In order to study the cuttings removal performance of a bundling-reaming pneumatic impactor, a cuttings flow field model was established, the computational fluid dynamics theory and FLUENT simulation software were employed to simulate the gas-solid two-phase flow field and the impact of different drilling speed and the mass flow of exhaust gas on the cuttings removal performance were analysed.The gas phase characteristics, the distribution of debris flow, the particle concentration distribution under different drilling velocity and inlet gas flow rate were discussed.The results show that:once the exhaust enters into the field, its speed will slow down, the field pressure will maintain in a gradient distribution and gradually decrease from the entrance to exit; cuttings particles will be gathered around the bottom and there is minor variation in their average concentration as they are distributed in the contrary direction against the entrance, while the maximum concentration descends along the same direction and finally becomes stable; during construction, the maximum drilling speed should be less than 8.4 m/h, as the mass flow rate of exhaust gas increases, the carrying ability increases as well.
Key words
gas-solid two-phase flow /
particle concentration /
cuttings flow field /
bundling-reaming pneumatic impactor /
numerical simulation
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