Modeling Method for Multiple-Fractured Horizontal Well in Tight Oil Reservoirs
Because of the ultra-low permeability of tight oil reservoirs and the limited seepages from matrix to fracture, multiple-fractured horizontal well (MFHW) is becoming the main prevalent way to exploit tight oil reservoirs. Fracture description after massive fracturing is a puzzle because of the unclear understanding of artificial fractures and natural fractures. Fracture modeling software always requires a large number of FMI data, while so many wells did not have. To effectively describe the multistage fractured well without so many detailed data, a dual-permeability model with different refined grids in SRV is used to simulate hydraulic fractures, natural fractures, and matrix, respectively. Firstly, estimated parameter was obtained by well testing analysis. The buildup curve indicates the reservoir after massive fracture is dual-permeability media, and parameters such as porosity (matrix/fracture), permeability (matrix/fracture), and pressure are obtained. Then, sensitivity analysis is performed to find the parameter’s impact sequence on oil production and water production. Finally, the accurate parameters of hydraulic fracture, natural fracture, and matrix are obtained via history matching on the basis of the parameters estimated. The production forecast coincides with the real data of this well, which proves the feasibility of this modeling method for massive fractured well in tight oil reservoir.
KeywordsTight oil Massive fracturing Horizontal well Numerical simulation Dual permeability
This work is supported by the National Science and Technology Major Project (No. 2016ZX05023). The authors would express their appreciation to the project for contribution of the research fund.
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