Depressurizing dissociation of natural gas hydrate with different saturation

LI Shuxia; LI Jie; JIN Yurong

doi:10.3969/j.issn.0438-1157.2014.04.035

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Depressurizing dissociation of natural gas hydrate with different saturation

更新时间：2025-12-10

- Depressurizing dissociation of natural gas hydrate with different saturation
- CIESC Journal Issue 4, Pages: 1411-1415(2014)
- 作者机构：
  
  1. 中国石油大学（华东）石油工程学院,山东,青岛,266580
  2. 中海石油（中国）有限公司深圳分公司研究院,广东,广州,510240
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.04.035
  CLC： E37
- Online First：26 November 2013，
  
  Published：26 November 2013
- 稿件说明：
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LI Shuxia, LI Jie, JIN Yurong. Depressurizing dissociation of natural gas hydrate with different saturation[J]. CIESC Journal, 2014, (4): 1411-1415.
DOI：

LI Shuxia, LI Jie, JIN Yurong. Depressurizing dissociation of natural gas hydrate with different saturation[J]. CIESC Journal, 2014, (4): 1411-1415. DOI： 10.3969/j.issn.0438-1157.2014.04.035.

摘要

天然气水合物作为一种新能源已得到世界各国的关注，降压是水合物藏的一种有效开采方式。采用自制的天然气水合物开采模拟实验装置，在多孔介质中生成不同饱和度的天然气水合物，之后进行缓慢降压开采实验。结果表明：降压开采可分为自由气产出、水合物降压分解产气和最后降压产出已分解气三个阶段。在降压分解阶段，当水合物饱和度从16%增加到48%时，平均产气速率先增加后减小，说明水合物饱和度对降压分解产气速率的影响是非线性的。降压分解时，水合物饱和度越大，温度下降幅度越大。实验研究范围内，中等饱和度（32%）的水合物藏降压分解产气速率比较大，降压开采效果较好。

Abstract

Natural gas hydrate (NGH)

a high quality

clean and efficient new energy

has received worldwide attention. Among the NGH dissociation methods

depressurization has been considered as an effective way. However

the result of depressurization dissociation is different for NGH with different saturations. A home-made one-dimensional experimental system is used for studying formation and dissociation behavior of NGH. At simulation marine geological conditions

NGH with different saturations is formed in the simulated porous media. Then they are dissociated by depressurizing slowly. Dissociation performance and saturation influence of NGH are analyzed. The results show that: the NGH dissociation by depressurization can be divided into three stages: free gas production in the early stage

gas release from hydrate dissociation in the second stage and surplus free gas release in the third stage. In the second stage

with NGH saturation increasing from 16% to 48%

the average rate of gas production increases first and then decreases. It shows that the effect of NGH saturation on gas production rate by NGH dissociation is of non-linear relation. Higher NGH saturation results in a large range of temperature decrease. Within the range of our experimental conditions

the dissociation rate of NGH with medium saturation (32%) is relatively larger

so depressurization is a appropriate method for NGH reservoirs with medium saturation.

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