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Negative pulse mode
Nov 26, 2018

The mud negative pulse generator needs to be installed in a dedicated non-magnetic short section to open the drain valve of the mud negative pulse generator, so that the mud in the drill string can flow through the drain valve and the non-magnetic drill collar. When the wellbore is annulus, the mud pressure inside the drill string is reduced, and the action of the bleed valve is realized by the measurement data encoded by the probe through the drive control circuit. The change in riser pressure is continuously detected on the ground and converted into different measurement data by decoding.


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