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  • Estimation of optimal drilling efficiency and rock ...

    2020-10-1u2002·u2002The examination of the drilling mechanism revealed that the drilling energy is dissipated in different drilling stages, as shown in Fig. 1 and Eq., and the following effects were produced by the energy: (1) rock breakage, which is the desired result (Poletto, 2005); (2) other effects due to heat.In addition, the development of radial cracks involves a large proportion of the input energy ...

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  • Estimation of optimal drilling efficiency and rock ...

    Fundamental rock-drilling studies are aimed at optimizing the drilling efficiency by identifying the optimal drilling conditions and rock drillability. In this study, a field-drilling test is performed using a rotary non-percussive drilling machine equipped with a new drilling-monitoring system to investigate the effects of drilling parameters ...

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  • Identifying the Optimum Drilling Direction for ...

    A method developed by Zhou and Maerz (2002) for identifying the optimum drilling direction for characterizing a mass of discontinuous rock may prove applicable …

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  • The optimum bit geometry for rotary drilling of boreholes ...

    1976-11-1u2002·u2002A. N. Moskalev (editor), Increasing the effectiveness of Thermal and Mechanical Drilling [in Russian], Nedra, Moscow (1974). Google Scholar 5. Investigation and Creation of New Rock-Cutting Tool for Rotary Drilling of Boreholes in the Conditions of the Nikitov Mercury Combine [in Russian], Donetsk (1974). Download references

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  • Rock Drilling - an overview

    Rock drilling tools include those used for oil and natural gas exploration, mining, construction, and all other industrial operations that need to excavate or drill through natural rocks, concrete, and masonry. This is the second largest market segment that uses WC tools. ... Optimum Fragmentation. Zong-Xian Zhang, in Rock Fracture and Blasting ...

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  • Calculating optimum drilling conditions for deep

    1970-1-1u2002·u2002Rock Breaking; Published: 01 January 1970; Calculating optimum drilling conditions for deep boreholes. R. M. Éigeles, R. V. Strekalova & E. I. Korol'ko Soviet mining science volume 6, pages 46–49 (1970)Cite this article

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  • Computing optimum drilling fluid density based on ...

    2020-9-1u2002·u2002Under estimated drilling fluid density will induce shear failure of wellbore wall. Conversely, wellbore wall will occur tensile failure. Drilling engineers have been looking for an optimum drilling fluid density for a long time. A new method to compute the optimum drilling …

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  • Construction Planning, Equipment, CHAPTER DRILLING

    2008-4-14u2002·u2002CHAPTER 12b. DRILLING ROCK AND EARTH ENCE 420 ©Assakkaf Slide No. 84 RATES OF DRILLING ROCK Table 3 (Table 12-6b, Text) CHAPTER 12b. DRILLING ROCK AND EARTH ENCE 420 ©Assakkaf Slide No. 85 OPTIMUM AIR PRESSURE FOR DRILLING Figure 1 (Fig 11-15 Text) shows the relationship between the average rate of penetration and the operating pressure for each

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  • Determination of optimal well trajectory during drilling ...

    2012-12-1u2002·u2002In Case 2, the formation is in the boundary between normal fault and strike-slip regimes.Fig. 2 shows that, the horizontal boreholes are more stable than the vertical or all deviated boreholes in all directions. In addition, it is obvious that the risk of borehole instability decreases with increasing the inclination angle. The optimum drilling azimuth is still parallel to the minimum ...

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  • Identifying the Optimum Drilling Direction for ...

    A method developed by Zhou and Maerz (2002) for identifying the optimum drilling direction for characterizing a mass of discontinuous rock may prove applicable to …

    Get Price
  • (PDF) Improved Optimization and Visualization of Drilling ...

    Improved Optimization and Visualization of Drilling Directions for Rock Mass Discontinuity Characterization. ... The optimum drilling direction is the direction along …

    Get Price
  • UNDERGROUND DRILLING - Tunneling Short Course

    2018-9-26u2002·u2002UNDERGROUND DRILLING DRILLING POWER • Rock drills −Drilling power from 20 hpto 34 hp(15 kW to 25 kW) −Frequency 50…100 Hz • Flushing −Water flushing [from 15 up to 30 gallons minute (60 -120 lpm)] or −Air: 150 cfm @ 150 psi(4 m3/min @10 bar) with the air mist • Max. penetration rates −6 ftm–20 ftm(2 in. hole) (2 –6 m/min ...

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  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Drilling Parameters. The pull down force must be sufficient to fracture the rock. Excessive force causes bit wear and vibration damage to the drill. The optimum pull down depends on rock strength and bit size. For example, in a typical coal mine with a rock strength of 10 000 psi (69 MPa), the optimum pull down is about 67 kN (15 000 lb ).

    Get Price
  • Hard rock drilling problems explained by hard rock ...

    2021-10-5u2002·u2002Hard rocks are difficult to drill because of the extreme zig-zags from overpressured shales to sub-normally pressured sands and carbonates. It is impossible to drill anywhere near balanced in both situations, simultaneously. Hard rock drilling problems caused by underbalance or overbalance (or both) are a result.

    Get Price
  • MAJOR FACTORS AFFECTING DRILLING PENETRATION RATES

    2017-11-18u2002·u2002Rocks that contain gummy clays can cause the bit to ball up and drill inefficiently. The permeability of rock also affects penetration rate. In permeable rock, the drilling fluid filtrate can move into the rock ahead of the bit and equalize the pressure differential acting on the chips formed beneath each tooth and increase the penetration rate.

    Get Price
  • Influence of Weight-on-Bit on Percussive Drilling ...

    2020-9-5u2002·u2002A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. Several hypotheses have been previously proposed to explain this universal characteristic of percussive drilling, including increased wear of the bit, …

    Get Price
  • Underground Drilling - International Mining

    2012-6-1u2002·u2002In this month's Spotlight Feature Article, from the pages of the June 2012 issues of International Mining, Editor Paul Moore reports that Underground Drilling remains a challenging environment, so continued improvements from key machine and component suppliers continues to help mines improve efficiency, particularly as operations go deeper.

    Get Price
  • DelPat Software rock drilling blasting • drillblasts.com

    DelPat v9. Rock drilling blasting software, better results in design. Therefore accurate drilling, good blasting, optimum fragmentation, low costs and daily recordings. Now, please see the sections below to better understand or learn about the software.

    Get Price
  • ANALYSIS OF DRILLING TOOL LIFE—A REVIEW

    2015-4-9u2002·u2002523 Int. J. Mech. Eng. & Rob. Res. 2015 Dhanraj Patel and Rajesh Verma, 2015 ANALYSIS OF DRILLING TOOL LIFE—A REVIEW Dhanraj Patel1* and Rajesh Verma2 *Corresponding Author: Dhanraj Patel, [email protected] Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section

    Get Price
  • Identifying the Optimum Drilling Direction for ...

    A method developed by Zhou and Maerz (2002) for identifying the optimum drilling direction for characterizing a mass of discontinuous rock may prove applicable …

    Get Price
  • (PDF) Improved Optimization and Visualization of Drilling ...

    Improved Optimization and Visualization of Drilling Directions for Rock Mass Discontinuity Characterization. ... The optimum drilling direction is the direction along which the LSBI is minimized.

    Get Price
  • UNDERGROUND DRILLING - Tunneling Short Course

    2018-9-26u2002·u2002UNDERGROUND DRILLING DRILLING POWER • Rock drills −Drilling power from 20 hpto 34 hp(15 kW to 25 kW) −Frequency 50…100 Hz • Flushing −Water flushing [from 15 up to 30 gallons minute (60 -120 lpm)] or −Air: 150 cfm @ 150 psi(4 m3/min @10 bar) with the air mist • Max. penetration rates −6 ftm–20 ftm(2 in. hole) (2 –6 m/min ...

    Get Price
  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Drilling Parameters. The pull down force must be sufficient to fracture the rock. Excessive force causes bit wear and vibration damage to the drill. The optimum pull down depends on rock strength and bit size. For example, in a typical coal mine with a rock strength of 10 000 psi (69 MPa), the optimum pull down is about 67 kN (15 000 lb ).

    Get Price
  • Hard rock drilling problems explained by hard rock ...

    2021-10-5u2002·u2002Hard rocks are difficult to drill because of the extreme zig-zags from overpressured shales to sub-normally pressured sands and carbonates. It is impossible to drill anywhere near balanced in both situations, simultaneously. Hard rock drilling problems caused …

    Get Price
  • MAJOR FACTORS AFFECTING DRILLING PENETRATION

    2017-11-18u2002·u2002Rocks that contain gummy clays can cause the bit to ball up and drill inefficiently. The permeability of rock also affects penetration rate. In permeable rock, the drilling fluid filtrate can move into the rock ahead of the bit and equalize the pressure differential acting on the chips formed beneath each tooth and increase the penetration rate.

    Get Price
  • Influence of Weight-on-Bit on Percussive Drilling ...

    2020-9-5u2002·u2002A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. Several hypotheses have been previously proposed to explain this universal characteristic of percussive drilling, including increased wear of the bit, reduced indexing ...

    Get Price
  • Underground Drilling - International Mining

    2012-6-1u2002·u2002In this month's Spotlight Feature Article, from the pages of the June 2012 issues of International Mining, Editor Paul Moore reports that Underground Drilling remains a challenging environment, so continued improvements from key machine and component suppliers continues to help mines improve efficiency, particularly as operations go deeper.

    Get Price
  • DelPat Software rock drilling blasting • drillblasts.com

    DelPat v9. Rock drilling blasting software, better results in design. Therefore accurate drilling, good blasting, optimum fragmentation, low costs and daily recordings. Now, please see the sections below to better understand or learn about the software.

    Get Price
  • ANALYSIS OF DRILLING TOOL LIFE—A REVIEW

    2015-4-9u2002·u2002523 Int. J. Mech. Eng. & Rob. Res. 2015 Dhanraj Patel and Rajesh Verma, 2015 ANALYSIS OF DRILLING TOOL LIFE—A REVIEW Dhanraj Patel1* and Rajesh Verma2 *Corresponding Author: Dhanraj Patel, [email protected] Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section

    Get Price
  • Identifying the Optimum Drilling Direction for ...

    A method developed by Zhou and Maerz (2002) for identifying the optimum drilling direction for characterizing a mass of discontinuous rock may prove applicable to …

    Get Price
  • (PDF) Improved Optimization and Visualization of Drilling ...

    Improved Optimization and Visualization of Drilling Directions for Rock Mass Discontinuity Characterization. ... The optimum drilling direction is the direction along …

    Get Price
  • UNDERGROUND DRILLING - Tunneling Short Course

    2018-9-26u2002·u2002UNDERGROUND DRILLING DRILLING POWER • Rock drills −Drilling power from 20 hpto 34 hp(15 kW to 25 kW) −Frequency 50…100 Hz • Flushing −Water flushing [from 15 up to 30 gallons minute (60 -120 lpm)] or −Air: 150 cfm @ 150 psi(4 m3/min @10 bar) with the air mist • Max. penetration rates −6 ftm–20 ftm(2 in. hole) (2 –6 m/min ...

    Get Price
  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Drilling Parameters. The pull down force must be sufficient to fracture the rock. Excessive force causes bit wear and vibration damage to the drill. The optimum pull down depends on rock strength and bit size. For example, in a typical coal mine with a rock strength of 10 000 psi (69 MPa), the optimum pull down is about 67 kN (15 000 lb ).

    Get Price
  • Hard rock drilling problems explained by hard rock ...

    2021-10-5u2002·u2002Hard rocks are difficult to drill because of the extreme zig-zags from overpressured shales to sub-normally pressured sands and carbonates. It is impossible to drill anywhere near balanced in both situations, simultaneously. Hard rock drilling problems caused by underbalance or overbalance (or both) are a result.

    Get Price
  • MAJOR FACTORS AFFECTING DRILLING PENETRATION RATES

    2017-11-18u2002·u2002Rocks that contain gummy clays can cause the bit to ball up and drill inefficiently. The permeability of rock also affects penetration rate. In permeable rock, the drilling fluid filtrate can move into the rock ahead of the bit and equalize the pressure differential acting on the chips formed beneath each tooth and increase the penetration rate.

    Get Price
  • Influence of Weight-on-Bit on Percussive Drilling ...

    2020-9-5u2002·u2002A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. Several hypotheses have been previously proposed to explain this universal characteristic of percussive drilling, including increased wear of the bit, …

    Get Price
  • Underground Drilling - International Mining

    2012-6-1u2002·u2002In this month's Spotlight Feature Article, from the pages of the June 2012 issues of International Mining, Editor Paul Moore reports that Underground Drilling remains a challenging environment, so continued improvements from key machine and component suppliers continues to help mines improve efficiency, particularly as operations go deeper.

    Get Price
  • DelPat Software rock drilling blasting • drillblasts.com

    DelPat v9. Rock drilling blasting software, better results in design. Therefore accurate drilling, good blasting, optimum fragmentation, low costs and daily recordings. Now, please see the sections below to better understand or learn about the software.

    Get Price
  • ANALYSIS OF DRILLING TOOL LIFE—A REVIEW

    2015-4-9u2002·u2002523 Int. J. Mech. Eng. & Rob. Res. 2015 Dhanraj Patel and Rajesh Verma, 2015 ANALYSIS OF DRILLING TOOL LIFE—A REVIEW Dhanraj Patel1* and Rajesh Verma2 *Corresponding Author: Dhanraj Patel, [email protected] Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section

    Get Price
  • Identifying the Optimum Drilling Direction for ...

    A method developed by Zhou and Maerz (2002) for identifying the optimum drilling direction for characterizing a mass of discontinuous rock may prove applicable …

    Get Price
  • (PDF) Improved Optimization and Visualization of Drilling ...

    Improved Optimization and Visualization of Drilling Directions for Rock Mass Discontinuity Characterization. ... The optimum drilling direction is the direction along which the LSBI is minimized.

    Get Price
  • UNDERGROUND DRILLING - Tunneling Short Course

    2018-9-26u2002·u2002UNDERGROUND DRILLING DRILLING POWER • Rock drills −Drilling power from 20 hpto 34 hp(15 kW to 25 kW) −Frequency 50…100 Hz • Flushing −Water flushing [from 15 up to 30 gallons minute (60 -120 lpm)] or −Air: 150 cfm @ 150 psi(4 m3/min @10 bar) with the air mist • Max. penetration rates −6 ftm–20 ftm(2 in. hole) (2 –6 m/min ...

    Get Price
  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Drilling Parameters. The pull down force must be sufficient to fracture the rock. Excessive force causes bit wear and vibration damage to the drill. The optimum pull down depends on rock strength and bit size. For example, in a typical coal mine with a rock strength of 10 000 psi (69 MPa), the optimum pull down is about 67 kN (15 000 lb ).

    Get Price
  • Hard rock drilling problems explained by hard rock ...

    2021-10-5u2002·u2002Hard rocks are difficult to drill because of the extreme zig-zags from overpressured shales to sub-normally pressured sands and carbonates. It is impossible to drill anywhere near balanced in both situations, simultaneously. Hard rock drilling problems caused …

    Get Price
  • MAJOR FACTORS AFFECTING DRILLING PENETRATION

    2017-11-18u2002·u2002Rocks that contain gummy clays can cause the bit to ball up and drill inefficiently. The permeability of rock also affects penetration rate. In permeable rock, the drilling fluid filtrate can move into the rock ahead of the bit and equalize the pressure differential acting on the chips formed beneath each tooth and increase the penetration rate.

    Get Price
  • Influence of Weight-on-Bit on Percussive Drilling ...

    2020-9-5u2002·u2002A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. Several hypotheses have been previously proposed to explain this universal characteristic of percussive drilling, including increased wear of the bit, reduced indexing ...

    Get Price
  • Underground Drilling - International Mining

    2012-6-1u2002·u2002In this month's Spotlight Feature Article, from the pages of the June 2012 issues of International Mining, Editor Paul Moore reports that Underground Drilling remains a challenging environment, so continued improvements from key machine and component suppliers continues to help mines improve efficiency, particularly as operations go deeper.

    Get Price
  • DelPat Software rock drilling blasting • drillblasts.com

    DelPat v9. Rock drilling blasting software, better results in design. Therefore accurate drilling, good blasting, optimum fragmentation, low costs and daily recordings. Now, please see the sections below to better understand or learn about the software.

    Get Price
  • ANALYSIS OF DRILLING TOOL LIFE—A REVIEW

    2015-4-9u2002·u2002523 Int. J. Mech. Eng. & Rob. Res. 2015 Dhanraj Patel and Rajesh Verma, 2015 ANALYSIS OF DRILLING TOOL LIFE—A REVIEW Dhanraj Patel1* and Rajesh Verma2 *Corresponding Author: Dhanraj Patel, [email protected] Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section

    Get Price
  • Identifying the Optimum Drilling Direction for ...

    A method developed by Zhou and Maerz (2002) for identifying the optimum drilling direction for characterizing a mass of discontinuous rock may prove applicable …

    Get Price
  • (PDF) Improved Optimization and Visualization of Drilling ...

    Improved Optimization and Visualization of Drilling Directions for Rock Mass Discontinuity Characterization. ... The optimum drilling direction is the direction along which the LSBI is minimized.

    Get Price
  • UNDERGROUND DRILLING - Tunneling Short Course

    2018-9-26u2002·u2002UNDERGROUND DRILLING DRILLING POWER • Rock drills −Drilling power from 20 hpto 34 hp(15 kW to 25 kW) −Frequency 50…100 Hz • Flushing −Water flushing [from 15 up to 30 gallons minute (60 -120 lpm)] or −Air: 150 cfm @ 150 psi(4 m3/min @10 bar) with the air mist • Max. penetration rates −6 ftm–20 ftm(2 in. hole) (2 –6 m/min ...

    Get Price
  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Drilling Parameters. The pull down force must be sufficient to fracture the rock. Excessive force causes bit wear and vibration damage to the drill. The optimum pull down depends on rock strength and bit size. For example, in a typical coal mine with a rock strength of 10 000 psi (69 MPa), the optimum pull down is about 67 kN (15 000 lb ).

    Get Price
  • Hard rock drilling problems explained by hard rock ...

    2021-10-5u2002·u2002Hard rocks are difficult to drill because of the extreme zig-zags from overpressured shales to sub-normally pressured sands and carbonates. It is impossible to drill anywhere near balanced in both situations, simultaneously. Hard rock drilling problems caused …

    Get Price
  • MAJOR FACTORS AFFECTING DRILLING PENETRATION

    2017-11-18u2002·u2002Rocks that contain gummy clays can cause the bit to ball up and drill inefficiently. The permeability of rock also affects penetration rate. In permeable rock, the drilling fluid filtrate can move into the rock ahead of the bit and equalize the pressure differential acting on the chips formed beneath each tooth and increase the penetration rate.

    Get Price
  • Influence of Weight-on-Bit on Percussive Drilling ...

    2020-9-5u2002·u2002A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. Several hypotheses have been previously proposed to explain this universal characteristic of percussive drilling, including increased wear of the bit, reduced indexing ...

    Get Price
  • Underground Drilling - International Mining

    2012-6-1u2002·u2002In this month's Spotlight Feature Article, from the pages of the June 2012 issues of International Mining, Editor Paul Moore reports that Underground Drilling remains a challenging environment, so continued improvements from key machine and component suppliers continues to help mines improve efficiency, particularly as operations go deeper.

    Get Price
  • DelPat Software rock drilling blasting • drillblasts.com

    DelPat v9. Rock drilling blasting software, better results in design. Therefore accurate drilling, good blasting, optimum fragmentation, low costs and daily recordings. Now, please see the sections below to better understand or learn about the software.

    Get Price
  • ANALYSIS OF DRILLING TOOL LIFE—A REVIEW

    2015-4-9u2002·u2002523 Int. J. Mech. Eng. & Rob. Res. 2015 Dhanraj Patel and Rajesh Verma, 2015 ANALYSIS OF DRILLING TOOL LIFE—A REVIEW Dhanraj Patel1* and Rajesh Verma2 *Corresponding Author: Dhanraj Patel, [email protected] Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section

    Get Price