Pressure-Predicting Model for Ultralow-Permeability Reservoirs considering the Water Absorption Characteristics of Mudstone Formations

Table 2

Experimental results of the mudstone water absorption.

Core number	Volume (cm^3)	Water invasion pressure (MPa)	Saturation water absorption time (d)	Saturation water absorption flux (cm^3)	Saturated water absorption rate (%)
M-1	40.23	4	8.5	0.76	1.88
M-2	38.27	4	8.5	0.69	1.81
M-3	36.31	4	8.5	0.64	1.76
M-4	37.29	6	14.0	0.71	1.91
M-5	37.78	6	13.5	0.75	1.98
M-6	38.27	6	13.5	0.78	2.04
M-7	38.76	8	15.0	0.84	2.16
M-8	39.25	8	15.5	0.87	2.22
M-9	37.29	8	15.5	0.80	2.14
M-10	38.27	10	18.0	0.88	2.31
M-11	40.23	10	18.0	0.94	2.34
M-12	39.74	10	18.5	0.95	2.38
M-13	37.78	12	20.5	0.94	2.48
M-14	38.27	12	21.5	0.92	2.41
M-15	38.76	12	21.5	0.97	2.49
M-16	39.74	14	23.5	1.00	2.51
M-17	39.25	14	24.5	1.01	2.58
M-18	38.76	14	23.5	0.99	2.55
M-19	38.27	16	24.5	1.00	2.62
M-20	38.76	16	25.0	1.01	2.61
M-21	40.23	16	24.0	1.06	2.64