An 3-step demulsifier evaluation method and application
The dosage of demulsifier was up to 480 mg/L in one of 95％water content oil-field in South China Sea,which is much higher than the same type of oilfield in the South Chian Sea.For cost control,based on the oilfield treatment process and application effect,a 3-step evaluation method of demulsifier was established,and optimization demulsifier HP-15 was recommended.Field test results show that the demulsifier HP-15 has a good demul-sification effect and a synergistic effect with the clear water agent when the dosage at the in let of the production separator is 40 mg/L,and the water clarifier reduced from 20 mg/L to 13 mg/L compared to products in use,the average OIW in water overboard decreased from 20 mg/L to 11 mg/L.When the dosage of the demulsifier HP-15 at subsea pipeline inlet was reduced from 400 mg/L to 100 mg/L compared to products in use,re-emulsification was well inhibited and the pressure was stable.Benefit from the new evaluation method,71％ reduc-tion of demulsifier usage and 35％reduction of water clarifier usage and better oil-water treatment effect was achieved,and cost reduction of 5 million per year was obtained.
万方数据
