A new approach to rock brittleness and its usability at prediction of drillability

Özfırat, M. Kemal; Yenice, Hayati; Şimşir, Ferhan; Yaralı, Olgay

doi:10.1016/j.jafrearsci.2016.03.017

Cited by 42 publications

(12 citation statements)

References 14 publications

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“…Saeidi et al [7] studied 38 in situ drillings in porphyry andesite, limestone, and sandstone, and found that the UCS of rock, the vertical pressure on bit, and bit rotational speed were the most significant parameters in the penetration rate for rotary drilling. Özfırat et al [8] experimented on 42 rocks of different types and found that DRI showed strong correlations with UCS and BTS. Yetkin et al [1] used schist samples and found a strong relationship between DRI, UCS, BTS, Schmidt hardness (SH), instantaneous cutting rate (ICR), unit weight, rock mass rating (RMR), and the Cerchar abrasiveness index (CAI).…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

et al. 2021

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This work evaluates the effect of high temperatures and cooling methods on the drillability of Prada limestone. Samples from boreholes drilled during the design stage of the Tres Ponts Tunnel in the Catalan south Pyrenean zone (Spain) were subjected to temperatures of 105, 200, 300, 400, and 600 °C, and then cooled at a slow rate or by quenching. Sievers’ J-value (SJ) and brittleness (S20) were determined on thermally treated samples, and the drilling rate index (DRI) was calculated for each temperature. The results show that thermal treatment implied a sustained increase in the drillability of the rock of up to 40% at 600 °C and a change in the drillability category (from medium to high). At 600 °C, SJ and S20 tripled and doubled, respectively, the initial values obtained for the intact rock. The results were inconclusive about the influence of the cooling method on the drilling performance of Prada limestone for the tested range of temperatures. The substantial improvement observed in the drillability of Prada limestone when heated, measured in terms of DRI, could help in the development of novel thermally-assisted mechanical excavation methods. Additionally, strong correlations between drillability variables (i.e., SJ and S20) and physical and mechanical variables of Prada limestone (i.e., P- and S-wave velocities, uniaxial compression strength, elastic modulus, and Poisson’s ratio) are proposed. Correlations will help make preliminary predictions of drillability based on properties such as uniaxial compression strength and ultrasound wave velocities.

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Section: Introductionmentioning

confidence: 99%

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

et al. 2021

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“…Brittleness is a critical indicator for hydraulic fracturing candidate screening in unconventional reservoirs. It is more practical to estimate brittleness on the basis of mechanical properties of the rock 22,23 . The brittleness evaluation parameters such as Young's modulus, Poisson's ratio and Lame's parameters can be directly quantified through extracted rock elastic properties.…”

Section: Methodsmentioning

confidence: 99%

Effective Attributes Quantification to Bridge Gap between Elastic Properties and Reservoir Parameters in Self-Resource Rocks

Abid

Geng

2020

Sci Rep

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The successful production of unconventional resources such as shale gas is highly dependent on its two reservoir properties, organic matter and rock brittleness. High resolution spatially characterization of these two unconventional reservoir properties needs surface reflection seismic data. However, to delineate these two parameters on seismic scale is a challenging task because poor correlation is observed between these parameters and elastic properties of the rock. To encounter this adversity in current study we proposed effective attributes method in which organic shale reservoir properties are divided into their hard and soft elastic response. From the analysis of worldwide laboratory dataset, we find that hard and soft components have shown us much better linear correlation with P-and S-wave impedance. The proposed effective attributes, helped us to reduce the gap between unconventional reservoir properties and seismic characteristics. These attributes are the main controlling factor for rock elastic properties and exhibit information about hydrocarbon generation capacity and rock brittleness. A well data example from Sembar shale has also shown successful results for proposed effective attributes methodology. These attributes application on inverted P-wave impedance seismic data of employed organic shale reservoir have shown productive results to quantify its unconventional prospect on seismic scale. The approach used in this study can be confidently employed to assess unconventional reservoir potential in other parts of the world.

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“…Uncontrollable factors are geological variables, geomechanical properties of rock and rock mass properties. Most researchers have studied on drilling rate index for selection of the most proper excavation or drilling machine and investigated the relationship between rock mechanical properties and drilling rate index (Thuro 1997, Tumac et al 2007, Altindag 2002, Kahraman 2002, Dahl 2003, Hoseinie et al 2008, Moein et al 2014, Ceryan 2014, Ataei et al 2015, Taheri et al 2016, Ozfirat et al 2016, Yaralı 2017, Yetkin et al 2016, Rostami & Chang 2017, Yenice et al 2018.…”

Section: Introductionmentioning

confidence: 99%

Examining of rock drilling properties in underground metal mine excavation

Yetkin

2021

An. Acad. Bras. Ciênc.

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In underground metal mines, drilling and blasting is widely used production method. Drilling holes is especially a time consuming operation. The aim of this study is to examine and analyze drilling operation and its duration in underground ore and dead rock. Drillability experiments are carried out on samples taken from the field. In core sampling two different types of core samples are taken whether it is parallel or perpendicular to ore bedding and dead rock. Results of drillability experiments are compared between the two types of core samples. DRI values are found to be 51 and 47 for the parallel and perpendicular core samples to ore bedding, respectively. DRI values for the parallel and perpendicular core samples to dead rock bedding are found to be 57 and 55 for the, respectively. In addition, graphs of drilling speed and drilling depth belonging to ore and dead rock are analyzed. It is examined that drilling speed increases steadily to maximum point in the first 5sec. and stays stable after that point. Therefore, it is concluded that production galleries and holes which are formed parallel to bedding would increase production efficiency.

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A new approach to rock brittleness and its usability at prediction of drillability

Cited by 42 publications

References 14 publications

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

Effective Attributes Quantification to Bridge Gap between Elastic Properties and Reservoir Parameters in Self-Resource Rocks

Examining of rock drilling properties in underground metal mine excavation

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