Yang Liuqing Liu Bin Yao Kunpeng.Cuttings Carrying Behavior of Coring Tools Based on Fluent⁃EDEM Coupling Model[J].China Petroleum Machinery,2025,53(10):79-85.
Yang Liuqing Liu Bin Yao Kunpeng.Cuttings Carrying Behavior of Coring Tools Based on Fluent⁃EDEM Coupling Model[J].China Petroleum Machinery,2025,53(10):79-85.DOI: 10.12473/CPM.202505056.
Cuttings Carrying Behavior of Coring Tools Based on Fluent⁃EDEM Coupling Model
To improve cuttings carrying efficiency in coring operation of ultra⁃deep wells, the cuttings carrying performance of coring tools under complex conditions was studied. Considering the key parameters such as coring tool specification, cuttings size,rate of penetration, drilling fluid viscosity and annular clearance of coring tool outer barrel, a 3D numerical model of various specifications of coring tools was constructed based on the Fluent⁃EDEM method to simulate the movement behavior of cuttings in the annulus. The study results show that the rate of penetration has a significant effect on the cuttings carrying efficiency, and appropriately increasing the rate of penetration can enhance the cuttings transport capacity. When the cuttings size is small, increasing the drilling fluid viscosity is favorable for improving the cuttings carrying efficiency, but when the cuttings size is large, the effect is weakened. An increase in cuttings size would reduce the carrying efficiency, but due to a decrease in the number of cuttings generated per unit time, the cuttings carrying capacity is conversely promoted to some extent as a whole. Increasing the outer annular clearance can broaden the cuttings flow channel and contribute to the discharge of cuttings, but the negative impact of reduced flow velocity needs to be balanced. The study results clarify the influence mechanism of various parameters on the cuttings carrying efficiency, put forward the direction and suggestions for the structural optimization of coring tools, and provide references for the subsequent efficient coring of ultra⁃deep wells.
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