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Thermal recovery of offshore coalbed methane reservoirs: Flow characteristics of superheated steam in wellbores

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  • Nie, Bin
  • Sun, Sijia

Abstract

Methane in coalbed methane (CBM) reservoirs is mainly in the adsorbed state, and has both free and dissolved states. The proportion of adsorbed methane can be as high as 90% or more. Field practice shows that low methane desorption efficiency is one of the keys affecting CBM development. The adsorption of methane is significantly affected by temperature, and the desorption efficiency increases with the increase of temperature. In this paper, the wellbore flow during the development of CBM reservoirs by injection of superheated steam is taken as the research object, and the superheated steam flow model is established considering the influence of seawater disturbance caused by the phase change of superheated steam. The study found: (a) In the formation section wellbore, the superheated steam has the highest temperature value. (b) The temperature of the superheated steam is affected by both the Joule Thompson effect and the heat loss effect. (c) The longer the wellbore in the seawater section, the lower the temperature of the superheated steam in the wellbore. (d) Superheated steam is only suitable for shallow sea conditions.

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  • Nie, Bin & Sun, Sijia, 2023. "Thermal recovery of offshore coalbed methane reservoirs: Flow characteristics of superheated steam in wellbores," Energy, Elsevier, vol. 266(C).
    • Handle: RePEc:eee:energy:v:266:y:2023:i:c:s0360544222031310
    DOI: 10.1016/j.energy.2022.126245
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    References listed on IDEAS

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    Cited by:

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    2. Li, He & Lv, Xuefen & Lu, Jiexin & Liu, Meng & Yang, Wei & Hong, Yidu & Liu, Ting & Lin, Baiquan & Wang, Zheng, 2024. "Effect of cyclic thermal stimulation on the pore structure and fluid space of coal and inspiration for coalbed methane production," Energy, Elsevier, vol. 289(C).
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