PDC Bits-廚房與公婦倫理_好爽好大快噴出來了AV視頻

The PDC drilling bit is a new typeof drilling bit whose matrix(or rigid body) has been embedded byartificial polycrystalline diamond cutting teeth. It is applicableto soft-medium hard formation because of its cutting edge whichreplaced by sharp, wear resistant and self-sharpenable PDC cuttingteeth, its high drilling rate(2 times higher than cone bit) whichcould obtained at low drilling pressure, and its high-footage(4-6times higher than cone bit). The drilling bit has no moving parts,could withstand high drilling rate, and could gain higher economicefficiency by conjunction with the downhole drilling motor. As aresult, it is a strong competitor of the cone bit.