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Access status: Open Access ,
The methods of pressures prediction based on geophysical data
(2015) Wiśniowski, Rafał; Toczek, Przemysław
Prediction of reservoir pressure and so its values at an early stage of wellbore designing significantly increases the profitability of exploration and production wells design. The prediction of rock mass pressures can be performed in a number of ways. The prediction methods have been reviewed since the 1950s. The methods of empirical forecasting of pressures proposed by Eaton B.A. as well as Hottman and Johnson were described in the paper. The paper also refers to the prediction of rock mass pressures on the basis of seismic well log results obtained from works performed on the same geologic unit. A relation between basic parameters of rocks along the wellbore profile is shown. The Eaton method was used for empirical determining pressure for a planned well based on seismic data form the existing well.
Access status: Open Access ,
Total Specific Energy (TSE) as a new indicator of drilling efficiency
(Wydawnictwa AGH, 2017) Toczek, Przemysław; Wiśniowski, Rafał; Stryczek, Stanisław; Ziaja, Jan; Mazur, Chrystian
Knowing the data from drilling works which had been carried out in a given area gives the opportunity to develop the next borehole with great precision. An important element of the design is to analyze and interpret data in detail, which can be used during the following drilling process. Based on a literature analysis, certain methods of the selection of drill bits have been indicated. Mechanic specific energy curves of drill bits applied in drilling works in northern Poland have been compared. The drilling works took place in the Precambrian platform. The compared mechanic specific energy curves were calculated with the use of R. Teale and H. Rabia equations. A relation between mechanical specific energy and pressure loss in polycrystalline diamond compact drill bits was determined. New drilling ratio TSE - Total Specific Energy which considers hydraulic power energy in the nozzles of the drill bit was calculated.
Access status: Open Access ,
Use of inclined boreholes as injection holes for filling backfill chambers
(Wydawnictwa AGH, 2024) Toczek, Przemysław; Kowalski, Tomasz Wojciech; Artym, Rafał
The latest environmental trends involve the use of renewable energy sources, reducing carbon footprints and minimizing the effects of past human activity. It is therefore very important to minimize the effects of the exploitation of useful minerals by eliminating mining landslides and rock voids. One of the ways to protect them is through drilling works by drilling backfill holes. The authors of the present study show the possibility of adapting diagonal drillings to drill backfill boreholes. It helps to connect voids, caverns or cavities by backfill boreholes through the injection of backfill material into them. The time of pumping the backfill material in the case of vertical and diagonal holes are analyzed.
Access status: Open Access ,
Terrestrial and extraterrestrial drillings in the 21st century. Research challenges and the way to satisfy them by means of a new research infrastructure at AGH-UST
(Wydawnictwa AGH, 2020) Kowalski, Tomasz ; Skrzypaszek, Krzysztof; Teper, Wojciech; Toczek, Przemysław; Złotkowski, Albert
Knowing the impact of technical solutions on the drilling process is a very important element in the process of the exploration of new fossil fuel deposits. Drilling equipment used during drilling operations is highly liable to all conditions which prevail in the well bore. The study of the impact of drilling fluid flow with various rheological properties on the strength and work of drill stem components will allow to search for the best solutions. The article describes the design and construction of two boreholes, fill up with 9 5/8" (244.5 mm) and 24" (609.6 mm) casings. The designed boreholes will be a joint part of the drilling laboratory in the S-1 building at AGH-UST in Krakow. Research The research described above can be done in openholes and implemented at the beginning of the design process for drilling works in new deposits. In addition, it will provide an opportunity for all engineers to get to know the behavior of components operating in an open hole.
Access status: Open Access ,
Investigation of soil conditions in a selected section of a railway cut as a basis for designing geoengineering works to improve their geotechnical parameters
(Wydawnictwa AGH, 2024) Toczek, Przemysław; Kowalski, Tomasz Wojciech; Skrzypaszek, Krzysztof; Cały, Cezary
One approach to enabling construction, engineering, and mining activities in subsoil with insufficient geo-mechanical properties is to employ innovative methods and technologies. These can effectively modify the physical and mechanical characteristics of the subsoil. The article explores engineering techniques that can enhance the geotechnical properties of soils in locations where they exhibit dysfunctions, such as reduced stability and bearing capacity. Additionally, the paper emphasizes the importance of conducting specific geo-engineering tests to accurately assess the geotechnical conditions. The research directly evaluates the stability of a railway section within the Western Carpathians and presents findings from both field and laboratory tests. Given the instability observed in this section, there is a pressing need for geo-engineering reinforcement measures. These efforts aim to enhance the geotechnical properties and safeguard the railway embankment from potential landslides. Detailed accounts of these remedial works will be the focus of a subsequent study.

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