Stress corrosion cracking of high-strength drill pipe in sour gas well

Abstract

In high sour gas reservoir drilling process, it happens occasionally that high-strength drill pipe suffers brittle fracture failure due to stress corrosion cracking, and poses serious hazard to drilling safety. To solve this problem, this paper studied the stress corrosion cracking mechanism and influencing factors of highstrength drill pipe in sour environment with hydrogen permeation experiments and tensile tests. We simulated practical conditions in laboratory and evaluated the stress corrosion cracking performance of the high-strength drill pipe under conditions of high stress level. For the problems occurring in use of high-strength drill pipe on site, the paper proposed a technical measure for slower stress corrosion cracking.

Keywords

sour environment / high-strength drill pipe / stress corrosion cracking

References

[1] Yurmuary Diaz, Roberto Villalba, et al. Bad Practices In Drilling Operation Promoting Corrosion Failures under High Stress[C]. SPE, 05116

[2] Schuetzde AE, Robertson WD Hydrogen Absorption, Embrittlement and Fracture of Steel[J]. Corrssion, 1957 437-458.

[3] Dunlop AK Stress Corrosion Cracking of Low Strength, Lowalloy Nickel Steels in Sulfide Enviroments[J]. Corrssion, 1978 88-95.

[4] Erlings JG, Nauta J The Effect of Slow Plastic and Elastic Straining on Sulphide Strerss Cracking and Hydrogen Embrittlement of 3.5%Ni Steel and API 5L X60 Pipe-Line Steel[J]. Corrosion Science, 1987 1 153-1 167.