Application of carbon dioxide in enhanced oil recovery
At present time energy usage at every point of planet Earth constantly growing. The main sources of fuel are of course oil products, as well as gas. However, during oil and gas combustion a huge amount of carbon dioxide is released into the atmosphere, which negatively affects the ecological situation throughout the world. Numerous studies and tests are estimated that carbon dioxide can be using as an agent for enhanced oil recovery, injection of CO2 into the reservoir also solves problem of its collection and utilization. For example, some properties are given, such as the dependence of the solubility in water on the pressure and temperature, both of carbon dioxide and its mixture with oil. This article discusses some basic ways of using carbon dioxide for enhanced oil recovery and the specific features of the methods described. Also, the conditions for the effective use of carbon dioxide to improve the efficiency of oil production, in particular in fields with hard-to-recover reserves, namely hight-viscosity oil, are considered. Negative aspects of the use of carbon dioxide for increasing oil recovery of reservoirs, as well as problems that arise during the development of seams by these methods are noted. Attention is paid to enhanced oil recovery technologies based on the use of carbon dioxide in the supercritical state. Mentioned are modern technologies that make it possible to produce carbon dioxide. Examples of the use of carbon dioxide in deposits are given, as well as the results of the tests given. Conclusions are drawn about the need for further research in the direction of supercritical state of substances, in particular carbon dioxide.