塔河油田单井注氮气采油技术现场应用

Field application of oil recovery technique by nitrogen injection in single-well in Tahe Oilfield

塔河油田碳酸盐岩缝洞型油藏经过多年开发后,底水锥进、油水界面抬升,剩余油主要以阁楼油形式富集。现场实践证实注氮气采油开发碳酸盐岩缝洞型油藏是可行的,能有效动用阁楼型剩余油,并且在实践中总结了注氮气采油的选井经验,建立了高效注气井分类模型,为同类碳酸盐岩缝洞型油藏开发提供了参考依据。注氮气采油技术是一种高效提高采收率的技术手段。

After years of development of fractured-vuggy carbonate reservoirs in Tahe Oilifeld, the bottom water coning occurs and oil/water contact rises, and the remaining oil accumulates mainly by way of attic oil. Field practice shows that oil recovery by injecting nitrogen is viable in fracture-vuggy carbonate reservoirs, which can effectively produce the attic-type remaining oil. It is a highly-efifcient technique to increase crude recovery rate. In ifeld practices, the experiences in well selection for producing oil by injecting nitrogen were summarized, and the model for efifcient gas injection well classiifcation was built, providing the basis for the development of fractured-vuggy carbonate oil reservoirs. Oil production by nitrogen injection is a technique to efifciently improve oil recovery rate.