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- W4385575212 abstract "The high production period of oil Wells in tight reservoirs represented by Yingxi area in Qaidam Basin is less than 60 days after fracturing, and the initial decline rate is more than 70%, making it difficult to stabilize production. Aiming at this situation, the technology to improve the imbibition effect of fracturing fluid is put forward. In this paper, the imbibition mechanism is studied and seven imbibition modes exist in the reservoir after fracturing are proposed, Mode 1: unilateral downward contact, reverse, vertical imbibition; Mode 2: unilateral upward contact, reverse, vertical imbibition; Mode 3: unilateral contact, reverse, plane imbibition; Mode 4: bilateral contact, reverse, plane imbibition; Mode 5: bilateral contact, co-direction, plane imbibition; Mode 6: bilateral contact, vertical imbibition; Mode 7: Peripheral contact imbibition. The imbibition force includes buoyancy and capillary force, while the resistance includes viscous force, capillary pressure on end face and gravity. The smaller the capillary, the greater the oil-water interfacial tension, the smaller the wetting Angle and the greater the capillary force. The larger the capillary, the greater the difference between oil and water density, the greater the buoyancy. The larger the capillary, the smaller the oil viscosity and viscosity. The more end faces, the greater the end effect. On the whole, the higher the permeability, the more hydrophilic the rock, the more developed the fracture, the higher the imbibition efficiency. According to the analysis factors, the function of surfactant needed to improve imbibition efficiency is required. In order to achieve better imbibition efficiency, the surfactant needs to have ① can change the oil-wet rock to water-wet; ② The adsorption loss on the rock surface is as small as possible; ③ It can maintain a certain oil-water interfacial tension to provide power for fracturing fluid imbibition; ④ Reduce oil phase viscosity; ⑤ Reduce the end effect and so on." @default.
- W4385575212 created "2023-08-05" @default.
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- W4385575212 date "2023-01-01" @default.
- W4385575212 modified "2023-09-27" @default.
- W4385575212 title "Study on Imbibition Mode of Reservoir Fracturing" @default.
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- W4385575212 doi "https://doi.org/10.1007/978-981-99-1964-2_182" @default.
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