随着酸性油气田的陆续出现,钻杆在酸性环境下腐蚀性能的研究显得尤为重要.采用金相显微镜、万能试验机、冲击试验机、扫描电镜、能谱仪等对不同热处理后V150钻杆材料的性能进行了研究.结果表明:热处理可以提高V150钻杆材料的抗硫化氢应力腐蚀(SSC)性能及氢致开裂(HIC)性能;二次回火对V150钻杆材料的力学性能及腐蚀性能影响不大.夹杂和缺陷是导致V150钻杆材料抗SSC性能降低的主要原因.HIC试验后试样的主要腐蚀产物为Fe和Mn的硫化物,Cu,Ni等元素有利于提高G105钻杆材料的抗HIC敏感性.
As acid oil-gas fields appear in succession, the research of corrosion performance of drill pipe in acidic environment is particularly important.Corrosion properties of V150 drill pipe material after different heat treatment were investigated by means of microscope, universal testing machine, impact tester, scanning electron microscope and energy spectrometer and so on.The results showed that heat treatment can improve the resistance to hydrogen sulfide stress corrosion (SSC) and hydrogen induced cracking (HIC) performance of V150 drill pipe materials.The mechanical properties and corrosion resistance of V150 drill pipe materials were not affected by secondary tempering.Inclusions and defects are the main causes which reduce resistance to SSC.The main corrosion products were Fe-sulfide and Mn-sulfide after hydrogen induced cracking test.In addition, Cu, Ni can improve resistance to HIC.
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