Variation of vertical and horizontal drilling rates depending on some rock properties in the marble quarries

Demirdag, S.; Sengün, N.; Ugur, I.; Efe, Tamer; Akbay, Deniz; Altındağ, R.

doi:10.1016/j.ijmst.2014.01.020

Cited by 32 publications

(6 citation statements)

References 11 publications

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“…Calculating the optimal tensions for splitting blocks from massif is also important to analyze the micro-cracking process. Particularly this analysis can be found in the following work [9,10], where are described the micro-cracking process and analysis of mechanical features of rocks during splitting [11]. The crack creation and the process of further formation of cracks are described by Huang et al [12].…”

Section: Statement Of the Problemmentioning

confidence: 99%

Research of borehole drilling parameters for determining the optimum size of granite stone blocks

Panasiuk,

Davydova,

Shlapak

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The optimal geometrical parameters of boreholes in dimension stone quarries, whose impact on granite blocks separation and splitting efficiency, are determined, taking into account the stress-deformed state of rock massif. The crack initiation process is analysed considering the flat problem of elasticity theory. Determine destruction parameters of natural stone by borehole methods using the calculations of the required distance between the boreholes in the row along the splitting line with the specified borehole diameters, and created forces of stone destruction are proposed. The optimal shape of splitting block from massif depends on the specific plane of splitting is determined. The possible directions of borehole deviation from ideal ones, their extension due to drilling and tensions in the boreholes are studied. The introduction of the borehole’s overlapping coefficient, which influences the weakening of the massif along the directed (designed) split line, is proposed to define further necessary tensions for mechanical ways of separating blocks. The equations for determining drilling operations parameters at granite blocks splitting from dimension stone quarries massifs are proposed. The coefficient of limit values of deviation angles is defined.

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Section: Statement Of the Problemmentioning

confidence: 99%

Research of borehole drilling parameters for determining the optimum size of granite stone blocks

Panasiuk,

Davydova,

Shlapak

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…There are very few examples of directional drilling pertaining to complex formations. One of the basic studies on directional drilling (Servet et al 2014) is limited to two extreme vertical and horizontal angles and that too to a depth of 5 m in both the directions in lab scale experiments. Understanding of the bottom hole assembly (BHA) behavior and bit, formation interactions in such drilling conditions are stressed (Walker 1986) for achieving optimum drilling in such conditions.…”

Section: Article Highlightsmentioning

confidence: 99%

Investigations on the influence of rock and machine characteristics on coring rates in vertical and mildly inclined exploration drilling in complex coal bearing rock formation

Alam¹,

Raina²,

Murthy

2021

Geomech. Geophys. Geo-energ. Geo-resour.

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Resource characterization and modelling are important in exploration wherein cores of rock are extracted from the surface. Such cores not only help to assess the quantity and quality of the mineral or ore but also provide means to establish an excavation and ground control regime for different types of mining. Prediction of coring rate assumes critical importance for planning the coal mines which have fragile nature of ground posing challenges in strata control and excavation performance. Coring rate or associated rock factors characterize the rockmass to help in this regard. In line with the above need, the geological and machine performance data of two representative boreholes drilled at 90°and 80°in a complex coal bearing strata were collected covering drill machine variables, penetration rates and physico-mechanical properties of the rock cores in laboratory. The penetration rate showed significant deviation up to a depth of 250 m from the surface in both the holes. The variation in penetration rate was 28% in basalt and 38% in mudstone, 16% in sandy shale with coal, 10% in sandy shale and -2% in medium to coarse grained sandstone. In order to model the penetration rate, a rock designation factor was devised in terms of the depth, tensile strength and density of the rockmass. The rock designation factor along with other machine variables were analyzed initially using PCA enabled Gaussian progression method which helped in model refinement and selection of best variables. Subsequently, response surface analysis of selected variables viz., rock designation factor, torque, drill fluid pressure and RPM, using multivariate non-linear ANOVA with backpropagation method to develop a penetration rate model. Drill angle and rock type were retained as categorial factors. The model thus devised was evaluated using various techniques and resulted in RMSE of 8.1, MAE of 5.59, MSE of 65.61 with predicted R 2 of 0.927. The intercepts for different rocks analyzed were thus enumerated. The model developed can be used for defining penetration rates for the type of drill investigated. Explicit surface response with variations in different variables could thus be defined along with the relative sensitivity of the variables entering into the interaction with perturbation method. Also, a variation of 50 mm/min in penetration rates in 90°and 80°drilling is accounted by the model. The penetration

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“…These factors include drilling parameters (Akin and Karpuz 2008), lithological classification (Tanaino 2005), and the correlation between rock attributes and drilling aspects (Li et al 2016). Some studies have singled out the Uniaxial Compressive Strength (UCS) as a primary parameter affecting drilling operations (Akün and Karpuz 2005), while others have emphasized the significance of Schmidt hardness index and Brazilian tensile strength (BTS) (Servet et al 2014). Geological factors that impact drilling operations, such as water levels, quartz formation, weathering, and so on, have been investigated as well (Saeidi et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Increasing Drilling Efficiency: Rock Drillability Assessment with Improved Reliability Methods

Fattahi,

Jiryaee

2024

Preprint

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The assessment of a successful and cost-effective drilling operation hinges on the evaluation of the Drilling Rate Index (DRI). Moreover, the DRI's value, subject to fluctuations driven by various rock parameters, remains beyond control, introducing an element of unpredictability. Consequently, deterministic methods prove inadequate for the analysis of rock drillability. Nonetheless, the reliability analysis, which incorporates the uncertainty surrounding these parameters while addressing the problem, offers the advantage of providing assessments that better align with real-world conditions. In this study, rock drillability was appraised by employing various reliability methods, including the First Order Reliability Method (FORM), Monte Carlo Simulation (MCS), and the Second Order Reliability Method (SORM). Additionally, Genetic Algorithm (GA) was employed in the optimization processes associated with these methods. A critical aspect within reliability methods concerns the definition of the Limit State Function (LSF), which, in this context, is articulated using the Group Method of Data Handling (GMDH) neural network approach, yielding an explicit function. In this approach, the random variables include Brazilian Tensile Strength (BTS), Uniaxial Compressive Strength (UCS), axial point load strength index (Is(50)↓), diametral point load strength index (Is(50)→), and Shore Scleroscope Hardness (SSH), while the DRI serves as the output parameter. To evaluate the efficacy of the proposed reliability methods, field datasets from previously published literature were employed. Lastly in this paper, according to the US Army Corps of Engineers, the probability of failure (PF) calculated using the FORM, SORM, and MCS methods is low.

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Variation of vertical and horizontal drilling rates depending on some rock properties in the marble quarries

Cited by 32 publications

References 11 publications

Research of borehole drilling parameters for determining the optimum size of granite stone blocks

Research of borehole drilling parameters for determining the optimum size of granite stone blocks

Investigations on the influence of rock and machine characteristics on coring rates in vertical and mildly inclined exploration drilling in complex coal bearing rock formation

Increasing Drilling Efficiency: Rock Drillability Assessment with Improved Reliability Methods

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