Chemical treatment solution for formation damage at near wellbore
An emulsion composition of treating near-wellbore obstruction comprising an aqueous phase in 0.5 to 40% by weight of total composition; an non-aqueous phase in 15 to 90% by weight of total composition; a surfactant un 2 to 60% by weight of total composition; and a compound having a Chemical structure I in 1 to 30% by weight of total composition R 1 —CONH—[R 2 —NH—R 3 ] n —HNOC—R 4 (Chemical structure I) in which R 1 , R 2 , R 3 and R 4 are linear, branched or aromatic carbon-containing substituents having 2 to 26 carbon atoms and n is an integer ranges from 1 to 100, wherein each of the substituents comprises an alkyl group, a carbonyl group, a carboxylic group, an amine group, or an amide group.
1. A microemulsion composition for treating formation damage at near-wellbore, comprising:
an aqueous phase present in 0.5 to 40% by weight of total composition;
a non-aqueous phase present in 15 to 90% by weight of total composition;
a surfactant in 2 to 60% by weight of total composition;
a pour point depressant in 5 to 40% by weight of total composition; and
a compound having a chemical structure I and present in a range of 1 to 30% by weight of total composition
R 1 —CONH—[R 2 —NH—R 3 ] n —HNOC—R 4 (Chemical structure I)
wherein R 1 and R 4 are branched carbon containing constituents having 8 to 12 carbon atoms;
in which R 2 and R 3 are linear or branched carbon containing constituents having 2 to 4 carbon atoms;
n is an integer in a range of 2 to 6;
wherein each carbon containing constituents of R 1 and R 4 comprises an alkyl group, carbonyl group, or carboxylic group; and
wherein each carbon containing constituents of R 2 and R 3 comprises an alkyl, amine, or amide group.
2. The composition according to claim 1 , further comprising a co-surfactant including C3 to C18 alcohols and present in a range of 1 to 30% by weight of the total composition.
3. The composition according to claim 1 , wherein the non-aqueous phase is selected from the group consisting of fatty acid ester and fatty ester.
4. The composition according to claim 1 , wherein the surfactant is a non-ionic surfactant.
5. The composition according to claim 1 , further comprising a corrosion inhibitor including imidazolines and present in a range of 1 to 5% by weight of the total composition.
6. The composition according to claim 1 , wherein the pour point depressant comprises ethylene/vinyl acetate copolymers.
7. The composition according to claim 1 , further comprising a chelating agent including ethylenediaminetetraacetic acid and present in a range of 1 to 25% by weight of the total composition.
8. The composition according to claim 1 , further comprising a biocide including chlorine/hypochlorite and present in a range of 1 to 5% by weight of the total composition.
9. The composition according to claim 2 , wherein the surfactant and co-surfactant is in a ratio of 20:1 to 1:20.