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Assessment of Gas Production from Complex Hydrate System in Qiongdongnan Basin of South China Sea

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  • Lu Yu

    (Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
    National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou 511458, China)

  • Hongfeng Lu

    (Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
    National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou 511458, China)

  • Liang Zhang

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Chenlu Xu

    (Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
    National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou 511458, China)

  • Zenggui Kuang

    (Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
    National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou 511458, China)

  • Xian Li

    (Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
    National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou 511458, China)

  • Han Yu

    (Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
    National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou 511458, China)

  • Yejia Wang

    (Guangdong Center of Marine Development Planning Research, Guangzhou 510220, China)

Abstract

The China Geological Survey (CGS) has carried out a large number of surveys and core drilling over the deepwater area of Qiongdongnan Basin (QDNB) in the South China Sea and discovered the natural gas hydrate system controlled by the gas chimney with a high geothermal gradient. The complex hydrate system consists of a sandy hydrate reservoir distributed around a lateral transition gas-hydrate mixed zone and a free gas zone in the middle. The hydrate and gas are distributed in the same layer, which is thin but potentially valuable for commercial exploitation. In this paper, a geological model of the target hydrate system in QDNB was established based on the results of several rounds of drilling. The method of numerical simulation was utilized to assess the production capacity of the target hydrate system and clarify the evolution of hydrate and gas saturation distribution with different well positions. The simulation results indicate that the producer well built in the center of the highly-saturated hydrate zone has a limited gas production capacity, with a cumulative production of only 7.25 × 10 6 m 3 in 9 years. The well built at the boundary of the hydrate zone can rapidly link up the gas in the transition zone through a large production pressure differential, but it lacks control over the hydrates and its dissociated gas in the transition zone—the cumulative gas production volume from hydrate accounts for only 12.3%. As for the wells built in the transition zone and gas zone, they can directly invoke the free gas production capacity. Free gas is produced as the formation pressure reduces and hydrate is induced to dissociate, making the gas from the hydrate the subsequent production capacity. The cumulative production can exceed 6 × 10 8 m 3 in 9 years. The stable production duration can extend to 2645 days, and the cumulative proportion of gas at the wellhead from hydrate reaches close to 30%. It is necessary to avoid the free water layer. The bottom water coning would improve the water production by 40% and shorten the stable production duration. In summary, the complex hydrate system of this type in the QDNB has the potential for industrialized exploitation. In the future, the well group can be used for the further improvement of the hydrate utilization rate.

Suggested Citation

  • Lu Yu & Hongfeng Lu & Liang Zhang & Chenlu Xu & Zenggui Kuang & Xian Li & Han Yu & Yejia Wang, 2023. "Assessment of Gas Production from Complex Hydrate System in Qiongdongnan Basin of South China Sea," Energies, MDPI, vol. 16(21), pages 1-25, November.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:21:p:7447-:d:1274257
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    References listed on IDEAS

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