Comparison of the Permeabilities of Shirahama Sandstone Specimens Jacketed with Different Methods.

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  • 異なる方法で被覆した白浜砂岩供試体の透水係数測定結果の比較
  • コトナル ホウホウ デ ヒフク シタ シラハマ サガン キョウシタイ ノ トウスイ ケイスウ ソクテイ ケッカ ノ ヒカク

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Abstract

It is clear that the permeability of a hydraulically tight rock can be measured accurately only when the side clearance flow between the specimen surface and the jacket material is completely prevented. To verify the effect of jacketing method on permeability measurement, specimens of Shirahama sandstone covered with three different methods were tested by means of the transient pulse technique. The results showed that when a specimen is jacketed with the shrinkable tube only, the side clearance flow may occur and cause overestimation of the permeability. This clearance flow, however, can be prevented by spreading a layer of low-viscosity silicone rubber on the side surfaces of the specimen and end pieces before covering the shrinkable tube.<BR>The equivalent cylindrical capillary radii of the pathway of the side clearance flow under the tested conditions were then quantitatively evaluated. The results illustrated that even when a equivalent cylindrical capillary radius is thin as 0.01mm, its influence on the permeability measurements can be notable. In addition, transmission of the confining pressure from the pressure medium in the vessel to rock specimen was discussed by the theory of elasticity which support that if the young's modulus of a rock specimen is equal to or larger than that of the jacket material, the pressure in the vessel can be fully transmitted to the rock specimen through the jacket material.

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