离子交换与吸附

有机土作为油基钻井液的关键处理剂，存在在白油相中成胶率低和抗高温性能较差等问题。文章使用十八烷基三甲基氯化铵(OTAC)和自制改性剂HYG对蒙脱土进行复合改性，以提高有机土的成胶率与高温稳定性。通过IR、XRD、TG和XPS等手段对制备的有机土进行表征，结果表明其结构符合预期。对有机土进行成胶率和流变性能测试，结果表明该有机土具有100%成胶率和良好的流变控制性能。将该有机土应用于油基钻井液体系并开展系统性能评价，实验结果表明，该体系具有良好的流变性能、沉降稳定性、乳化稳定性和降滤失性能；232℃下老化16 h后，体系沉降稳定性良好，高温高压滤失量约为6 mL。

Organic montmorillonite, as a key treatment agent in oil-based drilling fluids, has problems such as low gelation rate in the white oil phase and poor high-temperature resistance. This paper introduces octadecyltrimethylammonium chloride(OTAC) and a self-made modifier HYG to conduct composite modification on montmorillonite, aiming to enhance the gelation rate and high-temperature stability of organic montmorillonite. The prepared organic montmorillonite was characterized by IR, XRD, TG and XPS, and the results indicated that its structure met the expectations. Gelation rate and rheological property tests were conducted on the organic montmorillonite, and the results showed that it had a 100% gelation rate and good rheological control performance. The organic montmorillonite was applied to the oil-based drilling fluid system and a systematic performance evaluation was carried out. The experimental results showed that the system had good rheological properties, sedimentation stability, emulsion stability and filtration loss reduction performance. After aging at 232 ℃ for 16 h, the sedimentation stability of the system was good, and the high-temperature and high-pressure filtration loss was approximately 6 mL.