Low dosage hydrate inhibitor (LDHI) is a hydrate inhibitor that requires a much lower concentration than thermodynamic hydrate inhibitor and does not have significant impact on the hydrate phase boundary. There are two types of LDHIs, kinetic hydrate inhibitor (KHI) and anti-agglomerant(AA).

Kinetic hydrate inhibitor

KHI works by slowing the hydrate nucleation. It ceases to work when the subcooling exceeds certain level.


AA allows hydrates to form, but keep them dispersed in small particles. It typically does not have the subcooling limit as KHI. However, it limitation lies at excessive high watercuts.