陇东致密油藏低界面张力及高接触角助排剂的研发及应用

针对长庆油田陇东致密油藏储层特点和压裂施工工艺要求,选用16碳链长度的阳离子型表面活性剂与非离子型氟碳表面活性剂复配,研发了低表界面张力的助排剂CQZP-1。优化后的助排剂,采用K100表界面张力仪测试表面张力结果为22.130 m N/m;SVT20N旋转界面张力仪测试该助排剂的界面张力值低至0.024 m N/m;DSA100视频光学接触角测量仪测得其与天然岩心间的接触角高达83.6°;并且具有一定的耐盐能力和热稳定性。2015年,在陇东致密油藏开展了206口井239层现场试验与应用。与同区块使用常规助排剂CF-5D的油井相比,现场返排液接触角较大,表界面张力减小,一次放喷率提高10%。

The Development and application of a cleanup additive with low interfacial tension and high contact Angle in the LongdongTight reservoir

According to tight reservoir characteristics of Chang Qing Long dong, A new type of clean up additive CQZP-1 was composite stabilizered, Chooseing effective Length of 16 Carbon Chain cationic surfactants/nonionic anionic fluorocarbon surfactants . Determined by interfacial tensimeter K100,the result show that surface tension was 22.130mN/m.interface tension was tested by SVT20N 0.024mN/m,The result was 0.024mN/m. The result of contact angle was 3.6° which was tested by optical contact angle measuring systemDSA100, and the clean up additive had certain ability of salt resistance. 206 wells 239 layer were tested on Chang Qing Long dong in 2015, return discharge rate was 10% higher than that of conventional auxiliary agent CF-5D , higher contact angle and lower surface/ interfacial tension on flowback fluid compared with the same period