Began to appear along the drill inclination (SWD) (Survey While Drilling);
Later there was measurement MWD (measurement while drilling);
Measurable content: well inclination parameters (well inclination angle, well inclination azimuth); orientation parameters (tool face angle); formation parameters (resistance, gamma, etc.); process parameters (bit pressure, rotation speed, etc.); mud parameters (wells Temperature, pressure, etc.);
Three major components of MWD:
Downhole measurement section: sensors with various parameters, output measurement signals, etc.
Signal transmission part: encoder, transmission part, power part;
Ground receiving parts: decoder, calculation, display, storage, printing, etc.
In three parts, the most difficult part of the transmission.
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