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failure pressure calculation of fracturing well based on fluid-structure interaction

Journal of Rock Mechanics and Geotechnical Engineering 2011年第S1期3卷 450-456页

作者： Jinzhou Zhao Lan Ren Min Li Yongming Li State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China

failure pressure is a key parameter in reservoir hydrofracturing operation. Existing analytical methods for calculating the failure pressure are based on the assumption that borehole fluid is under two extreme conditions: non-infiltration or complete infiltration. The assumption is not suitable for the actual infiltration process, and this will cause a great error in practical calculation. It shows that during the injection process, the dynamic variation in effective stress-dependent permeability has an influence on the infiltration, and the influence also brings about calculation errors. Based on the fluid-structure interaction and finite element method (FEM), considering partial infiltration during injection process, a numerical model for calculating rock failure pressure is established. According to the analysis of permeability test results and response-surface method, a new variation rule of rock permeability with the change of effective stress is presented, and the relationships among the permeability, confining pressure and pore pressure are proposed. There are some differences between the dynamic value of permeability-effective-stress coefficient observed herein and the one obtained by the classical theory. Combining with the numerical model and the dynamic permeability, a coupling method for calculating failure pressure is developed. Comparison of field data and calculated values obtained by various methods shows that accurate values can be obtained by the coupling method. The coupling method can be widely applied to the calculation of failure pressure of reservoirs and complex wells to achieve effective fracturing operation.

关键词： failure pressure fluid-structure interaction hydrofracturing coupling method response-surface method

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Study on Interaction Relationship for Submarine Pipeline with Axial Corrosion Defects

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China Ocean Engineering 2008年第3期22卷 359-370页

作者：陈严飞李昕周晶关炯 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology IKM Ocean Design Postboks 994064

Corrosion is one of the main reasons to cause the operation accident of submarine oil and gas transmission pipelines. As the major corrosion pattern in submarine pipelines, the effects of corrosion clusters consisting of the adjacent corrosion defects on failure pressure are investigated through non-linear large-deformation finite element method. Typically, the failure behavior and limit strength of submarine pipeline with axial groove- groove corrosion defect pair exposed to interhal pressure are analyzed. The effects of corrosion depth and axial spacing between a pair of corrosion defects on failure pressure are concluded. An interaction relationship for corrosion defects in pipelines, as well as prediction formulations for assessing the remaining strength of corroded pipelines are proposed. The expressions based on the proposed interaction relationship give more accurate results than the methods used in the existing design guidelines.

关键词： submarine pipeline corrosion defects interaction relationship damage mechanism failure pressure

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Limit Load Analysis of Pipes with Local Wall-thinning

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International Journal of Plant Engineering and Management 2010年第2期15卷 73-78页

作者： HE Jie LIU Yong-shou GOU Bing-wang ZHAGN Li-sheng YUE Zhu-feng Department of Engineering Mechanics Northwestern Polytechnical University Xi'an 710129 P. R. China Institute 650 of Hongdu Group Nanchang 330024 P. R. China

The loss of metal in a pipe due to corrosion usually results in localized thinned areas with various depths and an irregular shape on its surface. In this paper, a number of numerical models of pipes with different size defects are established. The limit loads of these pipes are researched using the nonlinear finite element method. The effect of defect parameters of the local wall-thinning pipes on the limit load is discussed. The results show that limit loads decrease obviously when the depths and lengths of the defect increase. However, when the defect length reaches a certain value, the effect of defect length on limit loads is not significant. These results are compared with the results of the method of API 579. When the defect length is adequately small, the results of FEM are in good agreement with the ones of APl 579, but when the defect depth and length is adequately large, the API 579 is not suitable.

关键词： defect pipe limit load failure pressure finite element method

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