Rheology and Polymer Flooding Characteristics of Partially Hydrolyzed Polyacrylamide for Enhanced Heavy Oil Recovery

Rheology and Polymer Flooding Characteristics of Partially Hydrolyzed Polyacrylamide for Enhanced Heavy Oil Recovery
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Polymer flooding characteristics of partially hydrolyzed polyacrylamide (HPAM) solution mixed with NaOH were examined in homogeneous glass-bead packs. The heavy oil recovery in unconsolidated sandstone formations was observed by applying the alkali-polymer flooding. It was found that HPAM solution was sensitive to high temperature, salinity concentration and pH. Alkali-polymer solutions are more effective in improving viscosity than conventional polymer solutions. The solution of 0.5 wt% NaOH mixed with 1500 ppm HPAM (12mole% hydrolysis degree) was the optimal choice with given experiment condition, which gives rise to the highest viscosity on the rheological characterization. Flood tests using the alkali-polymer solution showed an increase in oil recovery by 30% over waterflooding when the water-cut reached 95%, indicating that alkali-polymer could be more effective in improving sweep efficiency than polymer flood. Accordingly, a potential to improve heavy oil recovery in unconsolidated sandstone formations by applying the alkali-polymer flooding is observable.
Abstract ⅰ 요약문 ⅱ Table of Contents ⅲ List of Tables ⅴ List of Figures ⅵ 1.Introduction 1 2.Review of Literature 3 2.1. Heavy oil 3 2.2. Polyers used in enhanced oil recovery operations 6 2.2.1.Main types of polymers 6 2.2.2.Hydrolyzed polyacrylamide 6 2.2.3.Xanthans 8 2.2.4.pH-sensitive polymers 9 2.3. Rheological properties of aqueous polymer solutions 11 2.3.1.Shear viscosity 11 2.3.2.Rheological behavior of polymer solutions in porous media 13 2.4. pH Effect of Hydrolyzed Polyacrylamide 15 2.5. Enhanced oil recovery methods 16 2.5.1.Primary recovery methods 16 2.5.2.Improved recovery methods 16 2.6. Polymer flooding 17 2.6.1.Polymer flooding for EOR applications 17 2.6.2.Polymer flooding mechanism and principles 18 2.6.3.Screening criteria for polymer flooding 19 3.Description of Apparatus 23 3.1. Rheological experiments 23 3.2. Flooding Experiments 23 4.Experimental Procedure 25 4.1. Preparation of polymer solutions 25 4.2. Rheological characterization of polymer solutions 25 4
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College of Engineering(공과대학) > Energy Resource Engineering (에너지자원공학) > Theses(에너지자원공학 석박사 학위논문)
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