СНИЖЕНИЕ СОЛЕОТЛОЖЕНИЯ В ОБОРУДОВАНИИ НЕФТЕПРОМЫСЛОВ ПУТЕМ УПРАВЛЕНИЯ ЭЛЕКТРОХИМИЧЕСКИМИ ПАРАМЕТРАМИ СРЕД

Abstract

Background One of the causes of oilfield equipment damages is corrosive media contacting with the inner surface of equipment. Medium corrosiveness is due to the presence of salt ions which are directly involved in corrosion processes and cause nonorganic salt deposition on the equipment surfaces. Salt depositions often bring to reduction of the pipeline working opening and contamination of the transported/processed medium. Removal of the active salt ions from the working medium, or their inactivation, reduces significantly the rate of equipment corrosion and the amount of salt depositions. Aims and Objectives To develop the method for lowering the amount of the active ions of salts so that to prevent corrosion damage of equipment and reduce salt deposition. The method must ensure the required effective removal of the active ions at low capital and working costs, and it must not contaminate the working medium. Methods A model of formation water and a device for metering electrochemical parameters of liquid media were used for conducting laboratory study. Content of calcium ions was determined by complexometric method. Redox potential and pH values were measured by pH-meter. Results Studies have shown that the developed method can be used to change the quantity of the active salt ions in the working medium. Adding to the working medium of anolyte and catholyte produced in the device changing the electrochemical parameters of liquid media, promotes electrochemical reactions, as a result of which the active calcium ions causing salt deposition are bonded as poorly soluble compounds. Thus obtained salt crystals are not capable to deposit on the walls of the metallic equipment because of the low energy of activation, and are removed by the fluid stream.