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Bypass type spherical float valve
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High-efficient wire brush scraper
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Bidirectional cylindrical spring plug valve
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Double-slip hydraulic anchoring packer for window sidetracking
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Method for improving cutting efficiency of grinding shoe and fracture centering grinding and milling shoe used in method
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Hydraulic bendable pen point device
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Anti-falling type reaming device
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Settlement compensation method and settlement compensator for offshore drilling
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Straight edge stabilizer with replaceable sleeve
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Hydraulic shaping device and shaping method
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Casing pipe scraper
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Protection device for sealing working face of petroleum downhole tool
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Pulse torsion reversing device for well repair
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Damping method of top drive protection damper and top drive protection damper
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Method for measuring three-spiral stabilizers with different diameters and equal pitches
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Improved method and structure of plug valve
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A kind of connection method of anti-back button and structure for bearing positive and negative high torque
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anti-sticking stabilizer
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A kind of device and method of rapid survey abnormal shape stepped hole
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A kind of monoblock type top drive cock
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