Numerical Investigations of the Effect of Nonlinear Quadratic Pressure Gradient Term on a Moving Boundary Problem of Radial Flow in Low-Permeable Reservoirs with Threshold Pressure Gradient

Table 1

Comparison data for the computed dimensionless formation pressure distribution and relative errors.

Computed dimensionless formation pressure distribution (, )
()	()	/%	()	()	/%	()	()	/%
1	23.48	25.17	7.20	25.73	28.88	12.24	27.32	32.65	19.51
50	12.55	13.73	9.40	14.42	16.94	17.48	15.17	19.72	29.99
100	9.09	10.05	10.56	9.68	11.99	23.86	9.06	13.28	46.58
150	6.45	7.34	13.80	5.72	7.91	38.29	3.61	7.63	111.36
200	4.22	5.03	19.19	2.11	4.15	96.68	0	2.4	*
250	2.24	2.98	33.04	0	0.65	*	0	0	*
300	0.45	1.14	153.33	0	0	*	0	0	*
350	0	0	*	0	0	*	0	0	*

^*denotes the null data.