低渗透油藏转变注水开发方式研究——以大港油田孔南GD6X1区块为例  

Research on transformation of waterflooding development mode in low permeability oil reservoirs-Taking GD6X1 Block of Kongnan in Dagang Oilfield as an example

作　　者：吴忠宝[1] 李莉[1] 张家良 阎逸群 王俊文[1] 张原 WU Zhongbao;LI Li;ZHANG Jialiang;YAN Yiqun;WANG Junwen;ZHANG Yuan(PetroChina Research Institute of Petroleum Exploration&Development,Beijing City,100083,China;Explortion and Production Research Institute,CNPC Dangang Oilfield Company,Tianjin City,300270,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大港油田公司勘探开发研究院,天津300270

出　　处：《油气地质与采收率》2020年第5期105-111,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“低渗、特低渗复杂油藏规模有效动用关键技术”(2017ZX05013-006)。

摘　　要：低渗透油藏常规注水开发生产井受效程度低、低产低液、经济效益差,传统水驱开发技术已无法适应低渗透油藏经济有效开发的要求,而借鉴致密油体积压裂后衰竭开采的开发方式,虽然可提高单井初期产能,但由于低渗透油藏砂体规模小、地层压力系数低和原油黏度高、气油比低等特点,仍存在产量递减快、累积产油量和采收率低等问题,因此迫切需要调整开发思路,转变注水开发方式。为此,提出了低渗透油藏由径向驱替向线性驱替转变,由连续注水向注水吞吐、异步注采和油水井互换等渗吸采油方式转变,由缩小井距提高水驱动用储量向体积改造提高单井缝控储量转变的3个转变注水开发方式的新思想;创建了全新的“体积压裂+有效驱替+渗吸采油”开发模式,并应用于大港油田孔南GD6X1区块,初步实施效果显著。When the low permeability reservoirs are developed with conventional waterflooding technology,producers will have low efficiency,low oil and liquid production,and poor economic benefits.Traditional water-flooding development technology cannot meet the requirements of economic and effective development of low permeability reservoirs.Although the development mode of depletion recovery after volume fracturing of tight oil can improve the initial productivity of single well,due to the characteristics of small sand body,low formation pressure coefficient,high viscosity of crude oil and low gas oil ratio,there are still defects of rapid production decline,low cumulative oil production and low recovery factor.There is an urgent need to adjust development ideas and change waterflooding development mode.Therefore,this paper innovatively puts forward three development ideas for low permeability reservoirs,namely,the transformation from radial displacement to linear displacement,transformation from continuous water injection to imbibition oil recovery such as asynchronous injection and production,water injection huff and puff,producer-injector exchange,and transformation from increasing producing reserves by shortening well distance of producer and injector to increasing fracture-controlled reserve by volume fracturing.A brand-new development model of“volume fracturing+effective displacement+imbibition oil recovery”is established and applied to GD6X1 Block in Dagang Oilfield.The preliminary implementation effect is remarkable.

关 键 词：低渗透 转变开发方式 体积压裂 渗吸采油 有效驱替 裂缝网络 

分 类 号：TE348[石油与天然气工程—油气田开发工程]