There are a large number of interbedded sandstones in many oil and gas reservoirs in China,and the interbedded sandstones are complicated.When the interbedded sandstones are broken by ordinary flat-tooth PDC bits,various bad conditions such as bouncing and turning are easy to occur,which brings great troubles to rock breaking.To this end,a special PDC axe tooth bit is used and ABAQUS finite element simulation method is used to compare the rock breaking effect of axe tooth and plane tooth in sandwich sandstone.The results show that the special three-dimensional structure of axe teeth has more concentrated shear stress during rock break-ing,which can make it produce more destructive force when embedded in rock,and it is easier to cut into rock,and the rock breaking ability is significantly improved.
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