一种具有强油/水/固分离能力的多功能阳离子聚合物复配体系PF-C

Multifunctional Active Polymer Composition PF-C with High Oil/Water/Solids Separating Power

由专门合成的聚多二甲胺基N-乙基丙烯酰胺（PF，5．6％）、烯基双环咪唑啉封端聚醚（2．0％）、抗盐表面活性剂TM-1（3．0％）及水（89．4％）配成题示多功能阳离子聚合物体系PF-C，与玉门石油磺酸盐、破乳剂M-510等对比，考察了PF-C的应用性能。由石英砂、蒙脱土、高岭土及原油制成油土砂样，与水或20％PF-C水溶液以10：4质量比混合，测得PF-C使水的表面张力降低、使水在石英砂上的接触角大幅升高，使原油在砂土表面的黏附功大幅减小，洗油率视原油不同在95％～100％。4mL20％PF-C水溶液与10g油土砂样混合放置2小时，温度为50～90℃时油、砂土、水完全分离，油水界面清晰。在一专门设计的仪器上，测得2小时内黏土不从20％PF-C水溶液中吸水。已被水充分溶胀的人造岩心注入PF-C后渗透率可基本恢复。在胜利滨南油田单6、单10区块出砂严重的6口蒸汽吞吐稠油井，在注汽末期伴随蒸汽（200～300m3）注入0．5％～1．0％PF—C，使生产周期平均延长55天，周期产油量平均增加333t。讨论了PF-C的作用机理。图1表6参4。

The titled multifunctional active polymer aqueous composition, PF-C, is compce, ed of a specially synthesized active polymer, polyethylenepolyamine and partially （10%） N-ethylated polyacrylamide reaction product （5.6%）, alkenyl-biscycloimidazofine derivative terminated and toluenediisocyanate chain-extended block-polyether （2.0%）, salt tolerant surfactant TM-1 （3.0%）, and water （89.4%）. Its performance properties are investigated comparatively with Yumen＇s petroleum sulfonates, demulsifier M-510, and others. An oil/clay/sand blend （OCSB） is prepared from quartz, montmorillonite, kaolinite, and crude oil and, mixed with 20% PF-C aqueous solution （and water as control） at mass ratio 10：4 for experimental determinations and the results are： PF-C lowers the surface tension of water, dramatically raises the contact angle of water on quartz surfaces and significantly lowers the adhesion work of crude oil on san＇faces of quartz with clay minerals while a percentage oil washed out is in range 95-100% depending on the grade of crude oil. Oil, water, and solid phases are separated with sharp oil/water interfaces from mixtures of 4 mL 20% PF-C solution and 10 g OCSB in 2 hr standing at 50-90℃. Clay does not absorb any water from 20% PF-C aqueous solution in 2 hrs as measured on a specially designed apparatus. The highly swelled in water artificial cores can practically recover their original permeability by injecting PF-C. At blocks Shanjiasi-8 and -10 of Binnan, Shengli, PF-C have been put into field uses as steam additive in huff-puff wells with serious sanding troubles, being injected into 6 wells at 0.5-1.0% dosage together with steam （200-300 m^3） in the late stage of a steam injection cycle, and the results were fair good： the production cycle elongated by 55 day in average; the oil output in the cycle raised by 333 tones per well. The functioning mechanisms of PF-C are discussed.