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中文摘要：
实验研究了阳离子型黏弹性表面活性剂十六烷基三甲基溴化铵(CTAB)溶液的流变性、抗温性、降滤失性及配套破胶剂的破胶性能。实验结果表明:将2%CTAB与3%助剂水杨酸钠NaSal混合的基液在剪切速率170s-1、温度25℃、pH=7的情况下混合均匀后能迅速增黏至160 mPa·s;加入少量复合降滤失剂LA(水解聚丙烯腈铵(NH4-HPAN)和磺化酚醛树脂(SMP-Ⅱ)混合而成的复合体系)可显著降低其常温常压滤失量;高效破胶剂Br的破胶性能良好,破胶液的黏度降至1~3 mPa·s。同时室内研究了以阳离子型黏弹性表活性剂CTAB为主剂的钻井液体系——表面活性剂胶束钻井液DIF-a:1.5%CTAB+2.0%NaSal+1.2%复合降黏剂LA+0.5%黄胞胶XC,结果表明:在钻探碳酸盐岩地层时钻井液体系DIF-a产生的流动摩阻小、降滤失性能较好,且钻完井后利于返排,储层渗透率保留率可以达到91.41%,大大降低外部流体对储层造成的损害。
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