摘要
为了提高cOz吞吐采油技术在低渗透油藏中的应用效果，从影响CO：吞吐的主要采油机理出发，室内筛选了适合大庆外围葡南油田特低渗透扶余油层的周期注入量、周期注入次数、注入时机、注入压力等影响吞吐效果的主要工程参数，结合现场试验确定了适合CO2吞吐的最佳焖井浸泡时间，指出各油田注入CO2后的浸泡时间应根据浸泡后期油压的变化情况进行调整。优化的吞吐方案设计有效指导了大庆外围低渗透油藏现场开发，3口试验井初期平均单井日增油1．1t，累计增油479t，为进一步提高低渗透油藏水驱后采收率提供了重要依据。
In order to improve the effects of CO2 huff and puff in low-permeability oil reservoirs, from the viewpoint of its main influencing factor on oil-flooding mechanism, the main engineering parameters, such as the cyclic injection rate, injection frequency, injection opportunity, injection pressure and so forth, which influence the effects of the huff and puff in Fuyu extra-low-permeability oil layers of Punan Oilfield in the periphery of Daqing Oilfield, are screened in the laboratory experiments. And furthermore integrating with the oilfield tests, the optimized soaking time of shutting in wells for CO2 huff and puff are determined, finally it is pointed out that the specific soaking times for each different oilfield should be adjusted according to the tubing pressure＇ changes in the later stage of the soakage. The optimized huff-and-puff program design has effectively guided the development of the low-permeability reservoirs in the peripheral Daqing Oilfields, the initial average incremental oil per well is 1.1 t for 3 testing wells, the accumulative oil is up to 479 t, the researches stated above have provided the important evidence for the further enhancing oil recovery after water flooding in the low-permeability reservoirs.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2012年第4期144-148,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家“863”计划“C02驱油提高石油采收率与封存关键技术研究”（2009AA063404）资助.
关键词
低渗透
CO2
吞吐
工程参数
采收率
low permeability
CO2 huff-and-puff
engineering parameter
recovery factor
