Abstract
The Bingham plastic flow model is predominantly used to predict the annular pressure in horizontal directional drilling (HDD); however, it estimates conservatively when using a two-speed viscometer with a high shear rate range of 300-600 RPM to determine the Bingham rheological parameters of the fluid. In this study, instead of the two-speed viscometer, a six-speed viscometer (shear rates of 3, 6, 100, 200, 300, and 600 RPM) was used in two HDD cases, and the annular pressure during pilot boring was predicted using the Bingham model with rheological parameters determined based on different shear rate ranges. The predicted pressures were compared to field measurements, and the comparison indicated favourable results for the Bingham model at the low shear rate range of 100-200 RPM. However, at high shear rate ranges of 200-300 and 300-600 RPM, the model overestimated the measurement up to 30% along the drill path and approximately 110% near the exit pit.
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