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US2020347680A1
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Polycrystalline Diamond Compact and Drilling Bit
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Roller bit bearing single metal sealing structure
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All-metal screw rod drilling tool
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Screw drill motor
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Multi-jetflow bodied tricone bit
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Heat transfer system utilizing normal temperature compressor to compress cryogenic medium
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Sealing-type screw drill transmission shaft assembly
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Low-torque sealing lubricating grease resistant to high temperature and low temperature and preparing method thereof
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Impregnated tooth applicable to high-abrasiveness hard formation and preparation method thereof
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Detachable type diamond compact
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Steel PDC drilling bit with erosion-proof tooth cavities
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Non-emptying unloading start-up system and non-emptying unloading start-up method for compressor
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