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Figure 5.17b.
Velocities for erosion and pressure analysis.
Finally, we note that an MWD signal arriving uphole from the MWD
pulser will travel to both the desurger and mudpump pistons, reflect and travel
downward - together with higher amplitude pump noise created at the surface.
The wave equation can be solved to eliminate
all
signals traveling in a
downward direction knowing
only
the value of surface sound speed. Figures
5.18a,b show examples of such inverse methods. The “tall, pointy” blue and
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