Browsing by Author "Macuda, Małgorzata"

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Access status: Open Access ,
Drilling large diameter intake wells with cutter bits in loose and weakly consolidated rocks
(2016) Macuda, Jan; Macuda, Małgorzata
Most of the useful aquifers in Poland occur in the Quaternary and Tertiary horizons, which are deposited at a depth of tens to hundreds of meters. Owing to the need of providing large quantities of water for municipal and industrial purposes, the aquifers are more and more frequently opened with large diameter wells of various designs. Such wells are mostly drilled with the rotary method with reverse mud circulation with the use of various bits. The Quaternary and Tertiary strata abound in loose and weakly consolidated rocks therefore cutter bits are predominantly used. They allow for high rates of drilling and shorter time of drilling of the well. This significantly influences the negative influence of drilling mud on the near screen zone of the aquifer and better hydraulic properties of the well. Drillability tests were performed with cutter bits of 0.86 and 0.67 m diameter for providing high rates of drilling of large diameter intake wells in loose and weakly consolidated rocks. The research was made for measurement sections 0.5 to 1.0 m long, and each of them was drilled at con- stant rotational velocity and axial weight on bit. Prior to the drillability tests the limitation of weight on bit and rotational velocity of bit imposed by the technical characteristic of Prakla B50 rig, strength of the string and butter bit were established. Various regression models were analyzed for the sake of finding a dependence between drilling rate and axial weight on bit and rotational velocity of bit for particular macroscopically homogeneous layers. The best results were obtained for the exponent model illustrating the influence of axial weight on bit and rotational velocity of bit on the drilling rate, which has been proved by the calculated regression coefficients and statistical parameters.
Access status: Open Access ,
Drilling large diameter water wells in carbonate strata in the Lublin area
(Wydawnictwa AGH, 2018) Macuda, Jan; Macuda, Małgorzata
One of the most important sources of water for communal purposes in the Lublin area are the useful groundwater aquifers intaken with deep drilled wells. Such wells should be highly efficient and localized in a close vicinity of the local water supply network to lower the cost of transport. Large amounts of water can be produced by large diameter wells, where heavy duty pump aggregates can be installed. High rates of penetration cannot be obtained if the profile abounds in hardly drillable carbonate. This elongates the time of drilling and increases negative impact of mud on the near well zone of the aquifer. It also lowers hydraulic parameters of the well. To improve the efficiency of the wells, drillability tests with cogged bits were performed in carbonate rocks to optimize the mechanical parameters of drilling. Measurement sections, each 0.3 to 0.5 m long, were selected for the tests. Each section was drilled at constant rotational speed and weight of bit values. Prior to the drillability tests, the limits on the weight of bit and rotational speed of the bit were established, in line with the technological characteristic of rig Wirth B3A, strength of the string and of the cogged bit.
Access status: Open Access ,
Zanieczyszczenie środowiska gruntowego substancjami ropopochodnymi na terenach rafineryjnych
(2007) Macuda, Jan; Macuda, Łukasz; Macuda, Małgorzata; Rogowska-Kwas, Renata
Niekontrolowane wycieki węglowodorów są istotną ingerencją w środowisko gruntowe. Hamują one wymianę gazową, ograniczają dostęp światła, zmniejszają stężenie rozpuszczonego tlenu, zanieczyszczają glebę i grunty, zaburzają homeostazę, a przede wszystkim mają działanie toksyczne, mutagenne i kancerogenne na wszystkie organizmy żywe. W artykule przedstawiono wyniki badań stanu jakościowego środowiska gruntowego w rejonie instalacji petrochemicznych w zakresie zawartości w nich węglowodorów. Na podstawie porównania wyników badań geochemicznych do wartości progowych zawartych w rozporządzeniu Ministra Środowiska dotyczących standardów jakości gleby i ziemi stwierdzono, że gleby i grunty na terenach rafineryjnych są zanieczyszczone substancjami ropopochodnymi ponad dopuszczalne wartości, co kwalifikuje je do oczyszczania.