Crude Oil-Natural Gas Two-Phase Flow Pattern Transition Boundaries at High Pressure Conditions

摘要

The effects of pressure on flow pattern transition boundariesrnfor crude oil-natural gas two-phase flow were investigated.rnExperimental observations of flow patterns were carriedrnout for different pressures (200 and 450 psia) and inclinationrnangles (horizontal, +1 degree and vertical). Special attentionrnwas given to the stratified-intermittent transition and thernintermittent-annular transition for horizontal and inclinedrnflow, and the transition to annular flow for vertical flow, sincernthese boundaries were known to be sensitive to pressure.rnThe experimental results show that pressure affects thernstratified-intermittent transition for horizontal flow andrnslightly affects the intermittent-annular transition for inclinedrnflow and for vertical flow. The predictions of transitionrnboundaries by existing mechanistic flow pattern predictionrnmodels show good agreement for all transition boundariesrndescribed above.