水合物合成电容特性与降压开采二维实验研究

2D EXPERIMENTAL STUDIES ON HYDRATE SYNTHESIS ELECTRIC CAPACITY CHARACTERISTIC AND PRODUCTION BY DEPRESSURIZING SYSTEM

在天然气水合物二维开采模拟系统基础上,进行了水合物原位生成及分解过程的实验研究,探讨了温度、压力及电容的变化特性;开展了天然气水合物降压开采二维实验研究,得到了二维开采过程中各参数的动态变化规律,并对敏感因素进行了评价。在水合物合成过程中,随水合物饱和度的增加,水量的不断减少,电容量总体减小趋势明显。降压开采表明在二维平面上存在一定的压差与温差,其中温降随与开采井的距离增大而减小。产气过程分为流动阻力控制、分解速率控制以及残余气体采出三个部分,主要受分解速率和流动阻力共同影响。

Variation of pressure,temperature and electric capacity is discussed by the experiment of the synthesis and dissociation of NGH based on the two-dimensional experimental system.Furthermore,the experiment on hydrate production by depressurization is carried out.An understanding about dynamic characteristics of parameters and influencing factors are achieved.In the synthesis experiment,electric capacity becomes lower as water volume decreases because of synthesis of NGH.Pressure and temperature difference can be observed during the production by depressurizing,meanwhile,the degree of temperature decrease is higher as the increase of the producers' spacing.Three parts are observed in the process of production by depressurization,which are controlled by dissociation rate and flow resistance.