Journal of Geotechnology and Energy
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ISSN 2720-3581
Issue Date
2025
Volume
Vol. 42
Number
No. 2
Description
Journal Volume
Journal of Geotechnology and Energy
Vol. 42 (2025)
Projects
Pages
Articles
Analysis of the possibility of an incorrect shift of the mechanical index of a diaphragm gas meter working under vibration
(Wydawnictwa AGH, 2025) Hofman, Radosław
The article discusses the operation of bellows gas meters, commonly used to measure household gas consumption. It was noted that their testing and certification scope covers laboratory conditions, including work in vibration-free conditions, while vibrations occur in actual situations. It should be noted that the presented analysis is part of analyzing illegal gas consumption – UAG (unaccounted for gas), which is the subject of scientific research both in Poland and globally. The Oil and Gas Institute itself states [1] that it has received approximately 1,400 expert opinions, in which the gas meter user indicated that the counter had been skipped, while laboratory tests of the gas meter did not confirm any irregularities. The author, therefore, addresses the topic by asking whether the design of bellows gas meters with a mechanical counter may contain a design defect that may cause the counter to skip and then “disappear”. As part of the research, an analysis was made of whether vibrations had any impact on the operation of the gas meter, and after confirming the implications, the counter was dismantled, and an attempt was made to determine the causes of the impact of vibrations. Finally, it was indicated what values of forces and acceleration are sufficient to cause measurement errors, and it was recommended that the construction of the counter be modified to prevent this phenomenon from occurring. The conclusions show that if the gas meter is used outside the scope of its certification, the counter may jump. Still, this jump will not leave any mechanical traces, and the gas meter may ultimately function appropriately after the vibrations stop.
The concept of a deep borehole heat exchanger at the AGH University Student Campus
(Wydawnictwa AGH, 2025) Kunasz, Remigiusz; Śliwa, Tomasz; Sapińska-Śliwa, Aneta
The paper provides an introduction to deep borehole heat exchangers, their use and completed projects worldwide. The aim of the study is to design a deep borehole heat exchanger at the AGH University Campus, more specifically its design, casing and internal heat exchanger pipe concept with a view to minimizing temperature losses. It goes on to describe the location of the project, including the geology of the area and the solution to the design problem, i.e. the casing of the borehole and the design concepts for the deep borehole heat exchanger. In the following section, the design of a deep borehole heat exchanger is presented. During the research, the main problem was the limited availability of articles on deep borehole heat exchangers. This is due to the continuous development and testing of new engineering ideas and the high implementation costs compared to the energy effects obtained. The publication only deals with technical issues, financial issues were not considered, among other things due to the current global geopolitical situation in 2023.
The impact of reservoir parameters and well construction on gas well productivity
(Wydawnictwa AGH, 2025) Blicharski, Jacek; Dybaś, Izabela
The aim of this paper was to present the influence of selected reservoir parameters and well construction on the productivity of a gas well, using the example of a natural gas reservoir with high nitrogen content. Data from an exemplary well were used to carry out a variant assessment of the productivity of wells at different stages of reservoir exploitation, taking into account single- and two-phase gas-condensate mist flow in the well. The reservoir development process is briefly described at the beginning. Subsequently, the issues of gas inflow to the well, gas flow in the well and nodal analysis were discussed. The last part of the paper focuses on the variant assessment of the productivity at different stages of reservoir exploitation using a computational algorithm for single-phase and two-phase gas-condensate mist flow in the well.