Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs

Table 2

Pore size distribution in the Keshen Block.

Particle size distribution (μm)	Sample (%)
	#1	#2	#3	#4
0-0.017	0.00	0.00	0.00	0.00
0.0170-0.0283	5.60	13.39	21.19	67.24
0.0283-0.0471	41.69	61.86	53.29	22.18
0.0471-0.0785	24.34	20.09	21.97	0.00
0.0785-0.1307	19.04	1.43	0.00	6.04
0.1307-0.2176	8.02	3.23	2.86	4.34
0.2176-0.3625	1.32	0.00	0.49	0.00
0.3625-1.6700	0.00	0.00	0.20	0.20