特高盐油藏SMG和SH03二元复合驱产出液用破乳剂的合成与评价

Synthesis and Evaluation of Demulsifier for Production Liquid of SMG and SH03 Binary Compound Flooding in the Extra High Salinity Reservoir

针对钟市油田矿化度高达300000 mg/L的特高盐油藏进行二元复合驱后产出水乳化严重而常用破乳剂的破乳效果欠佳的情况,通过主体单体AM与耐盐单体AMPS和苯乙烯磺酸钠SSS由过硫酸钾-亚硫酸氢钠引发共聚,合成了不同于常规聚醚或聚醚改性的耐盐聚合物破乳剂,并通过正交实验确定最佳产品HYDR2的合成条件。AM、AMPS摩尔比2∶1、SSS占单体总质量的4%、引发剂占单体总质量的1.5%、反应温度80℃、反应时间6h、p H值9时所合成的HYDR2性能最佳。HYDR2的加量以5 g/L为宜,对钟市油田复合驱模拟采出液脱水率(10 h)高达99.5%以上,具有良好的破乳效果。HYDR2破乳剂的破乳效果优于油田目前在用的破乳效果好的破乳剂AE1910,5 g/L的破乳剂AE1910处理模拟采出液10 h后的脱水率为89.6%。

The emulsification of the produced water after the binary compound flooding in the extra high salinity reservoir with the salinity of 30× 10^4 mg/L is serious and the demulsification treatment is difficult. A type of salt-tolerant polymer demulsifier, which was different from the conventional polyether or the modified polyether, was synthesized in this paper through copolymerization among the main monomer AM, salt-tolerant association monomer AMPS and sodium styrene sulfonate using the potassium persulfate-sodium bisulfite initiator, and the optimal synthesis conditions was determined by orthogonal experiment. The results showed that when the molar ratio of AM to AMPS was 2：1 ; the mass ratios of the SSS and the initiator to the total monomers was 4% and 1.5%, respectively; the reaction temperature was 80qC ; the reaction time was 6 hours and the pH was 9, the obtained demulsifier, named as HYDR2, had good demulsification effect. The demulsifieation effect of HYDR2 was better than that of the demulsifier AE1910 used in the field. When the concentration was 5 mg/L, the dewatering rate of HRDR2 and AE1910 to the produced fluid after 10 hours was 99.5% and 89.6%,respectively.