Pore Structure and Limit Pressure of Gas Slippage Effect in Tight Sandstone

Table 3

The influence of backpressure on gas slip factor for sample SS-2.

Backpressure (MPa)	Relationships between 1/𝑝𝑚 and 𝐾𝑎 for sample SS-2	𝑏
0.1	𝑦=0.0072𝑥+0.0232=0.0232(1+0.3103𝑥)	0.3103
0.3	𝑦=0.0068𝑥+0.023=0.023(1+0.2957𝑥)	0.2957
0.5	𝑦=0.0061𝑥+0.0206=0.0206(1+0.2961𝑥)	0.2961
0.7	𝑦=0.0052𝑥+0.0205=0.0205(1+0.2537𝑥)	0.2537
0.9	𝑦=0.0002𝑥+0.0231=0.0231(1+0.0086𝑥)	0.0086
1	𝑦=0.0001𝑥+0.0227=0.0227(1+0.0044𝑥)	0.0044