深部孕镶金刚石绳索取芯钻进技术在铀矿地质中的应用及技术提升研究

Application of rope coring drilling technique with deep impregnated diamond in uranium geology and study on the technique upgrading

随着钻孔深度的不断增加,对绳索取芯钻具的使用性能提出了更高要求。为解决孕镶金刚石绳索取芯钻进技术进行深部地质勘探问题,研究了孕镶金刚石绳索取芯钻进技术在铀矿地质应用中的取芯设计、钻头选择、钻进参数等技术指标,并进行了技术提升研究。研究结果表明:金刚石绳索取芯钻头、硬质合金钻头能够满足孕镶金刚石绳索取芯钻进技术在深部地质勘探中的应用,同时针对不同地层采取不同的取芯策略,保证取芯的完整度及采取率;口径为Φ95mm、Φ122mm和Φ133mm钻头所对应的最优钻压、转速及泵量分别为17.5kN、15kN、19kN,575r/min、375r/min、310r/min及60L/min、91L/min、180L/min;钻探过程中采用低黏增效粉冲洗液取得了良好的效果,并针对5种井漏程度提出了护壁堵漏技术。基于技术提升研究成果,该方法可以解决孕镶金刚石绳索取芯钻进技术在深部勘探中的应用问题。

With the continuous increase of drilling depth, higher requirements are put forward on the performance of rope core drilling tools. In order to solve the problem of deep geological exploration with impregnated diamond rope core drilling technique, the core design, the drill bit selection, the drilling parameters and other technical indicators of the impregnated diamond rope core drilling technique in uranium geology applications are studied, and the technique upgrading is studied. The study results show that the diamond rope core drill bits and the cemented carbide drill bits can meet the application of the impregnated diamond rope core drilling technique in deep geological exploration, while adopting different core strategies for different formations to ensure the coring;the optimal drilling pressure, rotation speed and pump volume corresponding to the drilling bit with diameters of Φ95 mm, Φ122 mm and Φ133 mm are 17.5 kN, 15 kN, 19 kN, 575 r/min, 375 r/min, 310 r/min and 60 L/min, 91 L/min, 180 L/min respectively;the use of low-viscosity synergistic powder flushing fluid in the drilling process has achieved good results, and a wall-protecting and plugging technique has been proposed for the 5 types of lost circulation. Based on the study of technique upgrading, this method can solve the application of the impregnated diamond rope core drilling technique in deep exploration.