Laboratory Experiment And Parameter Optimization Of Air Foam Flooding In Jilin Oilfield

Aiming at the problems of high water injection pressure and low oil recovery in the late stage of water flooding in block 208 of Jilin oilfield,laboratory experiment and parameter optimization of air foam flooding in this block are carried out.(1)The performance of foaming agent used in the block is evaluated through laboratory experiments.The results show that the foaming agent has good temperature resistance and salt tolerance.(2)The experiment of natural core displacement in this block is made up of the single tube and the double pipe.The former part includes single water flooding,air foam flooding,gas flooding after water displacement,air foam flooding after water displacement and alternate displacement of water and gas;The results show that the displacement efficiency of air foam flooding is 4.5% higher than that of water flooding.The displacement efficiency of gas flooding after water displacement is increased by about 13%,and the displacement efficiency of air foam flooding after water displacement is increased by about 17%.The alternate displacement of water and gas is helpful to improve the displacement efficiency.The later part includes dual water flooding,gas flooding,air foam flooding and air foam flooding after water displacement.The results show that the difference of oil recovery in water flooding between high permeability formation and low permeability formation is 17%,that the difference of oil recovery in gas flooding between high permeability formation and low permeability formation is 26% and that the difference of oil recovery in air foam flooding between high permeability formation and low permeability formation is 13%.Air foam flooding after water displacement can effectively improve oil recovery,low permeability layer increased by 20% and high permeability layer increased by 18%.(3)At the end of this paper,the parameter optimization of numerical simulation of air foam flooding is carried out.The optimized results are as follows: the concentration of foaming agent 0.75%,the gas liquid ratio 2,the maximum injection pressure difference 20 MPa,the size of the injected foam slug 0.1PV.These results provide a certain degree of reference for the actual development of the mine,and provide methods and ideas for the study of similar issues.