Development of a specially designed drill bit for down-the-hole air hammer to reduce dust production in the drilling process

Luo, Yongjiang; Peng, Jianming; Li, Lijia; He, Jie; Gan, Xin; Yin, Kai; Zhao, Zhiqiang

doi:10.1016/j.jclepro.2015.08.014

Cited by 33 publications

(17 citation statements)

References 5 publications

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“…Obvious suction phenomena can be observed during the test, as shown in Figure 4. A high entrainment ratio up to 0.76 was obtained, which made an approximate doubling improvement of the entrainment ratio compared with 0.3 of the previous reverse-circulation drilling method [4]. The results obtained by orthogonal design and ANOVA reveal the primary and secondary sequence of the factors, however, how these factors work on the suction performance need to be further investigated.…”

Section: Parameter Analysismentioning

confidence: 84%

“…This method utilizes the nozzle suction effect to draw in and pump a significant amount of air with the cuttings and dust to the ground for collection. It is a highly efficient and cleaner drilling technique aimed to protect the environment and human health [4]. A high penetration rate and good quality of borehole are also important advantages to shorten time and save cost.…”

Section: Introductionmentioning

confidence: 99%

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Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Yin

et al. 2016

Applied Sciences

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Abstract:To reduce dust generated from drilling processes, a reverse circulation drilling method based on a supersonic nozzle is proposed. The suction performance is evaluated by the entrainment ratio. A series of preliminary laboratory experiments based on orthogonal experimental design were conducted to test the suction performance and reveal the main factors. Computational fluid dynamics (CFD) were conducted to thoroughly understand the interaction mechanism of the flows. The Schlieren technique was further carried out to reveal the flow characteristic of the nozzle. The results show that the supersonic nozzle can significantly improve the reverse circulation effect. A high entrainment ratio up to 0.76 was achieved, which implied strong suction performance. The CFD results agreed well with experimental data with a maximum difference of 17%. This work presents the great potential for supersonic nozzles and reverse circulation in dust control, which is significant to protect the envrionment and people's health.

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Section: Parameter Analysismentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Yin

et al. 2016

Applied Sciences

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“…For example, a use of expensive equipment for open drilling, blasting and transportation is proposed in the work (Luo, 2016), the use of which reduces a dust formation. The listed methods are practically not applied in view of their processing complexity and costliness.…”

Section: Research Questionsmentioning

confidence: 99%

Special Purpose Products for Mining Industry Enterprises

Kondrasheva¹

2017

European Proceedings of Social and Behavioural Sciences

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The issues, related to production of special purpose agents, intended for dust control in pits and on temporary highways, were considered and solved in this work. The agents are developed on the basis of high-aromatic distillate fractions and black oil fuel. In order to achieve qualitative and optimum compositions of finished preventive agents, the physical and chemical properties and hydrocarbon composition of source raw material -gas oils of thermodestructive and thermocatalytic processes and black oil fuel, as well as a depressing ability of the last, were examined in detail in the work. The prepared compositions will allow us to increase a crude oil upgrading index in the oil-processing plant and to increase profit of the enterprise. Along with economic benefit of a manufacturer, an application of preventive agents is also beneficial for a consumer. Application of these products will allow improving the general ecological situation both in pits and on temporary highways.

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“…Therefore, low air consumption and the consequent capability in large‐diameter‐hole drilling is a distinct advantage for the air RC drilling, which significantly reduces the reaming cost and operation time. Additionally, as the air and drilling cuttings exhausted from the discharge pipe can be guided directly into the cuttings and dust collector unit placed far from the drill site, the operating environment is improved and the atmosphere is oil‐free, thus hindering the drill workers and equipment from the threat of drilling dust …”

Section: Introductionmentioning

confidence: 99%

Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling

Zhang

Luo

Gan

et al. 2019

Energy Science & Engineering

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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.

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Development of a specially designed drill bit for down-the-hole air hammer to reduce dust production in the drilling process

Cited by 33 publications

References 5 publications

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Special Purpose Products for Mining Industry Enterprises

Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling

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