Abstract
As recently, deep oil and gas reservoirs have been exploited, so it has been created the need for more basical data about the effect of overburden pressure on physical properties of reservoir rocks in drilling and production problems.
In this study, it has been discussed how varies were occured on the permeabilities of rocks under triaxial compressions.
The samples used were less-permeable rocks (1.2 md and 1.4 md), more permeable one (240 md) and much permeable artificial sand-stone (660 md) in this experiment.
In the results, it has been certain that the permeability essentialy depends on the differential pressure between the confining pressure and internal fluid pressure on less-permeable one.
On the contrary, the effect of the differential pressure were not almost recognized but the slippage effects slightly appeared on every permeable rocks at each fluid pressure.
On the directions of loads, the radial stress more affected than axial one on the permeability.
