Laboratory study on efficiency of three calcium carbonate scale inhibitors in the presence of EOR chemicals
| Autor: | Hassan A. Al-Ajwad, Shouwen Shen, Faez Al-Dawood, Qiwei Wang, Waleed Al-Nasser, Tawfiq Al-Shafai, Hameed Al-Badairy, Feng Liang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
business.product_category
Materials science Energy Engineering and Power Technology 02 engineering and technology chemistry.chemical_compound 020401 chemical engineering Geochemistry and Petrology lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction Bottle 0204 chemical engineering lcsh:Petroleum refining. Petroleum products chemistry.chemical_classification Scale (chemistry) System pressure Geology Polymer 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Water composition Fuel Technology Calcium carbonate chemistry Chemical engineering lcsh:TP690-692.5 lcsh:TA703-712 Enhanced oil recovery 0210 nano-technology business |
| Zdroj: | Petroleum, Vol 4, Iss 4, Pp 375-384 (2018) |
| ISSN: | 2405-6561 |
| Popis: | Chemical flooding has been widely used in the oil industry since the 1980s for enhanced oil recovery (EOR) process. Previous studies have shown that the effectiveness of calcium carbonate scale inhibitors is affected by many factors, such as water composition, system pressure, temperature, production rates, pH etc. The breakthrough of the EOR chemicals in the production well could also affect scale formation process and interfere with the scale treatment program as well. However, the studies on the impacts of injected EOR chemicals to scale inhibitor performances are very limited. This paper presents the comprehensive laboratory study on the impacts of the EOR chemicals on CaCO3 scale formation and prevention using static bottle and dynamic tube blocking methods. The EOR chemicals used in this study are a combination of surfactants and polymers. Three different types of inhibitors were evaluated: tri-phosphonate, penta-phosphonate, and polyacrylate based chemicals. Inhibition (%) from the bottle test and minimum effective dose (MED) based on the tube blocking method were determined for each inhibitor at 160 °F. Scale precipitates from the bottle tests were also characterized for morphology and polymorphs using environmental scanning electron (ESEM) and X-ray diffraction (XRD) techniques. Results suggest that the performance of scale inhibitors could be substantially affected by the EOR chemicals. In dynamic tube blocking tests, the MED values of inhibitors were increased roughly 10 times with the EOR chemicals. The static bottle tests showed considerable changes under the test conditions. The impact of EOR chemicals were also demonstrated by the remarkable ranges of crystal morphologies, changing from simple aragonite columns to nanorod, distorted spheroid, and flower-like superstructure in the presence of EOR chemicals and inhibitors. Keywords: Calcium carbonate, Scaling, Inhibitor, Chemical flooding, Enhanced oil recovery |
| Databáze: | OpenAIRE |
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