The effect of drag reducing agents on corrosion in multiphase flow

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:352540

Kang, C; Jepson, W P; Gopal, M ^[1]

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1. Ohio Univ., Athens, OH (United States). Dept. of Chemical Engineering

The effect of drag reducing agents (DRA) on corrosion and flow regime has been studied in a 10 cm diameter, 18 m long plexiglass flow loop in 50% oil/water mixtures with carbon dioxide gas. Superficial liquid velocities between 0.1 and 1 m/s and gas velocities between 1 and 10 m/s respectively were studied. The corrosion rate was measured for stratified, slug and annular flow. The height of liquid film, slug velocity, and slug frequency were obtained from the video image using a super-VHS camera. The DRA effectiveness was examined for DRA concentrations between 0 and 75 ppm. Flow regimes maps were determined with 25 and 75 ppm DRA. These results were compared to the flow regime map with no DRA. The results indicate that the transition from stratified to slug flow is obtained at a higher superficial liquid velocities. This resulted in much lower corrosion rates due to the elimination of the highly turbulent slugs. The corrosion rate for stratified and annular flow did not generally reduce with adding DRA concentrations. For slug flow, the slug frequency decreased with the addition of 50 ppm DRA. This led to decrease of corrosion rate by almost 50%

• OSTI ID: 352540
• Report Number(s): CONF-980316--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
CARBON DIOXIDE
CARBON STEELS
CORROSION
DRAG
FLOW VISUALIZATION
MULTIPHASE FLOW
PETROLEUM
PIPELINES