With decreasing production, hydrocarbon-producing risers may suffer liquid accumulation. The mechanism behind liquid accumulation is that with decreasing mixture velocity in the riser, there is slip between the gas-liquid and oil-water phases (i.e. the relative velocity between phases increases). This can result in unstable production and/or pulsating liquid production. In addition, liquid accumulation gives an increased pressure drop in the riser, meaning production may have to be shut prematurely.
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