Hi,
I need forum expert guide related to Methanol as Hydrate Inhibitor. Sour gas coming from plant inlet separator has very small amount of saturated water (0.02 mole% in 350MMSCFD gas) but due to low temperature and high pressure, system is in hydrate formation region. This gas is being transported to another plant via 35km long pipeline and during winter, small amount of water drop out is observed along the pipeline. Pipe size is 24" and water at pipeline outlet is around 2bbl/d while along the pipeline it is 3bbl constant (resulted extracted from Olga).
As system is in hydrate region, it is proposed to inject Methanol as there is no MEG recovery and circulation system available. But from PVTSim I observed that up to certain amount of Methanol, the hydrate formation curve is not shifted to left but after certain amount the curve is drastically shifted to right and even not covering full operating window. This is some surprising to me. Is this due to reason that water is too low to dissolve methanol and maximum Methanol is vaporized? Please shed your experienced light on this. How this system can be justified with methanol injection or some other mitigation has to considered.
Attached is the snap shots with different Methanol injections rates.
Thanks in advance.