摘要
氮气泡沫调驱技术因具有调整产液剖面、降低含水率等优势而被广泛用于调驱和控水等提高采收率措施中。为进一步明确氮气泡沫调驱体系在中孔中渗透储层的适用界限,并确定最佳调驱时机,采用室内实验方法,对强化氮气泡沫在不同渗透率级差岩心中的调驱效果进行评价,分析岩心非均质性及调驱时机对调驱效果的影响。实验结果表明:针对中孔中渗透储层,经强化氮气泡沫调驱后,渗透率级差为2—6时控水增油效果较好,采出程度可在水驱基础上提高18%以上,其中渗透率级差为6时提高采出程度最高,可达20.0%;渗透率级差约为3时产液剖面得到最佳改善,控制分流率可达0.25 PV;采出液含水率为80%时为最佳泡沫调驱时机。
The nitrogen foam profile control and displacement technique is widely used in oil recovery,water control,and other enhanced oil recovery measures because of its characteristics of adjusting the fluid production profile and reducing the water cut.In order to furtherly clarify the applicable limit of nitrogen foam profile control and flooding system in medium porosity and medium permeability reservoir and to determine the best flooding time,the effect of the enhanced nitrogen foam on cores with various permeability ratios was evaluated,and the influence of heterogeneity and flooding time on profile control and displacement of the nitrogen foam system was analyzed by laboratory experiments.The experimental results show that for the medium porosity and medium permeability reservoir,the system has a better effect on water control and stable oil production,and the recovery efficiency by nitrogen foam flooding can be increased by more than 18%compared with that by water flooding when the permeability ratio is in the range of 2-6;among them,the recovery efficiency is the highest(20.0%)when the permeability ratio is 6.The production profile will be improved when the permeability ratio is about 3,and the diversion rate can be effectively controlled at 0.25 PV.When the water cut of the produced fluid is 80%,it is the best time for nitrogen foam flooding.The experimental results of enhanced nitrogen foam flooding for the reservoir adaptability can provide guidance for the optimization of water control and oil production increase measures and the design of foam flooding scheme in oilfield.
作者
赵凤兰
王鹏
侯吉瑞
李文峰
刘怀珠
郝宏达
付忠凤
ZHAO Fenglan;WANG Peng;HOU Jirui;LI Wenfeng;LIU Huaizhu;HAO Hongda;FU Zhongfeng(Research Institute of Enhanced Oil Recovery,China University of Petroleum(Beijing),Beijing City,102249,China;BasicTheory Laboratory of Improved Oil Recovery in Low Permeability Oil Fields,Tertiary Oil Recovery Key Laboratory,CNPC,Beijing City,102249,China;Key Laboratory of Greenhouse Gas Sequestration and Petroleum Exploitation,Beijing City,102249,China;Research Institute of Drilling and Production Technology,PetroChina Jidong Oilfield Company,Tangshan City,Hebei Province,063004,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2019年第2期94-100,共7页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"低渗致密油藏高效提高采收率新技术"(2016ZX05009-004)和"海外重点油气田开发钻采关键技术"(2017ZX05032-004)
关键词
强化氮气泡沫
中孔中渗透储层
提高采收率
调驱时机
剖面改善
enhanced nitrogen foam
medium porosity and medium permeability reservoir
EOR
profile control and flooding time
profile improvement
