Copolymers and terpolymers of post modified polyacrylates as efficient gas hydrate inhibitors
AssigneeSaudi Arabian Oil Company
InventorsMuhammad Imran Ul-haq, Abdullah Al-Malki, Hassan Ali Al-Ajwad, Taras Y. Makogon
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Abstract
Gas hydrate inhibiting compositions include random polymers prepared from polyacrylates. The random polymers include at least one acrylate ester monomer in combination with at least one amine functional monomer. Methods for synthesizing the gas hydrate inhibiting polymers include polymerization of an acrylate then post-modifying a polyacrylate with an amine from at least one amine compound. Methods for inhibiting formation of clathrate hydrates in a natural gas pipeline include adding the gas hydrate inhibiting polymers to a natural gas pipeline.
Claims20
A gas hydrate inhibitor composition comprising a random polymer according to formula (I):
- where:
- R1 is independently (C4-C7) hydrocarbylene or (C4-C7) heterohydrocarbylene and is optionally substituted with at least one (C1-C3) alkyl;
- R2 is independently (C1-C10) hydrocarbyl or (C1-C10) heterohydrocarbyl;
- R3 is independently hydrogen or (C1-C8) saturated alkyl;
- R4 is independently (C1-C8) saturated alkyl;
- each R6 is independently selected from hydrogen, methyl, ethyl, or CH2OH;
- each R7 is independently selected from hydrogen, (C1-C5) alkyl, dialkylamine, or —CN;
- x is a molar fraction from 0 to 0.99;
- y is a molar fraction from 0.01 to 0.50;
- z is a molar fraction from 0 to 0.99;
- the sum of x and z is from 0.50 to 0.99;
- and
- the sum of x, y, and z is 1.
Dependencies are inferred from the claim text.