By inducing a gas (non-wetting fluid) into a water saturated rock, the gas will displace the water (wetting fluid), but this process just take place, when the capillary pressure is above the capillary entry pressure (gas pressure difference). First the largest pores near the sample surface are drained (drainage process). At higher capillary pressures even the smallest pores are filled with gasThe relation between capillary pressure and pore radius is given by the Washburn equation (1921), “The intrusion of a non-wetting fluid into a cylindrical capillary of radius r only occurs if the capillary pressure Pc […] within a pore is exceeded”: [...]
Table Of Contents
I. Introduction: Principle Measurement
II. Results steady state experiment
II. 1. Steady-State single-phase gas permeability on a dry sample
II. 2. Steady-State gas permeability on a saturated sample
II. 3. Non-steady state single-phase flow on a saturated sample
III. Error calculation
IV. Conclusion
V. References
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