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Study on motion equations and technical parameters of borehole restoration for self-propelling drill
Author: LIU Yong DAI Shuo WEI Jianping GUO Xinhui YUAN Yongwang Time: 2023-05-10 Counts:

LIU Y, DAI S, WEI J P,et al.Study on motion equations and technical parameters of borehole restoration for self-propelling drill[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(3):1-9.

doi:10.16186/j.cnki.1673-9787.2021110075

Received:2021/11/18

Revised:2022/02/28

Published:2023/05/25

Study on motion equations and technical parameters of borehole restoration for self-propelling drill

LIU Yong1,2,3, DAI Shuo1,2,3, WEI Jianping1,2,3, GUO Xinhui1,2,3, YUAN Yongwang1,2,3

1.State Key Laboratory Cultivation Base for Gas Geology and Gas ControlHenan Polytechnic UniversityJiaozuo  454000HenanChina;2.State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency UtilizationHenan Polytechnic UniversityJiaozuo  454000HenanChina;3.College of Safety Science and EngineeringHenan Polytechnic UniversityJiaozuo  454000HenanChina

Abstract:To address the problem of large error in the calculation of long hole restoration parameters for exis-ting self-propelled rotary drill hole restore theorya borehole restoration equation of motion was establised based on Newton’s law of variable massand the relationship between restoration length and hydraulic parametersborehole parameters and pipe parameters was derived.System resistance test experiments were carried outthe effects of borehole lengthanglereturn water and movement speed on the integrated friction coefficient k were clarified.The equation of motion was revised and validated through self-propelling drill borehole restoration experiments.The results showed thatThe integrated friction coefficient k was the key parameter of the equations of motionThe system resistance linearly increased with increasing restoration distance during the movement of the self-propelling drillReturn water created resistance to the drill and high pressure hoseresulting in an increase in the integrated friction coefficient kAs the drill and high-pressure hose moved through the upward boreholethe component force of gravity became the resistanceThe increase in the angle of the borehole and jet pressure could lead to an increase in the return water flow rateresulting in an increase in the integrated friction coefficient kThe theoretical value of the integrated friction coefficient k needed to be corrected by a factor of 0.8The modified equation of motion allowed for a more accurate calculation of the maximum restore distance of a self-propelling drillthe error between the theoretical and experimental values was 5.7 m at a restoration distance of 104.7 mwhich verified the feasibility of applying the borehole restoration for self-propelling drill technology in long boreholes.

Key words:borehole restoration;water jet;self-propelling;restoration distance;change of resistance;gas extraction

  自进式旋转钻头钻孔修复运动方程及关键参数研究_刘勇.pdf

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