贵州碳酸岩地层地热深井空气潜孔锤钻进技术应用研究

Research and Application of Air DTH Hammer Drilling Technology for Deep Geothermal Well in Guizhou Carbonate Formation

研究了空气潜孔锤钻井工艺在贵州省碳酸盐岩地层地热深井中的应用,涉及溶隙、裂隙发育,涌水、漏风、掉块、排渣困难等情况频发的碳酸盐岩地层的10~1100 m井段和216~406 mm井径的条件,探讨了在这样环境下空气潜孔锤钻进机具设备配置、钻具组合和钻进参数;分析了空气潜孔锤钻进工艺钻进过程中的常见问题并提出了相应的技术措施;总结了深井碳酸盐岩地层复杂井况的空气潜孔锤钻进效率与经济效益。研究结果表明,通过合理的设备机具配置和技术措施,可有效提高贵州省碳酸岩层空气潜孔锤钻进效率,进而大幅度提高贵州地热深井的钻进效率和经济效益。

The research is made on the application of air DTH hammer drilling technology for geothermal wells in the car- bonate formation of Guizhou Province. In a well section of 10 -1100m in depth with 216 -406mm in diameter, cracks and fractures develop ; water gushing, air leakage, block falling and difficult slag discharge frequently occur. In this paper, the DTH hammer equipment configuration, bottom hole assembly and drilling parameters in such complicated conditions are discussed; common problems in the drilling process with air DTH hammer drilling technology are analyzed and the corre- sponding technical measures are put forward. This paper also summarizes the drilling efficiency and economic benefit of air DTH hammer used for deep well driUing in the complex conditions of carbonate formation. The study results show that by reasonable equipment configuration and technical measures, the drilling efficiency of air DTH hammer can be effectively improved, which is great beneficial to deep geothermal wells of Guizhou Province.