Experimental Study on Blockage Mechanism and Blockage Locations for Polymer-Flooded Reservoirs in the Henan Oilfield

Table 2

Pressure propagation data at pressure measuring points on the sandpack.

Number of PVs injected	Pressure measuring point P1	Pressure measuring point P2	Pressure measuring point P3	Pressure measuring point P4	Pressure measuring point P5	Pressure measuring point P6
1.00	0.031	0.025	0.013	0.000	0.000	0.000
1.50	0.037	0.030	0.018	0.000	0.000	0.000
2.00	0.037	0.030	0.018	0.000	0.000	0.000
2.50	0.058	0.052	0.029	0.005	0.000	0.000
5.28	0.181	0.175	0.135	0.076	0.000	0.000
5.88	0.304	0.164	0.059	0.000	0.000	0.000
7.00	0.669	0.282	0.059	0.000	0.000	0.000
9.00	0.970	0.414	0.110	0.048	0.000	0.000
10.00	1.018	0.440	0.125	0.055	0.000	0.000
12.00	2.152	1.729	1.070	0.396	0.018	0.000
15.00	0.716	0.573	0.301	0.129	0.006	0.000
18.83	0.716	0.573	0.301	0.129	0.006	0.000