Hydrate inhibition is normally associated with batch treatments for the processes of start-up and shut-down (planned or unplanned). Continuous injection also occurs when there is induced cooling likely due to chokes and the natural cooling of pipelines by the cold ambient temperatures of the seabed. Methanol is one of the most common hydrate inhibitors used, particularly for subsea wells and in arctic regions where rapid cooling of the produced fluid flow (gas and water) can cause hydrate formation. Methanol is injected into the tree and sometimes downhole just above the subsurface safety valve while the fluids are hot. Some subsea developments in the deepwater GoM area inject methanol at rates of 20% to 40% of the water production rate.
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