长链端基疏水缔合减阻剂的制备与性能评价

Preparation and Performance Evaluation of Hydrophobically Associating Drag Reduction with a Long-chain End-group

为发展新型滑溜水减阻剂,以丙烯酰胺(AM)、疏水单体十二烷基二甲基烯丙基氯化铵(C12DMAAC)、丙烯酸钠(NaAA)为原料,通过自制长链疏水引发剂2,2'-偶氮二异丁基十二脒盐酸盐(AIBL)制备了长链端基疏水缔合聚合物(HPAM-L),通过红外光谱仪、核磁共振波谱仪、乌氏黏度计、荧光分光光度计和旋转流变仪等对HPAM-L的结构与性能进行表征,利用压裂液摩阻测试仪测定了不同浓度HPAM-L溶液的减阻性能。结果表明,HPAM-L的相对分子质量为7.43×10^(6),临界缔合浓度为1~1.5 g/L,具有良好的耐温性和剪切稳定性。HPAM-L的水溶液具有较宽的线性黏弹区,且浓度越高弹性特征越明显。在溶液质量分数为0.075%、0.086%、0.1%、0.15%下的最大减阻率分别可达到71.6%、73.1%、73.3%和74.1%,减阻性能良好。

In order to develop a new type of slick water reducer,the long-chain end-group hydrophobic associating polymer HPAM-L was prepared from acrylamide(AM),hydrophobic monomer dodecyldimethylallylammonium chloride(C12DMAAC),sodium acrylate(NaAA)and homemade long-chain hydrophobic initiator 2,2’-azobis(isobutyl)dodecamidine hydrochloride(AIBL).The structure and properties of HPAM-L were characterized by infrared spectroscopy,nuclear magnetic resonance spectroscopy,Ubbelohde viscometer,fluorescence spectrophotometer and rotational rheometer.The resistance reduction performance of HPAM-L solutions with different concentrations was measured by using fracturing fluid friction tester.The results showed that the relative molecular weight of HPAM-L was 7.43×10^(6),and the critical association concentration was 1—1.5 g/L.HPAM-L had good temperature resistance and shear stability.The aqueous solution of HPAM-L had a wide linear viscoelastic region.The higher the concentration,the more obvious the elastic characteristic was.The maximum drag reduction rates at the solution mass fractions of 0.075%,0.086%,0.1%and 0.15%could reach 71.6%,73.1%,73.3%and 74.1%,respectively,showing good drag reduction performance.