An experimental study of the effect of back rake angle in rock cutting

Rostamsowlat, Iman; Richard, Thomas; Evans, Brian

doi:10.1016/j.ijrmms.2018.04.046

Cited by 35 publications

(9 citation statements)

References 19 publications

(19 reference statements)

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“…Firstly, the uniaxial compressive strength (UCS) and internal friction angle are estimated by continuous scratch test with a sharp cutter and blunt cutter. The detailed principle and procedure are demonstrated by previous studies [30][31][32][33]. In addition, the Mohr-Coulomb criterion (as shown in Equation ( 1)), which reveals the relation between UCS, internal friction angle and cohesive strength is adopted to obtain the cohesive strength (inhibition index) in this study.…”

Section: Methods Of Hydration Characterization Of Deep Mudstonementioning

confidence: 99%

A Quantitative Evaluation Method of Anti-Sloughing Drilling Fluid Inhibition for Deep Mudstone

Jin

et al. 2022

Energies

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Wellbore instability resulting from deep mudstone hydration severely restricts the development of oil and gas resources from deep reservoir in western China. Accurate evaluation of drilling fluid inhibition properties plays an important role in selecting drilling fluid that can control deep mudstone hydration and then sustain wellbore stability. The previous evaluations are conducted by qualitative analysis and cannot consider the influence of complex hydration conditions of deep mudstone (high temperature, high pressure and flushing action). The study proposes a quantitative method to evaluate drilling fluid’s inhibition property for deep mudstone under natural drilling conditions. In this method, the cohesive strength of mudstone after hydration is adopted as the inhibition index of the tested drilling fluid. An experimental platform containing a newly designed HPHT (High pressure and high temperature) hydration experiment apparatus and mechanics characterization of mudstone after hydration based on scratch test is proposed to obtain the current inhibition index of tested drilling fluid under deep well drilling environments. Based on the mechanical–chemical wellbore stability model considering strength weakening characteristics of deep mudstone after hydration, a cross-correlation between drilling fluid density (collapse pressure) and required inhibition index (cohesive strength) for deep mudstone is provided as the quantitative evaluation criterion. Once the density of tested mud is known, one can confirm whether the inhibition property of tested mud is sufficient. In this study, the JDK mudstone of a K block in western China is selected as the application object of the proposed evaluation method. Firstly, the evaluation chart, which can demonstrate the required inhibition indexes of the tested fluids quantitatively with various densities for JDK mudstone, is constructed. Furthermore, the experimental evaluations of inhibition indexes of drilling fluids taken from two wells in K block are conducted under ambient and deep-well drilling conditions, respectively. In order to show the validity and advantage of the proposed method, a comparison between the laboratory evaluation results and field data is made. Results show that the laboratory evaluation results under deep-well drilling conditions are consistent with the field data. However, the evaluation under ambient conditions overestimates the inhibition property of the tested fluid and brings a risk of wellbore instability. The developed quantitative method can be a new way to evaluate and optimize the inhibition property of drilling fluid for deep mudstone.

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Section: Methods Of Hydration Characterization Of Deep Mudstonementioning

confidence: 99%

A Quantitative Evaluation Method of Anti-Sloughing Drilling Fluid Inhibition for Deep Mudstone

Jin

et al. 2022

Energies

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“…3). The interface friction angle (u) characterizes the frictional interaction between the cutter's rake face and the rock [28].…”

Section: Numerical Modelmentioning

confidence: 99%

Composite rock-breaking of high-pressure CO2 jet & polycrystalline-diamond-compact (PDC) cutter using a coupled SPH/FEM model

Cai

Zhang

et al. 2022

International Journal of Mining Science and Technology

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“…In order to enhance cutting performance and machine life, it is very important to reveal the fracture mechanism of rocks and estimate the cutting force in the rock cutting process. The mechanism of rock cutting with PDC cutters has been investigated in numerous pieces of scientific literature [1][2][3][4][5][6][7][8][9][10][11]. Since the cutting depth is shallow, typically less than 1 mm for a medium strength sandstone [12], and the rake angle is negative (or the back rake angle is positive), the ductile fracture regime usually happens in rock cutting with PDC cutters [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…In the ductile fracture regime, the cutting force is proportional to the sectional area of the groove [6,12,13,15]. The ratio of the cutting force to the sectional area of the groove is the intrinsic energy, which is found well correlated with the uniaxial compressive strength (UCS) [4,12,16]. Therefore, the cutting force can be estimated by multiplying the sectional area of the groove and the UCS of the rock.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Model for Rock Cutting with a Chisel Pick of the Cutter Suction Dredger

Ouyang

Yang

Chen

et al. 2020

JMSE

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Cutter suction dredgers are important pieces of rock excavation equipment in port and waterway construction. It is valuable but difficult to properly estimate the cutting force on the chisel pick of the cutter suction dredger. In this paper, an analytical model, called the crushed zone expansion induced tensile failure model (CEIT model), is proposed for rock cutting with a chisel pick in order to predict the peak cutting force (Fc) more accurately. First, a review of the existing models for rock cutting with a chisel pick is presented. Next, based on the tensile breakage theory, cavity expansion theory and some hypotheses, the mathematical formula of the CEIT model is obtained. Different from that in the previous models, the effect of the rock on both sides of the chisel pick on Fc, defined as the sidewall effect is considered in the CEIT model. Then, the predicted Fc by the CEIT model is compared with the predicted Fc by existing theoretical models and experimental results to check the validity of the CEIT model. The results show that the CEIT model can well capture the relationships of Fc to the cutting parameters, including cutting width, cutting depth, and rake angle, and can predict the experimental results much better than the existing models. Finally, the sidewall effect and its influence factors according to the CEIT model are discussed.

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An experimental study of the effect of back rake angle in rock cutting

Cited by 35 publications

References 19 publications

A Quantitative Evaluation Method of Anti-Sloughing Drilling Fluid Inhibition for Deep Mudstone

A Quantitative Evaluation Method of Anti-Sloughing Drilling Fluid Inhibition for Deep Mudstone

Composite rock-breaking of high-pressure CO2 jet & polycrystalline-diamond-compact (PDC) cutter using a coupled SPH/FEM model

An Analytical Model for Rock Cutting with a Chisel Pick of the Cutter Suction Dredger

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