井下管串缓蚀技术研究和影响缓蚀剂性能因素探讨  

CORROSIVITY OF H_2S/CO_2/BRINE SYSTEMS IN OIL/GAS WELLS AND DEVELOPMENT OF S,P,N-CONTAINING CORROSION INHIBITOR CT2-12

作　　者：熊楚才[1] 

机构地区：[1]四川省石油管理局天然气研究所

出　　处：《油田化学》1993年第2期150-154,共5页Oilfield Chemistry

摘　　要：针对石油天然气井中H_2S-CO_2-卤水系统引起的腐蚀,研制了一种水分散性有机硫磷氮缓蚀剂CT2-12,可将腐蚀速率控制在0.0760mm/a以下,基本上不引起局部腐蚀,药剂费用可控制在合理的水平上。初步探讨了H_2S浓度(0-1000mg/kg)对不同CO_2分压下的腐蚀的影响。An S,P,N-containing corrosion inhibitor, CT2-12, being soluble in oil and dis persible in water, is prepared in laboratory for use in highly corrosive H_2S/CO_2/brine media of gas/oil wells. CT2-12 in 40 ppm can control corrosivity of H_2S or CO_2 media,both gaseous and liquid, to much less than 0.076mm/a. All experiments are conducted in a test autoclave containing 5% aqueous NaCl solution. It is shown that:①the corrosion rate of CO_2 is higher at 107℃ than that at 40℃ or 125℃;②the corrosion inhibition by CT2-12 against CO_2 depends on CO_2 partial pressure and, especially,on temperature;③the corrosion rate in H_2S increases with H_2S concentration;④the corrosion ratein H_2S+CO_2 is always less than that in CO_2 alone and a minimum corrosion is observed at some H_2S concentration depending on CO_2 partial pressure;⑤CT2-12 gives high extents of corrosion inhbition in all media studied: H_2S,CO_2,H_2S+CO_2 together with 5% aqueous NaCl.

关 键 词：缓蚀剂 采气井 井口装置 腐蚀 

分 类 号：TE985.6[石油与天然气工程—石油机械设备]