Experimental research on the influence of working parameters on the drilling efficiency

Li, Hongsheng; Liu, Songyong; Chang, Huanhuan

doi:10.1016/j.tust.2019.103174

Cited by 36 publications

(10 citation statements)

References 28 publications

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“…Additionally, the stress distribution around the roadway can be reflected by measuring the operating parameters of the drilling rig (Li et al 2020b;Zhang et al 2016a), the main ones being the hydraulic-motor inlet oil pressure (P 1 ), which makes the drill bit rotate to break the rock, and the oil-cylinder inlet oil pressure (P 2 ), which pushes the drill rod toward the bottom of the borehole. For the same coal and rock materials under the same stress, a higher drilling velocity (v) corresponds to larger drilling thrust and torque (Li et al 2020a). For the automatic hydraulic drilling rig used in these field tests, 1-m-long drill rods and drill bits with an outer diameter of 113 mm were used.…”

Section: Field Investigations Of Stress Distributions Around Roadwaysmentioning

confidence: 99%

Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

Wang

Chen

et al. 2021

Int J Coal Sci Technol

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The purpose of underground methane drainage technology is to prevent methane disasters and enable the efficient use of coal mine methane (CMM), and the sealing depth is a key factor that affects the performance of underground methane drainage. In this work, the layouts of in-seam and crossing boreholes are considered to analyze the stress distribution and failure characteristics of roadway surrounding rock through a numerical simulation and field stress investigation to determine a reasonable sealing depth. The results show that the depths of the plastic and elastic zones in two experimental coal mines are 16 and 20 m respectively. Borehole sealing minimizes the air leakage through the fractures around the roadway when the sealing material covers the failure and plastic zones, and the field test results for CMM drainage at different sealing depths indicate that the CMM drainage efficiency increases with increasing sealing depth but does not change once the sealing depth exceeds the plastic zone. Moreover, sealing in the high-permeability roadway surrounding rock does not have a strong influence on the borehole sealing performance. Considering these findings, a new CMM drainage system for key sealing in the low-permeability zone was developed that is effective for improving the CMM drainage efficiency and prolonging the high-concentration CMM drainage period. The proposed approach offers a valuable quantitative analysis method for selecting the optimum sealing parameters for underground methane drainage, thereby improving considerably the drainage and utilization rates of CMM.

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Section: Field Investigations Of Stress Distributions Around Roadwaysmentioning

confidence: 99%

Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

Wang

Chen

et al. 2021

Int J Coal Sci Technol

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“…The main control objective for any effective drill-string control strategy is to minimise (ideally eliminate) the damaging stick-slip oscillations and guide the system into a state of constant drilling where possible [46,47]. The MIRC-based damping scheme with Tracking Control is a combination of four gains with a desired reference variable viz: the Output gain λ, the Feed-Through gain κ and the Integrator gain η, which are all connected to an Integrator belonging to the MIRC; as depicted in Fig.…”

Section: Modified Integral Resonant Control-based Damping With Integral Tracking Featuring Delay and Constraintsmentioning

confidence: 99%

Feedback control method to suppress stick-slip in drill-strings featuring delay and actuation constraints

MacLean

Vaziri

Aphale

et al. 2021

Eur. Phys. J. Spec. Top.

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In this work, performance of a modified-integral resonant controller with integral tracking is investigated numerically under the effects of actuator delay and actuation constraints. Actuation delay and constraints naturally limit controller performance, so much so that it can cause instabilities. A 2-DOF drill-string m with nonlinear bit–rock interactions is analysed. The aforementioned control scheme is implemented on this system and analysed under the effects of actuation delay and constraints and it is found to be highly effective at coping with these limitations. The scheme is then compared to sliding-mode control and shows to be superior in many regimes of operation. Lastly, the scheme is analysed in detail by varying its gains as well as varying system parameters, most notably that of actuation delay.

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“…На основе теоретических исследований взаимодействия лопастного и шарошечного долот c мерзлым грунтом [16,17,18,19,20,21,22] и полученных теоретических исследований взаимодействия винтового бура с мерзлым грунтом был проведен сравнительный анализ для определения эффективности винтового бура по алгоритму (рисунок 1). Первым этапом происходило определение оценки эффективности бурения по способу реа-…”

Section: материалы и методыunclassified

Сomparative analysis of efficiency of use a screw drill on frozen soil

Мартюченко

Зенин

2021

Vestn. SibADI

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Introduction. Drilling of frozen and permafrost soils is one of the complex and energy-intensive processes of earthworks. Drilling tools used on frozen soils implement the process of drilling the soil by deformation of cutting or crushing action. Current drilling tools are not efficient enough to use because they implement energy-intensive drilling processes and are not always suitable for various types of soils. A screw drill is considered, which implements the process of soil destruction by shear and shear deformation, which is less energy intensive.Materials and methods. On the basis of theoretical studies of the interaction of 3 types of drilling tools with frozen soil, a comparative analysis was carried out to determine the efficiency of a screw drill use. The technical and economic indicators of the drilling process were compared. A method for determining the efficiency of the use a screw drill based on the analysis of special target functions is presented.Results. The results of a comparative analysis of drilling tools have been obtained. Depending on the nature of soil deformation, the effectiveness of one drilling tool over another is determined. As a result of a comparative analysis of the drilling speed and the energy intensity of the drilling process, the efficiency of the screw drill was established.Discussions and conclusion. In the course of the comparative analysis, the efficiency of the screw drill was determied, which implements shear deformation and soil separation, justifying the feasibility of further research.

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Experimental research on the influence of working parameters on the drilling efficiency

Cited by 36 publications

References 28 publications

Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

Feedback control method to suppress stick-slip in drill-strings featuring delay and actuation constraints

Сomparative analysis of efficiency of use a screw drill on frozen soil

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