考虑三维裂缝扩展模型的岩石力学参数反演
首发时间:2010-10-21
摘要:采用动态应力强度因子积分公式作为裂缝垂向延伸的判据,使新模型兼具拟三维模型的简单和真三维模型的精确。利用裂缝宽度既与裂缝净压力有关,又与杨氏模量相关的特点,建立不同时间段的井口压力与弹性模量之间的对应关系曲线。求解杨氏模量时,应用了假设法和经典四阶龙格-库塔方法。井底压力与考虑三维裂缝扩展模型时的就地岩石力学参数模型的建立,使得就地岩石力学参数的评估结果更符合实际。该方法可用来进行实时分析,也可进行压后评估,对提高压裂设计的水平和低渗难采储量的经济开发效益,具有重要的现实意义。
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Consider 3D Crack Extension Model Of Rock Mechanics Parameter Inversion
Abstract:Used integral formula of dynamic stress intensity factor as the vertical extension of the criterion, the new model both have the simplicity of proposed 3D model and the precision of true 3D model. Make use of the relationship among crack width, net-pressure and Young's modulus, I have estabished the corresponding curve between wellhead pressure of different time periods and elastic modulus. When solving Young's modulus, apply the method of hypothesis and classics fourth order Runge-Kutta,Bottom hole pressure and the models of considered 3D crack propagation model in situ rock mechanics parameters, have made the assessment of situ rock mechanics parameters more realistic. The method not only can be used to conduct real-time analysis and press post-evaluation, but also has important practical significance for improve the level of fracturing and hypotonic difficult to recoverable reserves of economic development benefits.
Keywords: rock mechanics 3D model fracturing design
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No.4388399545308128****
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