Study on Gas Adsorption-Desorption and Diffusion Behaviour in Coal Pores Modified by Nano Fracturing Fluid.

From Figure 3 and Table 2 , it can be seen that the methane desorption amounts of the three different coal rank coal samples treated with normal clean fracturing fluid and nanofracturing fluid showed an increasing trend with pressure, the reason for the large variation of desorption at 0.4–0.6 MPa for four coals with different nanoparticle contents in the desorption diagram of low-rank coal is that there is a competitive adsorption relationship between nanoparticles and fracturing fluid, and breaking the critical value in this interval causes an increase in the rate of change of desorption.

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The excess adsorption reached the maximum value at 6 MPa, and the excess adsorption of the 1, 2, 4, and 10 nm coal slit pore models showed a decreasing trend when the pressure continued to increase in the pressure interval from 6 to 10 MPa.

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