首页|Evaluation of the Shallow Gas Hydrate Production Based on the Radial Drilling-Heat Injection-Back Fill Method

Evaluation of the Shallow Gas Hydrate Production Based on the Radial Drilling-Heat Injection-Back Fill Method

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It has been evidenced that shallow gas hydrate resources are abundant in deep oceans worldwide.Their geological back-ground,occurrence,and other characteristics differ significantly from deep-seated hydrates.Because of the high risk of well construction and low production efficiency,they are difficult to be recovered by using conventional oil production methods.As a result,this paper proposes an alternative design based on a combination of radial drilling,heat injection,and backfilling methods.Multi-branch holes are used to penetrate shallow gas hydrate reservoirs to expand the depressurization area,and heat injection is utilized as a supplement to improve gas production.Geotechnical information collected from an investigation site close to the offshore production well in the South China Sea is used to assess the essential components of this plan,including well construction stability and gas production behavior.It demonstrates that the hydraulic fracturing of the 60 mbsf overburden layer can be prevented by regulating the drilling fluid densities.However,the traditional well structure is unstable,and the suction anchor is advised for better mechanical performance.The gas produc-tion rate can be significantly increased by combining hot water injection and depressurization methods.Additionally,the suitable produc-tion equipment already in use is discussed.

shallow gas hydratetrail productionradial drilling-heat injection-back fill methodexperimental and numerical simulation

CHEN Qiang、WAN Yizhao、WU Nengyou、SUN Jianye、WANG Jian、LIU Changling、LI Yanlong、LI Chengfeng、HU Gaowei

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Key Laboratory of Gas Hydrate,Ministry of Natural Resources,Qingdao 266071,China

Laboratory for Marine Mineral Resources,Laoshan Laboratory,Qingdao 266071,China

Technology Innovation Center for Marine Methane Monitoring,Ministry of Natural Resources,Qingdao 266071,China

CNPC Offshore Engineering Company Limited,Beijing 100028,China

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Natural science Foundation of Shandong ProvinceNational Natural Science Foundation of ChinaMarine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology(Qingdao)China Geological Survey Program

ZR2020110 30013419762052021QNLM020002DD20221704

2024

10.1007/s11802-023-5380-4

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(1)
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