咪唑类离子液体对水基钻井液抑制性的影响及机理

发布时间：2018-08-01 16:09

【摘要】：油气钻井过程中泥页岩不稳定主要是由于泥页岩的水化作用造成。本文采用页岩滚动回收率法、毛细管吸入时间法和粒度分析法3种方法,与传统抑制剂KCl和新型抑制剂聚胺作对比,评价了离子液体RIL作为抑制剂对水基钻井液抑制性能的影响。结果表明高温作用下低浓度(质量分数0.05%)的离子液体RIL有着优异的抑制黏土膨胀和分散的能力,其抑制效果优于5%KCl,与2%聚胺相当;同时低浓度的离子液体RIL可以改善水基钻井液的高温流变性而不会使钻井液的滤失性变差。通过接触角和热稳定性测试分析了其抑制机理。离子液体RIL改性后的Na蒙脱土润湿性从亲水性向疏水性转变,可以阻止水分子进入Na蒙脱土的层间结构从而抑制Na蒙脱土的膨胀和分散。低浓度的离子液体RIL改性后的钠蒙脱土具有更好的热稳定性,可以提高高温作用下水基钻井液的抑制性。
[Abstract]:The instability of shale during oil and gas drilling is mainly due to the hydration of shale. In this paper, the shale rolling recovery method, capillary suction time method and particle size analysis were used to compare with the traditional inhibitor KCl and the new inhibitor polyamine. The effect of ionic liquid RIL as an inhibitor on the inhibition performance of water-based drilling fluid was evaluated. The results show that the low concentration (0.05% by mass fraction) of ionic liquid RIL at high temperature has excellent ability to inhibit the swelling and dispersion of clay, and its inhibitory effect is better than that of 5KCl, which is equivalent to 2% polyamine. At the same time, low concentration of ionic liquid RIL can improve the high temperature rheology of water-based drilling fluid without making the filtration of drilling fluid worse. The inhibition mechanism was analyzed by contact angle and thermal stability test. The wettability of Na montmorillonite modified by ionic liquid RIL changes from hydrophilicity to hydrophobicity, which can prevent water molecules from entering the interlayer structure of Na montmorillonite and thus inhibit the expansion and dispersion of Na montmorillonite. The sodium montmorillonite modified by low concentration ionic liquid RIL has better thermal stability and can improve the inhibition of water-based drilling fluid at high temperature.
【作者单位】：中国地质大学(北京)工程技术学院;国土资源部深部地质钻探技术重点实验室;
【基金】：国家自然科学基金(51204150) 北京市自然科学基金(3123042)项目
【分类号】：TE254.4

【相似文献】