钻井液用高分子聚合物高温流变特性影响因素探究Factors affecting high temperature rheological properties of polymers used in drilling fluid
朱旭明;乌效鸣;郑文龙;迪娜·木拉提;蒋子为;
摘要(Abstract):
聚合物对钻井液的高温流变特性具有重要影响。对比了聚合物种类、加量、剪切时间、盐、造浆黏土等对聚合物溶液高温流变性的影响,并对不同温度下的剪切速率-剪切应力关系进行了流变模型拟合。结果表明,温度升高、剪切时间及盐量增加均导致黏度降低,超过190℃后黏度下降速率加剧;含5%甲酸盐与5%卤盐的样品黏度在降温阶段的黏度恢复率分别为86.8%和2.7%;以宾汉模式对造浆黏土与聚合物混合液进行拟合,220℃时的动切力最高达到5.47 Pa。温度升高使得聚合物溶液由假塑性向牛顿性演变的趋势增强。高于130℃时,长时间剪切导致黏度下降的趋势明显,此时含甲酸盐的聚合物溶液黏度较含卤盐的高,且降温阶段的黏度恢复率也较高。黏土的存在增强了混合液的网间结构,有利于高温下携带岩屑。
关键词(KeyWords): 钻井液;聚合物;高温流变性;流变模型;黏度
基金项目(Foundation): 中国地质调查局地质调查项目(12120113017600;DD20160209)
作者(Author): 朱旭明;乌效鸣;郑文龙;迪娜·木拉提;蒋子为;
Email:
DOI: 10.19509/j.cnki.dzkq.2021.0115
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