Konstrukcija zdenaca s reduciranom dužinom sita na crpilištu Vinogradi

master's thesis

• Title: Konstrukcija zdenaca s reduciranom dužinom sita na crpilištu Vinogradi : diplomski rad
• Title (english): Construction of wells with reduced well screen length on the wellfield Vinogradi : master's thesis
• Author: Lidija Miličević
• Mentor: Željko Duić (mentor)
• Committee member: Željko Duić
• Committee member: Jelena Parlov
• Committee member: Kristijan Posavec
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Geology and Geological Engineering); Zagreb
• Defense date and country: 2013-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Geological Engineering

Abstract

Crpilište Vinogradi u Osijeku najveće je crpilište u Hrvatskoj gdje je voda zahvaćena iz pješčanih vodonosnika. Za podzemne vode crpilišta Vinogradi karakteristična je umjereno reduktivna sredina posljedica čega je povišen sadržaj otopljenog željeza u vodi, što pogoduje razvoju željezovitih bakterija koje stvaraju veliku količinu materijala koji se vrlo brzo širi, zatvarajući otvore na situ, u šljunčanom zasipu i pornom prostoru sloja u neposrednoj okolini zdenca reducirajući pritom specifičnu izdašnost zdenaca. Na zdencima crpilišta Vinogradi gotovo dvadeset godina analiziraju se svi čimbenici i testiraju različiti načini uklanjanja materijala istaloženog djelovanjem željezovitih bakterija. Kao jedan od razmatranih čimbenika je i dužina sita. U ovom radu, vodeći se literaturnim podacima te saznanjima o iskustvima s ranije izvedenim zdencima željelo se prikazati kako na vijek trajanja zdenaca i njegovu učinkovitost može utjecati ugradnja reduciranih ukupnih dužina sita prema kriteriju graničnih ulaznih brzina.

Abstract (english)

Abstract: The well-field Vinogradi in Osijek is the largest well-field in Croatia, where the water is extracted from the sandstone aquifer. A characteristic of the groundwater of well-field Vinogradi is an anoxic environment, which results in an increased level of dissolved iron in water. These conditions are suitable for a rapid growth of iron bacteria which are responsible for the production of a large quantity of very pervasive material that closes the perforations of a screen and gravel pack in the immediate vicinity of the well, causing the reduction of the well capacity. For almost twenty years, various factors have been analysed at the well-field Vinogradi and many different ways of removing the sedimented material have been tested. One of the factors discussed is also the length of the screen. Using the data from previous works and knowledge about earlier experience in well-making, this thesis is supposed to show that the duration and efficiency of wells can be affected by the installation of reduced screen lengths according to the entrance velocity criterion.

• Keywords: crpilište Vinogradi; zdenac; željezo; željezovite bakterije; dužina sita; ulazna brzina
• Keywords (english): well-field Vinogradi; well; iron; iron bacteria; well screen lenght; entrance velocity
• Language: croatian
• URN:NBN: urn:nbn:hr:169:987586
• Study programme: Title: Geological Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka geološkog inženjerstva (magistar/magistra inženjer/inženjerka geološkog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2016-01-19 10:41:14