Matuła, Rafał
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inżynieria środowiska, górnictwo i energetyka
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Item type:Article, Access status: Open Access , The study of unsteady operation mode of the crude oil trunk pipeline in case of a sudden stop flow(2017) Fąfara, Zbigniew; Mazur, Roman; Matuła, RafałMedia pipeline transportation, in particular energy commodities has a very high share in the world economy. It has many advantages over other methods of transmission of the products on land but there are concerns about the safety of the pipeline system. When we are designing the pipeline, we take into consideration maximal discharge pressure of medium, but any change in pumping parameters results the appea rance of an unsteady (transient) process, which in some cases may lead to a rapid increase in pressure. The largest increase in pressure in the pipeline comes at a time of a complete stop fluid flow. There is formed a water hammer, which may cause a major accident up to pipeline leaks inclusive. Subject of considerations in the paper is the analysis of changes in pressure over time in the pipeline obtained in 12 experiments of stop oil pump unit in the trunk pipeline for different pumping parameters and properties of the medium. Based on the recorded changes of pressure in measurement points were fitted regression models allowing to forecast an increase in pressure along the pipeline route caused by water hammer.Item type:Article, Access status: Open Access , Fault zone imaging based on refraction seismic surveys(Wydawnictwa AGH, 2014) Matuła, RafałItem type:Article, Access status: Open Access , Geomechanical characterization by estimating the Vp/Vs ratio of sedimentary rock samples(Wydawnictwa AGH, 2019) Matuła, Rafał; Lewandowska-Śmierzchalska, Joanna; Fąfara, ZbigniewThe velocity ratio V$_{p}$/V$_{s}$ and elastic parameters are effective quantities for describing various physical parameters and lithological properties of rock samples. Ultrasonic measurement was used to evaluate the V$_{p}$/V$_{s}$ ratio. Ultrasonic velocity estimation is widely used in the quantitative evaluation of rock materials. Ultrasonic P and S-wave travel times were studied in one direction of cylindrical core samples with a length and diameter of 100 mm. Wave velocity analysis was carried out on 20 crystalline drill cores taken at depths ranging from 10 m to 80 m. The cores were then tested for their ultrasonic velocity. The studied samples were also geomechanically characterized using ultrasonic testing. In this paper, the method used and a brief description of the measurement geometry are presented. The results of the calculations of P and S wave velocities, V$_{p}$/V$_{s}$ ratio, Young's modulus and Poisson's coefficient are given. Finally, the studied samples were geologically classified and the V$_{p}$/V$_{s}$ ratio was discussed.Item type:Article, Access status: Open Access , Recent developments of non-direct methods of pipeline and leak detection(Wydawnictwa AGH, 2018) Fąfara, Zbigniew; Lewandowska-Śmierzchalska, Joanna; Matuła, Rafał; Lewińska, PaulinaIndustrial pipelines are used as a low-cost method of transport of various types of substances. In the last decades the number of transmission and distribution pipelines increased considerably, leading to an increased number of failures and rising the need for better and more accurate non-destructive methods of their detection and prevention. Leakage in pipeline networks causes a loss of valuable resources in the form of oil and gas. Repairing the infrastructure requires significant additional financial resources. Therefore, any damage to the pipeline network must be detected and repaired as soon as possible. Indirect methods for leak detection and localization uncover the presents of leaks from outside the pipeline by visual observation or by using appropriate equipment. Pipelines are often underground installations or run for many kilometers in areas where there are no roads, and access is extremely difficult or impossible. The underground occurrence of pipelines makes regular inspection difficult. It is also not possible to examine all pipeline sections simultaneously. Pipeline preventive maintenance or replacement program should be conducted based on detailed assessment of its technical and environmental conditions. Thus, safe and non-destructive techniques are needed, which would allow for pipeline periodical inspection without disturbing their operation.Item type:Article, Access status: Open Access , Ecological risk associated with the onshore hydrocarbon deposits exploration(2017) Uliasz-Misiak, Barbara; Lewandowska-Śmierzchalska, Joanna; Matuła, RafałOil and natural gas exploration is performed using geophysical methods and drilling works. In areas initially identified as prospective for the occurrence of accumulation oil or natural gas based on the analysis of geological data carried out geophysical surveys. The aim of this works is to identify geological structures that could constitute hydrocarbons traps. In the case of finding the appropriate structures, the next stage of exploration work is drilling well for further recognition of the structure. These works allow to explore not 12 only the geological profile but also the physico-chemical properties of drilled rocks and reservoir fluids. Geophysical (mainly seismic) surveys and drilling works can affect the individual elements of the environment: the atmosphere, underground and surface water, ground surface and land and rock environment in different degrees. In order to estimate the risks, threats to all elements of the environment related to the prospection of hydrocarbon deposits have been analyzed (seismic and drilling works). Environmental risk is estimated based on a modified methodology contained in the norm PN 18002. For risks associated with the exploration referred to the consequences of adverse events in relation to the individual elements of the environment and the frequency thereof (by determining the probability of their occurrence). The risk was estimated by multiplying the weight of the likelihood of adverse events weights and consequences. Risk evaluation, indicating danger tolerated, acceptable and unacceptable was also evaluated.Item type:Article, Access status: Open Access , Oil pipeline leak detection using GPR method - simple case study(Wydawnictwa AGH, 2018) Fąfara, Zbigniew; Lewandowska-Śmierzchalska, Joanna; Matuła, RafałModelling experiment was used to investigate the abilities of using ground penetrating radar (GPR) to detect oil leaks in the underground pipeline system. Leaks not only waste precious natural resources but also create substantial damage to the transportation system within urban environments. Surface geophysical methods are noninvasive tools used to characterize the changes in the physical properties of the subsurface material. This characterization, in consequence, is used to interpret the geological and hydrogeological conditions of the strata. GPR is a reflection-based technique which uses high frequency electromagnetic waves to acquire subsurface information. GPR responds to changes in electrical properties, which are a function of soil and rock material and moisture content. A simple experiment was conducted to determine the validity and effectiveness of GPR technology in detecting leakage in metal pipelines. Initially, a prototype model was designed to simulate a pipe leak. A 1.5 GHz antenna modeling mode was used to collect GPR data. The test was modelled using sandy soil material that is representative for pipelines construction. Also model simulations are being used to select an appropriate equipment configuration (frequency band, type of antenna and real-time imaging software) prior to data acquisition.Item type:Book Chapter, Access status: Open Access , Prędkość rozchodzenia się w rurociągu fali ciśnienia powstałej po uderzeniu hydraulicznym(Wydawnictwa AGH, 2024) Fąfara, Zbigniew; Matuła, RafałThe paper presents the results of a study of the propagation speed of the internal pressure increase wave created by the hydraulic hammer caused by a stoppage of the flow of crude oil in a section of the trunk transmission pipeline “Druzhba”. The results of pressure measurements in a section of one line of the 103.5-kilometer-long pipelines, at five measurement points, were analyzed. The preassure was recorded continuously every second. The analysis included nine events occurring in one year, when one of the pump stations was stopped. Practice shows that hydraulic hammers occurring in such a situation in pipeline systems transporting liquid media are the most common cause of their failure. The results of direct measurements of pressure changes inside the analyzed section of the pipeline accompanying the stoppage of the flow of crude oil indicate an up to three-fold increase in the pressure of the transported medium at the entrance of the stopped pump station, which is particularly dangerous and may result in leakage of the “Druzhba” pipeline. It was built 60–70 years ago, so it’s safe operation is now a very important issue.