10372 Predicction of Classic and Flow-Induced Internal Pipeline Top of the Line Corrosion (TLC) Mechanisms Using ICPM: Model Prediction Confirmation and Applicability in Gas Condensate Pipeline Operations

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Product Number: 51300-10372-SG

ISBN: 10372 2010 CP

Author: Patrick J. Teevens, Keith W. Sand and Philip J. Girard

Publication Date: 2010

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This paper investigates the potentially recurring and complex degradation issues where internal top-of-the-line (TOL or TLC) corrosion problems in a mature Alberta, Canada gas field have been observed over several years. As a test-case basis, an aging pipeline system (40+ years) with suspected TLC damage has been prevalent for a portion of its operational life with the problem indiscriminately appearing at various locations. The intended project deliverable was to conduct internal corrosion predictive modeling (ICPM) using a proposed and soon-to-be-released wet-gas internal corrosion direct assessment (WG-ICDA) approach for 17 pipeline regions with several hundred pipeline subregions in an attempt to confirm and unravel the nuances associated with possible TLC problems scattered throughout a large gas production and gathering system. However, the focus of this paper examines the prequalification test of the modeling conducted on a smaller 88.9 mm (3” nominal) pipeline which had been previously inspected via in-line inspection (ILI) but the results were not divulged until completion of the ICPM. The ICPM modeling platform utilized Broadsword’s in-house proprietary model called enpICDA™. It became readily apparent from the early stages of the modeling that the 88.9 mm pipeline system likely had other corrosion mechanisms occurring in the remaining pipe body which were inextricably linked by the operational dynamics of the system. Specifically, the active corrosion mechanisms are derived from the fluid hydrodynamic and mass transfer interactions of the wet gas. The bottom of the pipeline cannot be ignored in the context of TLC. It was positively determined that annual mist flow regimes exacerbate TLC "grooving" or "streaking".

Keywords: internal corrosion predictive modeling (ICPM), flow regime, mass transfer, fluid hydrodynamic, TLC, BLC