Tehnologija napuštanja bušotina

master's thesis

• Title: Tehnologija napuštanja bušotina : diplomski rad
• Title (english): Well plugging and abandonment : master's thesis
• Author: Ante Samardžić
• Mentor: Nediljka Gaurina-Međimurec (mentor)
• Committee member: Nediljka Gaurina-Međimurec
• Committee member: Katarina Simon
• Committee member: Zdenko Krištafor
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Petroleum and Gas Engineering and energy); Zagreb
• Defense date and country: 2012-07-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Petroleum Mining

Abstract

Postavljanje cementnih čepova u procesu napuštanja bušotina je od velike važnosti za zaštitu podzemnih i površinskih voda. Uspješnost napuštanja bušotine se očituje u sprječavanju migracije nafte, plina ili ostalih štetnih tvari u vodonosnike. Proces napuštanja bušotina reguliran je zakonskim propisima. Za uspješno projektiranje procesa napuštanja bušotine potrebno je razmotriti sve aspekte tog procesa kao što su: mjesto postavljanja čepa, kontrola slojnog tlaka, stanje bušotine, postavljanje i stvrdnjavanje cementnog čepa, uspostavljanje statičkih uvjeta u bušotini, raspoloživost opreme i troškovi. Pravilno postavljanje cementnih čepova zahtijeva odabir odgovarajuće metode te njeno pravilno korištenje. Postoji metoda uravnoteženja stupca cementne kaše, metoda pri kojoj se koristi cementacijski paker, metoda pri kojoj se koristi cementacijska žlica te metoda s primjenom dva čepa. Odabir metode za postavljanje cementnih čepova ovisi o: mjestu postavljanja čepa, stanju te konfiguraciji bušotine. Za sprječavanje zagađenja cementne kaše isplakom koriste se: grebači i centralizeri, tekućine za ispiranje te razdjelni fluid. Nakon što su cementni čepovi postavljeni kolona zaštitnih cijevi se reže najmanje 1,5 m ispod razine tla, a na vrh odrezane kolone navaruje se zaštitna ploča.

Abstract (english)

Abstract: The plugging and abandonment of oil and gas wells is an operation that is critical for protection of underground and surface waters. Proper plugging procedures must be followed to effectively block the migration of oil, gas and other detrimental substances into freshwater aquifers. An effective well-abandonment plan must address all aspects of abandonment process such as: plug location, control formation pressure, conditions of the well, positioning and solidification of the plug, establishing static well conditions, equipment availability and expense. Proper placement of cement plugs requires the selection and proper education of an appropriate method. The methods include the balance, cement retainer, dump bailer and two-plug method. The selection of a method for setting each plug is influenced by a number of factors, including the position of the plug and the well condition and configuration. For prevention of cement contamination scratchers and centralizers, prewashes and spacer fluids have been used. After the cement plugs are placed, casing should be cut at least 1,5 below ground level and on the top of the casing a cover plate have to be welded.

• Keywords: cementacija; cementni čep; napuštanje bušotina
• Keywords (english): cementing; cement plug; well abandonment
• Language: croatian
• URN:NBN: urn:nbn:hr:169:057273
• Study programme: Title: Petroleum engineering; specializations in: Petroleum engineering, Energy production and supply, Environmental protection in petroleum engineering; Course: Petroleum engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka naftnog rudarstva (magistar/magistra inženjer/inženjerka naftnog rudarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2016-03-16 11:03:18