Document Type : Original Research Paper
Authors
1 Master of Science in Drilling Engineering, Faculty of Petroleum and Geo-Energy Engineering, Amirkabir University of Technology
2 Petroleum and Geoenergy Department, Amirkabir University of Technology
3 Associate Professor, Faculty of Mining Engineering, Amirkabir University of Technology
Abstract
Drilling performance is enhanced by thorough well cleaning, which lowers torque and drag, increases penetration rate, and minimizes pipe sticking. Drilling fluid characteristics, cutting size and shape, BHA design, nozzle configuration, well deviation, flow rate, and penetration rate are important influencing factors. This study assesses these parameters in a controlled laboratory environment. Cutting accumulation zones were identified, and a notable innovation was optimising pump rate, particularly in areas prone to clogging. Examining the combined effects of two stabilizer types, including their positioning and orientation, was a novel approach. Software from the experiment and the Landmark was used to analyze the primary parameters. DOE supported the introduction of a new cutting transporting efficiency index. The effects of different fluid rheologies on cleaning efficiency and pressure loss were investigated in more detail. Performance metrics for various cutting sizes and materials were evaluated, along with drill string rotation. Plots were created to reveal patterns in hole-cleaning effectiveness and pressure drop. Pressure losses were examined under a realistic drill string configuration, with a focus on the effects of nozzle size and various hydraulic scenarios. The pressure drop was unaffected by the stabilizer type used; however, the cleaning effectiveness required careful placement. Denser cuttings resulted in a greater pressure drop and decreased cuttings removal, whereas smaller cuttings were associated with a lower Inverse Hole Cleaning Index (IHCI). In areas where sticking is more likely, the cutting bed height decreased as the pump rate increased.
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