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Muhammad Adeel Nasser Sohals, Department of Chemistry and Bioscience, will defend his thesis on "Enhanced Oil Recovery Based on Ionically Modified Water in Carbonates".
13.01.2017 kl. 13.00 - 16.00
"Enhanced Oil Recovery Based on Ionically Modified Water in Carbonates"
The wettability alteration process depends on the formation water composition, crude oil chemistry, reservoir temperature, rock surface mineralogy and composition of the injected water. The study of all the parameters is important to understand their role in wettability alteration mechanisms, but injected water chemistry is the only that can be tuned at reservoir scale. Therefore, this study principally focused on the investigation of water chemistry effects on wettability including: a) effect of potential scale forming ions on initial wetting conditions, b) effect of ionic composition and strength, c) influence of temperature, d) impact of oxyanions concentration, and e) interfacial tension.
This study used flotation to measure wettability. Comparisons of wettability trends measured by flotation with imbibition showed flotation produced similar results. The experiments used Dan chalk, reservoir oil and synthetic brines were performed at 23, 50 and 100oC. The flotation technique directly measures the wettability and physically separates oil-wet rock from water-wet rock. The resulting measurement is expressed as % water-wet grains. A flotation wettability index (FWI) was defined and works in the same way as Amott wettability index by expressing the wetting condition with a numerical value between completely oil-wet (-1) and water-wet (+1). The technique also allows determination of the amount of oil retained on water-wet surfaces after wettability alteration. The retained oil offers additional information on the wettability alteration mechanisms compared to other wettability measurement techniques.
The experimental results show that changing water chemistry can improve the oil wetness or water wetness. The first effect, improving oil wetting, was found to be associated with an ionic composition, specifically addition of oxyanions, while reducing the ionic strength (dilution) improved the water-wet conditions of the crude-oil-brine (CBR) system. The addition of the oxyanions sulfate and borate shifted the wettability to more oil wet. All the brines had Ca and Mg present so we could not isolate any specific effects associated with the cations. Sulfate was temperature sensitive with little shift at 23 and 50oC as concentration increased, but at 100oC the wettability shift was pronounced from neutral to oil wet. Borate showed less temperature sensitivity and less ability to shift wettability. The wettability shift for both oxyanions was proportional to concentration. Dilution of the brines increased the water-wet conditions up to 10-fold dilution, but further dilutions did not increase water wetting. Dilution changed wettability for formation brines from -0.50 to -0.75 (oil-wet) to -0.25 & 0.0. Increase in temperature shifted the CBR system towards more oil-wet for all the brines tested including the brines without sulfate or borate. The wettability shifted from near neutral-wet to more oil-wet conditions when the temperature increased from 23oC to 100oC. The temperature effect was different depending on oxyanion. Sulfate showed no temperature effect between 23 and 50oC, but showed significant shifting at 100oC with greater shift to oil wet with increasing sulfate concentration. In contrast, borate showed a systematic increase in oil wetting as temperature increased.
The interfacial tension (IFT) between crude oil and advanced fluids was measured at 23 and 90oC. IFT increased for seawater and seawater without sulfate as temperature increased from 23oC to 100oC, but decreased for seawater with borate. The dilutions of all the brines increased the IFT at constant temperature. The lowest IFT was 11.5 mN/m, which is not low enough to improve oil recovery independently without wettability alteration.
Ph.D. and Project Manager, Vural Sander Suicmez, Maersk Oil and Gas A/S, Copenhagen K, Denmark
Department of Chemistry and Bioscience, Section of Chemical Engineering
Niels Bohrs Vej 8, 6700 Esbjerg
27.09.2017 kl. 09.00 - 16.30
In honor of Professor Jane Parpart’s many years of contributions to our department, FREIA and CHI are hosting a special workshop titled Gender, Insecurities and Silences during Conflict and Peacebuilding 27th of September, 2017. We have invited a select group of junior and senior scholars across disciplinary boundaries to explore this issue further. We would like to open up this occasion also for other members of the department and university. Please sign up if you are interested in listening to the presentations (session A), take part in the discussions (session B), or both.
27.09.2017 kl. 13.00 - 16.00
Institut for læring og filosofi, Aalborg Universitet og Aalborg Universitetshospital har den glæde at invitere til ph.d.-forsvar ved sygeplejerske MLP Susanne Winther, Forskningsenhed for Klinisk Sygepleje, som forsvarer ph.d.-afhandlingen: FÆLLES FØLGESKAB -ET AKTIONSFORSKNINGSPROJEKT OM PATIENTOVERGANGE FRA INTENSIV TIL STAMAFSNIT
27.09.2017 kl. 16.00 - 18.00
September 27th from 16.00 - 18.00, we invite you to a nation-wide early premiere of Phie Ambo’s new exciting documentary “...when you look away”. The screening will be followed by a debate live-streamed directly from Skylab at DTU, which you can participate in by sending questions via SMS, twitter and facebook.
28.09.2017 kl. 09.00 - 12.00
Open workshop with Dr. Benjamin Schögler, Co-founder and Creative Director at Skoogmusic. Ben is passionate about making music accessible for everyone and was part of the NESTA team that invented SKOOG - an instrument that anyone can play.
28.09.2017 kl. 10.00 - 13.00
Anja Sloth Ziegler, Department of Chemistry and Bioscience will defend her thesis on: "The microbial community in fouling membrane bioreactors: Distribution and diversity of important bacteria"
28.09.2017 kl. 15.00 - 16.30
Præsentation ved henholdsvis professor og lektor ved Institut for Sociologi og Socialt Arbejde på AAU, Annick Prieur og Sune Qvotrup Jensen.
29.09.2017 kl. 09.00 - 17.00
Seminar on animation and visual research dissemination. Learning from state-of-the-art case-studies and ongoing research projects, we will discuss how 2D and 3D-visualisation and animation, narrative structures, and levels of temporal information can be combined in functional animation e.g. for educational or didactic purposes, or in the presentation or development of scientific material.
29.09.2017 kl. 09.00 - 17.30
This workshop brings together scholars from philosophy and history of science to help shed light on epistemological and historical cases of ‘evidence-based’ (or ‘informed’) policy and policymaking.
29.09.2017 kl. 13.00 - 16.00
Klinisk Institut, Aalborg Universitet og Aalborg Universitetshospital har den glæde at invitere til ph.d.-forsvar ved læge Jesper Moesgaard Rantanen, Nyremedicinsk Afdeling, som forsvarer ph.d.-afhandlingen: "Arrhythmias, Heart Rate Variability and Marine n-3 Polyunsaturated Fatty Acids in Patients on Chronic Dialysis"
29.09.2017 kl. 14.00 - 15.30
The seminar is open to all interested researchers!
02.10.2017 kl. 17.00 - 18.00
Mød uddannelsens faglige leder, Dorte Ågård, og hør mere om det faglige indhold. Bliv klogere på uddannelsens perspektiver og relevans i forhold til dit eget arbejdsområde eller interesseområde. Få svar på alle dine faglige og praktiske spørgsmål.
03.10.2017 kl. 13.00 - 16.30
Hør om de væsentligste ændringer, der forventes at komme i bygningsreglement BR18
04.10.2017 kl. 09.00 - 16.00
På dette kurset kan du lære, hvordan gulve, vægge og installationer kan udføres, så kravene i BR15 er overholdt, og så der opnås størst mulig sikkerhed mod skader fra vand og fugt.
04.10.2017 kl. 10.00 - 17.00
Writing has always been a key discipline to master within political sciences and humanities. Today writing articles and getting them published is more important than ever. Be it for the PhD-student using a collection of peer-reviewed and published articles as basis for the PhD, or for the young PhD aiming at a university career.
04.10.2017 kl. 13.00 - 17.00
Klinisk Institut, Aalborg Universitet og Aalborg Universitetshospital har den glæde at invitere til ph.d.-forsvar ved Steen Møller Hansen, Klinisk Epide-miologisk Afdeling, Aalborg Universitetshospital, som forsvarer ph.d.-afhandlingen: Opportunities and Limitations for Provid-ing Early Defibrillation of Out-of-hospital Cardiac Arrest Patients