Table 3. Average duration of each test...

Table 3.

Average duration of each test until steady flow state and number of tests or realisations (N) to achieve 95% confidence for evaluating the mean equivalent gas permeability at the steady state

Sample size: mm	Average duration: d		N (E = 10%)		N (E = 5%)
Sample size: mm	HP3D^a	LP3D^b	HP3D	LP3D	HP3D	LP3D
10	8	3	39	12	156	49
20	35	9	9	3	36	11
40	125	36	1	1	6	1
80^c	574	146	2	1	7	2

Sample size: mm	Average duration: d	N (E = 10%)	N (E = 5%)
10	8	3	39	12	156	49
20	35	9	9	3	36	11
40	125	36	1	1	6	1
80^c	574	146	2	1	7	2

^aWith gas injection pressure of 5.0 MPa

^bWith gas injection pressure of 2.0 MPa

^cThe results for 80 mm correspond to 2D conditions, since no 3D simulation was conducted for this sample size due to high computational cost

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