The Measurement Of Thermodynamics And Kinetics Parameters Of Viscous Oil During Fire Flooding

Heavy oil resources are quite abundant in China,but there are many difficulties in the exploitation process.Fire flooding is a potential method in oil recovery,however,it cannot be commercialized on a large scale due to its complex mechanism and hard security control.In order to develop a further understanding of the mechanism of in-situ combustion,the combustion characteristics of crude oils from well h83120,well h83121and well h83095 were analyzed based on kinetics experiments.A set of methods for calculating parameters such as combustion amount,combustion ratio,heat release and maximum temperature were designed according to the concentration of reaction products CO and CO₂;An idea of obtaining average molecular formula of pseudo-component was proposed,which is based on a standard curve gained from the combustion amount of n-alkanes,n-hexadecane,n-docosane,n-octacosane,n-tritetradecane,and n-tetradecane,etc.;A microscopic and quantitative understanding of the combustion contribution of different pseudo-components to crude oil was achieved,and the error between the maximum theoretical temperature and the highest temperature obtained from the temperature curve is almost maintained within 50℃;Based on Kinetics experiment,there groups of one-dimensional combustion tube experiments were carried out,in which the object of study was changed from pseudo-component to crude oil.Combined with parameters such as the proportion of pseudo-component in crude oil,the heat release of the three oils was obtained;Finally,the highest temperature in fire flooding was calculated by dividing the tube into five units,and the error is within 50℃compared with the actual maximum temperature detected by thermocouple,as a whole,the result is satisfactory,so,this method can be used to predict the maximum temperature of the formation in the process of actual fire flooding of heavy oil and ensure the safety of fire driving.