山东黄金西岭勘查区深部勘探孔防斜与纠斜措施

Deviation Prevention for Deep Exploration Hole Drilling in Shandong Xiling Exploration Area and the Straightening Measures

摘要:

西岭勘查区金矿找矿工作已全面进入勘探阶段，勘查区网度为80 m×80 m，对于钻孔质量要求十分严格：终孔靶点偏差不超过勘探网度的四分之一，即不超过20 m。对于西岭勘查区设计孔深均超过1500 m（部分钻孔设计甚至超过2500 m）的钻孔而言，这种要求远远超过地质岩心钻探规程要求。山东黄金地勘公司根据多年深孔施工经验，在防斜与纠斜方面均取得了一些突破，自主研发了钻具扶正器、独创了钻孔纠斜法，形成了一套实用的钻孔质量保证措施。

Abstract:

The prospecting work for gold deposits in Xiling exploration area has entered the prospecting stage, the grid layout was plotted 80m × 80m with very strict drilling quality requirements: the target deviation in the final completion should be less than 1/4 of the exploration grid, that is not exceeding 20m. For the holes in Xiling exploration area, the designed depth were all more than 1500m, some even more than 2500, which is far beyond the requirements of geological core drilling procedures. Based on many years’ experience in deep hole construction, some breakthroughs have been made in deviation prevention and straightening, drilling tool centralizer is independently developed and a borehole straightening method is originated to form a set of practical drilling quality assurance measures.