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

Table 2

Experimental results.

Number	Parameters	Number 1	Number 2
1	Lithology	Coarse siltstone	Fine siltstone
2	Permeability (mD)	105.2	10.2
3	Confining pressure (psi)	4500	4500
4	Annular pressure (psi)	3900	3900
5	Formation pressure (psi)	3000	3000
6	Pressure drop time (/s)	5.0	5.0
7	Withdrawn flow rate (/(ml/s))	1.5	0.5
8	Lowest pressure (psi)	467	50
9	Pressure drop amplitude (psi)	3433	3850
10	Final buildup pressure (psi)	2898	2827
11	Pressure buildup amplitude (psi)	2431	2777
12	Pressure buildup time (/s)	185	1300