1. 基于格子 Boltzmann 模型的裂缝性储层 钻井液漏失数值模拟.
- Author
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谭启贵, 康毅力, 宋付权, 彭浩平, and 游利军
- Abstract
Focusing on the drilling fluid loss in fractured carbonate reservoirs during drilling operation, lattice Boltzmann mathematical model was proposed to characterize the drilling fluid loss in representative elementary volume (REV) scale based on simplified matrix-fracture dual-medium physical model. Velocity distribution in matrix-fracture system with drilling fluid loss was analyzed by numerical simulation, and drilling fluid loss behavior in matrix-fracture dual-medium system was discussed under the different geological conditions. The simulation results showed that microfractures dominated the loss channels for fractured tight carbonate rocks. The loss rate of drilling fluid in matrix exponentially increased with increasing porosity at lower range. The increase in fracture width led to the increase in flow average velocity, making the velocity in the fractures more uniform. Additionally, un- der the condition of the same total fractures width, the lost circulation rate in matrix-fracture system consisting of only one single fracture was higher than that in multiple fractures-combined system, In this paper, the lattice Boltzmann method was introduced to characterize the drilling fluid loss, and the results indicated that drilling fluid loss in fractured reservoir and filtration process from fracture to tight matrix could be well characterized by this method. This work could provide the theoretical foundation for drilling fluid loss and formation damage prevention in fractured tight reservoirs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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