Corrosion inhibitor and method of use
This paper discusses a corrosion inhibitor formulation capable of dispersion in aqueous well treating acids. It comprises from 1 to 25 wt % of a metal salt wherein the metal thereof is selected from the group consisting of Cu{sup +}, Sn, Zn, and a Group IIA metal having an atomic number from 12 to 56, a Group IVA metal having an atomic number of 22 or 40, a Group IIIB metal having an atomic number from 13 to 49, a Group VIA metal having an atomic number from 24 to 74, and a Group VB metal having an atomic number from 33 to 83; and mixtures thereof; from 3 to 50 wt% of a quaternary ammonium compound capable of forming a complex with the metal salt; sufficient amount of a highly polar aprotic solvent to dissolve the metal salt and the quaternary ammonium compounds, the concentration of the polar aprotic solvent being between 20 to 90 wt %; and from 1 to 15% of an organic amine dispersant for dispersing the complex of the quaternary ammonium compound and the metal salt in the sell treating acid, the wt % being based on the formulation. This patent also describes a method of acidizing a subterranean formation by injecting a well treating acid solution down pipe into the well. It comprises preparing the corrosion inhibitor formulation of claim 1; dispersing the formulation in the well treating acid solution to provide the solution with at least 0.08 wt % of the metal salt based on the combined weight of the well treating acid and formulation, and injecting the well treating acid solution containing the corrosion inhibitor formulation through the pipe into the formation.
- Assignee:
- Exxon Chemical Patents Inc., Linden, NJ (USA)
- Patent Number(s):
- US 5002673; A
- Application Number:
- PPN: US 7-332629
- OSTI ID:
- 5367211
- Resource Relation:
- Patent File Date: 31 Mar 1989
- Country of Publication:
- United States
- Language:
- English
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