Parameter Optimization of Drilling Cuttings Entering into Sieve Holes on a Surface Multi-Hole (SMH) Drill Pipe

Lipei Ding, Yuning Sun, Zhiming Wang, Weibin Song and Yonglong Wang
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Lipei Ding: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Yuning Sun: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Zhiming Wang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Weibin Song: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Yonglong Wang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Energies, 2022, vol. 15, issue 10, 1-17

Abstract: The borehole drilling distance is short in soft and gas outburst-prone coal seams because of drill pipe jamming induced by cuttings accumulating in the borehole, hindering coal mine gas hazard prevention and utilization. A surface multi-hole (SMH) drill pipe composed of a bearing layer, fluid layer, and anti-sparking layer was proposed preliminarily, where several sieve holes were also set. To study the process of drilling cuttings in boreholes entering into the inner hole of an SMH drill pipe and its influencing factors, mechanical model analysis, CFD-DEM simulation, and a physical experiment were conducted. Our research results show the cutting entering region (CER) of the SMH drill pipe shrinks with the rotary speed, expands with the external extrusion force, and is offset with the sieve hole inclination angle. The drilling cuttings migrate and accumulate over time between the borehole wall and SMH drill pipe, which increases their compressive forces and induces increases in the mass and diameter of those entering into the sieve holes. The sieve hole diameter and depth are critical factors impacting the drilling cuttings entering into the sieve holes, which is also related to an appropriate rotary speed of the drill pipe. Finally, SMH drill pipes with a sieve hole diameter of 10 mm, inclination angle of 10°, and depth of 8 mm were determined and trial-manufactured.

Keywords: borehole drilling; surface multi-hole drill pipe; sieve hole; cutting entering region (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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