开化黄山矿区钻孔偏斜规律研究及控制措施

Study on Borehole Deviation Rules in Kaihua Huangshan Mining Area and the Control Measures

摘要:

在深部矿产资源勘查中，孔深＞500 m的钻孔越来越多，钻孔偏斜问题日显突出。根据浙江省开化黄山矿区萤石矿勘查钻孔测斜数据，对钻孔偏斜的原因从地质条件和施工工艺等方面进行了分析。认为钻孔偏斜有一定的规律可循：斜孔钻进特殊的车轮效应是引起钻孔方位向钻头自转方向偏斜的基本原因；特殊的地质构造和不当的施工工艺是造成钻孔偏斜异常出现的重要因素。因此，预防钻孔偏斜的措施必须从地质设计和钻探施工工艺2方面着手。

Abstract:

In deep mineral resources exploration, more and more boreholes with depth of more than 500m are used, and the deviation becomes increasingly prominent. Based on the inclination survey data from a fluorite ore, the analysis is made on the causes of borehole deviation from the geological conditions and drilling construction technology, the analysis is indicated that there is still some regularities to follow. The special wheel effect is the basic reason which leads drilling azimuth deviation to the rotation direction; the special geologic structure and improper construction technologies are the main factors which cause abnormal drilling deviation. Therefore, the prevention measures must be prepared in geological design and construction process.