Simulation of improving low-frequency electric field heating efficiency in gas hydrate reservoirs through seawater convection

doi:10.7623/syxb202304009

Acta Petrolei Sinica ›› 2023, Vol. 44 ›› Issue (4): 672-683.DOI: 10.7623/syxb202304009

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Simulation of improving low-frequency electric field heating efficiency in gas hydrate reservoirs through seawater convection

Zhao Ermeng^1,2,3,4, Hou Jian^1,2,3, Liu Yongge^1,2,3, Bai Yajie^1,2,3

1. MOE Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum, Shandong Qingdao 266580, China;
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Shandong Qingdao 266237, China;
3. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
4. School of Earth and Space Sciences, Peking University, Beijing 100871, China

Received:2021-10-14 Revised:2022-10-10 Online:2023-04-25 Published:2023-05-05

海水对流增强天然气水合物藏低频电场加热效率模拟

赵二猛^1,2,3,4, 侯健^1,2,3, 刘永革^1,2,3, 白雅洁^1,2,3

1. 中国石油大学(华东)非常规油气开发教育部重点实验室山东青岛 266580;
2. 青岛海洋国家实验室海洋矿产资源评价与探测技术功能实验室山东青岛 266237;
3. 中国石油大学(华东)石油工程学院山东青岛 266580;
4. 北京大学地球与空间科学学院北京 100871

通讯作者: 侯健,男,1972年10月生,2002年获石油大学(华东)油气田开发工程专业博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事提高油气采收率与水合物资源开采方面的教学和科研工作。Email:houjian@upc.edu.cn
作者简介:赵二猛,男,1991年9月生,2022年获中国石油大学(华东)油气田开发工程专业博士学位,现为北京大学博士后,主要从事油气渗流与天然气水合物资源开采方面的研究工作。Email:zhaoermengnepu@163.com
基金资助:
国家自然科学基金杰出青年基金项目(No.51625403)和中国石油重大科技项目(ZD2019-184-002)资助。

Abstract

Abstract: Natural gas hydrate is considered as a clean energy resource with great potential, and more than 90% of hydrates are distributed in deep-sea sediments. Aiming at the current status of hydrate mining technology, the paper proposes a new exploitation method of injecting normal temperature seawater to enhance the heating efficiency of low-frequency electric field in marine hydrate reservoirs, which has multiple advantages such as depressurization, in-situ heat generation by electric field, thermal convection and in-situ seawater extraction. By means of numerical simulation, the paper analyzes the feasibility and production mechanism of the new method for improving the production efficiency of marine hydrate reservoirs, and explores the effects of seawater injection rate and voltage on the production performance. The research results show that, based on the electric field heating, the injection of normal temperature seawater further improves the gas production rate, gas-to-water ratio and energy efficiency ratio, and the stimulation mechanism lies in strengthening the heat transfer efficiency by seawater convection, providing gas flow driving force and enhancing the reservoir electrical conductivity. With the increase of injection rate, the convective heat transfer effect is further enhanced and the peak gas production is improved, but the gas-to-water ratio decreases continuously due to the increase of water production, and the energy efficiency ratio first increases rapidly and then stabilizes. Increasing voltage can significantly improve gas production and gas-to-water ratio, but it also increases the heat consumption in hydrate reservoirs, thus leading to a decreasing energy efficiency ratio. It is suggested that the electric heating system should be optimized based on the comprehensive consideration of gas production and energy efficiency ratio.

Key words: natural gas hydrate, low-frequency electric field heating, seawater injection, thermal convection, depressurization, production efficiency

摘要： 天然气水合物被视为具有巨大潜力的清洁能源资源,90% 以上的水合物分布在深海沉积物中。针对目前水合物开采技术现状,提出了注入常温海水强化海域水合物藏低频电场加热效率的新型开采方法,可发挥降压、电场原位生热、热对流以及海水就地取材等多重优势。通过数值模拟手段,分析了新方法提高海域水合物藏生产效率的可行性及生产机理,探讨了海水注入速率和电压对生产性能的影响。研究结果表明,在电场加热的基础上,注入常温海水进一步提升了产气速率、生产气水比及能效比,增产机理在于海水对流强化传热效率、提供气体流动驱动力以及增强储层导电性。随着注入速率的增加,对流传热效果进一步加强,产气峰值得到提高,但受产水量增加的影响,生产气水比不断减小,能效比先快速增加后趋于稳定。增加电压可显著提高产气量和生产气水比,但也加大了水合物储层内的热耗,导致能效比不断减小,建议在综合考虑气体产量与能效比的基础上对电加热制度进行优化。

关键词: 天然气水合物, 低频电场加热, 海水注入, 热对流, 降压, 生产效率

CLC Number:

TE355.9

Zhao Ermeng, Hou Jian, Liu Yongge, Bai Yajie. Simulation of improving low-frequency electric field heating efficiency in gas hydrate reservoirs through seawater convection[J]. Acta Petrolei Sinica, 2023, 44(4): 672-683.

赵二猛, 侯健, 刘永革, 白雅洁. 海水对流增强天然气水合物藏低频电场加热效率模拟[J]. 石油学报, 2023, 44(4): 672-683.

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Simulation of improving low-frequency electric field heating efficiency in gas hydrate reservoirs through seawater convection

海水对流增强天然气水合物藏低频电场加热效率模拟

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