本研究模擬施作接近實際井底套管水泥熱應力變化之實驗工作，先以ANSYS有限元素軟體模擬，評估套管水泥因溫度變化致熱應力變化最可能發生破壞之結合界面。經實際進行不同溫度變化範圍之套管水泥結合界面疲乏破壞試驗，並建立溫度變化循環之套管水泥封固結合界面疲乏破壞之試驗系統。本研究以ANSYS有限元素軟體建立套管水泥受經常熱應力變化時最易發生徑向張應力破壞位置之數值分析評估技術。經評估在30℃～115℃、55℃～115℃、80℃～115℃溫度變化時，其最大熱應力變化範圍分別為22.50~ -59.94 MPa、10.91~ -1.90 MPa、5.23~ -1.90 MPa，其對應實驗明顯疲乏破壞之循環次數分別為第5~24次、第450~525次，而80℃～115℃變化時即使在3125次以上仍無明顯大幅降壓。兩種不同溫差套管水泥熱應力（S, Mpa）變化對循環破壞次數（N）之對數關係可表示為：log(S) = 1.3546-0.000605*log(N)。

The purpose of this work was to study the casing cement interface debonding due to frequent temperature changes. A finite element software ANSYS was used to design laboratory experiments and to check the experimental results. A system of testing casing cement bonding interface fatigue failure due to temperature fluctuations was established in the laboratory. A numerical analysis technique was developed to evaluate the most possible failure location of tensile stress when casing cement frequently encountering thermal stress changes. The results showed the ranges of the largest thermal stress variation are 22.50 ~ -59.94 MPa, 10.91 ~ -1.90, and 5.23 ~ -1.90 for the cases of temperature changes of 30℃ ~ 115℃, 55℃ ~ 115℃, and 80℃ ~115℃, respectively. For the cases of temperature changes of 30℃ ~ 115℃ and 55℃ ~ 115℃, the obvious fatigue failure cycle numbers were 5~24 and 450~525, respectively. No obvious fatigue failure was observed for 80℃ ~ 115℃ fluctuations when the cycle number reached 3125. The correlation between thermal stress variations on casing cement and the number of cycles was established in this study.

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