Experimental Bedford limestone permeability dependence on confining stress and pore pressure. A comparative study with previous works
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Abstract
The impact of changes in the state of the confining stress and pore pressure on the permeability of a rock is especially important in the exploitation of oil reservoirs, particularly due to the decreases in the reservoir fluid pressure during the extraction of hydrocarbons. Over the years, numerous experimental studies have been conducted with core samples that have shown a wide range of responses. In the present study, this effect was analyzed in Bedford limestone. Two different modes of confinement, hydrostatic and non-hydrostatic, are investigated. The permeability data obtained from the experiments are fitted to commonly used models based on confining stress, core pressure and effective stress. The results indicate that the linear models offer a satisfactory fit in both confinement modes. A relatively high effective stress coefficient of 5.78 is observed in the hydrostatic mode, while an unusual negative value of -1.63 is found in the non-hydrostatic mode. These results were examined in the context of published perme- ability data and fitting models. To facilitate this analysis, complete tables were prepared that integrate the information available from the literature on permeability experiments in sandstones and limestones.
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