| 研究生: |
林政億 Lin, Cheng-Yi |
|---|---|
| 論文名稱: |
以破壞力學分析水力破裂法之研究 A Laboratory Study of the Hydraulic Fracturing by Fracture Mechanics |
| 指導教授: |
王建力
Wang, Chein-Lee |
| 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: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 112 |
| 中文關鍵詞: | 破壞力學 、破裂韌度 、應力強度因子 、水力破裂法 |
| 外文關鍵詞: | Fracture mechanics, Fracture toughness, Stress intensity factor, Hydraulic fracturing |
| 相關次數: | 點閱:148 下載:7 |
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水力破裂法為目前量測大地應力中較常使用方法之一,起源於1948年美國石油工業,最初為用來增加低滲透率地層中的石油產量,由於裂縫的開裂與大地應力有一定之關係,爾後漸漸發展成為量測大地應力的方法。由於水力破裂法使用簡便,因此成為最常使用之量測方法。本文研究內容主要依據Rummel(1987)之基本理論,自行規劃一套室內水力破裂試驗並利用數值分析軟體ANSYS,並將實驗所得之破壞壓力代入本研究所建立之數值模型,針對裂縫長度與裂縫再開裂壓力及應力強度因子之影響進行討論。
本研究發現:裂縫增長,將會使破壞壓力降低。實驗發現:經由室內試驗之破壞壓力代入數值模型所求之破裂韌度平均值皆大於三點彎曲試驗所得之破裂韌度。數值分析結果顯示:裂縫長度超過井孔半徑後,裂縫的增長對於再開裂壓力較無影響。
Hydraulic fracturing is one of the popular methods for measuring in-situ stresses. Based on the relationship between fracturing pressures and in-situ stresses, hydraulic fracturing has proved to be an effective method to measure in-situ stresses. This study attempts to set up a laboratory experiment of hydraulic fracturing based on the theory proposed by Rummel (1987). A numerical package, ANSYS, was also used and the parametric study was carried out in this study.
The results of the experiment show that the average values of fracture toughness are greater than those from three point bending test. This find that increase of fracture length tends to lower the fracturing pressure. The numerical analysis reveals the re-fracturing pressure are not effected by the fracture length when the fracture length is greater than the radius of borehole.
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