Laboratory Researches On Gas Injection Of YuShuLin Oil Field

In this PaPer,laboratory researches on gasinjection of YuShuLin Oil Field are studied for the Practical Problem that occurred during the development of reservoirs,which are accomPlished on the base of Predecessors'work.The main research results are got ten as follows:1,I had consulted a large number of Chinese and foreign documents. These results of my researching work have extensive suitability to low permeability reservoirs.All analysis methods and the experimental techniques have been applied to rule, the theory and actual unified Some foundational and the practical conclusions are obtained.2,Basis to low permeate large-scale Yushuin oil field of Daqing ,there be a series of experment researches CO₂ displacement in fine tube, in long core ,in formular simulation and in microcosmic experiments , A fter all of those , a conclusion can be drawn that CO₂ miscible flooding can be developed in reservoir condition ,the experimented MMP(minimum miscible pressure) of CO₂ and natural gas are obtained by laboratory tests.The enhanced oil recoveries under different pressures have been gained of low permeability oil reservoirs.3,Through long core experiments some conclusions are obtained as follows:â‘ CO₂ flooding can improve. The oil recovery rate by large margin The influences of water on CO₂ miscible flooding can be reduce greatly if there is at last one 0.1HCPV gas during water alternate gas injection. This way can raise recovery ratio to be most heavy.â‘¡Aconclusion can be drawn that natural gas immiscible flooding can be developed in reservoir condition;oil recovery ratio will be advanced greatly.The important factor of natural gas flooding in Yushulin oil filed is the choice of mode bulk of natural gas flooding and pressure of flooding and so on.â‘¢The best do sage of CO₂ injection in oil field of Daqing is 0.3⁰.4HCPV. Gas injection is good in prophase and water injection is reasonable in anaphase,The influence on oil recovery is severe if CO₂ gas intermingles N2, but tiny if neutral gas intermingled.