| 研究生: |
李彥佑 Li, Yen-yu |
|---|---|
| 論文名稱: |
儲氣田氣井套管水泥之封固性之研究 The Study of the Casing Cement Bonding in the Gas Well Reservoir |
| 指導教授: |
王建力
Wang, Chien-li |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 資源工程學系 Department of Resources Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 84 |
| 中文關鍵詞: | 套管水泥 、ANSYS 、疲勞破壞 |
| 外文關鍵詞: | fatigue failure, ANSYS, casing cement |
| 相關次數: | 點閱:109 下載:1 |
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儲氣田氣井套管水泥在氣井操作過程中,因井壁週期性壓力加載、氣層溫度變化,導致套管水泥段受到應力作用,而發生套管水泥封固能力喪失的現象,使井內的氣體逸漏出來,造成巨大的經濟損失。
本研究利用電腦輔助工程分析軟體 ANSYS,以中油公司TCS-A2 井為典型案例,模擬井壁壓力加載、溫度變化作用,井底之套管水泥段之應力表現。首先分析井壁溫度加載作用,井壁溫度、三種異質材料之力學參數對水泥段的應力關係。最後對週期性井壁壓力/溫度加載,造成套管水泥的疲勞破壞,作進一步的探討。
研究結果指出週期性井壁壓力/溫度加載下,井底與井壁溫差效應影響水泥段疲勞壽命Nf 甚鉅,當溫差由0℃增至10℃過程中,為造成套管水泥疲勞壽命大幅下降的主因,此時套管水泥之封固能力面臨相當大的考驗。其中水泥段疲勞壽命長短與否,水泥之力學參數也扮演很重要的角色,此外套管與水泥之熱膨脹係數的差異也是另一個考量的重點。
The loss of cement bond log in casing cement in gas well reservoir operation process could result in a serious gas migration and cause big economic loss. The stresses which result in the loss of cement bond log were induced by variations of wellbore pressure and temperature during the operating life of the well.
The study used a finite element analysis package, ANSYS, referring to the setting from TCS-A2 well of CPC. The analysis model carried out the all kinds of mechanical parameters simulate the stress behaviour in bottom hole’s casing cement by the effect of wellbore temperature loading. This study also investigated the fatigue behaviour of the cement by periodical wellbore pressure/temperature loadings.
The results indicate that when the difference of temperature is from 0℃ raise to 10℃ between the bottom hole and wellbore, the fatigue life of the casing cement will decrease greatly. Besides, the loss of cement bond log is related to mechanical properties and the difference between the casing and cement’s coefficient of thermal expansion.
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