Reservoir Engineering Design Of CO₂ Injection In Hailar Oilfield

In recent years,the emerging technology of oil displacement by carbon dioxide injection was extended in the exploration of low permeability reservoirs.Compared to other technology,the technology of oil displacement by carbon dioxide injection has outstanding advantages about broad scope of application,low cost of oil displacement,enhanced oil recovery,and has effect of energy-saving and emission-reduction.The technology is receiving more and more attentions in the field of reservoir development at present,and has good prospect of application.From overseas,most of oil fields has successfully carried out a large scale injection of carbon dioxide flooding, and achieved good results,which proved that the carbon dioxide driven has a high success rate,low risk characteristics. By using technical indicators and economic indicators to measure,carbon dioxide flooding is one of the most promising methods in the enhanced oil recovery.In China,the research of carbon dioxide flooding method started late,and is still in the exploratory stage.This paper carries on the analysis of development situation about the reservoirs which is driven by carbon dioxide the entire world through the study about research and application of the technology of oil displacement by carbon dioxide injection both at home and aboard.We know that the technology of oil displacement by carbon dioxide injection apply to more extensive range of reservoir parameters,and has been the one of main technology of enhanced oil recovery in future.First,we should confirm that whether the experimental block is able to develop by the technology of oil displacement by carbon dioxide injection through researching Geologic characteristics and reservoir types,and real situation of the experimental block.Secondly,we introduce the principle of the technology of oil displacement by carbon dioxide injection,and confirm the minimum miscibility pressure of the experimental block by the experiment.At last,the effect of development about the experimental block after injected gas proved out that the exploitive status of reservoir got better and the oil production of all wells increased,mobility ratio had improved effectively and swept area of driving also expanded,reduce the viscosity of crude oil.The results indicate that the experimental block is suitable for development by the technology of oil displacement by carbon dioxide injection.