How Does Fluid Flow Affect Performance of CO2 Corrosion Inhibitors?

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe performance of three CO 2 corrosion inhibitor products was tested in an impinging jet apparatus. The test conditions were 40 o C, 1 bar CO 2 , pH 5, 3 % NaCl. The O 2 concentration was deliberately held within two different ranges: 2-4 ppb, and 10-30 ppb. The jet flow velocity was varied in the range 0.5-20 m/s. The flow velocity did not affect the inhibitor performance with the O 2 concentration in the lower range. Flow dependent O 2 corrosion was observed in the higher concentration range.

The incidence of chromium-rich corrosion products on the efficiency of an imidazoline-based inhibitor used for CO2 corrosion prevention

“…This effect may be linked to their uniform microstructure that consists of an alloyed Fe matrix with a homogeneous distribution of fine carbides. Although it is known that cathodic reactions on cementite are poorly inhibited in CO 2 corrosion [17,18,23], it was proposed elsewhere [22] that imidazoline molecules can be bounded to Fe 3 C through Lewis acid-base interactions. Therefore, as chromium alloyed Fe matrix is a deficient substrate for inhibitor adsorption, disperse exposed carbides may act as anchor sites, assisting in the inhibitor film formation and improving film properties and coverage.…”

“…Even though SAE 1018 constitutes the most common substrate used for inhibitor performance tests, some articles in literature account for considerable differences in the efficiency of individual inhibitors on different steels [17,18].…”

Production of Wet Natural Gas Containing Corrosive Components: Four Case Histories

“…Therefore, a re-evaluation of inhibitors making use of a high-velocity flow loop was conducted (Elhofer 1996;Oberndorfer et al 1998). As the literature (Gulbrandsen et al 2005) indicates, flow velocities up to 20 m/sec do not cause any measurable effect on inhibition, as long as CO 2 does not contribute significantly to the corrosion rate. The flow-loop tests conducted in the OMV laboratory came to the same conclusion, showing that the inhibitor that had already been in use in the Hoeflein gas field also had the best performance even at high velocities up to 20 m/sec.…”

Synthesis and Testing of Monoethylene Glycol Carbon Quantum Dots for Inhibition of Hydrates in CO2 Sequestration

“…Glycols are commonly used as a combined hydrate and corrosion inhibitor in wet gas pipelines (Troll pipeline). 15 Moreover, glycol presents desired properties such as being nonbioaccumulative, degradable, and surface-inactive and having low toxicity.…”

“…In this research work, monoethylene glycol (MEG) is selected for modifying and enhancing the inhibition efficiency. Glycols are commonly used as a combined hydrate and corrosion inhibitor in wet gas pipelines (Troll pipeline) . Moreover, glycol presents desired properties such as being nonbioaccumulative, degradable, and surface-inactive and having low toxicity.…”