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摘要: 与水基钻井液相比,油基钻井液更容易发生井眼漏失,且井漏现场处理困难,一旦发生井漏,往往会造成重大经济损失。针对油基钻井液漏失问题,从油基钻井液井漏预防措施入手,通过优选不同类型的钻井液防漏堵漏剂,研制了新型油基钻井液随钻防漏堵漏材料,并探讨了其协同作用机理。渗透性封堵实验以及作用机理分析表明,刚性架桥颗粒、弹性填充颗粒、微细纤维材料等不同类型钻井液防漏堵漏剂具有协同作用效果,能够迅速形成具有"强力链网络"的致密封堵层,显著提高了油基钻井液的随钻防漏堵漏性能。进一步优化了强封堵性油基钻井液体系,该体系在120℃、16 h热滚前后的流变性、滤失性能良好, PPA砂盘滤失量仅为11.4 mL,具有良好的随钻防漏堵漏性能,能够起到强化封堵井壁作用,有助于提高地层承压能力。Abstract: Different lost circulation materials have been selected and tried to prevent loss of oil base mud which always resulted in much higher drilling cost compared with water base drilling fluid. A new lost circulation material (LCM) was developed for use in oil base drilling fluids. This LCM is a lost circulation prevention while drilling agent, and is compatible with many other LCMs. In laboratory studies, rigid bridging particles, elastic packing particles and fine particles of fibers work synergistically, and can swiftly form dense plugging and sealing layers to prevent lost circulation of oil base drilling fluids. An oil base drilling fluid formulated with this LCM is tested for its properties before and after hot rolling (at 120℃ for 16 h). This fluid has filtration rate through PPA sand bed of only 11.4 mL, and it also has satisfactory rheological properties.
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