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Increment circulating sub

Product Details

Increment circulating sub
Summarization: the Increment Circulating Sub is a type of bypass valve.
Design: the increment circulation sub is made up of body of sub, valve seat, O-ring, shear pin, setscrew and ball.
Use: when well killing job is interrupted because of overflow, high pump pressure, or blocked bit port, you would nipple down the Kelly stem, drop in a steel ball (or nylon ball), make up the kelly stem, and drilling fluid take the ball down to valve seat. By the time the water hole is sealed off and pump pressure is up to 0.5~1.5Mpa higher than the original, the shear pin will be cut off, valve seat move down and open the drain hole, the pump pressure decrease. Now normal circulation or well killing operation can be continued.

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