井漏不仅是钻井过程中的普遍现象,且是制约安全、快速钻井的重要因素之一。某井钻进至5700m在奥陶系蓬莱坝组发生漏失,通过一系列措施钻进至6640m寒武系阿瓦提格组中部漏失结束,漏失井段达940m;漏失地层岩性主要为粉晶白云岩、云质灰岩、灰质云岩、白云岩为主;75%的漏失发生在钻进过程中,最小漏速为1.8m3/h,最大漏速56m3/h,漏速多数在10~20m3/h。自发生井漏开始,该井采取了降密度、降排量、随钻堵漏、边漏边钻、静止堵漏以及桥塞堵漏等方法成功钻进至漏失结束,共采取了8次桥接堵漏和11次随钻堵漏。从这口井的堵漏经过和成果来看,本井漏失为裂缝型漏失,采用桥接堵漏技术堵漏成功与堵漏配方中架桥颗粒大小、堵漏材料浓度等息息相关。 Lost circulation is not only a common phenomenon in the drilling process, but also one of the important factors restricting safety and rapid drilling. A well drilled to 5700m in the Ordovician Penglaia Dam occurred through a series of measures to the 6640m Cambrian Avatara Formation in the middle of the loss of the end of the missed well section 940m; Dolomite, dolomite, dolomite and dolomite; 75% of the losses occurred during the drilling process, the minimum leakage rate was 1.8m3 / h, the maximum leakage rate was 56m3 / h and the leakage rate was mostly 10 ~ 20m3 / h. Since the beginning of the well leakage, the well has been successfully drilled down to the end of the loss by adopting such methods as densification density reduction, displacement reduction, plugging while drilling, edge boring boring, still plugging and plugging plugging. A total of eight bridges Plugging and plugging while drilling 11 times. From this well of plugging and the results of the view, the loss of this well for the leakage of fractures, the use of bridging plugging plugging the success of the plugging formula in the bridge particle size, plugging material concentration is closely related.