海上油田采出液破乳剂聚丙烯酸酯乳液的合成

SYNTHESIS OF POLYACRYLATE EMULSION AS DEMULSIFIER FOR PRODUCED FLUID IN OFFSHORE OILFIELD

以甲基丙烯酸乙酯(EMA)为主单体,甲基丙烯酸(MAA)、丙烯酰胺(AM)为功能单体,采用乳液聚合方式合成了聚丙烯酸酯乳液型油田采出液破乳剂,并优化了其合成条件,分析了其破乳作用机理。结果表明:当EMA用量为5.91 g、MAA用量为3.34 g、AM用量为1.25 g、引发剂(过硫酸铵)用量为40 mg、乳化剂(十二烷基硫酸钠)用量为0.9 g、反应温度为73℃、搅拌速率为200 r/min、反应时间为4 h时,合成破乳剂的破乳性能和稳定性最优;在破乳温度为60℃、沉降时间为10 min、破乳剂加量为30 mg/L时,该破乳剂对采出液的脱油率达到90.9%;合成破乳剂的性能优于市售破乳剂和海上平台现用乳液型破乳剂,这归因于其分子中含有丰富的双亲基团,使其具有优异的界面活性。

Using ethyl methacrylate(EMA)as the main monomer,methacrylic acid(MAA)and acrylamide(AM)as the functional monomer,polyacrylate emulsion demulsifier was successfully synthesized by emulsion polymerization,the synthesis conditions were optimized and the demulsification mechanism was analyzed.The results showed that the optimum synthesis conditions were as follows:EMA 5.91 g,MAA 3.34 g,AM 1.25 g,initiator(ammonium persulfate)40 mg,emulsifier(sodium lauryl sulfate)0.9 g,reaction temperature 73℃,agitation rate 200 r/min,and reaction time 4 h.When the demulsification temperature was 60℃,the settling time was 10 minutes,and the dosage of demulsifier was 30 mg/L,the oil removal rate of the produced fluid reached 90.9%.The properties of synthetic demulsifiers were better than those of commercial demulsifiers and emulsion demulsifiers used on offshore platforms.This is attributed to the abundant amphiphilic groups in its molecules,making it have excellent interfacial activity.