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七、钻杆事故专用工具根据绳索取心钻进的工艺特点（外环间隙小），S91绳索取心钻具所配用的钻杆事故工具只有钻杆公锥一种。公锥的锥度与钻杆螺纹锥度相似，并且长度适当。不论钻杆的断口在何处均能有效地进行捞取。公锥上端车有S87G绳索取心钻杆母螺纹，以便与上部钻杆相联。
Seven, drill pipe accident tools According to the rope coring drilling process characteristics (outer ring gap is small), S91 rope coring drill equipped with drill pipe accident tools only a cone drill pipe. The taper of the male taper is similar to the taper of the drill rod thread and is of suitable length. No matter where the drill pipe fracture can be effectively taken. The upper end of the male cone has the S87G rope coring drill rod female thread for connection to the upper drill rod.