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Incremental Circulating Joint
The incremental circulating joint(be also called??by-pass valve?ˇę)is one of the common frilling column accessories in oilfield well-drilling toolsˇę?Main use and construction are as followsˇę?
Useˇę?When overflow occursˇę?and water hole of drilling bit iS blocked SO that weIl can?¨¤t be pressed in the process of welI drilling?you may open the incremental circulating ioint to circulate or press wellˇę?You must connected it on drilling bit or nearby drilling bit before drilling out oil gas layer?
Con structionˇę?the incremental circulating joint is consists of joint bodyˇę?valve bodyˇę?O-shapa seal ringˇę?pinˇę?ejecting screw and ball etcˇę?Its main vonstruction is as lower drawingˇę?
Using methodsˇę?When the incremental circulating joint is connected on the drilling column the balI can?¨¤t be thrown into it firstˇę?When overflow occurs and starting pressure of pump is too high or can?¨¤t passˇę?you may open the circulating mouth of the incremental circulating joint as followsˇę?
1ˇę?Dismount the square driIling rod and throw it into the ball attached by productsˇę?
2 Joint the aquare drilling rodˇę?
3ˇę?Send the ball to the mouth of the valve body circularlyˇę
4ˇę?Improve the pump pressure to be more then specified sheering pressure of 35KN for pinˇę?and shear it when water hole iS sealedˇę?
5ˇę?After the pin is shearedˇę?the valve body moves downwardsˇę?the circulate hole on the joint body is openedˇę?and the pump pressure drops downˇę?you circulate normally or press wellˇę?
Technical Specification

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