泡沫欠平衡钻地热井井筒多相流特性研究
Study on Characteristics of Multiphase Flow in Foam Underbalance Drilling Geothermal Well Wellbore
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- 引用格式:
-
曹献平,?摇旷曦域,刘英波,李海旭.泡沫欠平衡钻地热井井筒多相流特性研究[J].天然气与石油,2013,31(4):0.doi:
.Study on Characteristics of Multiphase Flow in Foam Underbalance Drilling Geothermal Well Wellbore[J].Natural Gas and Oil,2013,31(4):0.doi:
- DOI:
- 作者:
- 曹献平1?摇 旷曦域1 刘英波2 李海旭1
- 作者单位:
- 1.西南石油大学油气藏地质及开发工程国家重点实验室，2. 中国石油胜利石油管理局孤岛采油厂垦利油藏经营管理区
- 关键词:
- 地热井；超高温；温度分布；理论模型；相变
Geothermal well； Ultra-high temperature； Temperature distribution； Theoretical model； Phase transition
- 摘要:
- 针对泡沫钻超高温地热井井筒泡沫流体可能发生相态变化的情况，提出了地热井泡沫钻井井筒物性参数计算方法。基于泡沫相变判别模型，结合泡沫钻井理论模型和气体钻井理论模型，建立了适用于超高温地热钻井的高温泡沫相变耦合流动计算模型。通过数值计算，得到了井筒物性参数分布。计算结果表明，井筒是否相变取决于气液注入比和地层温度；同时，泡沫流体在高温下发生相变后，其物性参数均有较大突变，但在一定的注入气液比条件下仍能保证有效携岩。
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.
