抗超高温油基钻井液润湿剂的研制及作用机制

Development and mechanism analysis of wetting agent for oil-based drilling fluids with ultra-high temperature resistance

摘要

针对超高温条件下油基钻井液悬浮稳定性差、重晶石易沉降的难题,采用十二烷基苯磺酸和N-氢化牛脂基-1,3丙撑二胺合成一种抗超高温油基钻井液润湿剂NSR,该润湿剂初始热分解温度为220 ℃,油水界面张力为1.12 mN/m。在白油和油基钻井液中评价NSR的润湿性能。结果表明:NSR具有良好的抗温性能,抗温可达220 ℃;NSR能有效吸附于重晶石表面,将重晶石表面由亲水改变为亲油,显著改善重晶石在白油中的分散性,从而提高重晶石在白油中的悬浮稳定性;NSR具有较好的配伍性,在显著改善油基钻井液流变性的同时对油基钻井液的稳定性影响较小。

Abstract

To address the challenges of poor suspension stability and barite settling in oil-based drilling fluids under ultra-high temperature conditions, an anti-ultra-high-temperature wetting agent (NSR) for oil-based drilling fluids was synthesized in this study using dodecylbenzenesulfonic acid and N-hydrogenated tallow-1,3-propylenediamine. The initial thermal decomposition temperature of NSR was 220 ℃, and it achieved an oil-water interfacial tension of 1.12 mN/m. The wetting performance of NSR was evaluated in both white oil and a base drilling fluid slurry. Experimental results demonstrated that NSR exhibits excellent temperature resistant performance, withstanding temperatures up to 220 ℃. NSR effectively adsorbs onto the surface of barite, transforming it from hydrophilic to lipophilic, thereby significantly improving the dispersion of barite in white oil and enhancing its suspension stability. Furthermore, NSR showed good compatibility with the drilling fluid system, markedly improving the rheological properties of the oil-based drilling fluids while having minimal impact on its overall stability.

关键词

抗超高温 / 油基钻井液 / 润湿剂 / 悬浮稳定

Key words

ultra-high temperature resistance / oil-based drilling fluids / wetting agent / suspension stability

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基金资助

国家自然科学基金基础科学中心项目(52288101)