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Title: Inspection and repair of a sour crude oil pipeline
Category: Pigsource Papers
Downloadable: No
Project No.:
Research Agency:
Catalog No.: pg1036e
Date of Publication: not available
Price: $25.00 US
Authors: Wim Vranckx, Brian Hawke, and Derek Stoves
Abstract: Pipeline Pigging and Integrity Monitoring Conference: Houston, 1998 Introduction Petroleum Development Oman (P.D.O.) is the largest oil and gas producer in the Sultanate of Oman and operates a network of 12,000 kM of pipelines and flowlines, with diameters ranging from 150mm (6") to 1050mm (42"). Some of the pipelines date back to the start of production in 1967. The products transported are: * untreated crude oil to the main production stations. * dehydrated crude oil via the main transmission system to the tank farm and shipping terminal. * dry gas for the country's power generation. * associated gas for injection and gas lift operations. * production water for reservoir injection. PDO as part of its ongoing Pipeline Integrity Management Programme determined that there was a need to ensure that significant internal slot-shape corrosion defects were correctly identified and accurately dimensioned by MFL inspection. Furthermore, PDO required a suitable repair system. They have since 1992 successfully used the PII epoxy shell repair method. However there was a need to confirm its effectiveness when the internal corrosion penetrates the pipe wall and exposes the epoxy shell repair to sour crude product. This paper describes the studies to confirm i. the ability of PII MFL inspection to detect and accurately size internal slot shaped corrosion, and ii. explore the integrity of the epoxy shell repair. The successful use of the MFL inspection and the epoxy shell repair application to deep defects on a PDO 138 km, 24 inch diameter sour crude pipeline is described. Background MFL inspection Defects of narrow width (6-10mm), short axial length (10-40mm) and steep sided deep wall loss (60% wt), are difficult to detect let alone accurately size. After a market review PDO selected BG Pipeline Integrity International to assist in finding an inspection method to identify such slot shaped defects. Pull through tests of machined simulated defects produced a data base of 1500 points building a high confidence that satisfactory detection was indeed feasible. This enabled a defect algorithm to be developed and the selection of the MFL pig tailored to suit the particular defect type for the inspection of a 24" crude oil line 138km long. The pipeline was successfully inspected and its findings confirmed by control U.T. checks. Close co-operation between the operator and the specialist contractor during all stages of work from initial agreement on inspection specification through to final quality verification of actual inspection operation ensured the successful outcome. 2 Copyright 2001 Scientific Surveys Ltd. All rights reserved.
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