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    某油田含腐蝕坑缺陷油管適用性評價方法研究

    Evaluation Method for Applicability of Tubing with Corrosion Pits in Certain Oil Field

    • 摘要: 調(diào)研某油田含腐蝕坑缺陷油管的主要缺陷類型和應用工況，采用結(jié)構(gòu)服役安全可靠性理論分析，通過材料性能試驗及實物拉伸、內(nèi)壓爆破、外壓擠毀實物試驗，對含腐蝕坑缺陷油管的化學成分和性能進行評價；利用3σ準則，對比工況調(diào)研結(jié)果，確定缺陷油管在某油田不同井況下的適用條件。結(jié)果表明：修復后的油管材料性能滿足API Spec 5CT—2011標準要求，拉伸載荷和抗內(nèi)壓強度滿足SY/T 6417—2016標準要求，但50%試樣的抗外壓擠毀性能不能滿足SY/T 6417—2016標準要求；缺陷油管滿足機抽井、電泵井、低壓自噴井工況條件下的載荷要求。實際應用結(jié)果證明上述評價方法具有可靠性。

       

      Abstract: A research is performed on major types of defects and applying working conditions of tubings with corrosion pits in a certain oil field.Using the structure service safety and reliability theory as an analyzing method,the chemical composition and properties of the defected tubings with corrosion pits are evaluated through material performance test,real product tesile test,internal-pressure burst test and external-pressure collapse test.Applying the 3σ criterion and comparing with the investigations of the working conditions,the terms for defected tubings to be applicable under different well conditions of a certain oil field are determined.The results show that the material properties of a repaired tubing meet the requirements of API Spec 5CT-2011,the tensile load and anti-internal pressure strength meet the requirements of SY/T 6417-2016,while the anti-external-collapse properties of 50% of the samples do not meet the requirements of SY/T 6417-2016.Defected tubings can meet the load requirements under working conditions such as rod puming well,submersible pump well and low-pressure flowing well.Real application results approve that the above-mentioned evaluation method is reliable.

       

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