复合醚化淀粉降滤失剂的合成与性能测试

Synthesis and Performance Testing of Compond Etherification Starch Filtrate Reducer

以玉米淀粉(CS)为原料,以氯乙酸为第一步醚化变性剂,3-氯-2-羟丙基磺酸钠为第二步醚化变性剂,采用二步法工艺,在水相碱性条件下合成可应用于油田钻井液的复合醚化淀粉(CES)降滤失剂。对产品的降滤失性能进行了测试,利用FT-IR对其分子结构进行了表征。研究表明,制备复合醚化淀粉的最佳工艺条件为:反应温度55℃,3-氯-2-羟丙基磺酸钠与羧甲基淀粉(CMS)的质量比为1∶2,反应时间120 min。在最佳制备工艺条件下合成的产品作为降滤失剂使用时,其抗老化温度可达130~140℃。FT-IR分析显示,复合醚化淀粉在1609 cm^(-1)出现羧基吸收峰,在1205 cm^(-1)等处出现磺酸基吸收峰,证明已成功合成复合醚化淀粉。

With corn starch(CS)as raw material,chloroacetic acid as etherification first step denaturing agent,3-chloro-2-hydroxypropyl sulfonate as second step etherification denaturant,the complex etherified starch(CES)which could be used in the oil drilling fluid filtration reducing agent in aqueous solution was synthesized under alkaline conditions by two step process,and the fluid loss properties of products was tested,the molecular structure was characterized by FT-IR.The results showed that the optimum conditions of preparation of compound starch etherification were:the reaction temperature was 55℃,the ratio of 3-chloro-2-hydroxypropyl sulfonate sodium to carboxymethyl starch(CMS)was 1:2,reaction time 120 min.The product synthesized under the best preparation conditions was used as filtration reducing agent,the aging temperature was 130~140℃.FT-IR analysis showed that the composite starch appeared carboxyl absorption peak at 1609cm-1,the sulfonic acid absorption peak at 1205cm-1 proved successful synthesis of complex etherified starch.