雪峰弧构造带钻孔轨迹控制关键技术研究

Study of drilling trajectory control for improving exploration accuracy in Xuefenghu structural belt

摘要:

随着近年来矿产资源勘查要求的提高，岩心钻孔的深度及地层复杂性也不断加大，为能精准的钻遇靶区矿体以实现地质目的，对钻孔轨迹控制的要求越来越高。雪峰弧构造带部分工作区地层倾角大、软硬交替频繁、地层破碎，实际施工中地层造斜情况严重，随着孔深增加导致终孔轨迹与靶区矿体偏差较大，影响矿产资源勘查的精度和质量。通过对该工作区地层造斜情况的深入分析，在ZK1001钻孔绳索取心钻进施工中采用初级定向孔技术和满眼钻具工艺，大幅度提高了钻孔孔身质量，较好地实现钻孔轨迹控制。并通过试验不同的岩心钻具组合，提出了满眼钻具组合的优化意见和建议，为工作区岩心钻孔轨迹控制提供技术参考。

Abstract:

With the increase of mineral resources exploration requirements in resent years， the depth of core drilling is rising and the encountered formations are more and more complex. In order to get the ore body in the target area accurately to realize the geological purposes， the requests to control the drilling trajectory is higher. In some working areas of the Xuefenghu structural belt， the dip angle is large with frequent alternation of the soft and hard layers and broken strata. The stratum deflection is serious during the practical construction. As the hole depth increases， the deviation from the ore body in the target area become larger， which affects the exploration accuracy and quality of the mineral resources. In this paper， through deeply analysing the formation deflection， the primary directional technology and the full-hole drilling tool technology are used in the ZK1001 drilling construction， which greatly improves the quality of the borehole and better controlling the drilling trajectory. Moreover， different core drilling tool combinations in different hole sections are tested， some opinions and suggestions for optimizing drilling tool assemblies are put foward， which provides technical reference of drilling trajectory control for coring hole in the working area.