Using organic amine as primer,propylene oxide(PO) and epoxy ethane(EO) as monomer,potassium hydroxide as catalyst, TA4812 and AP442 multi-block polyether demulsifiers are synthesized at less than 0. 5 Mpa,ring-opening polymerization temperature for PO of (130±5) ℃,ring-opening polymerization temperature for EO of (120±5) ℃. Combined to BC with different proportion,dehydration experiments of the combinational demulsifiers for Hezhuangping and Zichang crude oil in North Shanxi Oilfield show that,for Hezhuang-ping crude oil,the dehydration rate of combinational demulsifiers is the highest to 92.8% and 94. 8%,respectively, when demulsifier total amount is 100 mg ? L-1 , the proportion of TA4812 or AP442 to BC is 4: 1 at 55 ℃ for 6 h,for Zichang crude oil,the dehydration rate is the highest to 98. 3% and 96. 3% respectively,when demulsifier total amount is 200 mg ? L-1 ,the proportion of TA4812 or AP442 to BC is 4 ! 1 at 65 °C for 6 h. There is no oil or suspended matter in the clear separated water and the interface between oil and water is homogeneous by using combinational demulsifiers.%以有机胺为起始剂、环氧乙烷和环氧丙烷为单体、氢氧化钾为催化剂,在环氧丙烷开环聚合温度为(130士5)℃、环氧乙烷开环聚合温度为(120士5)℃、压强低于0.5 MPa的条件下合成了嵌段聚醚型破乳剂单剂TA4812和AP442,将其分别与助剂BC以不同比例复配,对陕北油田有代表性的河庄坪和子长原油进行脱水实验.结果表明,对河庄坪原油,在55℃、破乳剂总用量为100mg·L-1、脱水时间为6h的条件下,TA4812、AP442与BC复配比例为4∶1时,脱水速率快,脱水率最高,分别达到92.8％、94.8％；对子长原油,在65℃、破乳剂总用量为200mg·L-1、脱水时间为6h的条件下,TA4812、AP442与BC复配比例为4∶1时,脱水速率快,脱水率最高,分别达到98.3％、96.3％；且脱出的水清不含油,无悬浮物,油水界面整齐.
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