Comparison of different methods for analysis of wettability and relative permeability of rocks and their influence on the oil recovery from the new oil reservoir in the Sava Depression : master’s thesis

Laboratorijski je (INA d.d., Služba istraživanja stijena i fluida) ispitivan niz uzoraka jezgre stijene kako bi se jednoznačno odredilo močivost i relativnu propusnost i odabralo reprezentativne podatke za analitičke i simulacijske procjene zavodnjavanja ležišta u Savskoj Depresiji. Ispitana je nova metoda ispitivanja močivosti (dizanje u jezgri, engl. Rise in Core), uspoređena s Craigovim kriterijima močivosti te su također ispitivane močivosti Amottovim testom upotrebom laboratorijskog ulja broj 1, čime je ustanovljeno da preporučeno ulje broj 1 nije prikladno za analize močivosti. Na istim uzorcima su zatim analizirane i uspoređene relativne propusnosti metodama ustaljenog i neustaljenog stanja, mjerene odabranim uljem. Detaljno je opisan postupak mjerenja i interpretacije laboratorijskih podataka. Usklađivanjem je postignuto dobro poklapanje sa simulacijskim modelom jezgre, međutim za primjenu u simulaciji na razini ležišta kao reprezentativna izdvojena je krivulja relativnih propusnosti mjerena metodom neustaljenog stanja.A number of rock core samples were investigated in the Laboratory (INA d.d., Rock and Fluid Research Service) to determine the wettability and relative permeability as well as selected representative data for analytical and simulation estimations of waterflooding reservoir in the Sava Depression. A new Rise in Core test was studied, compared to Craig's wetness criteria, and the wettability was also determined by Amott Test using laboratory oil No. 1. It was discovered that recommended oil No. 1 was not suitable for wettability analysis. The same samples were then analyzed and relative permeability was measured by using selected oil in steady-state and unsteady-state method. The method of measurement and interpretation of laboratory data is described in detail. Good matching was achieved using the simulation model of the core. However, relative permeability curve, measured using the unsteady-state method was chosen as representative for simulation at the level of the reservoir