Study On The Decline Law Of Type ? And ? Reservoirs In Shallow Super Heavy Oil In Xinjiang

The development rules of common heavy oil reservoirs and extra-heavy oil reservoirs have formed some technical consensus at home and abroad.Due to the complicated and diverse geological conditions and development conditions of super-heavy oil reservoirs,the development time is short,and there are many development laws.Certainty.In order to study the production decline law of different development modes of different types of super heavy oil reservoirs,on the one hand,by selecting typical units,the yields of different development methods such as steam stimulation,steam flooding and SAGD for different types of super heavy oil(straight and horizontal wells)The law of diminishing and change is analyzed.On the other hand,numerical simulation technology is applied.Through the establishment of the mechanism model,the law of production decline of super heavy oil steam stimulation is analyzed.Based on the analysis of the actual development unit and the numerical simulation results of the theoretical model,the factors affecting the thermal recovery development of the super heavy oil reservoir are determined.Through the study of the influencing factors of the law of production decline,the crude oil viscosity,effective thickness and steam dryness are the main factors affecting the initial decline rate,and the empirical relationship between different influencing factors on the initial decline rate is established.The multivariate linear regression method was used to establish a prediction model for the steam recovery cycle and annual output decline rate of different well types in super heavy oil,and the typical unit development data was used for testing.The relative error was within ±5.0%,reflecting the established decrement.The regular model can better predict the initial steam decline cycle and annual output decline rate of different well types in super heavy oil.According to the divergence law model,a standard chart of the decline rate of different types of super-heavy oil steam stimulation cycle and annual production decline period is established,which can effectively check the declining of any different types of super-heavy oil steam stimulation cycle and annual production decline period.rate.The research results of the thesis have achieved good application results in the practice of the mine.