某油井注氮气增压机在运行过程中,其二级排气管路与空冷箱二级冷却管束发生爆裂。采用宏观观察、化学成分分析、金相检验、硬度测试、红外光谱测试、开口闪点测试及物相分析等方法,对其爆裂原因进行分析。结果表明:二级、三级和四级增压管路内润滑油沉积和积炭严重,三级、四级压缩缸内压缩杆活塞环磨损严重,这使得体系内的温度和压力均升高,润滑油氧化和分解加速,积炭增多,排空管高温热辐射进一步加剧了低闪点可燃性物质的氧化与积炭的阴燃,导致体系内CO含量达到爆炸极限,从而引起二级排气管路与空冷箱二级冷却管束爆裂。

During the operation of a nitrogen injection booster in an oil well, the secondary exhaust pipeline and the air-cooling box secondary cooling tube bundle burst. By means of macroscopic observation, chemical composition analysis, metallographic examination, hardness test, infrared spectrum test, open flash point test and phase analysis, the causes of the burst were analyzed. The results showed that lubricant and carbon deposits were serious in the secondary, tertiary and quaternary booster pipelines, and the piston ring of compression rod in tertiary and quaternary compression cylinders was seriously worn, these increased the temperature and pressure in the system, accelerated the oxidation and decomposition of lubricating oil, and increased carbon deposit. The high temperature heat radiation of exhaust pipe further aggravated the oxidation of low flash point combustible material and smoldering of carbon deposits, which led to the explosion limit of CO content in the system, thus causing the burst of secondary exhaust pipeline and secondary cooling tube bundle of air-cooling box.