Dynamic Non-Darcy Flow Compositional Numerical Simulation for CO2 Huff-n-Puff Development in Tight Oil Reservoir
- Qiong Wang (China U. of Petroleum, East China) | Rui zhong Jiang (China U. of Petroleum, East China) | Yong zheng Cui (China U. of Petroleum, East China) | Gewei Liu (CNOOC EnerTech-Drilling & Production Co.)
- Document ID
- Unconventional Resources Technology Conference
- SPE/AAPG/SEG Asia Pacific Unconventional Resources Technology Conference, 18-19 November, Brisbane, Australia
- Publication Date
- Document Type
- Conference Paper
- 2019, Unconventional Resources Technology Conference (URTeC)
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- 59 since 2007
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There is growing evidence showing that because of the interact between pore wall and fluid, the oil seepage in tight porous media conforms to low-velocity non-Darcy flow. However, in the process of CO2 Huff-n-Puff development, Darcy model or previously published low-velocity non-Darcy flow model with constantly non-linear parameter in most numerical simulator may cause inaccuracy in simulating the variation of non-linear degree since the mobility improvement of oil phase contacted with the injected CO2.
In this paper, a dynamic non-Darcy flow model linked to phase behavior calculation with capillary pressure is firstly presented that uses dynamic non-linear parameter, C1. Furthermore, two mechanism cases with unstructured-perpendicular-bisection (PEBI) grid and fractures presented by embedded-discrete-fracture model (EDFM) are established to respectively validate self-developed simulator and discuss the comparison of Darcy model, previously published non-Darcy model and dynamic non-Darcy model. Additionally, the effect of nanopores on dynamically non-linear degree is analyzed. Finally, field history matching of dynamic non-Darcy flow in actual field-scale model is conducted. Research shows that the dynamic non-Darcy flow model can properly describe the reduction of nonlinear degree of oil phase in the gas-injection swept and diffusion region. In addition, nanopores exhibits typical advantages on oil recovery because capillary pressure has the ability to degrade the non-linear degree of oil phase. Finally, this dynamic non-Darcy flow model enables to make the evaluation in well performance and bottom hole pressure more accurate.
|File Size||1 MB||Number of Pages||11|
Xu, F., Yu, W., Li, Xiangling, Miao, J., Zhao, G., Sepehrnoori, K., Li, Xianbin, Jin, J., Wen, G., 2018. A Fast EDFM Method for Production Simulation of Complex Fractures in Naturally Fractured Reservoirs. Presented at the SPE/AAPG Eastern Regional Meeting, Society of Petroleum Engineers, Brisbane, Australia.