| 摘要 |
This invention relates to a roller bit applying for the oil, natural gas, mi ne and geological drilling, and more particularly relates to a kind of roller b it with the parallel inlayed compacts, it includes head and cone, the compact land a nd the teeth-groove are arranged on the cone, the difference is that there are 2 to 3 compacts having the cylindrical body being arranged on the top of the base teeth along the teeth direction.The cutting performance of the present invention is similar to that of the oblate compacts, and, by utilizing the conventiona l cylindrical compacts, it is not only easy to process and with low manufacturing cost, but the bit can effectively drill through the stringered earth formati on with both hard and soft formation and thus better economic benefit from drilling the stringered formation can be obtained.
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