| 围压下泥岩断裂韧性测试与解释方法 |
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| 引用本文： | 张广清,陈勉,金衍,王学双.围压下泥岩断裂韧性测试与解释方法[J].力学学报,2004,12(4):431-435. |
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| 作者姓名： | 张广清 陈勉 金衍 王学双 |
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| 作者单位： | 1. 石油大学石油天然气工程学院,北京102249;
2. 松原市吉林油田钻井服务公司,松原138001;
3. 北京大学力学与工程科学系,北京100871 |
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| 基金项目： | 国家自然科学基金资助(批准号为50274054) |
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| 摘 要： | 根据围压条件下的断裂力学理论 ,采用双翼裂纹厚壁圆筒 ,对泥岩进行了不同围压和不同泥质含量条件下的人工岩样断裂韧性测试。建立了有限元方法解释断裂韧性的数值模型。在进行大量实验测试的基础上 ,通过回归分析表明 ,断裂韧性与围压、泥质含量有较好的线性统计关系。解决了水力压裂设计中断裂韧性参数的准确获取问题 ,有利于提高压裂设计、预测的精度
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| 关 键 词： | 断裂韧性 围压 有限元方法 |
| 收稿时间： | 2004-02-13 |
| 修稿时间： | 2004-04-10 |
MEASUREMENT AND INTERPRETATION OF SHALE TOUGHNESS UNDER CONFINING PRESSURES |
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| ZHANG Guangqing,CHEN Mian,JIN Yan,WANG Xueshuang.MEASUREMENT AND INTERPRETATION OF SHALE TOUGHNESS UNDER CONFINING PRESSURES[J].chinese journal of theoretical and applied mechanics,2004,12(4):431-435. |
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| Authors: | ZHANG Guangqing CHEN Mian JIN Yan WANG Xueshuang |
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| Institution: | 1. University of Petroleum,Beijing 102249;
2. Peking University,Beijing 100871;
3. Drilling service company of JIlin oil field,Songyuan 138001 |
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| Abstract: | Based on the fracture mechanics theory under confining pressure conditions, the authors test rock fracture toughness using the thick-wall cylinder specimens with double-wing fractures and different clay contents under various confining pressures. The authors then use the finite element model to interpret the toughness results. The regression analysis based on a number of experiments indicates that the relationships of fracture toughness with confining pressure and shale contents are linear with small errors. The experimental procedures and interpreting method presented in this paper assure a better accuracy for determination of fracture toughness for hydraulic fracturing than that obtained from experiments without confining pressures, and are thus favorable for improvement of hydraulic fracturing performance. |
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| Keywords: | Fracture toughness Confining pressure Finite element method |
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