Effect of Temperature and Pressure on Effective Stress Coefficient and Permeability Prediction Model in Coal Reservoirs.

According to eq , a binary model of coal permeability under the coupling of temperature and effective stress was established by nonlinear surface fitting with the following results 8 k = 0.09646 + 1.18184 · e ( − σ / 7.07806 ) · e ( − T / 61.42813 ) ⁣ R 2 = 0.96 ( ZJM ) 9 k = 0.03046 + 1.88995 · e ( − σ / 4.40601 ) · e ( − T / 43.40768 ) ⁣ R 2 = 0.99 ( DHB ) 10 k = 0.02451 + 1.70168 · e ( − σ / 1.70631 ) · e ( − T / 69.20882 ) ⁣ R 2 = 0.97 ( CY ) At the same temperature and effective stress conditions, the permeability of the three coal samples exhibited a decreasing trend with an increasing coal rank ( Figure ).

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