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Positive pulse mode
Nov 23, 2018

mc

As shown in Fig. 2, the relative position of the needle valve and the small hole of the mud positive pulse generator can change the cross-sectional area of the mud flow passage, thereby causing the mud pressure inside the drill string to rise, and the movement of the needle valve is by the probe tube. The encoded measurement data is implemented by a drive control circuit. Since the electromagnet directly drives the needle valve, it takes a lot of power, and usually uses the power of the mud to adopt a small valve to push the structure of the valve. The change in riser pressure is continuously detected on the ground and converted into different measurement data by decoding.

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