Application of the Prosper program in determining the production opportunities of horizontal well on the North Adriatic exploration field : master’s thesis

Na eksploatacijskim poljima na sjevernom dijelu Jadrana, koja se nalaze uz samu granicu Hrvatske i Italije, nalazi se 19 proizvodnih i jedna kompresorska platforma, s ukupno 52 proizvodne bušotine na nekoliko plinskih polja. Prema objavljenim podacima i tehničkoj dokumentaciji INA-e, predviđena je dinamika pridobivanja plina na pojedinim poljima do 2025. godine. Uz pretpostavku o ukupnim količinama proizvedenih fluida na pojedinim bušotinama, proračunat je i očekivani pad tlaka u ležištu. Temeljem ovih podataka odabrana je tipska horizontalna bušotina na plinskom polju Ika za postavljanje cjelokupnog proizvodnog modela bušotine u programu Prosper. Modelom će se na osnovu odgovarajućih ulaznih podataka odrediti proizvodne mogućnosti bušotine, što uključuje proračun dinamičkog tlaka na dnu bušotine, odnosno postavljanje IPR krivulje, kao i proračun gradijenata pada tlaka u uzlaznim cijevima. Time je modelirana radna točka proizvodnog sustava koja odgovara optimalnim proizvodnim uvjetima. U radu će se usporediti rezultati dobiveni pojedinim modelima za utok fluida iz ležišta u horizontalnu bušotinu koji se koriste u programu Prosper i obrazložiti ključne teoretske postavke ovih modela.On the exploitation fields in the northern part of the Adriatic, located just along the border between Croatia and Italy, there are 19 producing and one compressor platforms, with 52 production wells on several gas fields. According to published data and INA technical documentation, the dynamics of gas production in certain fields are planned until 2025. Assuming the total amount of fluid produced on individual wells, the anticipated drop in pressure in the reservoir is also calculated. Based on these data, a typical horizontal well on the Ika gas field was selected to set the entire production model of the well in the Prosper program. The model will be based on the appropriate input data to determine the borehole production potential, including the dynamic pressure calculation at the bottom of the well, regarding the setting of the IPR curve, as well as the calculation of the pressure drop in the tubing. This is a modeled solution point of the production system, which corresponds to optimal production conditions. The paper compares the results obtained utilizing individual fluid flow models from the wells in the horizontal borehole used in the Prosper program and outlines the key theoretical properties of these models