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打捞是井下作业中处理井下事故的常见技术措施之一。复杂打捞一般指入井打捞工具超过3种,打捞次数众多的井下落鱼打捞技术。位于青海省柴达木盆地花土沟构造N3-4-2混井由于水泥卡管柱,落鱼内与油套环空均被水泥固死,套管存在多处变形,加大了打捞难度,属于典型的复杂打捞。通过对该井落鱼情况的分析,制定了一套合理的打捞方案,选用合适的打捞工具,采用对落鱼进行套铣—打捞—磨铣循环打捞,并对常用工具进行加工改造,增加了打捞的成功率,为大修复杂打捞积累了经验。
Salvage is one of the common technical measures to deal with downhole accidents in underground operations. Complicated fishing generally refers to more than three kinds of fishing tools into the well, a large number of salvage the well-fishing technology. Located in the Qaidam Basin Qinghai Trench Structure N3-4-2 mixed well due to the cement pipe stuck column, the fish and the oil ring annulus are cement solid death, the casing there are multiple deformation, increasing the difficulty of recovery , Is a typical complex salvage. Through the analysis of the situation of fish drop in the well, a set of reasonable salvage plan was formulated, the suitable salvage tools were selected, the fishing, milling, salvage, milling and salvage were carried out, and the common tools were reformed, The success rate of salvage, overhaul complex fishing salvaged accumulated experience.