2. 6 The diameter of a cylindrical core sample is 2. 5 cm, its length is 6. 0 cm. Under a pressure difference of 0. 3 MPa, oil with which the core sample is 100% saturated flows through the core, the volumetric flow rate of oil is 0.8 cm³/s and the viscosity of oil is 2.5 mPa • s. Calculate the permeability of this rock sample.

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