Study on the flow field of multi-phase coupling slag discharge and the influencing factors of slag discharge effect in gas lift reverse circulation of drilling shaft sinking
Longhui Guo1
Hua Cheng2
Zhishu Yao1
Chuanxin Rong1
Guang Yang3
Xiaoyun Wang1
Yu Fang1
Bao Xie1
1.School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,China2.School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,China;School of Resources and Environmental Engineering,Anhui University,Hefei,China;Anhui Provincial Key Laboratory of Building Structure and Underground Engineering,Anhui Jianzhu University,Hefei,China3.China Coal Special Drilling Co.,Ltd.,Hefei,China
摘要：Combined with the advanced drilling of the central return air shaft in Kekegai Coal Mine,the distribution law of slag dis-charge flow field by drilling method and the influencing factors of slag discharge effect are studied.Firstly,the numerical model of gas-liquid-solid coupling slag discharge is established by CFD-DEM(computational fluid dynamics coupled dis-crete element method).Then,the flow field distribution law of the site slag outlet layout model and the optimization model is compared and analyzed.Finally,the influence of drilling parameters on slag discharge effect is studied.The results show that the best arrangement of slag suction ports is:the number is two,the length-diameter ratio is 0.4,the area ratio is 1,and the total area ratio is 1.94％.The fluid movement at the bottom of the well is mainly tangential flow,while the fluid in the slag discharge pipe is mainly axial flow.The construction parameters of efficient slag discharge are put forward:bit rotation speed is 8.7 r/min,gas injection rate is 4200 m3/h,air duct sinking ratio is 0.84,and mud viscosity is 165 MPa·s.The research results can provide useful theoretical reference for large-scale sinking construction in deep wells.
机标关键词：couplingstudyfieldslagflowliftcirculationdischarge
论文发表日期：2024-12-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：20( 101-120 )
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