Numerical simulation of gas production from hydrate deposits using a single vertical well by depressurization in the Qilian Mountain permafrost, Qinghai-Tibet Plateau, China
Numerical simulation of gas production from hydrate deposits using a single vertical well by depressurization in the Qilian Mountain permafrost, Qinghai-Tibet Plateau, China
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青藏高原祁连山多年冻土区水合物矿床单直井降压产气数值模拟
DOI：
10.1016/j.energy.2013.01.066
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发表时间：
2013-04
期刊：
影响因子：
9
通讯作者：
Li, Yanghui
中科院分区：
文献类型：
--
作者：
Zhao, Jiafei;Yu, Tao;Song, Yongchen;Liu, Di;Liu, Weiguo;Liu, Yu;Yang, Mingjun;Ruan, Xuke;Li, Yanghui
该地区有望成为中国天然气水合物的战略开发区。根据该区域DK-3钻井现场的天然气水合物特征，采用Tough + hydrate软件对单口直井进行降压天然气水合物气藏的产气潜力进行了数值模拟。模拟结果表明，当井筒压力为1.5 MPa时，水合物解离平均ch4产率约为188 ST m3/d，储层平均总ch4产率约为539 ST m3/d，累计ch4产量比井筒压力为1 MPa和2.5 MPa时分别高出约35%和39%。在此基础上，数值模拟了井筒压力为1.5 MPa时储层温度、水合物饱和度和含气饱和度的空间分布演化；模拟结果表明，储层中存在大量的游离ch4。在解离时间内，储层中天然气水合物解离有效半径小于20 m，实际解离的天然气水合物仅占模拟体系中天然气水合物总量的2.3%。结果表明，单口直井降压法并不是祁连山多年冻土区天然气水合物开发的最佳方法。其他生产策略，如水平井设计或降压和热增产的结合，可能在经济上更可行。
In November 2008, gas hydrate samples were recovered during the scientific gas hydrate drilling project conducted in the Qilian Mountain permafrost located in the Qinghai-Tibet Plateau, China. This region is expected to become a strategic gas hydrate exploitation area in China. Based on the gas hydrate characteristics at the DK-3 drilling site located in this region, we used using Tough + Hydrate to numerically simulate the gas production potential of the gas hydrate deposits using a single vertical well by depressurization. The simulation results indicated that for a 1.5 MPa wellbore pressure, the average CH4production rate of hydrate dissociation was approximately 188 ST m3/d, the reservoir average total CH4production rate was approximately 539 ST m3/d, and the cumulative CH4volume produced from the reservoir was approximately 35% and 39% larger than those for wellbore pressures of 1 MPa and 2.5 MPa. Moreover, we numerically simulated the spatial distribution evolution of temperature, hydrate saturation and gas saturation in the reservoir for a 1.5 MPa wellbore pressure; the simulation indicated that a large volume of free CH4remained in the reservoir. During the dissociation time, the gas hydrate dissociation effective radius in the reservoir was less than 20 m, and the actual dissociated gas hydrates only accounted for 2.3% of the total gas hydrates in the simulated system. The results may suggest that the single vertical well by depressurization method is not optimal for the development of gas hydrate deposits in the Qilian Mountain permafrost. Other production strategies, such as a horizontal well design or the combination of depressurization and thermal stimulation, may be more economically feasible.
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DOI：
--
发表时间：
2010-08
期刊：
--
影响因子：
--
作者：
Gang Li;Xiaosen Li;Liang-Guang Tang
通讯作者：
Gang Li;Xiaosen Li;Liang-Guang Tang
使用气泡法和一套可视化设备从 IGCC（整体气化联合循环）合成气中捕集水合物 CO2（二氧化碳）
影响因子：
9
作者：
Xu, Chun-Gang;Li, Xiao-Sen;Lv, Qiu-Nan;Chen, Zhao-Yang;Cai, Jing
通讯作者：
Cai, Jing
DOI：
10.2172/927149
发表时间：
2008-03
期刊：
Lawrence Berkeley National Laboratory
影响因子：
--
作者：
G. Moridis;M. Kowalsky;K. Pruess
通讯作者：
G. Moridis;M. Kowalsky;K. Pruess
影响因子：
--
作者：
Zhang Yong-qin
通讯作者：
Zhang Yong-qin
影响因子：
3.2
作者：
Feng, Jing-Chun;Li, Gang;Chen, Zhao-Yang
通讯作者：
Chen, Zhao-Yang