Carbon dioxide(CO2)flooding,as an important measure for enhanced oil recovery,has been widely applied in oilfields.However,a common issue associated with CO2 flooding is the darkening and high oil content of produced fluids,posing significant challenges to the oil-water treatment in the gathering and transportation system.In this study,based on the principles of oil-water separation,the formulation of demulsifiers was optimized.Ingredients with water-clearing properties were introduced into the demulsifier.Laboratory experiments demonstrated a significant reduction in oil content in the separated wastewater.After implementation in the field,the demulsifier dosage was reduced from the original 300 mg/L to 160 mg/L,and water oil content decreased from 200 mg/L to 140 mg/L.The field operation remained stable.Further efforts will focus on reducing the dosage of the demulsifying agent.This work can annually save 47%of the demulsifier costs for NP 2-3 and provides valuable insights for the treatment of CO2-contaminated wastewater in oilfields.
关键词
二氧化碳吞吐/采出液/破乳剂/水含油
Key words
CO2 throughput/extracted liquid/demulsifier/water and oil content
维普
万方数据