Effect of shear stress on the wall of technological pipelines at a gas condensate field on the intensity of carbon dioxide corrosion

Abstract

The object of the study is a section of the gas and gas condensate collection system, consisting of an angle throttle installed on a xmas tree and a well piping located after the angle throttle. The aim of the study is to assess the impact of the flow velocity and wall shear stress (WSS) on the carbon dioxide corrosion rate in the area of interest and to come up with substantiated recommendations for the rational operation of the angle throttle in order to reduce the corrosion intensity.
 In the course of solving this problem, a technique was developed and subsequently applied to assess the influence of various factors on the rate of carbon dioxide corrosion. The technique is based on a sequence of different modeling methods: modeling the phase states of the extracted product, three-dimensional (solid) modeling of the investigated section, hydrodynamic flow modeling of the extracted product using the finite volume method, etc. The developed technique has broad possibilities for visualization of the obtained results, which allow identifying the sections most susceptible to the effects of carbon dioxide corrosion.
 The article shows that the average flow velocity and its local values are not the factors by which it is possible to predict the occurrence of carbon dioxide corrosion in the pipeline section after the angle throttle. The paper proves that WSS has prevailing effect on the corrosion intensity in the section after the angle choke. The zones of corrosion localization predicted according to the technique are compared with the real picture of corrosion propagation on the inner surface of the pipe, as a result of which recommendations for the rational operation of the angle throttle are formed.

Comparative Study of Empirical Correlations and Equations of State Effectiveness for Compressibility Factor of Natural Gas Determination

“…In recent years, more and more natural gas deposits with high CO 2 content have been found worldwide (Gachuz-Muro, Sanchez-Bujanos, Castro-Herrera, Rodriguez-Pimentel, 2011; Jokhio, Tiab Escobar, 2001). Modeling the development and operation of such facilities requires special knowledge due to the aggressiveness of carbon dioxide under conditions characteristic for processes occurring under high pressure and temperature (Koriakin, 2018;Nešić, 2011), as well as in plumes and equipment of surface facilities (Ponomarev Yusupov, 2020). The presence of CO 2 in such objects can significantly affect the value of the compressibility factor.…”

The role of multi-phase metal content in corrosion and premature failure mitigation of steel equipment in oil refiniers. Part 1

“…Corrosion requires three main pillars together and at the same time to initiate and grow: corrosive components (CO 2 , H 2 S, Cl-, etc. ), electron-consuming components (components for consuming corrosion electrons) (depolarizing components at the cathodic areas), electron-conducting components (components for electronic conduction from corroded (anodic) areas to cathodic areas that consume these electrons by depolarizers) [6,7]. The absence of either of them leads directly to slowing down the corrosion process and even stopping it completely.…”

The Study of Metal Corrosion Resistance near Weld Joints When Erecting Building and Structures Composed of Precast Structures

“…4-5 percent of the national income of industrially developed countries, and not less than 10 percent of smelted metal, that is, 20 million tons per year. Practical engineers undertake maximum necessary measures for the corrosion protection of process equipment and engineering structures [3][4][5][6]. Article [3] examines the corrosion of underground pipelines and suggests new ways to protect against it.…”

“…Article [3] examines the corrosion of underground pipelines and suggests new ways to protect against it. In work [4], the effect of shear stress on the wall of technological pipelines on the intensity of carbon dioxide corrosion is studied. Articles [5,6] discuss the chemical and thermal treatment of steel in low-melting solutions.…”