DEACTIVATION OF OIL AND GAS EQUIPMENT CONTAMINATED WITH SALTS OF RADIOACTIVE ISOTOPES
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2018, Vol 1, Issue 108
Abstract
Purpose. To develop an environmentally safe and cost-effective method for cleaning oilfield equipment from radio-active sediments and the technology for its implementation. To justify the choice of the chemical method of decontamination, which helps to prevent danger to life and health of the population in the area of the research object influence. Methodology. Decontamination in conditions of surface contamination occurs in the water environment, as well as a result of mechanical action. Deactivation of impurities located in the depth of the surface is achieved by removing the upper contaminated layer together with the radioactive substances in it. Modeling using the GEMS software complex of physical and chemical means for cleaning industrial equipment has been carried out. Hydrochloric acid solutions were used to leach radium and thorium from the surfaces of the equipment. Weak radioactive waste ("weak" group) - pipes with mineral composition of tumors: iron hydroxides (mainly goethite) - about 97%, barite - 2.5%, calcite and halite - together 0.5% were selected. Results. Mathematical modeling of physical and chemical means for cleaning industrial equipment made it possible to clarify that the passage of a solution of HCl with a concentration of about 7% at a temperature of 25 ° C leads to complete thorium leaching into the solution, considerable dissolution of the goethite, and a partial (about 10%) extraction of radium. Practical value. The decontamination of tubing carried out in this way on the territory of development of deposits allowed to ensure radiation safety for personnel. Pipes cleaned with acidic reagent treatment do not pose a danger to the public and can be used for further disposal. Mathematical modeling of physicochemical methods for cleaning industrial equipment made it possible to clarify that the passage of a solution of HC1 with a concentration of about 7% at a temperature of 25 ° C leads to a complete leaching of thorium into the solution, considerable dissolution of the goethite, and a partial (about 10%) extraction radium. Simulation of cleaning equipment with H2SiF6 made it possible to clarify that at a thickness of the crust of tumors on the walls of pipes of 1 mm even at low concentrations of acid (0.1-2%), practically all of Ra is converted to an aqueous solution. References 17, tables 3, figures 2.
Authors and Affiliations
L. Plyatsuk, O. Burla, I. Ablieieva, R. Vaskin
Keywords
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- EP ID EP659499
- DOI 10.30929/1995-0519.2018.1.109-116
- Views 72
- Downloads 0
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