新型纳米防水锁表面活性剂的研发与应用

Development and Application of the New Nano Water-proof Lock Surfactant

德惠断陷致密气储集层物性差、微纳米级孔喉发育,压裂改造过程中水锁现象普遍存在,前期应用的纳米微乳助排压裂液体系效果虽好,但成本高。针对致密气储集层水锁伤害难题,进行对-全氟壬烯氧基苯磺酸钠、全氟辛基磺酰基聚氧乙烯醚醇和支链化烷基芳基磺酸盐复配体系性能评价与优选,自动研究新型纳米防水锁表面活性剂,其表面张力小于21 mN/m,溶液粒径小于100 nm,岩心水锁伤害率15.6%~18.7%,比前期同类产品水锁伤害率低5%,成本预计降低70%;现场在DS80-2井开展试验,压后见气返排率3.8%,井口压力18.3 MPa,日产气8.5×10^(4) m^(3),为同区块同厚度气藏最高产量井,效果明显。新型纳米防水锁表面活性剂现场试验取得成功,为吉林油田致密气藏实现高效勘探、效益开发提供了技术支撑。

The tight gas reservoir in Dehui fault depression has poor physical properties and well-developed micro and nano pores and throats.Water lock phenomenon is common during fracturing process.The nano micro emulsion assisted fracturing fluid system used in the early stage has good effect but is with high cost.In order to solve the problem of water blocking damage in tight gas reservoir,the performance evaluation and optimization of the compound system of p-perfluorononenyloxy benzene sulfonate sodium,perfluorooctane sulfonyl polyoxyethylene ether alcohol and branched alkyl aryl sulfonate were carried out.A new nano water-proof lock surfactant was independently developed.The surface tension is less than 21 mN/m,the solution particle size is less than 100 nm,the core water lock damage rate is 15.6%-18.7%,which is 5%lower than the previous similar products,and the cost is expected to reduce by 70%.Meanwhile,the fracturing of Well DS80-2 in Jilin oilfield shows that the flow back rate is 3.8%after gas breakthrough,the wellhead pressure is 18.3 MPa,and the daily gas production is 8.5×10^(4) m^(3).It is the highest production well of the same thickness gas reservoir in the same block,and the effect is obvious.The successful field test of new nano water-proof surfactant provides technical support for efficient exploration and development of tight gas reservoir in Jilin Oilfield.