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首页> 外文会议>2001 International gas research conference >CONSTRUCTION AND OPERATION OF GAS WELLS IN PERMAFROST
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CONSTRUCTION AND OPERATION OF GAS WELLS IN PERMAFROST

机译：多年冻土气井的建设和运营

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The paper discusses specific features of the construction and operation of gas wells in permafrost, the conditions of permafrost spread and its characteristic features in the north of Western Siberia, the thickness of permafrost over large gas deposits in the Pur-Nadym region and gives a schematic map of permafrost over gas deposits in the Pur-Nadym region. The paper also analyzes the dynamics of migration of the phase transition boundary around the gas well during its construction, conservation and operation. Analytical expressions are given to determine the time of the onset of thawing, the rate of thawing zone spread and reverse freezing in the presence of thermal resistance of the wellbore, derived within the framework of thermal balance technique. The paper also analyzes techniques of thermal and thermal erosion effect on permafrost in the process of drilling a well and the techniques of protecting wells from the effect of phase transitions during drilling and operation of wells. In particular a formula was developed for selecting admissible temperature of the drilling mud, which leaves permafrost intact. The paper also discusses the problem of controlling hydrates during the operation of gas wells in the North. It also substantiates the use of thermally insulated gathering lines to prevent hydrate formation.
机译：本文讨论了多年冻土气井建设和运营的特点，多年冻土的扩散条件及其在西伯利亚西部北部的特征，Pur-Nadym地区大型气藏的多年冻土厚度，并给出了示意图。 Pur-Nadym地区的多年冻土覆盖天然气沉积物的地图。本文还分析了气井在建造，保存和运行过程中相变边界迁移的动力学。给出了解析表达式，以确定在热平衡技术框架内得出的解冻开始时间，解冻区扩展速率和在井筒存在热阻的情况下的反向冻结。本文还分析了钻井过程中热力和热侵蚀对永久冻土的影响的技术，以及在钻井和钻井过程中保护井免受相变影响的技术。特别是开发了一个公式，用于选择钻井泥浆的允许温度，从而使多年冻土保持完整。本文还讨论了在北部气井作业期间控制水合物的问题。它还证实了使用隔热收集管线来防止水合物形成。

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