COUPON CORROSION RATES VERSUS HYDROGEN PROBE ACTIVITY

Oilwell corrosion rate determinations by equipment performance records, visual examination, ultrasonic testing, mechanical caliper surveys, corrosion product analyses, sentinel holes, test nipples, electrical and polarization resistance probes, coupons, galvanic and hydrogen probes, and film resistance probes are examined. Because of their various shortcomings, none produce entirely satisfactory data. Parameters such as velocity markedly influence rates and inhibitor performance. At 187 fps, an inhibitor may be only 10% as effective as it is at lesser velocities. Carbon dioxide partial pressure is an important factor and location of coupons in the system is critical. Temperature and exposure time also are important in determining rates. Case histories of gas wellhead attack related to hydrogen probe data and coupons are given. The histories show hydrogen probes to be effective in reflecting corrosion rates in the wells, indicating possible equipment failure, inhibitor persistence, and other effects. More work on correlation of coupon and hydrogen probe data is needed. /Author/

  • Availability:
  • Supplemental Notes:
    • Presented during Corrosion/74, March 4-8, 1974, Chicago, Illinois.
  • Corporate Authors:

    National Association of Corrosion Engineers

    P.O. Box 1499
    Houston, TX  United States  77001
  • Authors:
    • Fincher, D R
    • Nestle, A C
    • Marr, J J
  • Publication Date: 1976-2

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Filing Info

  • Accession Number: 00129503
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM