Development of a Wellbore Flow Simulator (WELCARD-III) Applicable up to Annular-Mist Flow in Geothermal Wells. Effect of Heat Loss, Temperature and Pressure at Feed Point and Flow Rate on Appearance of Annular-Mist Flow.

DOI

Bibliographic Information

Other Title
  • 地熱井における環状噴霧流まで適用可能な坑井内流動シミュレータ（ＷＥＬＣＡＲＤ‐ＩＩＩ）の開発　　環状噴霧流の出現に及ぼす熱損失，流入点温度・圧力，総噴気質量流量の影響
  • Effect of Heat Loss, Temperature and Pressure at Feed Point and Flow Rate on Appearance of Annular-Mist Flow
  • 環状噴霧流の出現に及ぼす熱損失,流入点温度・圧力,総噴気質量流量の影響

Abstract

A method of calculation of heat loss from a production well to the surrounding formation has been developed and implemented into a wellbore flow simulator WELCARD-III which is a new version of WELCARD-II (Takahashi et a1., 1998). A comparison between computational results using WELCARD-III and the measured values of borehole temperature and pressure during production in the Kakkonda and the Mori geothermal fields in Japan was carried out and the computational error was within 5%, including cases with dissolved CO2 gas. The influence of parameters such as heat loss, temperature and pressure at the feed point and total mass flow rate on appearance depth of annular-mist flow was investigated. The summary of the results are as follows:<BR>1) As heat loss becomes larger, the flashing point and the depth at which annular-mist flow appears become shallower. This is due to the decrease in fluid temperature.<BR>2) As feed point temperature becomes higher, the flashing point and the depth at which annular-mist flow appears become deeper. The distance, furthermore, between the flashing point and the appearance depth of annular-mist flow becomes longer. This is due to the increase in saturated pressure.<BR>3) The feed point pressure shows little influence on the depth of annular-mist flow appearance.<BR>4) As total mass flow rate becomes larger, the flashing point and the depth at which annular-mist flow appears become deeper. The distance, however, between the flashing point and the depth at which annular-mist flow occurs becomes shorter. This is due to the increase in pressure loss.

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Details 詳細情報について

  • CRID
    1390282681105241344
  • NII Article ID
    130003624268
  • DOI
    10.11367/grsj1979.21.13
  • ISSN
    18835775
    03886735
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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