A theory of percussive drill bit penetration

Dutta, P.

doi:10.1016/0148-9062(72)90044-7

Cited by 32 publications

(9 citation statements)

References 3 publications

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“…Even though actual rock drill components were used in this study, the authors believe that the curves are more precise than those with the standard rod-bit system in Carlsson et al [10], in which large fluctuations were observed near the origin. Previous studies showed that the forcepenetration curves for granite in static penetration tests with a button tip [14] and a conical tip [15,16] are not smooth due to rock chipping in comparison with the curves in Fig. 11(c).…”

Section: Force-penetration Curvesmentioning

confidence: 78%

Force-penetration curves of a button bit generated during impact penetration into rock

Hashiba

Fukui

Liang

et al. 2015

International Journal of Impact Engineering

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Section: Force-penetration Curvesmentioning

confidence: 78%

Force-penetration curves of a button bit generated during impact penetration into rock

Hashiba

Fukui

Liang

et al. 2015

International Journal of Impact Engineering

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“…During the process of mining assisted by an HPW jet, the first slots of a give g were made in relation to the disc tool axis on one half of the circumference of the with radius Ru, and next, at a different depth on the other half of the circumfere slots depth, g, ranged from 7.5 to 15.0 mm, whereas their spacing 2B was within t of 0.75-1.75 of the theoretically calculated width of the cut W, according to the t disc tool edge penetration presented by Dutta and Marianowski [26,27].…”

Section: Results Of Mining Tests With a Disk Tool Without And With Hpw Jet Assistancementioning

confidence: 97%

Hard Rock Mining Using Disk Tools Supported by High-Pressure Water Jets in the Aspect of Reducing Energy Consumption

Kotwica

2021

Energies

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The mining of hard rocks by mechanical methods, using cutting tools, is associated with problems such as sparking, dust generation and increased wear. The application of disk tools allows limiting these problems but requires constructing a machine with large dimensions and weight. To limit these problems, high-pressure water jets can be applied. The article presents the effects of using this solution in the field and stand tests when mining rocks with a symmetrical disk. The results of the bench tests of high-pressure water jets to support the process of mining with symmetrical disks, carried out at the AGH University of Science and Technology, performed on a unique test stand, which enabled the samples to be mined in a circular trajectory in conditions similar to real ones, are presented. With the use of a dimensional analysis, a theoretical-empirical model was developed to estimate the impact of slots cut by water jets on the tool load and the amount of output as a function of slots spacing and depth. Considering the similarity criteria for the mined rock sample (mechanical properties), it is possible, with the use of this model, to estimate the most advantageous working parameters while hydromechanical mining uses disks on a larger cutting radius.

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“…When the orifice is reduced, which is the ratio of the cross-section of the drill bit to the cross-section of the nozzles, the velocity of the drilling fluid flow is increased significantly. The increasing velocity of the drilling fluid has a positive effect on the flow of the drilling fluid around the rollers, which effectively removes the drilled rock particles from the bottom of the borehole and contributes to the fracture of the borehole, especially in the softer, poorly bonded rocks [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The roller cone bit with steel teeth, which is investigated here, is used in softer, poorly bonded rock formations.…”

Section: Drilling Principle Of the Roller Cone Drill Bitmentioning

confidence: 99%

Characterisation of the Wear of the Roller Cone Drill Bit Caused by Improperly Chosen Drilling Regime

Šporin

2020

Materials and Geoenvironment

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The rapid drop in the penetration rate or failure of the drill bit during the drilling process delays the drilling process. In our investigation, the ‘in situ’ drilling parameters were monitored during the drilling process along with the roller cone drill bit, which is suitable for drilling in soft rock formations (IADC 136). The drill bit was thoroughly examined to determine its damage and wear occurred during drilling along with decreasing penetration rate. The modern and standardised investigation methods were used to analyse the rock materials and the micro- and macro-structure of the materials of the roller cone bit. The analyses were performed by means of optical and electron microscopes, simultaneous thermal analysis of the steel materials, analysis of the chemical composition of the materials of the drill bit and determination of the geomechanical parameters of the drilled rock. The resulting wear, localised fractures and cracks were quantitatively and qualitatively defined and the parameters were correlated to the drilling regime and the rock material. The results of our investigation of the material of the roller cone bit can serve as a good basis for the development of new steel alloys that can withstand higher temperatures and allow effective drilling without structural changes of the steel material.

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A theory of percussive drill bit penetration

Cited by 32 publications

References 3 publications

Force-penetration curves of a button bit generated during impact penetration into rock

Force-penetration curves of a button bit generated during impact penetration into rock

Hard Rock Mining Using Disk Tools Supported by High-Pressure Water Jets in the Aspect of Reducing Energy Consumption

Characterisation of the Wear of the Roller Cone Drill Bit Caused by Improperly Chosen Drilling Regime

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