Study on H₂S Corrosion Resistance of L245/825 Lined Steel Pipe Welding Gap

Abstract:

The exploitation of high acid wells is facing severe corrosion challenges in the A and B gas fields in Sichuan, thus using lined steel pipe is a reliable and cost-effective anti-corrosion measure. However, lined steel pipe welding involves dissimilar steel welding, and anti-corrosion performances will be affected if the welding process is unreasonable. So it is necessary to make evaluation for corrosion of lined steel pipe. In this paper, taking welding gap of L245/825 lined steel pipe as example, the anti-SSC performances of L245/825 straight and ring welding gaps in NACE A solution were studied by CR method, and anti-cracking performances of them were evaluated by laboratory experiments. Then corrosion performances of L245/825 lined steel pipe welding gaps and L360NCS carbon steel were studied in the corrosive environment found in the Tian Dong 5-1 high sour gas well. Laboratory and field tests show that straight and ring welding gaps of L245/825 lined steel pipe have good anti-environment and anti-cracking performances of electrochemical corrosion in the high acid environment. The technology of welding process selected in the paper is reliable. Research results provide references for welding operation of L245/825 lined steel pipe in high sour gas fields.

• Periodical: Advanced Materials Research (Volumes 160-162)
• Pages: 1264-1269
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.160-162.1264
• Online since: November 2010
• Authors: De Zhi Zeng, Yuan Hua Lin, Da Jiang Zhu, Hong Jun Zhu, Tan Gu, Li Ming Huang, Tai He Shi
• Keywords: Electrochemical Corrosion, Environmental Cracking, Hydrogen Sulfide (H₂S), L245/825 Lined Steel Pipe, Welding Gap

References

[1] Li Luguang, Huang Liming, Gu Tan, Li Feng. Corrosion Characters and Inhibition Methods for Sichuan Gas Fields. Chemical Engineering of Oil & Gas, 2007, 36(1): 46-54.

[2] Jiang Fang. In Lab. Evaluation Methods of Metal Materials for High Sour Gas Fields. Natural Gas Industry, 2004, 24(10): 105-107.

[3] Zeng Dezhi, Huang Liming, Lin Yuanhua. Material Evaluation and Selection of OCTG and Gathering Lines for High Sour Gas Fields. SPE 131943, 2010, 6.

DOI: 10.2118/131943-ms

[4] Головин С.В. Металличские трубопроводы с плакировкой из коррозионно-стойкого сплава. Газ. пром-сть, 1992, (9): 30-31.

[5] Specification for CRA Clad or Lined Steel Pipe. API Specification 5LD Second Edition, (1998).

[6] GOMEZ X, ECHEBERRIA J. Microstructure and mechanical properties of Carbon steel A2102 superalloy Sanicro 28 bimetallic tubes[J]. Material Science and Engineering, 2003, 348(122): 180-191.

DOI: 10.1016/s0921-5093(02)00686-x

[7] Rommerskirchen I. New progress caps 10 years of work with BuBi pipes. World Oil, 2005, 226(7): 69-70.

[8] NACE TM 0177, Labortory testing of metals for resistance to sulfide stress cracking and stress corrosion cracking in H2S environments.

[9] ISO15156, Petroleum and natural gas Indus-tries—Materials for use in H2S-containing environments in oil and gas production.

DOI: 10.3403/bseniso15156

[10] Zeng Dezhi, Gu Tan, Huang Liming. Evaluation Methods for Anti-SSC Performance of Lined Steel Pipe Ring Welding Gap. Symposium of Production Technology Development and Application of Lined Steel Pipe/Plate, Beijing. 2008, 10, 100-102.