Taking a low-permeability reservoir as an example,the remaining oil distribution law and development technology optimization scheme of the reservoir were studied by using thin-section fluorescence analysis and microscopic simulation analysis methods.The results showed that the remaining oil types were mainly pore-throat filling type,throat stagnation type,dispersed oil droplet type and corner type,and the overall distribution of remaining oil was similar.The formation mechanism of remaining oil was mainly the capillary sealing effect and the stripping effect of displacement fluid in pores;by optimizing the injection-production row spacing,injection-production well spacing and injection-production well number ratio,etc.,the recovery degree of remaining oil were effectively improved,in which the reservoir matrix permeability was positively correlated with the reasonable row spacing.Generally,in fractured reservoirs,the well-arranged sequence is 2～5,and increasing the ratio of injection-production wells and the number of water-injection wells could be used to meet the requirements of liquid supply and maintenance of formation pressure.
关键词
复杂地区油藏/剩余油分布/开发技术优化/采收率
Key words
Reservoirs in complex areas/Remaining oil distribution/Development technology optimization/Recovery factor
维普
万方数据