Properties of a novel imbibition polymer with ultra-high wetting ability as fracturing fluid system
Novel fracturing fluid system with wettability was prepared. XRD and TGA of the polymer were measured. Rheology and SEM experiments showed that the fracturing fluid had a dense network structure. The microstructures of gel breaking fluid were obtained through SEM and TEM tests which demonstrated more obvious crosslinking. Contact angle and wetting function of gel breaking fluid were evaluated on sandstone. NFW fracturing fluid showed excellently rheological properties at 90 ℃. The surface tension of gel breaking fluid was relatively low which was 20 mN/m. The WA, BET and Zeta potential of NFW gel breaking fluid suggested that the material was absorbed on the sandstone surface and a bilayer was formed. Meanwhile, CT and AFM studies indicated that the imbibition effect of the gel breaking fluid was obviously observed on the sandstone. The contact angle had been increased to 146° when the sandstone was immersed in solution which suggested the wettability of rock was changed. The imbibition efficiency of NFW is higher than water. Thus, this fracturing fluid with wettability could be an alternative for the development in tight oil reservoirs.