Browsing by Author "Knez, Janusz"

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Access status: Open Access ,
Influence of drilling direction on wellbore stresses
(2011) Knez, Dariusz; Megao, Eddie; Knez, Janusz; Śliwa, Tomasz
The transposed in-situ stress state relative to the borehole coordinate system (Cartesian borehole coordinate system) and the total stress component at the borehole wall (cylindrical coordinate system) exhibits cyclic behaviour with respect to drilling direction of borehole with respect to delta/H, Beta. On the other hand, with varying borehole inclination, a, the stress either increases or decreases with increasing a angles. Consequently the effective maximum, delta1 and average, delta2 principal stresses exhibits the same behaviour. It can be concluded generally that the effective principal stress state of a wellbore would vary in a cyclic behaviour and would have a maximum and minimum stress points. From these observations, it is obvious that in any situation, optimal combinations of alpha and Beta will have to be established before drilling is commenced in order to optimise stability of the borehole.
Access status: Open Access ,
Modelling of the system for cleaning up free oil products with the application of the MARS simulator
(2013) Knez, Janusz; Knez, Dariusz
Nowadays one of the most important problems in environmental protection is the pollution of groundwater by derivative products of oil. A common case of the infiltration of the oil derivative products to the ground water system is mainly connected with accidental oil spills in various types of environmental conditions. In this case we encounter numerous types of problems connected especially with the pollution in: 1) aeration zones, 2) saturation zones. The first step is a conceptual model for the proper recognition of the type and scale of the problem. After making a conceptual model it is possible to take a preliminary decision to recognize what sort of pollution is the source of the environmental problem. A study example describes modeling of free products of oil (LNAPL) floating on the groundwater table using MARS (Multiple Areal Remediation Simulator). The multiphase model was made on the basis of theoretical model concepts. In the modeling the recovery and migration of LNAPL are simulated, and the recoverable and residual spill volumes of derivate products of oil are estimated. Modeling indicates the best location of the remediation system and the pumping wells. Additionally, modelling can be applied to manage the remediation system for improving the efficiency and for decreasing the catchment area of piezometers and wells
Access status: Restricted ,
Ocena migracji benzenu w wodach podziemnych na podstawie badań modelowych w wybranym obszarze zbiornika GZWP 417 Kielce
(Data obrony: 2006) Knez, Janusz
Wydział Geologii, Geofizyki i Ochrony Środowiska
Celem pracy było: Dobranie odpowiedniej metodyki postępowania w przypadku zanieczyszczenia wód podziemnych węglowodorami aromatycznymi pozwala to na lepsze zrozumienie procesów zachodzących w przyrodzie i pokazuje kierunki dalszych działań naprawczych. Zastosowanie zaawansowanego modelowania numerycznego systemu przepływu i migracji jako użytecznego narzędzia do właściwej oceny stanu i prognozy zachowania się zanieczyszczeń.
Access status: Open Access ,
Rozpoznanie zanieczyszczenia wód podziemnych węglowodorami aromatycznymi w rejonie stacji paliw PKN ORLEN Kielce-Białogon
(2009) Knez, Janusz; Knez, Dariusz
Petrochemicals released from ZGPN CPN caused contamination of underground water. Benzene is most representative part and for this reason its paths were investigated. To prove simulation results wellbore was drilled and water samples were investigated. Laboratory measurements confirms computer simulation results.
Access status: Open Access ,
The influence of chosen calculation parameters on the total volume of the LNAPL product estimated in a mathematical model
(2014) Knez, Janusz; Knez, Dariusz
There is a number of mathematical models applied to simulate the migration of oil-derived pollution, with the LNAPL (Light non-aqueous phase liquid) volumes in the saturation and aeration zones being analysed in two-phase modeling. A number of hydrogeological parameters and the parameters describing the second phase consisting of oil derivatives are assumed for the sake of the simulation. A part of the data predetermined for the mathematical model is applied on the basis of direct investigations in the field or laboratory, whereas some data are based on a literature analysis or are used by analogy to similar areas. The model data should be additionally verified and validated in the mathematical model. In the case of the LNAPL remediation system being simulated, it is the parameters related to the ground-water environment and the parameters defining the free product of oil that are very important in determining the volume of the recovered LNAPL. With a good deal of data applied for the remediation process simulation one may expect model solutions of different levels of reliability.