新疆石油地质

›› 2019, Vol. 40 ›› Issue (2): 1-1.doi: 10.7657/XJPG20190214

• 论文 •    

储集层非均质性对低渗透油藏CO2驱油气窜的影响规律

贾凯锋1，王玉霞1，王世璐1，计董超2a，刘斌2b，张瑞尧1，高金栋1   

  1. (1.西北大学 地质学系 大陆动力学国家重点实验室,西安 710069;2.中国石油 新疆油田分公司 a.低效油田开发公司;b.陆梁油田作业区,新疆 克拉玛依 834000)
  • 出版日期:2019-04-01 发布日期:1905-07-16

Influences of Reservoir Heterogeneity on Gas Channeling During CO2 Flooding in Low Permeability Reservoirs

JIA Kaifeng1, WANG Yuxia1, WANG Shilu1, JI Dongchao2a, LIU Bin2b, ZHANG Ruiyao1, GAO Jindong1   

  1. (1.Department of Geology/State Key Laboratory for Continental DynamicsNorthwest University Xian, Shaanxi 710069, China2.PetroChina Xinjiang Oilfield Company, a.Low-Efficient Oilfield Development Company; b.Luliang Oilfield Operation District, KaramayXinjiang 834000China)
  • Online:2019-04-01 Published:1905-07-16

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摘要： 为了提高低渗透油藏CO2驱油的原油采收率并最大限度地抑制CO2气窜现象，通过室内实验，研究储集层非均质性（平面和纵向）对CO2驱油过程中气窜的影响，基于实验效果分析了不同模型产油量、最终驱油效率、见气时间、气窜时间及驱替压差等的变化特点。结果表明，在纵向上，储集层渗透率级差越小，CO2驱油过程中气窜时间越晚；在平面上，高注低采效果优于低注高采，即注入端渗透率较大时，CO2气窜时间较晚，驱替效果较好。研究成果为鄂尔多斯盆地低渗透油藏的开发提供了有益的支持。

Abstract: In order to improve the oil recovery of CO2 flooding in low-permeability reservoirs and inhibit the CO2 channeling, the paper studies the influences of reservoir heterogeneity on gas channeling during CO2 flooding through laboratory experiments. On the basis of the experimental results, the characteristics of the oil production, ultimate oil displacement efficiency, gas breakthrough time, gas channeling time and pressure drop of different models are analyzed. The results show that vertically, the smaller the permeability contrast is, the later the gas channeling time will be; horizontally, the results of the model with high injection rate and low recovery factor are better than that with low injection rate and high recovery factor, that is, the higher the permeability at the inlet end，the later the CO2 channeling time, the better the oil displacement effect. The study result provides a beneficial support for the low permeability reservoir development in the Ordos basin

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