Corrosion failure of compressed-natural-gas transmission lines
Internal corrosion of pipelines carrying lift gas for and production from gas-lifted wells is a widespread phenomenon and can be quite severe. Production of water from water-drive reservoirs combined with gas and CO{sub 2} is the major cause of corrosion. CO{sub 2} dissolved in saltwater forms an acidic brine solution that attacks steel pipes. This corrosive degradation of pipeline material may take the form of weight-loss corrosion or embrittlement. The distinguishing feature of a system attacked by CO{sub 2} is heavy localized pitting. High production rates in corrosive, high-water-cut wells accelerates corrosion attack. CO{sub 2} and water form carbonic acid, which interacts with iron to form water-soluble iron bicarbonate and water-insoluble iron carbonate corrosion products. The paper describes influencing factors in corrosion, test results, failure analysis, and corrosion control. It is concluded that: (1) injection of a film-forming amine inhibitor is an effective method of corrosion control for a compressed-gas transmission line; and (2) the amine inhibitor should be sprayed into the transmission line as a fine mist in the same direction as the gas flow.
- OSTI ID:
- 616307
- Journal Information:
- JPT, Journal of Petroleum Technology, Journal Name: JPT, Journal of Petroleum Technology Journal Issue: 5 Vol. 50; ISSN 0149-2136; ISSN JPTJAM
- Country of Publication:
- United States
- Language:
- English
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