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Sanyuan Petroleum Bits Plant introduces the patented technology (Patent No.XL96240609.0) for design and manufacture of the overall inside diamond drill bits of PDC and TSP. The crown outline shape comprises the para curve, median conic section, and circle, wherein the bit with the crown outline shape of the para curve can be used in various soft formations and has the advantages of large drilling footage, high rate of penetration and good stability. The bit with the crown outline shape of the median conic section and the circle has small working area, centralized water power, good penetration performance, high stability, safe and reliable use, and is applied in the turn plate and downhole drilling tool.