Patent ID: 8461088
Filing Date: 2013-06-11
Classification: C02F,C07F,C09K

Abstract:
1. A method for oil recovery comprising the step of injecting into marine oil wells an aqueous solution of an aminoacid phosphonic acid scale inhibitor in a level of from 0.1 to 100000 ppm, where the scale inhibitor is selected from the group consisting of: i. aminoacid alkylphosphonic acids having the formula wherein A wherein A is independently selected from C B is an alkylphosphonic acid moiety having from 1 to 6 carbon atoms in the alkyl group and x is an integer of from 1 to 10, and ii. aminoacid alkylphosphonic acids having the formula wherein A wherein R and R′ are independently selected from C compounds wherein R and/or R′ are electron rich moieties containing, at least, one lone pair of electrons, which moiety is directly attached to an aromatic moiety by a covalent bond; or aromatics wherein at least one of the carbon atoms has been substituted by a heteroatom; and compounds, in the event R is —C(X)(R″)(R′″) and R′, R″ and R′″ are hydrogen wherein X is an electron withdrawing group selected from NO A A B is an alkylphosphonic acid moiety having from 1 to 6 carbon atoms in the alkyl group and y is an integer in the range of from 1 to 10.