CAJ | 학술논문

川东油气田天然气集输管道多次出现管道破裂穿孔等事故．利用X衍射、扫描电镜、电子探针、热重分析等方法对现场的腐蚀挂片和集输管道中收集的腐蚀产物进行了分析检测．结果表明：集输管道虽然经过三甘醇脱水工艺处理，仍遭受较严重的H2S腐蚀，腐蚀形态主要为局部坑蚀；集输管道中形成的腐蚀产物成分比较复杂，主要为FeS，FeS2，Fe3S4和Fe9S8，同时存在一定量的铁的氧化物和其它化合物；管道中腐蚀产物的热分析表明，在170℃～350℃温度区间，存在一个强放热反应，热焓值△H为-256．8 J／g，该反应可能为FemSn转化为FexOy反应．
천동유기전천연기집수관도다차출현관도파렬천공등사고．이용X연사、소묘전경、전자탐침、열중분석등방법대현장적부식괘편화집수관도중수집적부식산물진행료분석검측．결과표명：집수관도수연경과삼감순탈수공예처리，잉조수교엄중적H2S부식，부식형태주요위국부갱식；집수관도중형성적부식산물성분비교복잡，주요위FeS，FeS2，Fe3S4화Fe9S8，동시존재일정량적철적양화물화기타화합물；관도중부식산물적열분석표명，재170℃～350℃온도구간，존재일개강방열반응，열함치△H위-256．8 J／g，해반응가능위FemSn전화위FexOy반응．
New processes of dehydration with triglycol are applied in the transport of natural gasin Sichuan-east Datianchi oil/gas field. Accidents of cracking and perforation still occurred in thecollection pipe of natural gas transport. The spot loss-sample and corrosion product collected fromthe pipe were analyzed with X-ray diffraction, electron probe microscopy analysis (EPMA),scanning electron microscope .and thermal analysis. The analysis results show that the collectionpipe of natural gas transport suffered severe hydrogen sulfide corrosion though new processes ofdehydration had been introduced. The pattern of corrosion showed from loss-sample was pittingcorrosion. The components of corrosion product sample from the pipe were relatively complex,which mainly composed of FeS, FeS2, Fe3S4, and Fe9S8, some ferrous oxide composition andsomething else. Thermal analysis of corrosion product sample shows that a strong exothermicreaction exists between 170℃ to 350℃, the enthalpy value(△H) is about -256.8J/g.