Petroleum Development Oman (PDO) is currently operating and developing number of high pressure sour gas projects with high salinity (exceeding 200,000 ppm of NaCl). This paper gives an insight into the challenges with these combinations of H2S, pressure and chloride and provides cases of field history, explanation regarding material selection framework and technical challenges during the design, execution and operating phases of sour service projects. Some of the main challenges are a) accuracy of design input assumptions (e.g. unconventional high chloride levels carry over into process equipment downstream of the inlet separator) b) definition of material application limits (e.g. defining proper operating envelop for material performance) c) materials quality (e.g. optimum requirements for materials specifications). This paper addresses the challenges to provide example of engineering solutions through the use of corrosion resistant alloys and non metallic materials to maintain the integrity of flowlines and process equipment in severe sour service.

Subject
Corrosion resistant materials, Costs, Materials failure, Corrosion failures, Materials, Manufacturing, Sour environments, Industries, Materials selection, Inspection, Fluids, Equipment, Chlorides
Keywords:
Sour, H2S, corrosion resistant alloys (CRA), quality, application limits, quality improvement
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2017
Association for Materials Protection and Performance (AMPP)
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