页岩在水溶液中膨胀规律的实验研究

Experimental Study on Shale Swelling in Various Solutions

采用 Arco页岩和 Tournemire页岩在不同活度的水溶液中进行实验 ,定量分析水溶液活度对页岩膨胀的影响 ,同时还研究了页岩沉积面 (层面 )的方位和水溶液体积对页岩膨胀的影响。实验结果表明 ,水溶液的活度对页岩膨胀程度的影响较大 ,水溶液的体积对页岩膨胀程度的影响很小 ,页岩沉积面方位对页岩膨胀程度影响较大 ,与页岩沉积面其它方位相比 ,沿垂直于沉积面方位的膨胀量最大 ,稳定性最差。

Shale will swell in various solutions. What are the factors which affect shale swelling? How do those factors affect shale swelling? This paper will give some answers to the problems according to experiments with Arco Shale and Tournemire Shale. Experimental results show that Water activity (Aw) is the most important factor which affects shale swelling. The volume of solutions has little effect on shale swelling for a given Aw. The Aw of solutions has a great effect on shale swelling. When the Aw of solution is less than that of shale, the shale will shrink during the first period of time. Then, shale will continue to swell. The orientation of the shale bedding is much greater than that parallel to shale bedding. And well instability will be more possible in the direction perpendicular to shale bedding.