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人工弯曲钻孔，也就是下偏心楔子来导使钻孔弯曲，以达到钻孔原来设计的要求，这是苏联的先进经验之一，它一般在三种情况下使用。1．所打钻孔的弯曲度已超过了地质设计要求，用来纠正钻孔弯曲。2．发生了复杂的孔内事故，用来避开残留在孔内的钻具。3．在软岩层钻进中，发生岩矿心采取率不足，为了在原孔中补采岩矿心，就必须进行人工弯曲。
Manual bending of the hole, that is, the lower eccentric wedge to guide the drill to bend to meet the original design requirements of the borehole, is one of the Soviet advanced experiences, which is generally used in three cases. 1. The curvature of the drilled hole has exceeded the geological design requirements, used to correct drilling bending. 2. A complicated hole accident occurred to avoid the drill string remaining in the hole. 3. During the drilling of soft rock formations, the occurrence rate of rock and core is not enough. In order to recover the rock core in the original hole, artificial bending must be carried out.