基于井下岩石表面双疏理论,研发出可在岩石、滤饼和钻具等表面形成纳—微米乳突物理结构并降低表面自由能,具有"防塌、保护储集层、润滑、提速"功能的聚合物超双疏剂并对其进行性能评价。以该超双疏剂为核心,结合钻遇的地层概况,配套其他处理剂形成了超双疏强自洁高效能水基钻井液体系,并与现场用高性能水基钻井液和典型油基钻井液的性能进行对比。结果表明：超双疏强自洁高效能水基钻井液流变性更佳且高温高压滤失量与油基钻井液相当;超双疏强自洁高效能水基钻井液的抑制性和润滑性接近油基钻井液水平;体系无毒且安全环保。现场试验证明,利用该体系解决了钻井过程中井壁失稳、储集层损害和阻卡卡钻严重、钻速慢、成本高等技术难题,满足了安全、高效、经济、环保的钻井需要,与其他钻井液技术相比,同区块井下复杂情况减少82.9%,钻速提高32.8%,钻井液综合成本降低39.3%,日产量提高1.5倍以上。图9表8参15
Based on the amphiphobic theory on underground rock surface, a super-amphiphobic agent is developed and evaluated which can form nano-micro papilla structure on rock, filter cake and metal surface, reduce surface free energy, prevent collapse, protect reservoir, lubricate and increase drilling speed. With this super-amphiphobic agent as the core agent, a super-amphiphobic, strong self-cleaning and high-performance water-based drilling fluid system has been developed by combining with other agents based on drilled formation, and compared with high-performance water-based drilling fluid and typical oil based drilling fluid commonly used in oilfields. The results show that the super-amphiphobic, strong self-cleaning and high-performance water-based drilling fluid has better rheology, and high temperature and high pressure filtration similar with that of oil-based drilling fluid, inhibiting and lubricating properties close to oil based drilling fluid. Besides, the super-amphiphobic system is non-toxic, safe and environmentally friendly. Field tests show this newly developed drilling fluid system can prevent wellbore collapse, reservoir damage and pipe-sticking, increase drilling speed and lower drilling cost, meeting the requirement of safe, high efficient, economic and environmentally friendly drilling. Compared with other drilling fluids, this new drilling fluid system can reduce downhole complexities by 82.9%, enhance the drilling speed by about 18.5%, lower drilling fluid cost by 39.3%, and increase the daily oil output by more than 1.5 times in the same block.
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