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加拿大JKS-BOYLES公司研究制出绳索取芯钻进用的新型TUFF-ROD钻杆,特点是采用螺纹连接结构,加大螺纹节距,提高了均衡性。这种新钻杆的抗拉强度比标准Q系列钻杆提高84％,抗疲劳强度提高226％,能传递较大的钻压和扭矩,从而增加钻孔的深度。钻杆螺纹具有较好的密封性,可减少螺纹受冲蚀的可能性;具有自对中性能,可快速拧接和拧卸;还具有较高的表面硬度,足以降低磨损。这种钻杆是用优质钢制造的,并经过特殊方法硬化处理和矫直,从
Canada JKS-BOYLES company developed a rope core coring drilling with a new TUFF-ROD drill pipe, characterized by the use of threaded connections to increase the thread pitch and improve the balance. The tensile strength of this new drill pipe is 84% greater than that of the standard Q-Series drill pipe and its fatigue strength is increased by 226%. It can transmit larger weight-on-bit and torque and thus increase the depth of drilling. Drill pipe thread with good sealing, can reduce the possibility of thread erosion; with self-aligning performance, quick screwing and unscrewing; also has a high surface hardness, enough to reduce wear and tear. This drill pipe is made of high-quality steel, and after special methods of hardening and straightening, from