渗漏型甲烷水合物的生成实验

天然气水合物是未来潜在的清洁能源,与扩散型水合物相比,渗漏型水合物具有埋藏浅储量大的特点,因此,具有更大的开采和利用价值。在自制的7.5 L透明高压反应釜中模拟研究了沉积物中渗漏型甲烷水合物的生成过程,考察了水合物生成过程中温度、压力、电阻率以及流量的变化;计算了甲烷水合物的生成速率;并对水合物生成过程进行了可视化研究。实验结果表明,渗漏型甲烷水合物可快速生成,在初始温度3.5 ℃、初始压力6.2 MPa、渗漏通量14.7 mol/(m2·s)的条件下,水合物最大生成速率为0.12 mol/s,电阻率最大可以达到2.2 Ω·m。

EXPERIMENTAL STUDY OF LEAKAGE-TYPE METHANE HYDRATE FORMATION

Natural gas hydrate is regarded as a kind of potential clean energy for the future. Compared with the diffusion-type hydrate, the scale of leakage type hydrate is larger and therefore more valuable for mining and using. This experiment simulates the generation process of leakage-type methane hydrate in a reaction cylinder designed by the authors (the volume is 7.5 L). We investigated the variations of the temperature pressure resistivity and flow rate during the hydrate formation, and then calculated the rate of methane hydrate formation. We also take photos to monitor the generation process for visual research on the hydrate generation. It indicates that the leakage type methane hydrate forms quickly under the initial condition of 3.5 ℃, 6.2 MPa and flux of leakage of 14.7 mol/ (m2·s). The maximum of the generation rate reached to 0.12 mol/s; and the resistivity peaked at 2.2 Ω·m.