通过宏观检验、化学成分分析、金相分析、力学性能测试、扫描电镜和能谱分析等方法，对某井发生批量开裂的G105钻杆进行了分析。结果表明：该批钻杆硬度达到33 HRC，远高于NACE MR 0175-2009对抗硫化物应力腐蚀开裂（SSCC）材料最高硬度要求值22 HRC，钻杆的硫化物应力腐蚀开裂敏感性较高；钻杆开裂主要为硫化氢应力腐蚀而导致的脆性开裂，同时井底存在的CO₂和Cl^-加速了其腐蚀进程。建议在含有H₂S气体的环境下使用抗硫钻杆进行作业，从而有效防止钻杆发生硫化氢应力腐蚀开裂。

The batch cracking causes of G105 drill pipes in a well were analyzed by means of macro observation, chemical composition analysis, metallographic analysis, mechanical property test, scanning electron microscope and energy spectrum analysis and so on. The results show that the hardness of the drill pipe reached 33 HRC which was much higher than the required value of MR NACE 0175-2009 (≤22 HRC) for the sulfide stress corrosion cracking (SSCC) resistant material, so the SSCC susceptibility of the drill pipes was very high. The cracking of the drill pipes was brittle cracking mainly caused by the hydrogen sulfide stress corrosion, and at the same time CO₂ and Cl^-1 in the well accelerated the corrosion process. It was suggested that anti-sulfur drill pipes should be used in the environment containing H₂S gas to effectively prevent the drill pipes from hydrogen sulfide stress corrosion cracking.