The relationships between Drilling Rate Index (DRI), physico-mechanical properties and specific cutting energy for some carbonate rocks

2013 ◽  
pp. 867-873 ◽  
Author(s):  
G Ekincioglu ◽  
R Altindag ◽  
N Sengun ◽  
S Demirdag ◽  
A Guney
Keyword(s):  
Mechanical Properties ◽  
Carbonate Rocks ◽  
Specific Cutting Energy ◽  
Drilling Rate ◽  
Cutting Energy ◽  
Drilling Rate Index

Evaluation of physical and mechanical properties of rock for drilling condition classification

2013 ◽  
Vol 10 (4) ◽  
pp. 359-366 ◽  
Author(s):  
B. Adebayo ◽  
B. Adetula
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Point System ◽  
Drilling Rate ◽  
Quartz Content ◽  
Drilling Condition ◽  
Drilling Rate Index

This work deals with the investigation of physical and mechanical properties of selected rocks for condition of drilling categorization. Rock samples collected from five drilling locations were tested in the laboratory for uniaxial compressive strength, tensile strength, and Drilling Rate Index (DRI) using 1,100 kN compression machine, point load tester and miniature drill. Similarly, hardness, brittleness, Rock Abrasivity Index (RAI), penetration rate and bit wear rate were determined. The results showed that uniaxial compressive strength, tensile strength and Drilling Rate Index varied from 47.78 - 111.11 MPa, 8.09 - 19.44 MPa, and 20 - 52 respectively. The Nast point system chart was used to classify the rocks into drilling conditions. The drilling classification shows that the drilling condition of the rocks varied from slow to fast. The drillability characteristics of the rocks vary from extremely low to medium as specified by the Drilling rate Index (DRI). It was concluded that uniaxial compressive strength, texture and grain size, drilling rate index and Equivalent Quartz Content (EQC) are important parameters affecting drilling condition of the rocks.

Milling Parameter Selection to Lower Specific Cutting Energy During Machining of Alloy Steels

2020 ◽  
Author(s):  
Sudeep Kumar Singh ◽  
Adarsha Arijit Sahoo ◽  
Biswojit Pattnayak ◽  
Biswo Bhushan Tarai ◽  
A.M. Mohanty
Keyword(s):  
Parameter Selection ◽  
Specific Cutting Energy ◽  
Cutting Energy ◽  
Alloy Steels

Comparison of Rotary and Linear Cutting Methodology in Determining Specific Cutting Energy of Granite

2021 ◽  
pp. 1-19
Author(s):  
Aamer Kazi ◽  
Yi-Tang Kao ◽  
Bruce Tai
Keyword(s):  
Linear Method ◽  
Cutting Speed ◽  
Polycrystalline Diamond ◽  
Specific Cutting Energy ◽  
Cnc Machine ◽  
Cutting Method ◽  
Cutting Energy ◽  
The Difference ◽  
Geothermal Drilling ◽  
Chip Load

Abstract Single polycrystalline diamond compact (PDC) cutting is a practical technique to understand the rock-tool interactions in drag-bit type geothermal drilling operations. This paper introduces a rotary cutting method to determine specific cutting energy (SCE) and compares it with the conventional linear cutting method. In this work, granite is selected to represent hard rock formations in geothermal drilling. Cutting tests are conducted on a CNC machine with a realistic cutting speed of 12.7 m/min and several chip loads ranging from 0.08 to 0.25 mm. The cutting force is measured using a dynamometer, and then converted to SCE. The results show that the rotary method produces an inverse relationship between SCE and chip load, whereas the linear method shows the opposite. As a result, the produced SCE by the rotary method tends to be lower than that of the linear method at a higher chip load at and over 0.16 mm. The difference may be attributed to the cutting configuration and associated force components.

Experimental research on deterioration of mechanical properties of carbonate rocks under acidified conditions

2020 ◽  
Vol 185 ◽  
pp. 106612
Author(s):  
Hao Zhang ◽  
Ying Zhong ◽  
Jiang Zhang ◽  
Yongchun Zhang ◽  
Jianchao Kuang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
Carbonate Rocks

scholarly journals Analysis and modeling of the effects of process parameters on specific cutting energy in abrasive water jet cutting

2018 ◽  
Vol 22 (Suppl. 5) ◽  
pp. 1459-1470 ◽  
Author(s):  
Predrag Jankovic ◽  
Milos Madic ◽  
Dusan Petkovic ◽  
Miroslav Radovanovic
Keyword(s):  
Mathematical Model ◽  
Process Parameters ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Specific Cutting Energy ◽  
Important Indicator ◽  
Cutting Energy ◽  
Water Jet Cutting ◽  
Abrasive Water Jet Cutting ◽  
The Impact

The problem of cutting difficult-to-machine materials used in the aerospace industry, aircraft industry, and automobile industry, led to the development and application one of today?s most attractive technology for contour cutting - abrasive water jet cutting. For the efficient use of abrasive water jet cutting, it is of great importance to analyze the impact of process parameters on performance indicators, such as cutting quality, productivity, and costs. But also, from the energy utilization point of view, it is very important to analyze the impact of these parameters on the specific cutting energy which represents the amount of energy spent on the removal of material in the unit time. Having this in mind, this study presents the experimental results of abrasive water jet cutting of aluminum alloy with the aim of creating a mathematical model for estimating specific cutting energy as an important indicator of the degree of utilization of the available energy in the cutting process. The mathematical model of the specific cutting energy is explicitly represented as a non-linear function of the process parameters, obtained by the artificial neural network.

A Theoretical Description of Rotary Drilling for Idealized Down-Hole Bit/Rock Conditions

1969 ◽  
Vol 9 (04) ◽  
pp. 443-450 ◽  
Author(s):  
Paul F. Gnirk ◽  
J.B. Cheatham
Keyword(s):  
Mechanical Properties ◽  
Rate Equation ◽  
Chip Formation ◽  
Confining Pressure ◽  
Drill Hole ◽  
Differential Pressure ◽  
Drilling Rate ◽  
Rotary Drilling ◽  
Rock Interaction ◽  
Rock Bit

Abstract The results of combined analytical and experimental studies involving simulated multiple bit-tooth penetration into rock are incorporated into a drilling rate equation for roller-cone bits assuming rather idealized downhole conditions. In particular, it is assumed That the rock behaves statically in a ductile fashion during bit-tooth penetration and that the rock chips are instantaneously removed from the bottom of the drill hole. The general analysis demonstrates an application of plasticity theory for the rock/bit-tooth interaction to The formulation of an upper limit on rotary drilling rate. Introduction Extensive experimentation involving single and indexed bit-tooth penetration into rock in a confining pressure environment has demonstrated that the pressure environment has demonstrated that the chip formation process is of a ductile, or pseudoplastic, nature at sufficiently low differential pseudoplastic, nature at sufficiently low differential pressures so as to be of interest in rotary drilling. pressures so as to be of interest in rotary drilling. Coincident with the experimentation, analytical consideration has been given to the theoretical problems of single and indexed bit-tooth penetration problems of single and indexed bit-tooth penetration into rock. In general, the analyses have assumed that the rock behaves statically in a rigid-plastic fashion and obeys the Mohr-Coulomb yield criterion. The quantitative comparison between experimental and calculated values of bit-tooth load required for chip formation has been remarkably good for a variety of rocks commonly encountered in drilling and at simulated differential pressures as low as 500 to 1,000 psi. Results obtained recently for indexed bit-tooth penetration indicate that the work (or energy) penetration indicate that the work (or energy) required to produce a unit volume of rock chip can be minimized by a proper combination of bit-tooth spacing and bit-tooth load for a given rock type and differential pressure. By utilizing this information, it is possible co formulate a drilling rate equation, at least in a preliminary fashion, for a roller-cone bit performing under rather idealized downhole conditions. In particular, through the use of characteristic dimensionless quantities pertinent to a roller-cone bit and to indexed bit-tooth penetration, interrelationships among bit weight, rotary speed, rotary power, bit diameter, rock strength and bit-tooth shape and spacing can be explicitly expressed. In the formulation of the equations, however, it is assumed that the rock chips are instantaneously removed from the bottom of the drill hole and that the rock behaves in a ductile manner during bit-tooth penetration. In addition, the effects of bit-tooth load application And penetration by a yawed tooth at an oblique angle are neglected. Although the analysis is presented in the light of some rather restrictive conditions, it does demonstrate a method of applying fundamental rock/bit-tooth interaction data, obtained by combining the results of analysis and experiment to the formulation of a drilling rate equation for rotary drilling. INDEXED BIT-TOOTH/ROCK INTERACTION PREVIOUS RESULTS PREVIOUS RESULTS The mechanics of bit-tooth/rock interaction under simulated conditions of borehole environment have been extensively described in a number of papers. In particular, the effects of differential papers. In particular, the effects of differential pressure, mechanical properties of rock, pore fluid, pressure, mechanical properties of rock, pore fluid, bit-tooth shape and spacing, rate of bit-tooth load application and dynamic filtration below the bit-tooth have been investigated experimentally. From a sequence of experiments, it was demonstrated that, for dry rock at atmospheric pore pressure, the mode of chip formation exhibits a transition, with increasing confining pressure, from predominantly brittle to predominantly ductile. SPEJ P. 443

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