal ash) concentration on technological parameters of fresh and set sealing slurry based on Portland cement and ash are presented in the paper. A detailed analysis of the obtained laboratory results suggests that this type of slurry could be used for liquidating absorptive zones on the rock mass.
Access status: Open Access ,
Monitorowanie wpływu wybranych czynników na zużycie elementów zestawu wiertniczego i sposoby jego ograniczenia w Exalo Drilling S.A.
(Wydawnictwa AGH, 2019) Beliczyński, Rafał; Suszko, Piotr
Celem artykułu jest przedstawienie szkodliwego wpływu na zestaw wiertniczy takich czynników jak korozja chemiczna, wpływ H?S oraz czynników mechanicznych. Dokładna analiza, a także studiowanie przyczyn uszkodzeń zestawu przewodu wiertniczego pozwalają na opracowanie procedur poprawiających żywotność sprzętu wiertniczego, a tym samym wskaźniki bezpiecznego wiercenia. W procesie wiercenia kolumna zestawu wiertniczego poddawana jest siłom rozciągającym, zginającym, skręcającym, ściskającym, tarcia oraz niekorzystnemu wpływowi płynów wypełniających otwór wiertniczy, zarówno tym technologicznym, jak i tym pochodzącym z górotworu. W celu przeciwdziałania potencjalnym uszkodzeniom stosowany jest sprzęt o wyższych parametrach wytrzymałościowych. Musi być on odporny na szybkie zużycie, często jest wykonany z droższych materiałów, niejednokrotnie produkowany według zaawansowanych technologii, z jednoczesnym uwzględnieniem ograniczeń techniczno-technologicznych, ekonomicznych i geologicznych. Monitorowanie wpływu zjawiska korozji, któremu poddawany jest zestaw przewodu wiertniczego, ma priorytetowe znaczenie na bezawaryjne wiercenie. W kolumnie zestawu wiertniczego umieszczane są tzw. pierścienie korozyjne. Analiza ubytku ich wagi pozwala na bieżące korygowanie składu płuczki, przez dodawanie do niej np. inhibitorów korozji.
Access status: Open Access ,
Nowe technologie wiertnicze stosowane w wierceniach inżynieryjnych
(2006) Wiśniowski, Rafał; Wójcik, Michał; Toczek, Michał
The necessity to have reliable geotechnical data and also to modify the ground qualities has recently created conditions for modernization of old and development of new drilling techniques and technologies. The newest design and technological solutions used worldwide for rotary, rotary-percussion and percussion drilling condition their further development. Attention was paid to the comparison of frequently different technologies enabling drilling and concurrent tripping of pipes. On the basis of distribution of forces acting in the casing, strength conditions were established, thanks to which the physical and geometrical parameters of pipes can be selected.
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).