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    套管射孔后抗擠強(qiáng)度有限元分析

    Finite Element Analysis on Collapse Resistance of Casing after Perforating

    • 摘要: 針對目前等效應(yīng)力準(zhǔn)則已不適合衡量射孔套管抗擠強(qiáng)度的情況，采用非線性屈曲方法，建立Ф177.8 mm×10.36 mm 895.7 MPa鋼級射孔套管三維有限元模型，對比套管射孔前后的擠毀規(guī)律，分析孔徑、布孔密度及相位角變化對射孔套管射孔抗擠強(qiáng)度的影響。分析認(rèn)為：套管的徑向位移隨著載荷的增加呈非線性增加；孔徑變化對射孔套管抗擠強(qiáng)度有較大的影響，隨孔徑增大而降低；孔密變化對射孔套管抗擠強(qiáng)度有一定影響，隨孔密增大而略微降低；相位角變化對射孔套管抗擠強(qiáng)度影響不明顯。

       

      Abstract: Addressing the fact that the equivalent stress criterion is no longer suitable for measuring the collapse strength of a peforated casing，a non-linear bulkling technique is adopted to establish a 3-dimensional finite element model of the Ф177.8 mm×10.36 mm 895.7 MPa peforated casings.Collapsing patterns of the casings before and after peforating are compared.The influences of the changing of different peforating diameters，distribution densities and phase angles on collapse strengh of the peforated casings are analyzed.The analysis leads to the following conclusion.The radial displacement of a casing non-linearly increases with the increasing of the load.The peforating diameter has significant influence on the collapse strength of a peforated casing，i.e.，the collapse strength decreases when the peforating diameter increases.The peforating density has certain influence on the collapse strength of a peforated casing，i.e.，the collapse strength slightly decreases when the peforating density increases.The phase angle has no obvious influence on the collapse strength of a peforated casing.

       

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