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Electromagnetic induction MWD (Measurement While Drilling) data transmission system
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Stick-slip vibration shock absorber of (polycrystalline diamond compact) PDC drill head
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Energy storage type salvageable underground hydraulic impulse tool
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Impregnated PDC bit
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Magnetic induction type signal transmission drill pipe joint
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Device for preparing flaky cuttings
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Micro-coring PDC bit
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Quick anode dismounting method for underwater cathode protection
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Method for quickly removing petroleum hydrocarbon components in drilling cuttings
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Method for correcting depth trace of self-adapting well drilling
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While-drilling multi-frequency direction induction resistivity survey instrument
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While-drilling borehole compensation electromagnetic wave resistivity survey apparatus
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Testing device of mud pulse generator
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Device for testing stable platform
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Inclination-resisting PDC drill bit
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Feeding and salvaging tool of electronic single/multi-point measurement instrument suitable for gas drilling
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Transverse shock absorber applicable in gas drilling
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Automatic vertical well drilling tool utilizing aerodynamics
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Method for leak stoppage of solid expansion pipe
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Apparatus for testing driller reader
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