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我分队在一个铁矿区进行勘探评价,由于钻孔严重弯曲,以致施工效率低,质量差,报废工程多,影响矿山建设.过去一直没很好地解决钢粒钻进的防斜问题.74年以来,我们根据本矿区孔斜规律,采用厚壁岩心管加长粗径钻具的措施,控制顶角的变化从而达到稳定方位角之目的.一、厚壁岩心管防斜效果我们抓住钻孔顶角上漂幅度过大而导致方位角改变这一主要矛盾,从控制顶角上漂着手,采用厚壁岩心管加长粗径钻具的措施,使方位角变化幅度减小,取得了较好效果.表1所列为钻孔平均深度大致相同的情况下,采用厚壁岩心管防斜与采用普通岩心管钻进时钻孔弯曲情况的对比.
My team conducted an exploratory evaluation in an iron ore district, and due to the serious bending of the borehole, the construction efficiency was low, the quality was poor, and many scrapped projects affected the mine construction. In the past year, according to the rule of borehole inclination in this mine, we adopted thick-walled core pipe to lengthen the large-diameter drilling tools to control the change of apex angle so as to achieve a stable azimuth. The main contradiction caused by the drift of the azimuth at the top of the apex is that the azimuth angle is changed greatly. The hand drifts from the control apex, and the thick core drill pipe is used to lengthen the diameter drill. Good results Table 1 lists the average depth of about the same drilling case, the use of thick-walled core pipe anti-oblique and ordinary core pipe drilling drilling bending comparison.