Evaluation Of Surfactant Energy Increasing Effect In Low Permeability Reservoir

After the first and second recovery of low permeability reservoirs,the following problems will occur: 1)in the early stage of development,the production per well is high,but the decline is rapid and the water breakthrough time is short;2)the pressure is difficult to maintain,the local water flooding contradiction is serious,and the water level in the block increases rapidly.At the same time,low permeability reservoirs have the characteristics of low porosity and low permeability,and most of them have the problem of high water injection pressure,so it is difficult to see the effect of water injection in oil Wells.Although all of them are fractured,the above problems have not been solved.For low permeability reservoir,generally USES the development of surfactant stimulation,so in this paper,on the basis of the research literature,according to the stratigraphic profiles,putaohua oilfield fracturing-surfactant can increase the coupling model is set up,formation pressure and instantaneous flow injection well,the relation between research on surfactant can increase calculation method,finally through the indoor experiment study feasibility of surfactant can increase effect of the indoor experimental study.It provides theoretical basis and technical guidance for the further development of the oil layer of grape flower.The results show that the relationship between injection pressure and instantaneous flow is linear.The permeability and injection pressure satisfy the formula: P injection =34.69 k-0.208,and the corresponding graph of injection pressure and instantaneous flow is established.According to the sensitivity analysis,PV injection had the greatest influence on the pressure increase,followed by well spacing and average permeability,and the permeability level difference,surfactant concentration and oil saturation had less influence on the pressure increase.The high precision model of pressure rise prediction was established and the program of reasonable injection volume was programmed.The relative error was 7.24%.