气动潜孔锤钻进技术在黔东南岩溶地区地源热泵勘探井中的应用

Application of pneumatic DTH hammer drilling technique in ground source heat pump exploration well in karst area of southeast Guizhou

气动潜孔锤钻进技术用于地源热泵勘探井施工,在地质条件复杂的黔东南岩溶地区累计钻进568m,不仅查明了拟建项目区地质体的地质条件和可钻性,而且通过钻进工艺的改变,成功地实施了一口测试井,确保了项目的顺利开展。文中分析了岩溶地区的钻遇问题,及时调整思路,结合钻井工艺的改变,并选择气动潜孔锤间接性跟管钻进技术,保证了钻进的连续性,取得的经验体会可供借鉴。

The pneumatic DTH hammer drilling technology has been used in ground source heat pump exploration well drilling in complicated geological conditions in the karst area of southeast Guizhou with accumulative drilling amount of 568m,which has not only found out the geological conditions and drillability of the proposed project area,but also successfully implemented a test well through the change of the drilling process to ensure the smooth development of the project.This paper analyzes the problems encountered in drilling in karst areas.With change of the drilling technique to indirect sim-casing drilling with the pneumatic DTH drilling hammer,the continuity of drilling has been ensured,and the experience gained can be used for reference.