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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2013 Vol.4

    Study on Characteristics of Multiphase Flow in Foam Underbalance Drilling Geothermal Well Wellbore
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    Key Words：Geothermal well； Ultra-high temperature； Temperature distribution； Theoretical model； Phase transition
    Abstract：For phase-transition occurring probably in foam fluid from ultra-high temperature geothermal foam drilling wellbore，a calculation method is proposed for physical parameters of geothermal foam drilling wellbore. Based on phase-transition discrimination model，combined with foam drilling theoretical model and gas drilling theoretical model，a coupling flow calculation model of high temperature foam phase-transition is established for superhigh temperature geothermal well drilling. Wellbore physical parameters can be obtained through numerical calculation. The results show that wellbore phase transition depends on gas-liquid injection ratio and formation temperature. After phase transition occurs，its physical parameters will change dramatically，but effective cutting-carrying can be still ensured in certain injection conditions.
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