Effect of Corrosion Inhibitor on Water Wetting and Carbon Dioxide Corrosion In Oil-Water Two-Phase Flow
نویسندگان
چکیده
LI, CHONG, Ph.D., June 2009, Chemical Engineering Effect of Corrosion Inhibitor on Water Wetting and Carbon Dioxide Corrosion In Oil-Water Two-Phase Flow (198 pp.) Director of Dissertation: Srdjan Nesic The internal corrosion of flowlines and pipelines made from carbon steel is encountered in the oil and gas industry. The corrosion process is primarily associated with the presence of free water in offshore or onshore production, particularly when it is accompanied by carbon dioxide gas. Corrosion inhibitor injection in oilfields is a very common and useful method for pipeline internal corrosion prevention. There is a need to understand the physics of phase wetting, carbon dioxide corrosion and the effect of corrosion inhibitor on those two processes in oil-water two-phase flow. In this study, the flow patterns and phase wetting regimes of oil-water two-phase flow were experimentally investigated in a large scale flow loop. Five major flow patterns were observed within the test flow conditions by flow visualization. Three types of phase wetting regimes (water wetting, oil wetting and intermittent wetting) were found by using a carbon steel test section consisting of wall conductance probes, wall sampling and corrosion monitoring. Based on experimental results, phase wetting maps were generated for model oil and five crude oils in the flow loop tests. Following the large scale flow loop tests, a small scale flow apparatus, called a doughnut cell was developed to simulate phase wetting occurring in oil-water two-phase
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