同时它还与井内压力平衡，井壁稳定，套管和钻柱强度设计密切相关。
Meanwhile, underground cycle temperature is also related to the pressure balance in a well, the stability of well bore and the design of casing and string.
本文通过物料平衡和热平衡计算得到了有关技术数据，论述了三套管预热器的改造内容。
Relevant technical data were obtained from material equilibrium calculation and heat energy equilibrium calculation in this paper.
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