Mechanism of Effect of Relative Humidity on Creep Behavior of Gypsum Rock
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摘要: 为了弄清盐膏岩在井下环境下的蠕变规律,对盐膏岩蠕变规律影响机理进行了研究。采用调节盐溶液中含盐量的方法来控制岩样周围环境的相对湿度值,并在相对湿度为35%,65%,95%的条件下,进行围压分别为0,2,5 MPa的三轴短期压缩试验和单轴应力为10 MPa的蠕变试验。相对湿度从35%增加到95%,盐膏岩岩样强度由38.2 MPa降至35.2 MPa;弹性模量和泊松比变化量小。相对湿度为95%时,盐膏岩岩样产生负向的体积应变(膨胀);相对湿度为35%时,盐膏岩岩样产生正向体积应变(收缩)。研究结果表明,盐膏岩的强度对于相对湿度的变化不很敏感;结合Heard模型,利用蠕变激活能可以解释相对湿度对体应变速率的影响;晶体到毛细管空间的水分子相互运移的机械化学机制,可以解释相对湿度对体应变的影响。研究得到盐膏岩井下真实的蠕变规律,为盐膏层安全钻井提供了理论依据。Abstract: In order to find out the creep behavior of salt-gypsum under the down hole conditions,the mechanism affecting salt-gypsum creep was studied.By adjusting the concentration of salt in the salt solution to control the relative humidity around the rock samples,the uni-axial compression test was carried out at 10 MPa and tri-axial compression tests were carried out at confining pressures of 0,2 and 5 MPa under relative humidity of 35%,65% and 95% respectively.It was found that in a short-term test of salt-gypsum rock,the rock strength displays a downward trend from 38.2 MPa to 35.2 MPa with the increase of relative humidity from 30% to 90%,the change in Young’s modulus and Poisson’s ratio is small.When the relative humidity is 95%,the sample generates negative volumetric strain (expansion) and when the relative humidity is 35%,the sample generates positive volumetric strain (shrinkage).The study shows the strength of salt-gypsum is not highly sensitive to the change of relative humidity;and combined with the Heard model,the impact of relative humidity on the volumetric strain rate can be explained by the theory of creep activation energy;and the influence of relative humidity on the volumetric strain can be explained by the mechanical-chemical mechanisms of mutual migration of water molecules between the crystal and capillary spaces.The creep behavior of salt-gypsum rock underground revealed by the study can provide theoretical basis for safe drilling in this kind of formations.
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