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Sour Weld Corrosion Mitigation with a Low Dose Inhibitor

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Preferential weld corrosion offers a uniquely different mitigation challenge to operators of high throughput oilfield production in carbon steel pipelines. This has a significant impact on the expected lifetime of the pipeline and thus will require chemical inhibition programs to control such localized corrosion effects. As a part of OPEX these programs require field optimization whilst providing the desired level of corrosion protection at minimum inhibitor dose rate.A low dose corrosion inhibitor has been developed that inhibits sour corrosion of individual weld components of pre-corroded steel coupons prepared from pipeline material. Metallurgical analysis of the weld section extracted from the pipeline was performed which illustrated unusual composition of the material.The lower corrosion inhibitor dose also reduces the influence of secondary effects (including emulsion and foaming) eliminating the need for specialized formulation additives and the injection of additional chemistries. Due to the low water cut and the stratified flow regime of a subsea pipeline the partitioning behavior of the product was an important consideration during product development. Since the treatment of bacteria in the pipeline was necessary the compatibility of the inhibitor with the incumbent biocide was critical.This paper details the test work performed to develop a new inhibitor to prevent weld corrosion under sour conditions. The inhibitor was evaluated in numerous performance under including kettle tests high pressure autoclaves partitioning and autoclave weldment corrosion tests.

Product Number: 51319-13324-SG
Author: Jody Hoshowski
Publication Date: 2019
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$20.00
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Picture for Evaluation of Corrosion Inhibitor Functionality on the Mitigation of Preferential Weld Corrosion
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51318-10965-Evaluation of Corrosion Inhibitor Functionality on the Mitigation of Preferential Weld Corrosion

Product Number: 51318-10965-SG
Author: R. Barson / D. D. Korwin-Kochanowski / S. Turgoose / G. Economopoulos / G. E. Dicken
Publication Date: 2018
$20.00

The work conducted produced conditions where preferential weld corrosion initiated in uninhibited conditions and was sustained throughout inhibition. Two types of weld metallurgies; one weld consumable with 1% nickel, the second matched the parent pipe.
Picture for Evaluation of Preferential Weld Corrosion Susceptibility and Its Mitigation in Slightly Sour Conditions
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Evaluation of Preferential Weld Corrosion Susceptibility and Its Mitigation in Slightly Sour Conditions

Product Number: 51315-5640-SG
ISBN: 5640 2015 CP
Author: Ray Case
Publication Date: 2015
$20.00

Preferential Weld Corrosion (PWC) susceptibility was studied in a slightly sour wet gas piping system using electrochemical methods based on the “hockey puck” technique. Several corrosion inhibitors were evaluated to assess their performance in suppressing PWC.
Picture for 05275 Preferential Weld Corrosion of 1% Ni Welds:
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05275 Preferential Weld Corrosion of 1% Ni Welds: Effects of Solution Conductivity and Corrosion Inhibitors

Product Number: 51300-05275-SG
ISBN: 05275 2005 CP
Author: Stephen Turgoose, James W. Palmer, and Graeme E. Dicken, Capcis Limited
$20.00
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