1.Downhole drilling machine: When drilling a downhole gun hole with a aperture less than 150 mm, in addition to the application of a rock drill, it can also be used to drill a small diameter of 80 ~ 150 mm. When drilling a gun hole with a diameter of less than 70 mm in coal or softer mineral rock, it is generally used to drill or air drill, driven by a motor (or air motor) to drill the drill pipe, and the rock (coal) chips drilled out are discharged through the spiral groove on the drill pipe.
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2025-08-14 04:09
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These seals are typically made from rubber or polyurethane materials and are designed to withstand high pressures and temperatures These seals are typically made from rubber or polyurethane materials and are designed to withstand high pressures and temperatures
Simultaneously, the suction valve opens, allowing new water to enter and the cycle repeats Simultaneously, the suction valve opens, allowing new water to enter and the cycle repeats
