多孔介质中天然气水合物生成的主要影响因素

发布时间：2018-05-25 23:28

  本文选题：甲烷水合物 + 多孔介质　； 参考：《天然气工业》2017年05期

【摘要】：目前有关天然气水合物(以下简称水合物)的研究主要集中在物理化学性质考察和开采(分解)方法探索方面。在进行后者的研究过程中,地层渗流过程的物理模拟至关重要,但目前借助于石油开采研究中广泛应用的填砂管等多孔介质对水合物进行动态过程的研究却鲜有报道。为此,利用河砂填砂管在岩心驱替装置上进行了甲烷水合物生成过程的物理模拟,考察了地层温度、甲烷压力及地层模型性质参数等对水合物生成过程的影响。结果表明:(1)利用冰融水作为地层模型的束缚水可显著提升甲烷水合物的生成速率;(2)多孔介质条件下过程驱动力(即实验压力或温度偏离水合物相平衡对应值的程度)对甲烷水合物的生成起着决定性作用;(3)当甲烷压力高于水合物相平衡压力1.4倍以上,或者实验温度低于相平衡温度3℃以下时,甲烷水合物生成诱导期几乎不随温压条件的变化而变化;(4)渗透率、含水饱和度、润湿性等参数对实验中甲烷水合物的生成率不构成明显影响。
[Abstract]:At present, the research of natural gas hydrate (hereinafter referred to as hydrate) is mainly focused on the investigation of physical and chemical properties and exploration of exploitation (decomposition) method. The physical simulation of formation percolation process is very important in the research of the latter. However, there are few reports on the dynamic process of hydrate by means of porous media such as sand filling pipe, which is widely used in petroleum exploitation research. In this paper, the formation process of methane hydrate is simulated on the core displacement device with river sand filled sand pipe. The effects of formation temperature, methane pressure and formation model property parameters on the formation process of methane hydrate are investigated. The results show that using ice melt water as the bound water of stratigraphic model can significantly increase the rate of methane hydrate formation in porous media (i.e. the experimental pressure or temperature deviates from the corresponding value of hydrate equilibrium) in porous media. When the methane pressure is more than 1.4 times higher than the gas hydrate phase equilibrium pressure, Or when the experimental temperature is lower than 3 鈩，

本文编号：1935060