一种“三段式”破乳剂评价方法及其应用

An 3-step demulsifier evaluation method and application

南海某油田含水率为95%,破乳剂加注浓度高达480 mg/L,远高于南海同类型油田。为降本增效,结合该油田处理工艺和应用效果,建立了“三段式”破乳剂评价方法,评价出破乳剂HP-15。现场试验结果表明,破乳剂HP-15在生产分离器入口加量为40 mg/L时,破乳效果良好且与清水剂发生协同效应,清水剂加量从20 mg/L降低至13 mg/L,外排水OIW均值从20 mg/L降至11 mg/L;破乳剂HP-15海管入口加量为100 mg/L时,比在用破乳剂加量降低300 mg/L的条件下,能够较好地抑制再乳化,海管压力稳定。受益于新方法,破乳剂加量降幅高达71%,清水剂加量降幅达35%,在改善油水处理效果的同时,实现年降本500万元。

The dosage of demulsifier was up to 480 mg/L in one of 95%water content oilfield 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 demulsification effect and a synergistic effect with the clear water agent when the dosage at the inlet 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%reduction 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.