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方钻杆旋塞阀(Kelly Cock Valve)

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方钻杆旋塞阀是钻柱循环系统中的手动控制阀,是防止井喷的有效工具之一.方钻杆旋塞阀分上部方钻杆旋塞阀和下部方钻杆旋塞阀。上部方钻杆旋塞阀连接于水龙头下端和方钻杆上端之间下部方钻杆旋塞阀连接于方钻杆下端和钻杆上端或方钻杆保护接头的下端之间方钻杆旋塞阀操作非常简单,用专用扳手按指示要求转动90度即可实现开或关。在钻井作业中,应在方钻杆上、下两端组接方钻杆旋塞阀

Kelly cock valve,which is a manually operated ball valve run in the I.D of drill string,is one of efective tool for preventation from blowont.The kelly cock?is divided into upper kelly cock valve and lower end of swivel and upper end of kelly cock?is connected between upper end of drill pipe and lower end of kelly or connected between lower end of kelly saver subs.The kelly cock features a simple operation,the kelly cock?can be opened on or closed off by only turning the special operation,spanner at 90 degrees according direction During drilling operation,the kelly cock shall be connected at upper end and lower end of kelly.