Design of multi-channel continuous cable duct for double-bit self-balancing drilling system
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摘要: 为解决矿山灾害钻孔救援过程中地面钻机对地下钻头“长臂管辖”式驱动导致的钻进效率低、对孔壁扰动大和起下钻辅助时间长等问题，提出了无钻机双钻头仿生自平衡连续缆管钻进技术，而多功能连续缆管设计是该技术的重点和难点之一。为此，根据自平衡钻进系统的需求，从功能、结构、参数三大方面对多通道连续缆管进行设计。为实现连续钻进，多通道缆管需要同时具备泥浆循环、电能与信号传输和电磁屏蔽等功能，此外，还要具有足够强度和良好的弹性。对缆管的铠装缆线外径、内管与外管内外径参数进行设计并计算钻井液环空上返流速，计算结果表明缆管内外管直径参数设计满足最低上返流速要求。采用理论计算与数值模拟相结合的方法对缆管的关键部件进行受力分析，对外管抗拉压弯强度及外管壁抗挤压强度等进行强度校核。结果表明：多通道连续缆管结构设计合理，性能可靠，能够满足无钻机双钻头仿生自平衡钻进系统的技术要求，为矿山灾害无钻机双钻头仿生自平衡钻孔救援工作提供一种安全可靠、快速机动的多通道连续缆管技术和方法。Abstract: The problems, such as low drilling efficiency, large disturbance to the hole wall and long assistance time of tripping caused by the “long arm jurisdiction” drive of the ground drilling rig to the underground drill bit, are faced during the drilling rescue of mine disaster. In order to solve these problems, the bionic self-balancing continuous cable duct drilling technology of double drill bit without drilling rig was proposed, the design of the multi-function continues cable duct is one of the key and challenging aspects of this technology. In terms of the technology, a multi-functional continuous cable duct with built-in channels of power supply, signal and chip removal is required. Therefore, the multi-channel continuous cable duct was designed according to the needs of the self-balancing drilling system from three aspects: function, structure and parameters. For continuous drilling, the multi-channel cable duct should have the functions of mud circulation, electrical and signal transmission, and electromagnetic shielding, as well as sufficient strength and good elasticity. Further, the parameters of the outer diameter of the armoured cables for the cable duct, as well as the inner and outer diameters of the inner and outer pipes, were designed, and the upward reflux rate of drilling fluid in the annulus was calculated. The calculation results show that the diameter parameters of the inner and outer pipes of the cable duct meet the requirements of the minimum upward reflux rate. Therefore, force analysis was conducted for the key components of the cable duct with the theoretical calculation and numerical simulation in combination. Meanwhile, the tensile strength, compressive bending strength and extrusion strength of the outer pipe wall were checked. The results show that the multi-channel continuous cable duct is designed with reasonable structure and reliable performance, which could meet the technical requirements of the bionic self-balancing drilling system of double drill bit without drilling rig. Generally, a safe, reliable and fast mobile multi-channel continuous cable duct technology and method is provided for the bionic self-balancing drilling rescue work of the double drill bit without drilling rig for mine disaster.
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Key words:
- double bit /
- self-balancing drilling /
- multi-channel /
- continuous cable duct /
- drill rescue
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图 5 单芯6 mm2 和4 mm2 铠装缆线截面
Fig. 5 Cross section of 6 mm2 and 4 mm2 armored cable with single core
表 1 不同电机的额定电流对应铠装缆线外径
Table 1 Rated current of different motors corresponding to the outer diameter of armored cables
铠装缆线类型 额定电流/A 铠装缆线外径/mm 单芯6 mm2 26 8 单芯4 mm2 6 6 16芯0.2 mm2 0.02 8 
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表 2 310S不锈钢力学性能参数
Table 2 Mechanical parameters of 310S stainless steel
弹性模量/GPa 抗拉强度/MPa 屈服强度/MPa 密度/(g·cm−3) 184 650 362 7.98
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表 3 电缆最小允许弯曲半径
Table 3 Minimum allowable bending radius of cables
序号 电缆种类 最小允许弯曲半径与
电缆外径的比值1 交联聚氯乙烯绝缘电力电缆 15 2 多芯控制电缆 10 3 310S不锈钢 20
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