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《Natural Gas Industry》 2012-01
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A corrosion monitoring and controlling system for ground gathering and transportation lines in the Puguang Gas Field,Sichuan Basin

Yang Faping,Wang Guibo(Gas Production Plant of Puguang Branch of Zhongyuan Oilfield Company,Sinopec,Dazhou,Sichuan 636156,China)  
This paper aims to implement effective measures for internal corrosion control and monitoring in the Puguang Gas Field with a high content of H2S.In view of the wet gas mixed transferring process of Puguang gathering system,different types of on-line corrosion monitoring technologies such as the metal loss,Electrical Resistance(ER) Probe,Linear Polarization Resistance(LPR) Probe,Field Signature Method(FSM),are adopted together with many corrosion control methods like corrosion inhibitor precoating,continuous injection,batch processing,etc.Meanwhile,the detection of inner pipes and chemical analysis are made accompanied by the proper selection of corrosion monitoring points,corrosion inhibitor injection points,and sampling points for chemical analysis.Thus,a complete system is set up for the internal corrosion monitoring and control in the Puguang gathering and transportation process.After more than one year of practice,corrosion coupons have been changed for 6 times;internal corrosion monitoring,the so-called intelligent pigging,has been done twice in the whole line network.The actual field data shows that the annual corrosion rate of the whole line system is successfully controlled to be less than 0.0764 nm,which guarantees the safe and steady operation of the Puguang gathering and transportation lines.
【CateGory Index】: TE988
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