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在《煤田地质与勘探》1979年第4期刊登的《小口径防斜试验及防斜理论探论》一文中,孙宗颀等同志对钻孔防斜理论进行了深入的探讨,把引起孔斜的地层因素和钻探工艺技术因素归结为“孔底钻具偏离原来轴线方向是引起孔斜的必然条件”,提出“重视改进孔底钻具组的结构,使其轴线尽可能与钻孔轴线接近,在很大范围内可以改善孔
In “Coal Mine Geology and Exploration” No. 4, 1979 issue of “small-diameter anti-deviation test and anti-inclined theory,” a paper, Sun Zongli and other comrades on drilling prevention theory in-depth discussion of the hole caused by oblique The factors of formation and drilling technology are summed up as follows: “The deviation of the bottom hole tool from the original axis direction is the inevitable condition that causes the hole to be inclined.” It is proposed that "the structure of the bottom hole assembly should be improved so that its axis is as close as possible to the axis of the hole, Hole can be improved to a large extent