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[1]张智,赵苑瑾,蔡楠,等.天然气水合物分解诱发超孔隙压力预测方法*[J].中国安全生产科学技术,2024,20(11):30-36.[doi:10.11731/j.issn.1673-193x.2024.11.004]
　ZHANG Zhi,ZHAO Yuanjin,CAI Nan,et al.Prediction method of excess pore pressure induced by natural gas hydrate decomposition[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2024,20(11):30-36.[doi:10.11731/j.issn.1673-193x.2024.11.004]
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天然气水合物分解诱发超孔隙压力预测方法*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
20
期数:
2024年11期
页码:
30-36
栏目:
学术论著
出版日期:
2024-11-30

文章信息/Info

Title:
Prediction method of excess pore pressure induced by natural gas hydrate decomposition
文章编号:
1673-193X(2024)-11-0030-07
作者:
张智; 赵苑瑾; 蔡楠; 向世林; 敬耘博; 徐茂洋
（西南石油大学 油气藏地质及开发工程国家重点实验室，四川 成都 610500)
Author(s):
ZHANG Zhi;  ZHAO Yuanjin;  CAI Nan;  XIANG Shilin;  JING Yunbo;  XU Maoyang
(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu Sichuan 610500,China)
关键词:
天然气水合物; 超孔隙压力; 水合物开发; 因素分析
Keywords:
natural gas hydrate;  excess pore pressure;  hydrate development;  factor analysis
分类号:
X937;TE5
DOI:
10.11731/j.issn.1673-193x.2024.11.004
文献标志码:
A
摘要:
为避免深水井生产过程中，天然气水合物分解诱发的超孔隙压力引起海底滑坡、井筒完整性失效等问题，综合考虑生产阶段水合物分解过程中沉积物压缩性变化及流体密度改变情况，结合质量守恒原理，建立水合物分解引起的沉积物总体积膨胀模型，得到针对天然气水合物分解诱导的超孔隙压力计算方法，并以南海某含天然气水合物地层的深水井为例，讨论不同因素对水合物分解诱发超孔隙压力的影响。研究结果表明：超孔隙压力随水合物初始饱和度、沉积物孔隙率的增加而升高，而且由于超孔隙压力的升高会抑制水合物的进一步分解，其增幅随之减小，存在最大值；此外，超孔隙压力随天然气水合物埋深的增加而增大，但受水深影响较小。研究结果可为深水井安全生产提供理论参考。
Abstract:
In order to avoid the problems such as submarine landslide and wellbore integrity failure caused by the excess pore pressure induced by the decomposition of natural gas hydrate during the production process of deep-water wells,the change of sediment compressibility and fluid density during the hydrate decomposition process in the production stage was comprehensively considered,and a model for the total volume expansion of sediment caused by hydrate decomposition was established combining with the principle of mass conservation.A calculation method of the excess pore pressure induced by the decomposition of natural gas hydrate was obtained,and the influence of different factors on the excess pore pressure induced by hydrate decomposition was discussed by taking a deep-water well in a gas hydrate bearing formation in the South China Sea as an example.The result show that the excess pore pressure increases with the increase of initial hydrate saturation and sediment porosity,and the increase of excess pore pressure will inhibit the further decomposition of hydrate,so its increase amplitude decreases and has a maximum value.In addition,the excess pore pressure will increase with the increase of the buried depth of natural gas hydrate,but is less affected by the water depth.The research results can provide a theoretical basis for the safe production of deep-water wells.

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备注/Memo

备注/Memo:
收稿日期： 2023-04-18
* 基金项目： 国家自然科学基金区域联合基金重点项目(U22A20164);国家自然科学基金面上项目(52074234);油气藏地质及开发工程国家重点实验室2019年开放基金项目（PLN201925）;中国石油-西南石油大学创新联合体科技合作项目(2020CX040100)
作者简介： 张智，博士，教授，主要研究方向为油气井、油气田开发与海洋油气工程、能源与人工智能。
更新日期/Last Update: 2024-11-28