关键词: 低渗透,    ,  薄互层,     纵向剩余油,    , 重复压裂,   ,  地应力

Abstract: Two layers , including K1 and K2, are mainly developed for the low permeability reservoir in the Ordos Basin. The main layer of the K1 with interlayer growth contains 4 lower layers. However, with more than 20 years producing, re-fracturing for filling and extension the old hydraulic fracture couldn't extract remaining oil obviously because of the interlayers and heterogeneity, which cause the water cut rising and oil increment decreased year by year. Physical property boundary and stimulation evaluation about the residual oil have been evaluated on the analysis of the vertical distribution of remaining oil in reservoir. The main influence factors of the effect of repeated fracturing control by orthogonal design principle of are obtained after researching the alternation of stress and physical property. Fracturing technology of the "hydraulic jetting+K344 single packer" is put forward for the remaining oil. The field test of 10 wells after application of full 3D fracturing software to optimize the key parameters of refracturing proof that the oil per day is nearly 1.5 times as much as the initial production.

Key words: Low permeability,    , Thin-mutual layer,    , Vertical remaining oil,    , Repeated fracturing,    , Stress