吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (6): 1844-1851.doi: 10.13229/j.cnki.jdxbgxb201506017

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Development and test of a large diameter hollow-through DTH air hammer and drill bit used in rescue well

GAN Xin, YIN Kun, HE Jiang-fu, YIN Qi-lei   

  1. 1.College of Construction Engineering, Jilin University, Changchun 130026, China;
    2.Laboratory of Technology for Drilling under Complex Condition of Ministry of Land and Resources, Jilin University, Changchun 130026, China
  • Received:2014-08-22 Online:2015-11-01 Published:2015-11-01

Abstract:

A hollow-through Down the Hole (DTH) air hammer with large diameter and a reverse circulation drill bit are developed; then computational simulation and field test are carried out. The test results show that the maximum penetration rate of the DTH air hammer can reach 6 m/h, and the average penetration rate is 4.5 m/h. in addition, the removing cuttings are smooth with reverse circulation. Furthermore, the cuttings are rarely accumulated in the bottom of borehole, and the borehole quality is excellent. Therefore, using the DTH air hammer and drill bit could resolve the problems of rock breaking and removing cuttings, and meet the requirements of penetration rate and borehole quality in the operation of large-diameter emergency rescue well drilling.

Key words: mine safety, rescue well, large diameter down-the-hole(DTH) air hammer, reverse circulation drill bit, ejector

CLC Number: 

  • TD713.32
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