Methane adsorption on shale under high temperature and high pressure of reservoir condition: Experiments and supercritical adsorption modeling
Methane adsorption on shale under high temperature and high pressure of reservoir condition: Experiments and supercritical adsorption modeling
复制标题
DOI：
10.1177/0263617415623425
复制
发表时间：
2016-03
影响因子：
2.9
通讯作者：
W. Xiong;Luo Zuo;Litao Luo;Zhiming Hu;Y. Cui
中科院分区：
文献类型：
--
作者：
W. Xiong;Luo Zuo;Litao Luo;Zhiming Hu;Y. Cui
为了了解页岩在高压下的甲烷吸附特性，在95.6 ℃、75.6 ℃和40.6 ℃下进行了高达50 MPa的干页岩对甲烷的吸附实验。结果表明，页岩在高压和低压下的过量吸附量是不同的。吸附量随着压力的增加而增加，直到达到峰值，然后随着压力的进一步增加而下降。研究了吸附等温线来解释过量吸附行为。此外，在超临界吸附的基础上建立了一个新的超临界吸附模型。用该模型和Langmuir模型对吸附等温线进行了拟合。Langmuir模型仅在低压下与实验数据吻合较好，而在高压下则不符合。新模型能较好地拟合页岩对甲烷的吸附等温线，反映了高温高压下页岩对甲烷的吸附特性。
To understand methane adsorption characteristics on shale at high pressures, we conducted experiments of methane adsorption on dry shale up to 50 MPa and at 95.6 ℃, 75.6 ℃, and 40.6 ℃. Results show that the amount of excess adsorption on shale at high pressures is not the same as that at low pressures. The amount of adsorption increases with pressure until a peak value is reached and then declines with further pressure increases. Isosteric heat of adsorption is studied to explain the excess adsorption behavior. In addition, a new supercritical adsorption model was developed based on supercritical adsorption. This new model and Langmuir model were both used to fit the adsorption isotherms data. Langmuir model matched well with experiment data only at low pressures but failed at high pressures. The new model can fit the adsorption isotherms well, indicating that it reflects the characteristics of supercritical methane adsorption on shale at high pressure and temperature.