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南堡12-X168井为冀东油田二号岛第1口大位移井,完钻井深为5 040 m,最大井斜为72.4°,位移达3 802.33 m,水垂比为1.49,钻穿长度为1 068 m的玄武岩地层。该井三开、四开选用氯化钾成膜封堵低侵入钻井液体系(BH-KSM),BH-KSM钻井液具有良好的抑制成膜封堵能力,通过加入聚胺抑制剂、低渗透封堵剂BZ-DFT,将中压滤失量控制在3 mL,密度为1.25 g/cm3就可以平衡地层压力;KCl含量保持在5%～7%之间,抗盐包被抑制剂BZ-BBJ含量为0.2%～0.3%,同时补充聚胺抑制剂和仿沥青、聚合醇,使泥饼有良好的成膜特性。该体系能解决冀东地区馆陶组玄武岩坍塌、东营组掉块问题,是深井、大位移井的首选体系。
Well Nanba 12-X168 is No. 1 large displacement well on No.2 Island of Jidong Oilfield with a drilling depth of 5 040 m, a maximum deviation of 72.4 °, a displacement of 3 802.33 m and a water-vertical ratio of 1.49. The drilling length 1 068 m basalt formation. The well three open, four open selection of potassium chloride film blocking low invasion drilling fluid system (BH-KSM), BH-KSM drilling fluid has a good ability to inhibit the formation of membrane occlusion by adding polyamine inhibitors, low permeability The plugging agent BZ-DFT, the medium pressure filtration loss control in 3 mL, the density of 1.25 g / cm3 can balance the formation pressure; KCl content remained at between 5% to 7%, anti-salt coating inhibitor BZ- BBJ content of 0.2% to 0.3%, while replenishing polyamine inhibitors and imitation asphalt, polymer alcohol, mud cake has a good film forming properties. The system can solve the problem of the basalt collapse of Guantao Formation in Jidong area and the block-off problem in Dongying Formation, and is the first choice system for deep wells and large displacement wells.