Study On Optimal Design Of Oil Displacement Profile Control System In Strong Heterogeneous Reservoir

Polymer flooding technology has been successfully applied in offshore reservoirs.However,under the condition of heterogeneous reservoir,the ability of the polymer to improve the profile is not enough to weaken the strong heterogeneity.In addition,the sea oil reservoir has the advantages of single well controlled reserves,many control layers,and the limitation of the space platform,so that the offshore oil field cannot be used as a layered mining system in the onshore oil field.Therefore,it is necessary to carry out the research on the improvement of the reservoir by means of offshore displacement control technology under the condition of strong heterogeneity reservoir.This paper based on the research of gel formula and gelling properties,through static experiments,the effects of gel components on the gelling performance,combining polymer system and reservoir compatibility relation is known,then by injecting and sealing tests were conducted to verify;through the water absorption of the microsphere expansion characteristics with the goal of reservoir evaluation,the relationship between porosity and permeability,injection and plugging experiment.Through the combination of the different difference conditions of the profile control system and the known polymer,it is clear that the application of the two types of displacement control system,as well as the optimization of the injection method.The final conclusion: in ratio 4 and below reservoir,the role of polymer alone could adjust the entry profile,in reservoir of more than grade 4,the polymer alone cannot effectively adjust the input profile,and gel flooding ability in microspheres.In the injection mode,the alternating order of polymer and gel is the first injection of gel and then the polymer.In this experiment,under the ratio 4 conditions,use the method of polymer injection;Under the ratio 10 conditions,the development of gel / polymer alternate injection can increase by 16.7%;under the ratio 10 conditions,the use of gel / polymer mining method is 20.3% higher than that of continuous polymer injection.