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.
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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