土耳其卡赞碱矿对接井水溶开采技术创新综述

Review on innovative techniques for solution mining with intersected well sets at Kazan Trona Mine in Turkey

摘要:

土耳其卡赞碱矿钻井项目主要利用高精度中靶技术使定向水平井与垂直井在碱层中对接后进行水溶开采的方法。该项目通过长期大量的钻井工作，在已有的钻井技术与地质条件基础上，改进完善了与地层相适应的钻井技术，建立了矿区三维地质模型，设计应用了水平分支对接井，优化了钻井轨迹设计，建立起非矿层与矿层的基准物探测井响应曲线，探索出矿区地层致斜机理及相应钻井防斜措施，研究并应用了各种井底钻具组合与设备，采用了提高水平钻井轨迹控制精度的技术方法。上述多种水溶采矿钻井技术创新措施的应用，提高了矿山规划能力、降低了施工成本、提高了资源回采率、缩短了施工工期、降低了劳动强度、提高了钻进效率、减少了施工用地以及对环境的破坏。可为天然碱矿及可溶性矿产的整体矿山规划，以及钻井水溶采矿技术的提高提供借鉴。

Abstract:

Solution mining of Kazan Trona Mine in Turky is realized by the intersected well set, which is formed by drilling of one horizontal well to intersect one or more vertical wells with help of the high accuracy targethitting guidance system. On the basis of the previous longterm experience, the existing drilling techniques and geological characteristics of the mine, a series of innovative drilling techniques have been developed for the purpose of better exploiting the mine, including the strataspecific drilling techniques, the 3D geological model for the mine, the design and application of intersected wells with horizontal branches, the optimization of the horizontal well trajectory design, the setting up of the standard geophysical logging response curves for the ore and nonore ledges, the deviation control methods based on the study on the formation deflecting mechanism, proper combination of various BHAs, the technique to improve control of the horizontal drilling trajectory, etc. A lot of benefits have been achieved by the application of these techniques, such as the improvement of the planned productivity of the mine, reduced well construction cost, enhanced recovery of the trona resources, decreased construction period, raised drilling efficiency, and minimum impact on environment. The innovative techniques can be referred as a guide for the planning of trona or other soluble mines, and for the construction of intersected well sets.