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为分析卡钻扭矩对瓦斯抽采钻孔施工的影响,基于粉体力学理论,建立孔内无压和孔内有压卡钻扭矩力学模型。分析钻孔堵塞区间风压p和钻机起拔力Fc对卡钻扭矩的影响规律。研究结果表明,对于孔内无压情况,形成卡钻扭矩较小,一般不会形成卡钻事故;因堵塞段孔内压力作用形成的孔壁径向侧压力pc是形成较大卡钻扭矩的本质原因,风压p和钻机起拔力Fc的增大将导致卡钻扭矩迅速增大,当卡钻扭矩达到了钻机的最大扭矩Tmax,堵塞段未被疏通时,将出现卡钻现象,处理不当容易造成钻杆破断、钻孔瓦斯燃烧、CO中毒等孔内事故。
In order to analyze the influence of stuck-drilled torque on gas drainage drilling construction, based on the theory of powder mechanics, a torque mechanical model with pressure-free hole and pressure stuck in the hole was established. The influence of the wind pressure p and the pull-out force Fc of the blockage on the torque of the stuck-on drill was analyzed. The results show that, in the case of no pressure in the hole, the formation of less stuck drill torque, generally do not form a stuck pipe accident; due to the pressure inside the block hole formed by the radial wall pressure pc is to form a larger card drill torque The nature of the reasons, the wind pressure p and drill lifting force Fc will lead to an increase in rapid increase in the chucking torque, when the chucking torque reaches the maximum torque of the drilling rig Tmax, blockage has not been dredged, there will be stuck phenomenon, improper handling Easily lead to drill pipe breaking, drilling gas combustion, CO poisoning and other holes within the accident.