SLOWING-DOWN OF HYDRATING Russian patent published in 1999 - IPC

FIELD: inhibition of natural gas at pumping-over oil and gas. SUBSTANCE: hydrate inhibitor used in proposed method is water-soluble polymer formed from N-substituted acrylamide having two substituted nitrogen-substituted groups R₁ and R₂ where R₁ is hydrocarbon group having 1 to 10 carbon atoms and 0 to 4 heteroatoms chosen from group consisting of nitrogen, oxygen, sulfur and their mixtures and R₂ is atom of hydrogen or hydrocarbon group having 1 to 10 carbon atoms and 0 to 4 heteroatoms chosen from consisting of nitrogen, oxygen and sulfur. On other side, R₁ and R₂ may be bound forming cyclic ring having 10 atoms containing group of 3 to 10 carbon atoms and 0 to 4 heteroatoms chosen from group containing hydrogen, oxygen, sulfur and their mixtures. Some of such inhibitors include poly (N-ethyl acrylamide), poly (N, N-diethyl acrylamide), poly (N-methyl, N-acrylamide), poly (isopropyl acrylamide), poly (propyl acrylamide), poly (N-cyclopentyl acrylamide), poly (cyclohexyl acrylamide), poly (cryloilpyrrolidine), poly (acryloilpiperidine), poly (acryloilmorpholine) and various N-substituted acrylamide copolymers. EFFECT: enhanced efficiency in treatment of liquid oil products having aqueous phase. 23 cl