In order to study the rock breaking efficiency of the annular-grooved PDC bit, a test bit with adjustable diameter of 241.3 mm was designed and manufactured. The test bit was used for bench test with adjustable parameters such as width, height, number and radial position of annular groove in two rock samples of sandstone and granite. The results show that compared with conventional PDC bit, the rock-breaking mechanical specific energy (MSE) of the annular-grooved PDC bit is reduced by 33%, and the more the number of the annular groove is, the smaller the rock-breaking mechanical specific energy is and the faster the mechanical bit is; The annular groove is disposed outside and in the core of the bit. The smaller the rock-breaking mechanical specific energy of the bit is, the faster the mechanical drilling speed is; In the sandstone and granite samples, there is an optimal annular groove size (height and width), and the bit’s mechanical drilling speed has been increased. Among them, the speed increase is the most obvious in the sandstone, and the mechanical bit is increased by 27% to 160%. The rock mechanical specific energy is reduced, indicating that annular-grooved PDC bit is suitable for both soft and hard lithology, and has a speed-up effect on both types of strata.

为了研究环形沟槽PDC钻头的破岩效率，设计并制造了直径241.3 mm可调的测试钻头。该测试钻头用于台式测试，具有可调参数，例如在两个砂岩和花岗岩岩石样品中的环形槽的宽度，高度，数量和径向位置。结果表明，与常规的PDC钻头相比，环形开槽的PDC钻头的破岩机械比能（MSE）降低了33％，环形槽数越多，破岩量越小机械比能，机械位越快；环形凹槽布置在钻头的外部和内部。钻头的破岩机械比能越小，机械钻速越快；在砂岩和花岗岩样品中，存在最佳的环形凹槽尺寸（高度和宽度），并且钻头的机械钻孔速度有所提高。其中，速度的增加在砂岩中最为明显，机械钻头增加了27％至160％。岩石机械比能降低，表明环形开槽的PDC钻头既适用于软岩层，也适用于硬岩性，并且对两种类型的地层都有加速作用。