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Numerical Evaluation of a Novel Development Mode for Challenging Oceanic Gas Hydrates Considering Methane Leakage

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  • Shuaishuai Nie

    (College of Construction Engineering, Jilin University, Changchun 130026, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Natural Resources, Changchun 130026, China)

  • Chen Chen

    (College of Construction Engineering, Jilin University, Changchun 130026, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Natural Resources, Changchun 130026, China)

  • Min Chen

    (College of Construction Engineering, Jilin University, Changchun 130026, China
    Shanghai Geotechnical Engineering Detecting Centre Co., Ltd., Shanghai 200436, China)

  • Jian Song

    (Sulige Gas Field Development Company, PetroChina Changqing Oilfield, Xi’an 710018, China)

  • Yafei Wang

    (College of Construction Engineering, Jilin University, Changchun 130026, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Natural Resources, Changchun 130026, China)

  • Yingrui Ma

    (College of Construction Engineering, Jilin University, Changchun 130026, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Conditions, Ministry of Natural Resources, Changchun 130026, China)

Abstract

The exploitation of challenging oceanic gas hydrate reservoirs with low permeability and permeable boundary layers faces the challenges of methane leakage and low production. Considering this aspect, a novel five-spot injection–production system combined with hydraulic fracturing was proposed. In particular, the potential of this development mode, including hydrate dissociation, gas production, and gas capture, was evaluated in comparison with a three-spot injection–production system. The results showed that increasing the fracture conductivity cannot prevent CH 4 leakage in the three-spot, and the leakage accounted for 5.6% of the total gas production, even at the maximum fracture conductivity of 40 D·cm. Additionally, the leakage amount increased as the well spacing increased, and the leakage accounted for 36.7% of the total gas production when the well spacing was 140 m. However, the proposed development mode completely addressed CH 4 leakage and significantly increased gas production. The average gas production rate reached 142 m 3 /d per unit length of the horizontal section, which was expected to reach the commercial threshold. The variance analysis indicated that optimal plans for the challenging hydrates in the Shenhu area were well spacing of 100–120 m and fracture conductivity greater than 20 D·cm.

Suggested Citation

  • Shuaishuai Nie & Chen Chen & Min Chen & Jian Song & Yafei Wang & Yingrui Ma, 2022. "Numerical Evaluation of a Novel Development Mode for Challenging Oceanic Gas Hydrates Considering Methane Leakage," Sustainability, MDPI, vol. 14(21), pages 1-22, November.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:21:p:14460-:d:962756
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    References listed on IDEAS

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