瓦斯抽采钻孔堵塞段卡钻扭矩力学模型分析  

Analysis of pipe-sticking torque mechanical model for gas extraction borehole clogging segment

作　　者：王永龙[1] 宋维宾[1] 孙玉宁[1] 翟新献[1] 王振锋[1] 

机构地区：[1]河南理工大学能源科学与工程学院

出　　处：《中国安全科学学报》2014年第6期92-98,共7页China Safety Science Journal

基　　金：国家科技支撑计划项目(2013BAA03B02);河南理工大学博士基金资助(60207/003)

摘　　要：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。To analyze the influence of pipe-sticking torque on gas extraction drilling engineering, a pipesticking torque mechanical model was built based on powder mechanics theory, different pressure p and pull-out force F on pipe-sticking torque were analyzed. Results show that for case of non-pressure in borehole, smaller pipe-sticking torque forms in drilling clogging segment, there would be no drilling accidents, that essential reason for formation of larger pipe-sticking torque is radial lateral pressure p, in borehole clogging segment, that torque will increase rapidly with increasing of air pressure p and pull-out force F that a pipe-sticking phenomenon would occur if clogging segment has not been effectively dredged when pipe-sticking torque has reached the maximum torque Tmax of drilling rig, and that drilling accidents are easy to happen if pipe-sticking phenomenon was dealt with improperly.

关 键 词：瓦斯抽采 钻孔堵塞 风压 卡钻事故 卡钻扭矩 

分 类 号：X936[环境科学与工程—安全科学]