Practical Failure Analysis

, Volume 1, Issue 2, pp 47–54 | Cite as

Role of microstructure in sucker rod string failures in oil well production

  • Sofiane Benhaddad
  • Glen Lee
Peer Reviewed Articles
  • 177 Downloads

Abstract

Sucker-rod pumps are operating in very aggressive environments in oil well production. The combined effect of a corrosive environment and significant mechanical loads contribute to frequent cases of failure of the rod string during operation. Standards and recommendations have been developed to control and avoid those failures. This study presents various failure cases of sucker rods in different applications. The heat treatment of the steel material and the resulting microstructure are an important factor in the behavior of the sucker rod. A spheroidized microstructure presents a weaker resistance to corrosion affecting the rod life. Non-metallic inclusions are a pitting preferential site leading to fatigue crack initiation. Heterogenous microstructure as banded martensite and ferrite/pearlite decreases the ductility of the material affecting the fatigue propagation resistance.

Keywords

corrosion-fatigue inclusions pitting steel microstructure sucker rod 

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References

  1. 1.
    NACE Standard MR0176,Metallic Materials for Sucker-Rod Pumps for Corrosive Oilfield Environments, NACE International, Houston, TX, 1994.Google Scholar
  2. 2.
    NACE Standard MR0174,Recommendations for Selecting Inhibitors for Use as Sucker Rod Thread Lubricants, NACE International, Houston, TX, 1995.Google Scholar
  3. 3.
    NACE Standard RP0195,Recommended Practice for Corrosion Control of Sucker Rods by Chemical Treatment, NACE International, Houston, TX, 1995.Google Scholar
  4. 4.
    API Specification RP11BR,Recommended Practice for Care and Handling of Sucker Rods, 8th ed., American Petroleum Institute, Washington, DC, Oct 1, 1989.Google Scholar
  5. 5.
    A.J. Sedricks:Int. Metal Rev., 1983, vol. 28 (5), p. 295.Google Scholar
  6. 6.
    G.S. Eklund:J. Electrochem. Soc., 1974, vol. 12, p. 467.Google Scholar
  7. 7.
    K.J. Blom:NACE Corrosion 82, n 87, NACE International, Houston, TX, 1982.Google Scholar
  8. 8.
    P.E. Manning:Corrosion, 1979, vol. 35, p. 151.Google Scholar
  9. 9.
    API Specification 5CT,Specification for Casing and Tubing, American Petroleum Institute, Washington, DC, 1999.Google Scholar
  10. 10.
    European Federation of Corrosion Publications,CO 2 Corrosion Control in Oil and Gas Production, M.B. Kermani and L.M. Smith, ed., n 23, Institute of Materials, London, 1997.Google Scholar
  11. 11.
    D.E. Cross:NACE Corrosion 93, n 118, NACE International, Houston, TX, 1993.Google Scholar
  12. 12.
    R.W. Manuel:Corrosion, 1947, vol. 3(9), pp. 197–206.Google Scholar

Copyright information

© ASM International - The Materials Information Society 2001

Authors and Affiliations

  • Sofiane Benhaddad
    • 1
  • Glen Lee
    • 2
  1. 1.Global Thermoelectric Inc.CalgaryCanada
  2. 2.Alliance Engineering and Inspection Ltd.CalgaryCanada

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