土耳其卡赞天然碱溶采对接井堵井原因分析及修复

Blockage in intersected solution mining well sets and workover techniques of Kazan Trona Mine in Turky

摘要:

土耳其卡赞天然碱矿由于地质条件复杂，首采层不溶物含量高，矿层倾角大，在商业开采过程中易发生堵井事故。本文以P078水平对接井组为例，介绍了其施工工艺和注采井史，分析了引起井组堵塞的原因。遵循“先易后难、降低风险、控制成本”的原则，先后进行了直井单井循环、固井泵车压井和循环泥浆清理井底等各种尝试，最后提出了分支侧钻重新连通的技术方案，并成功修复了溶采通道，恢复了井组的正常生产。并在钻井施工组织、修井设计与施工和溶采作业等方面提出了建议。该技术对类似故障井组的修复具有一定的指导作用和借鉴意义。

Abstract:

Kazan Trona Mine in Turky is characterized by complicated geological settings, high content of insolubles in the primary mining layer and high dip angles of ore beds, which leads to frequently blockage problems during commercial solution mining. This paper takes Unit P078 horizontal intersected well as an example to describe the drilling techniques and leaching history, and analyze the causes of blockage. By following the principle of “from easy to difficult, minimizing risks and controlling the cost”, various attempts were taken to deal with the problem, such as single well circulation, pressurizing the channel by cementation truck, and circulating drilling mud to clean the borehole, and finally, it was decided that sidetracking was applied to drill a lateral to connect both targets, and it was proved to be successful with minimum costs and low risks. Some suggestions related to construction, design, repair and solution mining operations were put forward. The experience can provide some guidance and reference for solving blockage problems in the similar scenario.