STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

MWD and LWD 949
Pressure (psi)
0 2000 4000 6000 8000 1 OOOO
Figure 4-256. Pressure variation with depth: grid with the solution.
Draw a pressure traverse for each case in the attached graph, use pressure
loss equation given in Data Sheet below.
2. A pressure pulse is generated at bottom. Compute the pulse velocity in the
pipe at bottomhole and at surface, while circulating, assuming a surface temperature
of 25°C and a bottomhole temperature of 85°C. The mud compressibility
is assumed equal to the water compressibility given in Figure 4257.
Compare to the free mud pressure pulse velocity.