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Kelly cock valve, which is a manually operated ball valve run in the LD of drill string, is one of effective tool for preventation from blowout. The Kelly cock is divided into upper Kelly cock valve and lower Kelly .

The lower Kelly cock is connected between upper end of drill pipe and lower end of swivel and upper Kelly cock is connected between lower ends of Kelly subs. The Kelly cock features a simple operation; the Kelly cock can be opened on or closed off by only turning the special operating spanner at 90 degrees according to indicating direction.

During drilling operation, the Kelly cock shall be connected at upper end and lower end of Kelly.

Upper Kelly Cocks

Lower Kelly Cocks

 
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