Corrosion Inhibition of Tubing Steel during Acidization of Oil and Gas Wells

Abstract EN

Acidization is an oil reservoir stimulation technique for increasing oil well productivity.

Hydrochloric acid is used in oil and gas production to stimulate the formation.

The acid treatment occurs through N80 steel tubes.

The process requires a high degree of corrosion inhibition of tubing material (N80 steel).

In the present investigation effect of synthesized amino acid compounds, namely, acetamidoleucine (AAL) and benzamidoleucine (BAL) as corrosion inhibitors for N80 steel in 15% HCl solution was studied by polarization, AC impedance (EIS), and weight loss measurements.

It was found that both the inhibitors were effective inhibitors and their inhibition efficiency was significantly increased with increasing concentration of inhibitors.

Polarization curves revealed that the studied inhibitors represent mixed type inhibitors.

AC impedance studies revealed that charge transfer resistance increases and double layer capacitance decreases in presence of inhibitors.

Adsorption of inhibitors at the surface of N80 steel was found to obey Langmuir isotherm.