The Thin Interbedded Ordinary Heavy Oil Development Change From Water Flooding To Thermal Recovery Research In The Fourth Member Of Shahejie Formation Of Cao 13 In Lean Oilfield

The fourth member of Shahejie formation of Cao 13 is located in the west of Lean oilfield,there are 30 small vertical layers,layer thickness,reservoir sensitivity,viscosity differences,as ambient medium porosity and medium permeability lithologic structural thin layer of common heavy oil reservoir.The early development of water flooding in this unit can effectively alleviate the decline of unit.After 1992,the development level is low due to the problems of the well condition are prominent,the viscosity of the crude oil after the light oil production is higher,the development mode is not applicable and so on.I In order to improve the development level of the unit and increase the recovery ratio of the oil reservoir,the conversion method must be studied.According to the revised passing well data structure,sedimentary and reservoir geological characteristics,distribution of remaining oil unit to lay the foundation;to evaluate the unit development history,development status and development effect,find out the main problem of unit existence;combining with the geological data,oil well production and injection dynamic model,based on historical fitting revised data material parameters and the evaluation of residual potential unit;application in the simulation model,determine the reasonable development mode,and the unit spacing,fracturing parameters,heat injection production parameters and steam flooding parameters were studied to determine the development of reasonable boundaries.Through the research of this paper,the direction of unit adjustment is pointed out,the recovery ratio of oil reservoir is improved,and the utilization ratio of resources is improved.At the same time,the economic and technical policy limits of the thermal recovery of water flooding after the water flooding in the thick interbedded reservoir are determined so as to effectively guide the development of similar reservoirs.