稠油油溶性降黏剂POSA的合成及评价

Synthesis and Evaluation of an Oil- Soluble Viscosity Reducer POSA for Heavy Oil

摘要:

以PPG-400和丙烯酸为原料，采用直接酯化法制备了丙烯酸酯。然后以自制的丙烯酸酯与丙烯酸十八酯、苯乙烯、丙烯酰胺共聚，采用溶液聚合法合成了油溶性四元聚合物降黏剂POSA，并用红外光谱法和核磁表征聚合物的结构和组成特性。通过对其降黏效果的评价，确定了最佳合成条件为：n（丙烯酸十八酯）：n（丙烯酰胺）：n（苯乙烯）：n（丙烯酸酯）=6:1:2:1，引发剂用量为1%，反应温度为80℃，反应时间为6h；在50℃条件下，降黏剂加量为1000mg/L时，稠油的黏度由3008mPa.s降到895mPa.s，表现出了良好的降黏效果。

Abstract:

The acrylate was synthesized though direct esterification firstly with PPG-400 and acrylic acid. And then an oil-soluble quadripolymer was synthesized by solution polymerization with octadecyl acrylate, styrene, acrylamide and the prepared acrylate. The chemical structure and composition of the copolymer was identified by IR spectrum and NMR. The optimum reaction conditions were obtained as follows : n(octadecyl acrylate): n(acrylamide): n(styrene): n(acrylate)= 6:1:2:1, with the initiator dosage being 1%, polymerization temperature being 80℃, and the reaction time being 6 hours. Further，the viscosity was decreased from 3008mPa.s to 895mPa.s when the dosage of viscosity reducer was 1000mg/L at 50℃.