Analysis of Transient Flow Field and Rock Cuttings Trajectory in Large-Diameter Reaming Drilling

• DOI: 10.22158/asir.v8n4p149
• Publication Date: 2024-11-22T10:26:43Z
• Authors: Peishu Li; Ke Gao; Yumin Wen; Yan Zhao
• Keywords: Debris flow; Cutting

This paper investigates the transient flow field characteristics and rock cuttings trajectory during large-diameter reaming drilling, aiming to address issue of low debris removal efficiency. By establishing a liquid-solid two-phase numerical model, bundled down-the-hole hammer for 830mm drilling was simulated, velocity, pressure distribution, movement within hole bottom return channel were analyzed. The study found that bit rotation significantly influences field, increasing area high-speed regions at bottom, enhancing average velocity facilitating cuttings. Simultaneously, difference in is crucial transporting pipe, there exists an optimal critical value speed achieve best reverse circulation effect field. analysis shows can be divided into three stages, with different distribution each stage. Increasing diameter helps enlarge cuttings, improving provides theoretical guidance efficiency drilling.