0 引言
1 实验
1.1 实验设备
Fig. 1 Triaxial seepage experiment simulation platform for hydrate reservoir: 1-computer control system; 2-data acquisition system; 3-axial pressure sensor; 4-strain gauge; 5-water bath system; 6-axial pressure rod; 7-end cap; 8-rubber film; 9-sample; 10-circulating water system; 11-vacuum pump; 12-seepage inlet pressure control system; 13-reaction chamber pressure control system; 14-confining pressure control system; 15-axial pressure control system; 16-seepage outlet pressure control system; 17-air source; 18-exhaust; 19-barometer图1 水合物储层三轴渗流实验模拟平台:1-计算机控制系统;2-数据采集系统;3-轴向压力传感器;4-应变计;5-水浴系统;6-轴向加压杆;7-端盖;8-橡皮膜;9-样品;10-循环水系统;11-真空泵;12-渗流进口压力控制系统;13-反应室压力控制系统;14-围压控制系统;15-轴压控制系统;16-渗流出口压力控制系统;17-气源;18-排气装置;19-气体流量计 |
1.2 实验材料与步骤
1.3 甲烷水合物饱和度测定
1.4 渗透率测量
Fig. 2 Typical process of sediment seepage test图2 沉积物渗流测试典型过程 |
2 结果与讨论
2.1 粒径和围压对渗透率的影响
Fig. 3 Influence of particle size and confining pressure on sediment permeability图3 粒径和围压对沉积物渗透率影响 |
2.2 渗透压力对渗透率的影响
Fig. 4 The effect of seepage pressure on permeability at 2oC and 20% saturation图4 2℃下,20%饱和度下渗流压力对渗透率的影响 |
2.3 轴压和饱和度对渗透率的影响
Fig. 5 The relationship between sediment permeability and axial pressure图5 不同水合物饱和度沉积物渗透率与轴向压力的关系 |
Fig. 6 Decrease curve of each axial pressure permeability with saturation图6 各轴向压力下渗透率与水合物饱和度的关系 |
2.4 含水合物沉积物渗透率模拟计算
Fig. 7 Comparison of relative permeability measured value and permeability theory model图7 相对渗透率测量值与渗透率理论模型比较 |