Investigation of crude oil and produced water properties on chalk surface wettability alteration
Authors
Franic, Frida ; Konstantinos, Sapounas
Term
4. term
Education
Publication year
2018
Submitted on
2018-06-07
Pages
79
Abstract
Dette studie tester råolier fra den danske del af Nordsøen (Halfdan-feltet) med forskellige syretal (et mål for mængden af syreholdige forbindelser i olien) sammen med Valhal formationsvand, anvendt som aldringsvæske ved 115°C. Vi bruger Modified Flotation Test (MFT), en laboratoriemetode til at undersøge olie–brine–bjergartsinteraktioner og vætbarhed (om kalkoverfladen foretrækker vand eller olie). Vi fremstillede forskellige fortyndinger af produceret vand (saltvand fra reservoiret) for at justere Dan-kalkens vætbarhed ved at sænke saltholdighed og ionstyrke. Dermed kunne vi teste flere kombinationer af råolier og saltvand med forskellige egenskaber og deraf forskellige reaktivitetstendenser over for kalkoverfladen. Vi analyserede både olie- og saltvandsegenskaber for bedre at forstå de mekanismer, der driver vætbarhedsændring.
This study tests crude oils from the Danish North Sea (Halfdan field) that differ in acid number (a measure of acidic compounds in the oil) together with Valhal formation water used as an ageing fluid at 115°C. We apply the Modified Flotation Test (MFT), a laboratory method to probe oil–brine–rock interactions and wettability (whether the rock surface prefers water or oil). We prepared different dilutions of produced water (saline reservoir water) to adjust the wettability of Dan chalk by lowering salinity and ionic strength. This enabled us to test multiple combinations of crude oils and brines with distinct properties and, consequently, different reactivity toward the chalk surface. By analyzing both oil and brine properties, we aimed to clarify the mechanisms that drive wettability alteration.
[This abstract was generated with the help of AI]
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