精细石油化工

为提高页岩储层压裂施工过程中压裂液的返排效率，以长链烷基叔胺、环氧氯丙烷以及盐酸作为合成单体，采用溶液聚合法制备一种新型双子表面活性剂SFR，并将其与白油、正丁醇、3%KCl溶液以及蒸馏水相结合，制备了一种新型纳米乳液助排剂SFR-W。评价了SFR-W的粒径分布、表面活性、助排性能以及储层保护性能，并进行了现场应用。实验结果表明：新型纳米乳液助排剂SFR-W的粒径较小（1～12 nm），能够顺利进入页岩储层的微小孔隙中。在SFR-W质量分数为0.5%时，溶液表面张力低至22.36 mN/m，助排率为75.6%，对储层段岩心的渗透率伤害率低于5%。现场应用结果表明，滑溜水压裂液中加入新型纳米乳液助排剂SFR-W后，页岩气井压裂投产后的日产气量显著提升，压裂增产效果较好，适合在同类型页岩储层压裂施工中进一步推广应用。

In order to improve the flowback efficiency of fracturing fluid during shale reservoir fracturing, a new gemini surfactant SFR was prepared by solution polymerization with long-chain alkyl tertiary amine, epichlorohydrin and hydrochloric acid as synthetic monomers, and a new nano lotion cleanup agent SFR-W was prepared by combining it with white oil, n-butanol, 3%KCl solution, and distilled water. The particle size distribution, surface activity, drainage performance, and reservoir protection performance of SFR-W were evaluated and applied on site. The experimental results show that the new nano lotion clean up additive SFR-W has a small particle size(1-12 nm), can smoothly enter the micro pores of shale reservoirs. The recommended optimal mass fraction for SFR-W is 0.5%. At this point, the surface tension of the solution is as low as 22.36 mN/m, the drainage rate is 75.6%, and the permeability damage rate to the reservoir core is less than 5%. The field application results show that after the new nano lotion cleanup agent SFR-W is added to the slick hydraulic fracturing fluid, the daily gas production of shale gas wells after fracturing and production is significantly increased, and the fracturing stimulation effect is good, which is suitable for further promotion and application in the fracturing construction of shale reservoirs of similar shale reservoirs.