Patent Number: 6,251,836

Title: Hydrate inhibition

Abstract: A hydrate inhibitor comprising a blend of an additive (i) and at least one of an additive (ii) and an additive (iii) wherein additive (i) is a polymer of an ethylenically unsaturated N-heterocyclic carbonyl compound, with 6-8 ring atoms in the heterocyclic ring, additive (ii) is a corrosion inhibitor and additive (iii) is a salt of formula (I):[R.sup.1 (R.sup.2)XR.sup.3 ].sup.+ Y.sup.- 1/v, I wherein each of R.sup.1, R.sup.2 and R.sup.3 is bonded directly to X, each of R.sup.1 and R.sup.2, which may be the same or different is an alkyl group of at least 4 carbons, X is S, NR.sup.4 or PR.sup.4, wherein each of R.sup.3 and R.sup.4 which may be the same or different represents hydrogen or an organic group, with the proviso that at least one of R.sup.3 and R.sup.4 is an organic group of at least 4 carbons, especially at least 5 carbons, and Y is an anion of valency v, wherein v is an integer of 1-4.

Inventors: Duncum; Simon Neil (Bracknell, GB), Edwards; Antony Roland (Beverley, GB), James; Keith (Banstead, GB), Osborne; Christopher George (Sandhurst, GB)

Assignee: BP Exploration Operating Company Limited

International Classification: C10L 3/00 (20060101); C09K 003/00 (); C09K 007/06 (); C07C 009/00 ()

Expiration Date: 06/26/2018