Study and Verification of a Physical Simulation System for Formation Pressure Testing while Drilling

Figure 12

Debugging data of annular pressure, pore pressure, confining pressure, and thrust force under a given value in 1000 seconds. (a) Annular pressure versus time. (b) Formation pressure versus time. (c) Confining pressure versus time. (d) Thrust pressure versus time.

(a)

(b)

(c)

(d)