用于稠油脱水的油水两亲破乳剂BC-068的研制与应用

Preparation and Use of High-Molecular Amphipathic Demulsifier BC-068 for Dehydration of Heavy Crude Oils

研制了新疆克拉玛依九区稠油专用的破乳剂BC 068。所用起始剂为含多活泼基团的星形聚合物,合成的嵌段聚醚中起始剂与亲油头之比在1∶100～268范围,EO含量为25%～55%,经一种油水两亲的两性化合物改性(扩链),得到高分子量、油水两亲的改性聚醚破乳剂。在75℃、加剂量为100mg/L时,BC 068对九区92号站含水48.6%的稠油脱水率高达99%,脱出水清,油水界面齐,其脱水性能优于所有对比药剂,包括92号站现用药剂PR 02。加剂量降至80、60mg/L或温度降至70℃、65℃时,BC 068的脱水性能均优于PR 02,特别是在较低温度下。在92号站进行为期38天的现场试验,BC 068替换PR 02,加剂量由105mg/L逐步降至81mg/L,净化油含水由11.2%降至0.77%,污水含油由3657mg/L降至2645mg/L。此后BC 068在92号站投入使用,使原来的原油热 电 化学脱水工艺简化为热化学脱水工艺。图1表4。

A demulsifier, BC-068, is prepared specially for use in dehydrating the heavy crude oils from district No 9 in Karamay oil fields. The initiator for the block polyether synthesis is a star-like polymer containing lots of active groups; in the blcok polyether synthesized, the ratio of initiator to oleophilic end is in rang 1∶100—268 and the EO content?—?25—55%; the polyether is then modified by an amphipathic, amphoteric compound for chain extending to give a high-molecular amphipathic polyether modification as demulsifier. At 75℃ and dosage of 100 mg/L, a dehydration rate as high as 99% is observed for a crude oil of 48.6% water cut taken from oil gathering/water treating plant No 92 in district No 9 by using BC-068 with clear water separated and even oil/water interfaces appeared and the dehydrating ability of BC-068 is higher than all the chemicals used as control and the demulsifier used at the plant, PR-02. At lower dosage of 80 and 60 mg/L and, in particular, at lower temperatures of 70℃ and 65℃, BC-068 is more effective than PR-02. In field trial test at plant No 92 in 38 days PR-02 is replaced by BC-068, the demulsifier dosage is reduced steprise from 105 to 81 mg/L, the water cut of the purified oil is decreased from 11.2% to 0.77% and the oil content in the separated water?—?from (3 657) to 2 645 mg/L. With BC-068 put into field use, the technology of thermo-electro-chemical hydration at plant No 92 is simplified, becoming thermo-chemical one.