Experiment Study And Parameter Optimization Of Steam Stimulation Assisted With CO₂ And Viscosity Reducer

The heavy oil resources in Henan oilfield are abundant,and the reserves of super heavy oil are high.At present,the on-site industrial exploitation of ultra-heavy oil with very high viscosity is mainly based on the traditional high-temperature steam stimulation method,but the recovery of ultra-heavy oil by conventional steam stimulation technology is low.In order to improve the effect of steam stimulation in ultra-heavy oil reservoirs,it is necessary to optimize the parameters of carbon dioxide and viscosity reducer assisted steam stimulation through indoor oil displacement experiments,and optimize the parameters accordingly.Based on the study of the ultra-heavy oil properties of Block A in Henan Oilfield,the four components of super heavy oil and the salinity of formation water were experimentally determined,and the relationship between viscosity and density and temperature was obtained.According to the experimental study of the properties of super heavy oil-carbon dioxide system at different pressures and temperatures on the solubility of carbon dioxide in super heavy oil,and the effect of the solubility of carbon dioxide in super heavy oil on its viscosity,studies have shown that carbon dioxide is super thick.The solubility in the oil decreases with increasing temperature,and the viscosity of the super heavy oil decreases as the solubility in the carbon dioxide super heavy oil increases.Through the physical experimental simulation method using high temperature steam,steam+CO₂,steam+viscosity reducer,steam+CO₂+viscosity reducer four experimental research shows that in the super heavy oil injection steam injection while adding carbon dioxide and viscosity reducer,you can On the basis of steam thermal viscosity reduction,the viscosity of the super heavy oil is further reduced to improve the flow capacity of the super heavy oil,thereby further developing the effect of steam stimulation,and greatly improving the oil recovery rate.Therefore,the parameters such as the injection mode and injection amount of carbon dioxide and viscosity reducer are studied and optimized,which provides technical guidance for the practical application of the super heavy oil exploitation site in Henan Oilfield.