复配交联剂对阳离子聚合物压裂液性能的影响

Effect of a Compound Cross Linker on the Performance of Cationic Polymer Fracturing Fluid

邹 琴 罗 辉 张 熙 李美平 周 瀚 何启平 蔡远红 鲍 晋 徐婷婷

ZOU Qin LUO Hui ZHANG Xi LI Meiping ZHOU Han HE Qiping CAI Yuanhong BAO Jin XU Tingting

为进一步提高阳离子聚合物压裂液的耐温抗剪切性能，以阳离子聚合物 PAAD为稠化剂，采用间苯二酚（FA）、乌洛托品（FB）与有机钛（TCMH）复配物为交联剂配制压裂液，研究了复配交联剂在改善聚合物压裂液耐温抗剪切性能方面的作用效果。结果表明，FA和 FB的混合物在高温条件下能与 PAAD稠化剂发生交联反应，提高交联体系的稳定性；PADD压裂液的性能与 FA、FB的配比和加量有关，FA与 FB的质量比为 1∶2、加量为 0.15%～ 0.3%的压裂液具有较好的耐温抗剪切性能；与单独使用 TCMH 有机钛交联剂的 PAAD 压裂液相比，采用TCMH-FA-FB复配交联剂配制的 PADD压裂液具有更好的耐温抗剪切性能；组成为 0.6% PAAD+1.0% TCMH+0.3% FA-FB（FA∶FB=1∶2）、pH=3～ 4的压裂液经 160℃、170 s-1连续剪切 90 min后的黏度仍保持在 60 mPa·s左右，满足 160℃高温油气井压裂施工需要。图5参 14

In order to further improve the temperature and shear resistance of cationic polymer fracturing fluid，a kind of fracturing fluid which used cationic polymer PAAD as thickening agent and the compound of resorcinol（FA），hexamethylenetetramine（FB）and organic titanium TCMH as cross-linker was prepared. The effect of compound cross linker on the performance of temperature and shear resistance was investigated. The results showed that the cross linking reaction occurred between thickening agent PAAD and the compound of FA and FB at high temperature，which improved the stability of cross-linking structure. The performance of cationic polymer fracturing fluid was related to the mass ratio and concentration of FA and FB. The fracturing fluid had a quite good performance on temperature and shear resistance when the mass ratio of FA and FB was 1∶2 and the dosage of FA and FB was 0.15%—0.3%. The PADD fracturing fluid which cross-linked by TCMH-FA-FB had better performance on temperature and shear resistance compared with that of PAAD fracturing fluid which cross-linked by TCMH without FA-FB. The viscosity of PADD fracturing fluid（pH=3—4）that contained 0.6% PAAD，1.0% TCMH and 0.3% FA-FB（FA∶FB=1∶2）remained 60 mPa·s after continuous shearing for 90 minutes at 160℃ and 170 s-1，which could meet the requirement of fracturing construction in oil and gas wells at 160℃.