三维中试装置内水合物降压分解动力学规律

doi:10.16085/j.issn.1000-6613.2021-2010

摘要/Abstract

摘要：

利用196L三维装置研究了含下伏气层水合物藏的降压分解规律。对比研究了单竖直井实验和竖直井-水平井双井开采的实验，实验结果表明，过大的降压幅度可能会导致开采井被雾沫夹带的水堵塞，对于含下伏气层的水合物藏，反应釜底部和近井区域由于局部气流速度过快导致更严重的温降。建立了经典格式的分解动力学模型，结果表明，对于三维装置，单独利用推动力和分解速率并不能准确反映水合物实际分解状况。利用水合物剩余分解比例校正后，推动力和分解速率呈线性关系，单井实验所拟合参数k=0.284mol/(min·MPa)与双井降压实验 k=0.279mol/(min·MPa)可以互相验证。

关键词: 水合物, 降压开采, 分解动力学, 中试装置

Abstract:

A pilot-scale reactor with a volume of 196L was adopted to examine the decomposition behavior of hydrate reservoir which contains a bottom gas-rich zone. Exploitation experiments with a single vertical well, and with double well (vertical and horizontal well) were conducted. Results showed that an excessive pressure drop might result in well blocking by the ice which was resulted from foam entrainment. For reservoir with a bottom gas-rich zone, the areas closer to the well and the bottom of the reactor had a greater temperature drop, compared to other areas of the reactor owing to the faster local gas flow rate. The classical decomposition dynamics model was established. Results showed that for the large three-dimensional device, the driving force and decomposition rate could not reflect the actual hydrate decomposition behavior accurately. However, after the driving force was corrected through the residual ration of hydrate, the driving force had a linear relationship with the decomposition rate, and fitting parameters of single well experiment that k=0.284mol/(min·MPa) and double well experiment that k=0.279mol/(min·MPa) can be mutually verified.

Key words: hydrate, exploitation, decomposition dynamics, pilot-scale device

中图分类号:

王云飞, 孙长宇, 喻西崇, 李清平, 陈光进. 三维中试装置内水合物降压分解动力学规律[J]. 化工进展, 2022, 41(8): 4111-4119.

WANG Yunfei, SUN Changyu, YU Xichong, LI Qingping, CHEN Guangjin. Analysis of the methane hydrate decomposition kinetics through depressurization method by using a pilot-scale reactor[J]. Chemical Industry and Engineering Progress, 2022, 41(8): 4111-4119.

图/表 8

图1 实验装置图和实验流程图1—甲烷/氮气气瓶；2—减压阀；3—真空泵；4—反应釜；5—竖直井；6—水平井；7—气液分离罐；8—天平；9—过滤器；10—背压阀；11—收集气瓶；12—数据采集系统

表1 两组实验的实验参数

实验	开采井数目	开采前压力/MPa	开采前温度/K	水合物饱和度/%	水饱和度/%	气饱和度/%	开采压力/MPa	产气量/mol	产水量/g
Run 1	1	12.02	284.22	18.82	16.05	65.13	7.5	315.20	0
Run 2	2	11.63	284.55	16.60	22.19	63.21	5.5	344.44	0

图2 单井降压（Run 1）和双井降压（Run 2）开采过程中反应釜内温度分布

图3 单井和双井降压开采过程产气比和水合物分解比对比RP1，RH1，RP2，RH2—单井降压开采过程中的产气比、水合物分解比、双井降压开采过程中的产气比、水合物分解比

图4 单井降压开采过程中水合物分解速率和推动力随时间变化曲线

图5 单井降压开采过程中水合物分解速率和有效推动力随时间变化曲线

图6 单井降压开采过程中水合物分解速率与有效推动力拟合曲线

图7 双井降压开采过程中水合物分解速率与有效推动力拟合曲线

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