Evaluation of corrosion inhibitor for low-pH ammonium nitrate-methanol completion fluid

Document Type

Conference Proceeding

Publication Date

12-1-1991

Abstract

A specially formulated completion fluid, low pH ammonium nitrate-methanol-water mixture (ANM) compatible with argillaceous and calcareous Adriatic Sea sandstone formations appeared to be very corrosive for steel wellbore equipment. More than twelve commercially available as well as some originally formulated chemical additives were laboratory tested at room temperature using weight loss and electrochemical methods in order to find out the effective corrosion inhibitor for this well completion fluid. Two inhibitors; first, commercially available, organic, amine base (OA), and other, originally formulated, inorganic, ammonium dihydrogen phosphate base (IA), showed effective protection of carbon steel 1010 in contact with ANM fluid (corrosion rate was less than 5 mpy). Both selected corrosion inhibitors did not exhibit any additional rock permeability impairment during fluid-rock compatibility flow tests if ANM fluid was filtered before injection into the core samples. For inorganic inhibitor IB, additional filtration of inhibited fluid is not required.

Publication Source (Journal or Book title)

SPE Asia Pacific Conference

First Page

541

Last Page

552

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