超细纤维素与丙烯酰胺接枝共聚物在调剖堵水中的应用

Application of Graft Copolymer of Super Fine Fiber and Acrylamide in Profile Control and Water Plugging

通过室内实验得到超细纤维素丙烯酰胺接枝共聚物为调剖剂主剂的最佳配方为:2000 mg/L接枝共聚物C-PAM+1000 mg/L交联剂PF+20 mg/L控制剂氯化铵,考察了该调剖剂体系的抗盐性、耐温性及抗剪切性。实验结果表明,该调剖剂体系具有较好的抗盐性,在自来水中的初始黏度为30 m Pa·s,成胶后的凝胶强度为3.5×104m Pa·s,在矿化度100 g/L的模拟地层水中成胶后的凝胶强度为3×104m Pa·s。该调剖剂体系适用于60数80℃的中性油藏,形成凝胶的稳定期超过80 d。该调剖剂体系具有较强的抗剪切性,在经过高速剪切(剪切速率100 s-1)后,初始黏度保留率在60%以上,成胶后凝胶强度保留率在80%以上。综上,超细纤维素丙烯酰胺接枝共聚物C-PAM可应用于调剖堵水中。

The graft copolymer of superfine fiber and acrylamide used to profile control and water plugging was optimized through the indoor experiment, the best formula of profile control agent was as follows： 2000 mg/L graft copolymer C-PAM ＋ 1000 mg/L cross-linking agent PF＋ 20 mg/L ammonia chloride control agent. Salt resistance, temperature tolerance and shear resistance of the profile control agent were studied systematically. The results showed that, the profile control agent had good salt resistance, its initial viscosity in tap water was of 30 m Pa·s, and after gelation, its viscosity was of 3.5×104m Pa·s,and in simulated formation water with salinity of 100 g/L, the viscosity of the profile control agent after gelation could be as high as 3×104m Pa·s. The profile control agent was suitable for the neutral oil reservoirs with the formation temperature of 60数 80℃, which could be stable for more than80 d. The profile control agent had good shear resistance, the retention rate of initial viscosity was over 60% after high speed shearing at the shearing rate of 100 s-1, and the retention rate of the gel strength was above 80% after forming gel. Thus, the graft copolymer of superfine cellulose and acrylamide could be used in the profile control and water plugging.