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裸眼井段的井眼清洗要求钻井液不能穿透地层 ,且能有效地除去井壁泥饼与裸眼井段和井眼附近的残余流体及阻止地层损害。利用酸溶性加重钻井液和提高井眼清洗效率的包被剂配成的钻井液便能满足上述要求。本文中利用常规的化学增产剂清洗碳酸盐加重的合成基钻井液的效果与利用碳酸钙加重的合成基钻井液的井眼清洗优选评价几种不同互溶剂的包被效果。
Wellbore cleaning in open-hole sections requires that drilling fluid can not penetrate the formation and effectively removes muddy cake from the borehole wall and residual fluid near boreholes and blocks formation damage. The above requirements are met with drilling fluids formulated with coatings that are acid-soluble and add to the wellbore cleaning efficiency. In this paper, the effect of cleaning carbonate-aggravated synthetic drilling fluids with conventional chemical stimulation agents is compared with that of synthetic-based drilling fluids using calcium carbonate-aggravated synthetic drilling fluids.