Method of completing a well with hydrate inhibitors

Details Method of completing a well with hydrate inhibitors Method of completing a well with hydrate inhibitors

E - Fixed Constructions

21

B

E21B 43/22 (2006.01) C09K 8/035 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2506925

Compositions for inhibiting the formation and/or growth of gas hydrates contain at least one low dosage kinetic hydrate inhibitor and at least one thermodynamic hydrate inhibitor. Kinetic hydrate inhibitors include aminated polyalkylene glycols of the formula: R1R2N[(A)a-(B)b-(A)c-(CH2)d-CH(R)-NR1]n R2 (I) wherein: each A is independently selected from -CH2CH(CH3)O- or - CH(CH3)CH2O-; B is -CH2CH2O-; a + b + c is from 1 to about 100; R is -H or CH3 each R1 and R2 are independently selected from the group consisting of - H, -CH3, -CH2-CH2-OH and CH(CH3)-CH2-OH; d is from 1 to about 6; and n is from 1 to about 4. Such gas hydrate inhibitor compositions are particularly efficacious in the treatment of media susceptible to gas hydrate formation that may occur during the extraction of natural gas and petroleum fluids, such as low boiling hydrocarbons, from a producing well, during transportation of such gas and fluids, and during processing of such gas and fluids.

Compositions permettant d'inhiber la formation et/ou la prolifération des hydrates de gaz, renfermant au moins un inhibiteur cinétique des hydrates en faible dose et au moins un inhibiteur thermodynamique des hydrates. Les inhibiteurs cinétiques des hydrates comprennent les polyalkylèneglycols aminés de formule R1R2N¬(A)a-(B)b-(A)c-(CH2)d-CH(R)-NR1|n R2 (I), où : chacun des A est, indépendamment des autres, -CH2CH(CH3)O- ou - CH(CH3)CH2O-; B est -CH2CH2O-; a + b + c se situe entre 1 et environ 100; R est -H ou CH3; chaque R1 et R2 est, indépendamment des autres, - H, -CH3, -CH2-CH2-OH ou CH(CH3)-CH2-OH; d se situe entre 1 et environ 6; n se situe entre 1 et environ 4. De telles compositions inhibitrices des hydrates de gaz sont particulièrement efficaces dans le traitement des milieux propices à la formation d'hydrates de gaz, laquelle peut survenir pendant l'extraction du gaz naturel et des produits pétroliers liquides, comme les hydrocarbures à faible point d'ébullition, à partir d'un puits de production, pendant le transport de ces gaz et liquides, et pendant la transformation de tels gaz et fluides.

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