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以丙烯酰胺、3-烯丙氧基-2-羟基-1-丙烷磺酸钠和丙烯酸十八酯为原料,用反相乳液聚合法制备出聚丙烯酰胺压裂液减阻剂,通过FTIR和TEM对产物结构和形貌进行了表征,考察了压裂液减阻剂的减阻性、溶解性、耐剪切性、黏弹性和配伍性等性能,结果表明:聚丙烯酰胺压裂液减阻剂的固含量为29.6%,黏均分子量为8.5×105g/mol,乳液黏度为1 800 m Pa·s;在流速为6.8 m/s时,乳液溶解时间为48 s;在流速为10 m/s、质量浓度为1 g/L、剪切时间为300 s时,减阻率保持在70%以上,耐剪切性能较好;在室温下、流速为11 m/s、质量浓度为1 g/L时,减阻率为78%,减阻率随着减阻剂质量浓度的增大先逐渐增大后保持平衡;黏弹性测试表明:聚合物属于黏弹性结构流体,在剪切频率为1 Hz,应力变化为5%时,体系的储能模量(G’)大于耗能模量(G″),差值为0.4 Pa;配伍性测试表明:在流速10 m/s、质量浓度1g/L、温度为80℃和矿化度为20 g/L时,减阻剂减阻率为53%,助排剂和黏土稳定剂对减阻剂减阻效果无影响。
Using acrylamide, sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and octadecyl acrylate as raw materials, polyacrylamide fracturing fluid drag reducer was prepared by reverse phase emulsion polymerization. FTIR and TEM was used to characterize the structure and morphology of the product. The drag reduction, solubility, shear resistance, viscoelasticity and compatibility of the fracturing fluid drag reducing agent were investigated. The results show that the reduction of polyacrylamide fracturing fluid The viscosity of the resist was 29.6%, the viscosity average molecular weight was 8.5 × 105 g / mol and the viscosity of the emulsion was 1 800 mPa · s. The dissolution time of the emulsion was 48 s at a flow rate of 6.8 m / s. At a flow rate of 10 m / s, the mass concentration of 1 g / L, the shear time of 300 s, the drag reduction rate maintained at 70% or more, good shear resistance; at room temperature, the flow rate of 11 m / s, the mass concentration of 1 g / L, the drag reduction rate is 78%. The drag reduction rate increases with the increase of drag reducer mass concentration and then keeps equilibrium. Viscoelasticity test shows that the polymer belongs to the viscoelastic structure fluid, Is 1 Hz and the stress change is 5%, the storage modulus (G ’) of the system is greater than the energy consumption modulus (G "), the difference is 0.4 Pa. Compatibility tests show that at a flow rate of 10 m / s, Concentration 1g / L, the temperature is 80 ℃ When the salinity of 20 g / L, DRA drag reduction was 53%, drainage aids and clay stabilizer has no effect on drag reduction drag reducing agents.