Modeling hydrodynamics of the flushing fluid intermittent flow in the hydraulic system of the diamond bit

Dreus, Andrii; Lysenko, K. V.; Kozhevnykov, Anatolii; Liu, B

doi:10.15407/mining11.02.084

Cited by 2 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is possible to use thermal factor for rock decomposition by switching the bottom-hole flushing mode to the pulse mode. Various physical effects related to the changes in hydraulic dynamics during pulse flushing were in detail discussed earlier (Dreus, Lysenko, Kozhevnykov, & Liu, 2017). The outcomes of the conducted research (Dreus, Kozhevnikov, Lysenko, & Sudakov, 2016) testify that the pulse flushing mode allows to increase the contact temperature and enhance the rate of drilling.…”

Section: Introductionmentioning

confidence: 88%

Power consumption of rock decomposition process during diamond core drilling using pulse flushing

Kozhevnykov¹,

Dreus²

2018

Min. miner. depos.

Self Cite

View full text Add to dashboard Cite

Purpose. To study the impact of pulse flushing on the power consumption of rock decomposition during diamond core drilling.Methods. Theoretical analysis, processing of the obtained experimental data.Findings. The decrease in power consumption of rock decomposition process during drilling with jet pulse flushing was studied. The influence of the bottom-hole power and jet pulse flushing parameters on the efficiency of rock decomposition process was investigated. Physical mechanisms of mining rock degradation under the jet pulse flushing were considered in the article.Originality. It was established that the drilling performance is growing along with increasing of pauses between the flushing liquid supply intervals. At that, the relative reduction of energy consumption of the rock decomposition process is increasing when the bottom-hole power is decreasing. The study provides theoretical grounds for the increase in the mechanical rate of drilling during the jet pulse flushing owing to utilization of the generated frictional thermal energy in the bottom-hole. It is demonstrated that using pulse flushing intensifies the processes of thermal cycling degradation of the mining rock. Practical implications.It is demonstrated that the pulse flushing mode has a potential to improve the performance of diamond core drilling. The outcomes of the research can be useful for grounding the specifications of the jet pulse flushing method during the development of the energy saving modes of diamond core drilling processes.

show abstract

Section: Introductionmentioning

confidence: 88%

Power consumption of rock decomposition process during diamond core drilling using pulse flushing

Kozhevnykov¹,

Dreus²

2018

Min. miner. depos.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The matter of enhancing the efficiency of diamond core drilling by using the heat factor calls for researching of thermophysical processes in the downhole area in order to establish the influence of the drilling fluid circulation rate to the contact temperature of drilling [17]. At the moment, there are very few research works dedicated to this issue, while the achieved results represent only particular instances which, therefore, require an expand of the existing database of the experimental research findings.…”

mentioning

confidence: 99%

Drilling fluid circulation rate influence on the contact temperature during borehole drilling

Kozhevnykov¹,

Dreus²,

Лиу³

et al. 2018

SBNMU

View full text Add to dashboard Cite

ВплиВ Витрати промиВальної рідини на контактну температуру при бурінні сВердлоВинPurpose. To establish the influence of drilling fluid circulation rate onto the contact temperature during the rotation drilling using an impregnated diamond drill bit; to verify the mathematical model of the diamond drill bit heating process in the course of boreholes drilling.Methodology. Bench experiments and theoretical analysis using methods of mathematical modeling. Findings. In the course of the bench experiments the data of influence of the drilling fluid circulation rate on the contact temperature during drilling of granite rock with a 59-mm diameter drill bit were obtained. A relevant mathematical model of the drill bit heating under the variable rate of drilling fluid was represented on the basis of a system of the heat transfer differential equations. A comparative analysis of experimental and predicted data was carried out, and its findings positively confirm the reliability of the mathematical modeling of heat transfer processes in the downhole during bore-hole drilling.Originality. The methodology of experimental measuring of the contact temperature during the bench experiment borehole drilling using resistance sensors was proposed herein. New experimental data was obtained which allowed establishing a correlation between the contact temperature and the rate of drilling fluid in the downhole area. The proposed mathematical model of the process is found to be adequate; it allows predicting the temperature mode on the working face of borehole in the course of drilling. The findings of the research make it possible to substantiate the effect of the diamond core drilling performance gaining due to transition from the fixed time operation parameters to the variable ones.Practical value. The regularities of action of the drilling fluid circulation rate on the contact temperature of the "tool -working face" system in the course of borehole drilling were established. The performed research confirmed the possibility of managing the thermal mode of drilling by variation of the drilling fluid circulation rate. The diamond core drilling performance gains, therefore, are possible to achieve by way of increasing the thermal stimulation of the mining rock. The developed mathematical model allows forecasting the contact temperature in the course of borehole drilling for various values of the drilling fluid circulation rates. Using of this model makes it possible to define the permissible diminishing of the drilling fluid circulation rate in order to prevent any abnormal thermophysical wear of the drill bit.Keywords

show abstract

Modeling hydrodynamics of the flushing fluid intermittent flow in the hydraulic system of the diamond bit

Cited by 2 publications

References 9 publications

Power consumption of rock decomposition process during diamond core drilling using pulse flushing

Power consumption of rock decomposition process during diamond core drilling using pulse flushing

Drilling fluid circulation rate influence on the contact temperature during borehole drilling

Contact Info

Product

Resources

About