Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling
Abstract Reverse circulation down‐the‐hole (RC‐DTH) air hammer drilling is a fast and cost‐effective method for hard rock drilling. As the air RC drill bit is the heart for RC‐DTH air hammer drilling system to form the reverse circulation, a large‐diameter RC drill bit was innovatively designed and...
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Online Access: | https://doi.org/10.1002/ese3.321 |
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doaj-1f94788ebed14b2a806385aec1741f542020-11-25T00:10:51ZengWileyEnergy Science & Engineering2050-05052019-06-017392192910.1002/ese3.321Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drillingXinxin Zhang0Yongjiang Luo1Xin Gan2Kun Yin3State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing ChinaDrilling Engineering and Technology Research Institute Zhongyuan Petroleum Engineering Co. Ltd, SINOPEC Puyang ChinaKey Laboratory of Drilling and Exploitation Technology in Complex Conditions Ministry of Land and Resources Jilin University Changchun ChinaAbstract Reverse circulation down‐the‐hole (RC‐DTH) air hammer drilling is a fast and cost‐effective method for hard rock drilling. As the air RC drill bit is the heart for RC‐DTH air hammer drilling system to form the reverse circulation, a large‐diameter RC drill bit was innovatively designed and numerically optimized with respect to the suction ability. Results show that increasing the suction‐nozzle elevation angle and deflection angle can improve the drill bit suction ability. The drill bit performance reaches its optimal state when the air flow rate was about 1.205 kg/s, thereafter it exhibits a reverse variation trend with the increase in air mass flow rate. The optimum diameter of the suction nozzles is 20 mm for the drill bit studied in this work. The RC drill bit with outer diameter of 665 mm and RC‐DTH air hammer with outer diameter of 400 mm were manufactured and a field trial was conducted. Field test results show that the penetration rate using the RC‐DTH air hammer drilling method is more than twice the conventional rotary drilling method. This drilling approach poses a great potential for the large‐diameter hard rock drilling applied in the upper portions of a well bore above the potential producing reservoir formation for land oil and gas drilling, geothermal drilling and relevant field drilling operations.https://doi.org/10.1002/ese3.321RC drill bitRC‐DTH air hammerreverse circulationsuction ability |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xinxin Zhang Yongjiang Luo Xin Gan Kun Yin |
spellingShingle |
Xinxin Zhang Yongjiang Luo Xin Gan Kun Yin Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling Energy Science & Engineering RC drill bit RC‐DTH air hammer reverse circulation suction ability |
author_facet |
Xinxin Zhang Yongjiang Luo Xin Gan Kun Yin |
author_sort |
Xinxin Zhang |
title |
Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling |
title_short |
Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling |
title_full |
Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling |
title_fullStr |
Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling |
title_full_unstemmed |
Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling |
title_sort |
design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling |
publisher |
Wiley |
series |
Energy Science & Engineering |
issn |
2050-0505 |
publishDate |
2019-06-01 |
description |
Abstract Reverse circulation down‐the‐hole (RC‐DTH) air hammer drilling is a fast and cost‐effective method for hard rock drilling. As the air RC drill bit is the heart for RC‐DTH air hammer drilling system to form the reverse circulation, a large‐diameter RC drill bit was innovatively designed and numerically optimized with respect to the suction ability. Results show that increasing the suction‐nozzle elevation angle and deflection angle can improve the drill bit suction ability. The drill bit performance reaches its optimal state when the air flow rate was about 1.205 kg/s, thereafter it exhibits a reverse variation trend with the increase in air mass flow rate. The optimum diameter of the suction nozzles is 20 mm for the drill bit studied in this work. The RC drill bit with outer diameter of 665 mm and RC‐DTH air hammer with outer diameter of 400 mm were manufactured and a field trial was conducted. Field test results show that the penetration rate using the RC‐DTH air hammer drilling method is more than twice the conventional rotary drilling method. This drilling approach poses a great potential for the large‐diameter hard rock drilling applied in the upper portions of a well bore above the potential producing reservoir formation for land oil and gas drilling, geothermal drilling and relevant field drilling operations. |
topic |
RC drill bit RC‐DTH air hammer reverse circulation suction ability |
url |
https://doi.org/10.1002/ese3.321 |
work_keys_str_mv |
AT xinxinzhang designandnumericalanalysisofalargediameterairreversecirculationdrillbitforreversecirculationdowntheholeairhammerdrilling AT yongjiangluo designandnumericalanalysisofalargediameterairreversecirculationdrillbitforreversecirculationdowntheholeairhammerdrilling AT xingan designandnumericalanalysisofalargediameterairreversecirculationdrillbitforreversecirculationdowntheholeairhammerdrilling AT kunyin designandnumericalanalysisofalargediameterairreversecirculationdrillbitforreversecirculationdowntheholeairhammerdrilling |
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