AGH Drilling, Oil, Gas
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ISSN 2299-4157
e-ISSN: 2300-7052
Issue Date
2018
Volume
Vol. 35
Number
No. 2
Description
Journal Volume
AGH Drilling, Oil, Gas
Vol. 35 (2018)
Projects
Pages
Articles
Assessment of integrity of operating gas pipelines
(Wydawnictwa AGH, 2018) Ładecki, Bogusław; Matachowski, Filip; Bednarz, Stanisław
Gas pipelines that have been in operation for many years require supervision, taking into account the places and conditions of their usage. The currently applicable normative regulations do not fully determine the scope of the integrity control of such gas pipelines. The standards provide general guidelines for monitoring corrosion phenomena in pipelines, allowing the use of simplified strength patterns based on a flat state of stress, in actuality, real objects usually have complex three-dimensional structures. Such an approach may be a reason for committing significant errors in determining the state of stresses and strains in the construction of pipelines, which is a significant problem in assessing the integrity of pipelines (when combined with the lack of a formulation of the appropriate admission criteria). This paper presents a methodology for assessing the integrity of pipeline structures operating at ambient temperatures based on conducting comprehensive measurements of wall thickness defects (in connection with performing necessary defectoscopy tests). The results of these measurements and non-destructive tests are the basis for the analysis of stress strength and MES deformation based on the verified real geometry as well as the method of supporting the pipelines. The information obtained on this basis regarding the pipeline structure areas of the highest efforts is the basis for selecting the critical areas of pipeline construction for which they should be repaired or modernized, or a monitoring program should be developed using non-destructive tests.
Fractal analysis of sandstone pore space geometry
(Wydawnictwa AGH, 2018) Figiel, Michał; Lewandowska-Śmierzchalska, Joanna
Fractal analysis is currently one of the fastest evolving branches of science. Numerous objects in nature exhibit a fractal structure. Additionally, the vast majority of rocks - especially reservoir rocks - take the form of a fractal. Computer image analysis based on thin-section images has been used for examining the fractal structure of pore spaces, directly applying the definition of the fractal box-counting dimension. For the examined sandstone sample, thin sections were made and photographed, and the corresponding values of the fractal dimension and lacunarity were calculated. Each of the photos was encompassed by porosity that was calculated based on the number of pixels. Furthermore, the volatility of the fractal dimension and lacunarity were studied as well as their relationships with the porosity. A correlation analysis between the fractal parameters and the porosity was carried out. The results were compared with the data obtained from a mercury porosimetry of the same sample of sandstone.
Cooperation agreement as legal instrument stimulating hydrocarbon exploration and production in Poland
(Wydawnictwa AGH, 2018) Stachera, Michał
The oil and gas industry in Poland is burdened with relatively high investment risk. The main reason for this is the complex geology and relatively medium-sized resources that do not guarantee a return on an investment. The above factors have led to the necessity of sharing the risk to minimize the negative financial effect of the investment, which has resulted in the more and more frequent cooperation of several entities towards the realization of a specific project. The »shale revolution« has significantly contributed to the evolution of legal regulations in this area, i.e., the implementation of the act of June 9, 2011 - Geological and Mining Law (Journal of Laws of 2014, Item 1133). It introduces the concept of »cooperation agreement« for the purpose of the joint use of rights and execution of concession obligations in respect to the exploration and prospecting of hydrocarbon deposits as well as the extraction of hydrocarbons from deposits. In the article, the author intends to show that, contrary to the generally prevailing opinion, the new act of June 9, 2011 - Geological and Mining Law (Journal of Laws of 2011, No. 163, Item 981) was not only aimed at increasing state control over the activity in the field of exploration and production, but on the contrary - it was aimed at liberalizing the market and stimulating domestic and foreign entities to engage in exploration and production activities in Poland. The article presents a new and original approach in light of the interpretation of legal regulations based on which hydrocarbon exploration and production activities are carried out in Poland.The author uses the formal-dogmatic analysis method (otherwise known as the logical-linguistic analysis method) to clarify the archival, current, and abandoned legal acts pertaining to the macroeconomic environment. This method is well-known in law research.