Evolution of Hydrate Dissociation by Warm Brine Stimulation Combined Depressurization in the South China Sea
Evolution of Hydrate Dissociation by Warm Brine Stimulation Combined Depressurization in the South China Sea
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DOI：
10.3390/en6105402
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发表时间：
2013-10-01
期刊：
影响因子：
3.2
通讯作者：
Chen, Zhao-Yang
中科院分区：
文献类型：
--
作者：
Feng, Jing-Chun;Li, Gang;Chen, Zhao-Yang
为评价南海水合物藏的产气动态，采用温盐水吞吐与降压相结合的方法进行了数值模拟。双水平井系统被认为是在这项工作中的井结构。为了减少能量输入并提高能量利用率，将温盐水（< 30摄氏度）而不是热盐水（> 50摄氏度）注入储层中进行水合物分解。研究了水合物储层的本征渗透率、注入盐水的矿化度和温度对天然气水合物开采的影响。数值模拟结果表明，整个水合物存款的平均产气速率Q（avg）约为1.23 × 10（5）ST m（3）/天，与商业可行的产气速率具有相同的数量级。注入的盐水可在两口威尔斯井之间的水合物完全解离后直接从上部生产井泵出。因此，热和抑制剂刺激的有效区域是有限的。敏感性分析表明，提高注入盐水的温度和矿化度可以提高水合物的分解速率。渗透率参数研究表明，渗透率越大的储层水合物分解速率越大。
To evaluate the gas production performance of the hydrate accumulations in the South China Sea, a numerical simulation with warm brine stimulation combined depressurization has been conducted. A dual horizontal well system is considered as the well configuration in this work. In order to reduce energy input and improve energy utilization, warm brine (< 30 degrees C) instead of hot brine (> 50 degrees C) is injected into the reservoir for hydrate dissociation. The effect of the intrinsic permeability of the hydrate reservoir, the salinity and the temperature of the injected brine to gas hydrate exploitation have been investigated. The numerical simulation results indicate that the average gas production rate Q(avg) is about 1.23 x 10(5) ST m(3)/day for the entire hydrate deposit, which has the same order of magnitude compared with the commercially viable production rate. The injected brine can be pumped out from the upper production well directly after the hydrate between the two wells is dissociated completely. Thus, the effective region of heat and inhibitor stimulation is limited. The sensitivity analyses indicate that the dissociation rate of hydrate can be enhanced by increasing the temperature of the injected brine and raising the salinity of the injected brine. The parametric study of permeability shows that the hydrate of the reservoir with the larger permeability has a higher dissociation rate.