Production completion of wells at the Ivanić oil field within EOR project : master’s thesis

Zbog starenja i visoke razine iscrpljenosti naftnih ležišta u Republici Hrvatskoj, tercijarne metode pridobivanja postaju sve značajnije. Prvi takav projekt realiziran je na naftnom polju Ivanić čiji koncesionar je hrvatska naftna kompanija INA d.d.. Ovaj diplomski rad se sastoji od kratkog pregleda rada polja Ivanić kroz povijest i opisa EOR projekta, analize uzroka i učestalosti remonata bušotinske opreme, opisa korozije uzrokovane povećanom koncentracijom otopljenog ugljikovog dioksida i načina sprječavanja pojave štetnih učinaka iste. Naposljetku, nabrojene su moguće prilagodbe proizvodne opreme bušotinskim uvjetima koje bi imale pozitivan učinak na smanjenje broja remonata i povećale proizvodnu učinkovitost bušotina naftnog polja Ivanić.Tertiary methods of oil recovery are becoming ever more important in the Republic of Croatia because of high depletion and maturity of oil fields. The first EOR project in Croatia was implemented at the Ivanić oil field by the Croatian oil company INA d.d.. This thesis consists of a review of the production history of the Ivanić oil field, description of the EOR project, analysis of causes and frequency of workovers, review of corrosion caused by increased concentration of dissolved CO2 and ways to prevent its damaging effects. Finally, possible adjustments of the production equipment regarding the conditions in the well are reviewed. Those adjustments would have positive effects on the production efficiency of the production wells and lead to a decrease in the number of workovers