急流河段钻机垂直导向技术的分析与应用

Analysis and Application of Vertical Guidance Technology of Drilling Rig in Rapids Reach

钻机系统是炸礁工程船的配套设备。在急流河段中施工,水下礁石岩层较厚,水流湍急、水位变化大,钻机套管壁与卡盘所受冲击力变大,导致套管强烈震动无法进行正常施工。文章通过实践总结研发了钻机垂直导向技术及钻机桁架支撑系统,在钻机卡盘的行程之外增加导向盘。按照急流滩最大流速计算套管所受极限工况,通过动平衡计算,确定卡盘推进和提升套管的稳定系统及导向盘之间的间距。通过使用钻机垂直导向技术,当流速达到6.5 m/s时,钻机套管升降系统操作稳定,垂直度偏差小于0.8%。

The drilling rig system is the supporting equipment of reef blasting engineering ship.During construction in the rapids,the underwater reef rock layer is thick,the water flow is turbulent,the water level changes greatly,and the impact force on the casing wall and chuck of the drilling rig becomes larger,resulting in strong vibration of the casing and failure of normal construction.Through practice,this paper summarizes and develops the drilling rig vertical guidance technology and drilling rig truss support system,and adds the guide plate outside the travel of the drilling rig chuck.The limit condition of casing is calculated according to the maximum flow velocity of rapids,and the distance between the stability system and guide plate of casing is determined by dynamic balance calculation.Using the rig's vertical steering technology,the rig's casing lift system operated stably at a flow rate of 6.5 m/s,with a verticality deviation of less than 0.8%.