摘要
以硝酸铈铵为引发剂、2-丙烯酰胺基-2-甲基丙磺酸钠(AMPSNa)为接枝改性单体,对魔芋葡甘露聚糖(KGM)进行接枝改性。考察反应温度、引发剂用量、AMPSNa浓度等因素对KGM-g-AMPSNa接枝共聚物溶胶黏度的影响以及交联剂对接枝共聚物交联及压裂液性能的影响。采用FTIR技术对KGM-g-AMPSNa结构进行表征。实验结果表明,合成接枝共聚物最佳的反应条件为:6.2 g KGM溶于20 m L 75%(φ)乙醇,40℃下溶胀0.5 h,AMPSNa浓度0.43 mol/L,引发剂浓度1.71 mmol/L,反应温度50℃,反应时间2.5 h,在此条件下0.6%(w)接枝共聚物溶胶的黏度为196.93 m Pa·s;采用硼砂-有机钛复配交联剂,可使接枝共聚物溶胶的交联性能、耐温性能更好;以0.6%(w)接枝共聚物溶胶和复合交联剂(5.0%(w)硼砂+0.3%(w)有机钛)构成的压裂液的耐温耐剪切性能达到100℃。
The graft copolymerization of konjac glucomannan（KGM） was carried out with sodium 2-acrylamido-2-methyl propane sulfonate（AMPSNa） as grafting monomer and ceric ammonium nitrate （CAN） as initiator. The effects of reaction temperature, initiator dosage and AMPSNa concentration on the viscosity of the graft copolymer were investigated. The influences of cross-linkers on the crosslinking properties of KGM-g-AMPSNa and the temperature tolerance and shear resistance of the fracturing fluids were studied. The KGM-g-AMPSNa was characterized by means of FTIR. The results indicated that the viscosity of the 0. 6% （w） graft copolymer collosol was 196. 93 mPa · s under the optimal reaction conditions of 6.2 g KGM, 20 mL 75 % （φ） alcohol as solvent, swelling at 40 ℃ for 0. 5 h, reaction temperature 50 ℃, c （AMPSNa） 0.43 mol/L, c （CAN） 1.71 mmol/L and reaction time 2.5 h. The crosslinking properties and temperature tolerance of the graft copolymer could be improved by using composite borax-organic titanium cross-linker, its temperature tolerance and shear resistance of the fracturing fluid prepared by 0. 6% （w） graft copolymer combined with the composite cross-linker（5.0% （w）borax ＋0. 3% （w）organic titanium） was as high as 100 ℃.
出处
《石油化工》
CAS
CSCD
北大核心
2015年第4期489-493,共5页
Petrochemical Technology
