Synthesis and Characterization of a Novel Multibranched Block Polyether Demulsifier by Polymerization

Area of Science:

• Petroleum Engineering
• Polymer Chemistry
• Colloid and Surface Science

Background:

• Heavy oil emulsions pose significant separation challenges in oilfield operations due to their high stability.
• Existing flooding technologies exacerbate emulsion issues, necessitating advanced demulsification solutions.

Purpose of the Study:

• To synthesize novel multibranched block copolymers as efficient demulsifiers for heavy oil emulsions.
• To investigate the demulsification performance of modified polyether demulsifiers with varying solubility characteristics.

Main Methods:

• Synthesis of multibranched block copolymers using alcohol initiators and open-loop polymerization.
• Modification of copolymers for water-soluble and oil-soluble properties.
• Characterization using Hydrophile-Lipophile Balance (HLB) values and surface tension measurements.
• Evaluation of demulsification efficiency via dehydration rate experiments.

Main Results:

• Novel water-soluble and oil-soluble block polyether demulsifiers were successfully synthesized.
• Water-soluble demulsifiers demonstrated superior performance within 5 hours compared to oil-soluble counterparts.
• Optimal demulsification was achieved at a specific HLB value, reaching peak dehydration rates.
• Demulsifier X-6 achieved a 91% dehydration rate at 50 μg/g and 85 °C, yielding clear water.

Conclusions:

• The synthesized multibranched block copolymers offer a novel and efficient approach for demulsifying stable heavy oil emulsions.
• Tailoring the hydrophile-lipophile balance (HLB) is crucial for maximizing demulsification and dehydration efficiency.
• This research provides a promising solution for improving oil-water separation in heavy oil recovery processes.