A new model for fracturing fluid leak-off in a single natural fracture Online publication date: Mon, 25-Mar-2019
by Cong Lu; Xinghao Gou; Jianchun Guo; Fuguo Xia
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 20, No. 3, 2019
Abstract: Hydraulic fractures can open or penetrate natural fractures when naturally fractured oil and gas reservoirs are hydraulically fractured. Meanwhile, fracturing fluids enter the natural fractures, significantly increasing the leak-off volume. This paper proposes a new model of fracturing fluid leak-off in a single activated natural fracture, taking the deposition of solid-phase residues into account. The impact of leak-off on the viscosity of the fracturing fluids, volume concentration of the solid-phase residues, and critical natural fracture width were analysed using example calculations. The leak-off in a natural fracture mainly occurred in the beginning when the fracturing fluids enter the fracture. Within a few minutes, the viscosity of the fracturing fluids, the particle size, and dosage of solid-phase residues reached an optimal value range. The model calculation results provide guidance for the control of fracturing fluid leak-off in a natural fracture. [Received: March 8, 2016; Accepted: January 28, 2017]
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