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由于实际情况千变万化，在绳索取心钻进中，也不断发生复杂孔内事故。从盐类矿床中施工的绳索取心深井情况看，因盐矿层易溶、易超径，故断钻、塌孔、烧埋钻等事故时有发生。由于绳索取心钻杆壁薄，连接丝扣是粗方扣且扣数少，NQT钻杆内外平整无连接接头，这给处理孔内事故增添了许多麻烦。绳索取心钻进是满眼钻进，硬岩层井段的环空间隙很小，反钻杆时母锥下不去只能用公锥，若用普通反丝公锥也较困难。针对上述情况，我们自制了“枣核锥”，采用起拔大口径套管的方法，来反NQT绳索取心钻杆，经过两个超1700m深孔的实践，得得了一点经验，也弥补了普通反丝公锥之不足，效果良好。
As a result of the ever-changing factual situation, complicated borehole accidents have also occurred continuously in the coring of ropes. From the salt deposit in the construction of the rope coring deep well situation, due to the salt deposit is easy to dissolve, easy to exceed diameter, so broken drill, collapse hole, burned burial and other accidents have occurred. Due to the thin wall of the cord coring drill pipe, the connecting thread buckle is coarse buckle and the buckle is small. The NQT drill pipe is flat and has no connecting joints inside and outside, which adds a lot of troubles to the handling hole accidents. Cord coring drilling is full of eye drilling, hard rock interval of the annular space is small, anti-drill when the female cone can not only use male cones, if the general anti-cone cone is more difficult. In response to the above situation, we made our own “Zaojian cone”, using the method of pulling large diameter casing, to anti-NQT rope coring drill, after two ultra 1700m deep hole practice, gained little experience, but also make up The general lack of anti-cone cone, the effect is good.