Abstract
In an effort to figure out the causes of reamer blade balling which occurs during hole enlargement while drilling, a solid-liquid two-phase flow model was built to simulate the cutting movement, and the simulation data were analysed. The results demonstrated that there were three dominating factors for balling: high speed vortex, high speed fluid regions which do not cover the whole reamer blade and the backflow, as well as eddy and stagnation regions appearing in the top and bottom fluid channels. In addition, further research studied three specific aspects: drilling parameters, drilling fluid parameters and the reamer-fluid structure. Then, the “dredge path, broaden region” anti-balling design principle was examined along with three evaluation criteria for flow characteristics. The optimum reamer-fluid structure and applicable field conditions were determined. The results obtained from our research will contribute to the design of reamers and the efficiency of drilling.
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