The Research On Parameters Optimization And Effect Prediction In J17 Heavy Oil Reservoir

With the reduction of conventional oil reserves and the increasing demands of oil,more and more countries have paid attention to the heavy oil,which has great exploration potential and broad prospects for development in the new century.As a mature technology,cyclic steam has been used widely in many oil fields of our country because of its simple process and low cost.Jinjia Oilfield which located within Huantai County,Shandong Province is an ordinary heavy oil reservoir.Cyclic steam injection of horizontal well was used in Ed34 during the process of steam injection since May 2010 and achieved some effects.However,some problems emerged due to the lack of the techniques and theory,such as lack of fluid supply,the fast production decline.Therefore,it is necessary to find out how the various types of geological and technological parameters influence the result of cyclic steam injection,thereby making the feasible optimization plan for the parameters of cyclic steam injection and further improving the oil recovery.Through the analysis of the status of the reservoir,the law of diminishing was studied in this paper and some suggests were provided.Based on the actual oilfield geological data,the numerical model was established.The charateristics of the current distribution of the remaining oil was analyzed on the basis of complete history matching,and the steam stimulation heating radius of a typical injection well.Meanwhile,the influence rules of parameters on the steam stimulation was studied in this paper,including reservoir depth,reservoir thickness,permeability,porosity,initial oil saturation,oil viscosity,steam quality,steam injection rate,steam injection pressure,steam injection volume,soak time,well pattern,well length,well spacing and the distance between horizontal well and reservoir top.Based on the results analysis,multiple parameters optimization was carried out by using orthogonal design,including steam injection strength,steam injection rate,steam quality,soak time and steam injection pressure,a best scheme was concluded,which has some guiding significance to improve the steam stimulation effect.