Question / Answer

What about Signal Attenuation?

The pulse signal from the downhole tool can be affected by multiple factors.  OBM versus WBM, mud weight and viscosity, measured depth of the well bore, tapered string features.  These factors can all come into play when stopping to obtain a survey, and again when the flow is restarted to pump that survey information to the surface.  As a general rule of thumb, as all of the above factors increase, increase the time to record a survey and realize that it will take longer for the pulses to be detected and decoded.  Start counting survey store time from the time that the flow has stopped and the pressure gages are reading zero.  Set your recorder to maximum sensitivity and start the recorder when you start your pumps on.  Bring your pumps up quickly, but smoothly.