The invention belongs to the technical field of preparation of blocking removers, and particularly relates to a composite chelating blocking remover for an
oil field and a preparation method of the composite chelating blocking remover. The composite chelating blocking remover for the
oil field is prepared from the following raw materials in percentage by
mass: 7 to 9 percent of 1-butyl-3-methylimidazole dodecyl
sulfonate, 5 to 7 percent of erucamide propyl hydroxypropyl sulfobetaine, 3 to 4 percent of di-(2-ethylhexyl)
sodium sulfosuccinate, 4 to 5 percent of
ethylenediamine di-o-hydroxyphenylacetic acid, 5 to 7 percent of N, N '-di (2-hydroxybenzyl)
ethylenediamine-N, N'-bis (2-hydroxybenzyl)-N, N '-bis (2-ethylhexyl)-N, N'-bis (2-hydroxybenzyl)-N, N '-bis (2-hydroxybenzyl)-N, N'-bis (2-hydroxyphenyl)-N, N '-bis (2-hydroxyphenyl)-N, N'-bis (2-hydroxyphenyl)-N The
cleaning agent is prepared from the following components in percentage by weight: 3 to 4 percent of N, N '-diacetic acid, 2 to 3 percent of O-(3-(benzyloxy) propyl)
hydroxylamine, 1 to 2 percent of heptadecenyl hydroxyethyl imidazoline
quaternary ammonium salt, 1 to 1.5 percent of dimethyl diallyl
ammonium chloride homopolymer and the balance of water. The composite chelating blocking remover for the
oil field has excellent scale
dissolution rate and paraffin inhibition rate when being applied to complex scale blocking removal of the oil field.