Feasibility Research Of Heavy Oil Recovery With Steam Huff-puff Followed By Steam Flooding

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,with the cyclic steam injection proceeding,the production decline rapidly and the formation pressure has shap fallen.Given the current development situation and focus on long-term oilfield development,it is extremely important to perform research and experimental on thermal recovery development mode transformation for heavy oil.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 flooding was studied in this paper,including steam quality,steam injection rate,production-injection ratio,steam injection temperature,well pattern,the timing for steam flooding,shutting-opening ratio.Based on the results analysis,multiple parameters optimization was carried out by using orthogonal design,including steam quality,steam injection rate,production-injection ratio,steam injection temperature,a best scheme was concluded,which has some guiding significance to improve the development effect.