Corrosion Performance of Carbon Steel in CO2 Aqueous Environment Containing Silty Sand with Different Sizes

Abstract

Corrosion performance of carbon steel in CO 2 aqueous environment containing silty sand with different sizes was investigated by immersion tests and electrochemical measurements. Silty sand could form an adsorption layer on steel surface in initial period, and the sand adsorption layer was turned into a mixture film of silty sand with corrosion product in last period. The adsorption layer in 325 mesh condition (large size) had the fewest pores for H 2 CO 3 transport, exhibiting the highest cathodic current inhibition. In spite of little corrosion product, the sand adsorption film formed in 325 mesh condition induced the lowest corrosion rate. For 1000 and 5000 mesh silty sand, the sand adsorption layer had some pores for H 2 CO 3 transport, leading to low cathodic current inhibition and much matrix dissolution. But the adsorption layer for 5000 mesh silty sand (small size) had the largest special surface area to accelerate heterogeneous precipitation of corrosion product FeCO 3 . Therefore, the mixture film in 5000 mesh condition was more compact, exhibiting stronger anodic inhibition and lower corrosion rate than those in 1000 mesh condition.

Effect of Jet Impingement Velocity and Angle on CO2 Erosion–Corrosion with and without Sand for API 5L-X65 Carbon Steel

“…In order to observe the degradation (in terms of coloring and corrosion pattern), pictures were taken for all the tested specimens soon after the test (after surface was cleaned). This pictorial evidence was categorically arranged in order to have a clear visual comparison of the effects of solution pH, impingement angle, velocity, and sand particles [1,23]. Impingement spots surrounded by scars were observed in most of the tested specimens as shown in Table 1.…”

“…In most oil and gas production environments, it is very difficult to avoid the presence of corrosive species and solid particles. Commonly used sand screens in oil and gas production wells cannot filter sand particles below 50 µm [1][2][3]. The flowing fluids also carry CO 2 gas produced by most of the hydrocarbon wells and/or extracted by some processing units.…”

Effect of silty sand on the pre-passivation behaviour of 1Cr steel in a CO2 aqueous environment

“…To date, there has been a little systematic study of pre-passivation behaviour of 1Cr steel in a CO 2 solution containing silty sand. Based on our previous studies, silty sand plays an important role in the formation of corrosion film [15–17]. On the one hand, silty sand can attend the formation of a corrosion film.…”

“…On the one hand, silty sand can attend the formation of a corrosion film. Lu et al [15] researched the corrosion behaviour of X70 steel under the silty sand condition and found that the corrosion film of the steel was composed of silty sand, regardless of different sizes. On the one hand, silty sand can also influence the structure of a corrosion film.…”

A New High-Efficiency Experimental Design for Optimizing Various Flow Velocities Testing in Extremely Aggressive Formation Water

“…In fact, CO 2 corrosion of well tubes is a quite complex process, which involves multiple chemical and electrochemical reactions. Its corrosion mechanism and corrosion rate can be affected by many factors, such as CO 2 partial pressure, temperature, pH and flow velocity [3][4][5][6]. Among the above factors, the flow velocity is the most critical parameter, especially for determining the suitability of the tubes [7,8].…”