天然气水合物相平衡的实验研究

天然气水合物相平衡研究是天然气水合物勘探开发和海洋环境保护研究的基础,也是最重要的前缘问题。为此,对取自中国西部油田某2口井的分离器气气样1和气样2在纯水、地层水和配置水等3种水样,以及3 MPa、6 MPa、9 MPa、12 MPa等4个压力体系下对生成水合物的温度进行了实验研究。研究结果表明：随着实验压力的增加,同种气样生成天然气水合物的温度越高;随着水样矿化度的增加,同种气样生成天然气水合物的温度越低;在同一水样中,组分、组成不同的天然气,甲烷含量越高,其形成天然气水合物的温度越低。

THE EXPERIMENTAL RESEARCHES ON PHASE EQUILIBRIUM OF NATURAL GAS HYDRATES

Natural gas hydrate is widely acknowledged as a kind of environment friendly energy, meanwhile, it has significant strategic position in world energy structure. Natural gas hydrates phase equilibrium research works are the basis for protecting and researching natural gas hydrate reserves. Thus, natural gas sample Ⅰ and gas sample Ⅱ are taken from two wells located in West China for further experiment. Under the fixed pressures respectively about 3, 6, 9 and 12 Mpa, temperatures at which hydrates are formed are measured in pure water, formation water and mixed water. The research findings show that the higher pressure is, the higher formed temperature of the same gas sample will be; and the higher salinity of the fluid sample is, the lower formed temperature of the same gas sample will be; and the formed temperature will be lower if methane content of natural gas is higher. (Financed by CNPC Innovation Fund, No. 04E7047, Teaching and Research Award Program for Outstanding Young Teachers in Higher Education TROAPY, Research Fund for the Doctoral Program of Higher Education, No. 2004615004, and Academic and Technical Leader Fund of Sichuan Province, No. 2200320)