Research progress and scientific challenges in the depressurization exploitation mechanism of clayey-silt natural gas hydrates in the northern South China Sea

IF 9 1区 地球科学 Q1 ENERGY & FUELS Advances in Geo-Energy Research Pub Date : 2023-09-22 DOI:10.46690/ager.2023.10.03
Cheng Lu, Xuwen Qin, Jinsheng Sun, Ren Wang, Jianchao Cai
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引用次数: 1

Abstract

Natural gas hydrate reservoirs in the northern South China Sea primarily comprise clayey silt, making exploitation more challenging relative to sandy reservoirs in other countries and regions. This paper provides an overview of the latest research developments in the exploitation mechanism covering the past five years, focusing on hydrate phase transition, multiphase flow in the decomposition zone, the seepage regulation of reservoir stimulation zone, and production capacity simulation, all of which are relevant to the previously conducted two rounds of hydrate trial production in offshore areas of China. The results indicate that the phase transition of clayey-silt hydrate remains in a dynamic equilibrium, with the decomposition efficiency mainly controlled by the coupling of heat and flow and high heat consumption during decomposition. The decomposition zone exhibits strong hydrophilicity, easy adsorption, and sudden permeability changes. A temperature drop is present that is concentrated near the wellbore, and once a water lock has formed, the gas-phase flow capacity significantly decreases, leading to potential secondary hydrate formation. To enhance permeability and increase production, it is imperative to implement reservoir and temperature field reconstruction based on initial formation alterations, which will further optimize and improve the transport capacity of the reservoir. Document Type: Current minireview Cited as: Lu, C., Qin, X., Sun, J., Wang, R., Cai, J. Research progress and scientific challenges in the depressurization exploitation mechanism of clayey-silt natural gas hydrates in the northern South China Sea. Advances in Geo-Energy Research, 2023, 10(1): 14-20. https://doi.org/10.46690/ager.2023.10.03
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南海北部泥质-淤泥质天然气水合物降压开采机制研究进展与科学挑战
南海北部天然气水合物储层主要由粘土质粉砂质组成,相对于其他国家和地区的砂质储层,开发难度较大。本文综述了近5年来在水合物相变、分解带多相流、储层增产带渗流调节、产能模拟等开发机理方面的最新研究进展,这些都与中国海上已进行的两轮水合物试采有关。结果表明:黏性粉土水合物相变处于动态平衡状态,分解效率主要受热流耦合和分解过程中高热量消耗的控制。分解带亲水性强,易吸附,渗透率变化突然。温度下降集中在井筒附近,一旦形成水锁,气相流动能力显著降低,导致潜在的二次水合物形成。为了提高储层渗透率和产量,基于地层初始蚀变进行储层和温度场重建势在必行,这将进一步优化和提高储层的输送能力。引用全文:陆超,秦翔,孙军,王荣,蔡军。南海北部泥质-淤泥质天然气水合物降压开采机制研究进展与科学挑战。地球能源研究进展,2023,10(1):14-20。https://doi.org/10.46690/ager.2023.10.03
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来源期刊
Advances in Geo-Energy Research
Advances in Geo-Energy Research natural geo-energy (oil, gas, coal geothermal, and gas hydrate)-Geotechnical Engineering and Engineering Geology
CiteScore
12.30
自引率
8.50%
发文量
63
审稿时长
2~3 weeks
期刊介绍: Advances in Geo-Energy Research is an interdisciplinary and international periodical committed to fostering interaction and multidisciplinary collaboration among scientific communities worldwide, spanning both industry and academia. Our journal serves as a platform for researchers actively engaged in the diverse fields of geo-energy systems, providing an academic medium for the exchange of knowledge and ideas. Join us in advancing the frontiers of geo-energy research through collaboration and shared expertise.
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