scholarly journals Kinetic criteria for evaluating the performance of roller-cone drill bits

2021 ◽  
Vol 1 (7) ◽  
pp. 92-98
Author(s):  
Oleg G. Blinkov ◽  
Keyword(s):  
Comparative Evaluation ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Rock Cutting ◽  
Geometrical Parameters ◽  
Drill Bit ◽  
Kinetic Characteristics ◽  
Drill Bits ◽  
Key Points ◽  
Cone Drill

Research objective is to work out a method of evaluating the performance of roller-cone drill bits by kinetic criteria. Introduction. It is difficult to determine the absolute criteria for the performance of rock cutting tools. Therefore, the relative values of wear resistance of the cutting structure of roller-cone bits and their relative mechanical rates of drilling are adopted as process criteria. Methods of research. The calculation and analysis of kinetic criteria for evaluating the performance of drill bits have significant differences. Taking them into account is important when studying various modifications of rock cutting tools. The set of kinetic criteria gives a picture of the relative performance of the bit using the model of the well bottom close to the real one. The set of kinetic characteristics (criteria) is conventionally called the kinetic datasheet of the drill bit. The key points of constructing an analytical model of the drill bit operation on the deformable well bottom have been considered. Scope of results. This technique provides for a comparative evaluation of roller-cone drill bits of various modifications, allows for finding feedback, i.e. searching for the appropriate combination of geometrical parameters of the rock cutting tool according to given kinetic characteristics. The versatile approach intended for use in the study of the performance of rock cutting tools allows the most complete and accurate evaluation of the influence of one factor or another on the final result.

Improvement of Tool Life of a Commercial Drill Bits by Cryogenic Treatment While Machining Widmanstatten Ti-6Al-4V.

2021 ◽  
Author(s):  
Abdullah Sert ◽  
Fatih Hayati ÇAKIR
Keyword(s):  
Tool Wear ◽  
Tool Life ◽  
Cutting Forces ◽  
Cutting Tool ◽  
Cryogenic Treatment ◽  
Cutting Tools ◽  
Drill Bit ◽  
Deep Cryogenic Treatment ◽  
Drill Bits ◽  
Stereo Microscope

Abstract In this study, the performance of Ø 8 mm WC-Co (10%) drill bits with a TiAlN coating was tested for machining of Ti6Al4V alloy with a Widmanstatten structure. In order to improve the tool life, cutting tools were subjected to deep cryogenic treatment. In total, three groups of tools were prepared for this study. The first group was used for reference as the supplied state; the second group was subjected to 24 hours deep cryogenic treatment at -196 ° C, and the third group was subjected to 24 hours deep cryogenic at -196 ° C, additionally was tempered 2 hours at 200 ° C. Machining experiments were done by drilling and a set of 60 holes were drilled with each drill bit, and tool wear were observed and recorded with a stereo microscope. Additionally, Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS) analyses were carried on to understand the tool wear better. The microhardness of Cryo-treated and tempered cutting tools hardness increased up to 20 Hv (about 1%), and the toughness value did not change significantly. Cutting performance was observed by measuring the cutting forces during drilling experiments. According to these results, deep cryogenic treatment on WC-Co-based inserts decreased cutting forces by approximately 7% compared to the reference drill bit, which affected the cutting tool life. The dominant wear mechanism was Built-up edge (BUE) formation, and cryo-treatment lowered the BUE amount 8% and cryo-treated and tempered drill bit 45% compared to the reference drill bit.

Loading of bearing retaining pin of tricone drill bit

2020 ◽  
pp. 64-67
Author(s):  
D. I. Simisinov ◽  
◽  
A. I. Afanasiev ◽  
V. S. Shestakov ◽  
N. G. Valiev ◽  
...  
Keyword(s):  
Strain Analysis ◽  
Physical And Mechanical Properties ◽  
Contact Stresses ◽  
Drill Bit ◽  
Ministry Of Education ◽  
Drill Bits ◽  
Bending Loads ◽  
Bearing Assembly ◽  
Engineering Changes ◽  
Cone Drill

Improvement of cone drill bit design is an engineering challenge as it is connected with considerable energy to be transferred via the drill to well bottom in the limited well space. In such conditions, it is difficult to create a full-size bearing assembly, including bearings and lubricating devices, as well as the sufficiently efficient cutting structure of the bits. Moreover, the condition of equal lives of the cutting structure and the bearing assembly is to be fulfilled. The operating practice of tricone drill bits in shothole drilling reveals their low serviceability. The life of a bit ranges from a few hours to a few days subject to physical and mechanical properties of rocks. The main cause of bit failure is damage of the retaining pin shoulder rivet under high contact stresses. Aimed at improvement of cone drill bit design and justification of engineering changes, the stress–strain analysis of the bearing retaining pint is performed, and it is found that the pin shoulder rivet experiences essential contact stresses and bending loads. It is proposed to equip cone drill bits with circulation lubrication system for the bearing assembly. Lubrication improvement can ensure reduction in loading of the bearing assembly components and, consequently, provide higher durability and wear resistance of these parts. The study was supported by the Ministry of Education and Science of Russia according to the state contract with the Ural State Mining University, Contract No. 0833-2020-0007.

scholarly journals Modeling of “combined cutter - cone” connection in tricone drill bits

2019 ◽  
Vol 5 (3-4) ◽  
pp. 70-76
Author(s):  
Andrii Slipchuk ◽  
◽  
Andrii Kuk ◽  
Yaroslav Kusyi ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Stability ◽  
Cutting Tool ◽  
Rock Cutting ◽  
The Body ◽  
Fretting Wear ◽  
Solid Alloy ◽  
Energy Interaction ◽  
Drill Bits ◽  
Carbide Inserts

A theoretical analysis of the stiffness of the “cutter-cone” connection was performed. In the article the character and magnitude of the tension at the contact of "cutter-cone" are investigated. An analysis of the surface of the openings for carbide inserts revealed traces of plastic deformation and fretting wear. Since the contact bond of the cutter with the body of cone is the only factor that provides the strength of the connection, let consider the effect of mechanical properties of the cones body and a cutter on the magnitude of the forces of contact and tension in the connection. The surface of the shaft of this design consists of equal parts of solid alloy and steel. If you make a ring at a smaller diameter of the shank of a carbide cutter, this will increase the reliability of the connection of the insertion with the body of the rock cutting tool, optimize toughness of cutter fastening, and ensure high stability of the hard-alloyed inset cutter before fracture. As a result of the conducted researches, a qualitative correlation between the hardness of the carbide insertion fastening in the holes of cone and the nature of the destruction of the carbide cutters has been established. Due to the conducted research, the character of the distribution of contact tensions in the conjugated areas “combined cutter - a hole of cone” was established. The theme of the development of new rational constructions of rock-destructive equipment of cones, rock-destructive inserts, schemes of its effective arrangement on the brushes of cone is still actual. A separate issue of further research is the study of functional and energy interaction of elements of propulsion and rock-destructive equipment.

scholarly journals IMPROVING METHODS OF ENERGY- EFFICIENT OPERATION OF DRILLING EQUIPMENT USING VORTEX TUBES WHEN DRILLING WELLS WITH AIR PURGING

2020 ◽  
Vol 2020 (3) ◽  
pp. 45-54
Author(s):  
R Djuraev ◽  
◽  
J Toshov ◽  
D Khatamova
Keyword(s):  
Temperature Regime ◽  
Cutting Tool ◽  
Combustion Engine ◽  
Cutting Tools ◽  
Experimental Tests ◽  
Rock Cutting ◽  
Drive Power ◽  
Efficient Operation ◽  
Air Blowing ◽  
Forced Cooling

The practice of drilling has proven that the use of compressed air as a cleaning agent provides a significant increase in ROP (mechanical drilling speed) and reduces the time spent on eliminating geological complications, which sharply increases the productivity and economy of drilling operations. However, air has a low heat capacity compared to liquid flushing solutions, this affects the operation of rock cutting tools through high contact temperatures with irreversible consequences such as deformation of matrices, destruction of diamonds, grinding, reduction of diamond hardness and tool burns. To prevent these problems, there is a need to develop technical means and technology to effectively ensure the temperature regime of the rock-cutting tool. In addition to normalizing the temperature regime of the rock-cutting tool, there is the problem of increased energy consumption of drilling due to the use of compressor units, the drive power of which is much higher than that of pumps used in similar conditions. This article discusses the possibility of normalizing and regulating the temperature regime of the rock-cutting tool due to forced cooling of the cleaning air at the bottom hole to negative temperatures. It also describes the possibility of increasing the efficiency of drilling wells with air blowing by using a heat recovery unit for compressor drive heat and excess air, and presents the results of experimental tests to determine the effect of the ejection of exhaust gases from an internal combustion engine on the efficiency of its operation

scholarly journals Lifetime and Performance Improvement of HSS Drill Bit by Titania (TiO2) Nano-Coatings and Cryogenic Treatment

2019 ◽  
Vol 8 (6) ◽  
pp. 1389-1393
Keyword(s):  
High Speed ◽  
Cryogenic Treatment ◽  
Cutting Tools ◽  
Pure Titanium ◽  
High Speed Steel ◽  
Target Material ◽  
Drill Bit ◽  
Sem Images ◽  
X Ray ◽  
Drill Bits

The small and medium scale industry in drilling and cutting sector widely use cutting tools made by High Speed Steel (HSS). The improvement of lifetime of HSS drill bits helps these establishments to achieve product economy. The improvement in the performance and service lifetime of high-speed steel (HSS) twisted drill bits are studied by depositing Titanium dioxide (TiO2 ) nano-coatings using reactive dc magnetron sputtering Method. Pure titanium (99.99%) metal is used as target material for making nano-coatings in oxygen atmosphere. X-ray diffraction studies indicated change of phase of annealed samples compared to as-deposited coatings. X-ray reflection (XRR) measurements estimated nanocoating thickness on the HSS drill bit around 100nm. The lifetime of TiO2 nano-coated, and cryogenically treated nano-coated tools significantly improved compared to uncoated (bare) HSS drill bit. The tool life has been enhanced by about 16% when TiO2 nano-coatings were made on HSS drill bits. Further lifetime enhancement of 10% was observed when the nanocoated drill bit is given cryogenic treatment in liquid nitrogen. SEM images and EDS profiles are reported. The minimum surface roughness measured as 7.296x10-6m for TiO2 coated and cryo-treated HSS drill tool.

scholarly journals The Calculation of the Tensely Strained State of the System «Diamond Bit-Bottom»

2015 ◽  
Vol 9 (11) ◽  
pp. 203
Author(s):  
Aigerim E. Assan ◽  
Yury E. Budyukov ◽  
Vladislav P. Onishin ◽  
Vitaly V.Povetkin ◽  
Toktasin M. Mendebayev
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cutting Tool ◽  
Rock Cutting ◽  
External Loading ◽  
Drill Bit ◽  
Strained State ◽  
Geological Conditions ◽  
Diamond Bit ◽  
Element Method

<p class="zhengwen">The design procedure of the tensely strained state(TSS) of the system <strong>«</strong>diamond bit-bottom<strong> » </strong>is developed, basic analytical dependences, characterizing TSS of the system of the calculation the basic parameters-tension, strains under the influence of an external loading on the diamond bit with finite-element method application (FEM) are chosen in the offered article. The questions of the creation in plane posing with usage of share the block - schema of the program, realizing finite-element method. For components of the process of interaction with a diamond bit rock used the method of mathematical modeling of components of the process (partial solutions) output data which will be the main characteristics of the process, allow to formulate requirements for the development of the diamond rock cutting tool.</p> <p class="zhengwen">And also addressed the issues of creating a removable drill bit used for boring exploration wells are considered in the article. The authors propose a technological solution for the modernization and improvement of removable drill bit, taking into account the various stages of deterioration of diamond bits.</p> The possibility of improving the diamond destructive tool, including a special on the scientific, engineering and technological level are far from exhausted. Diamond drilling in difficult geological conditions accompanied not enough efficient use of energy supplied to the face, the working face of overheating matrices crowns, abnormal wear of the rock cutting tool, and is not always suitable geological work quality. In this context, the relevance of the set objectives in this paper is quite obvious.

Improving the Efficiency of Rock Destruction Tools when Drilling Wells in difficult Mining and Geological Conditions

2021 ◽  
Vol 9 (3) ◽  
pp. 198-202
Keyword(s):  
Temperature Regime ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Rock Cutting ◽  
Rock Destruction ◽  
Bottom Hole ◽  
Geological Conditions ◽  
Difficult Terrain ◽  
Forced Cooling

Air blast drilling is effective in the most unfavorable conditions for liquid flushing: when drilling in areas with significant circulation losses, when there are difficulties with water supply, in high mountainous or difficult terrain, or in areas with harsh climates. However, air has a low heat capacity compared to liquid flushing solutions, this affects the operation of rock cutting tools through high contact temperatures with irreversible consequences such as deformation of matrices, destruction of diamonds, grinding, reduction of diamond hardness and tool burns. To prevent these problems, there is a need to develop technical means and technology to effectively ensure the temperature regime of the rock-cutting tool. This article discusses the possibility of normalizing and regulating the temperature regime of the rock-cutting tool due to forced cooling of the cleaning air at the bottom hole to negative temperatures, and a new design of the drilling projectile for drilling with air purging is developed. The results of experimental studies of the developed design of the drilling projectile are also presented.

scholarly journals Development of Optimal Design and Circular Broach Modular Design of Disc Cutters with the Development of a Parametric Model

2021 ◽  
pp. 15-21
Author(s):  
Ezekiel Oluwadamilare Akintona ◽  
Okeagu Fredrick ◽  
Nwufo Maduka Augustine
Keyword(s):  
Machine Tools ◽  
High Performance ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Modular Design ◽  
Cutting Tools ◽  
Work Piece ◽  
Geometrical Parameters ◽  
Disc Cutters ◽  
High Level

Cutting tool is one of the most important instruments in production. It is used for machining of different components on machine tools. A material is cut into a chip to incur the desired work piece surface currently used in engineering various cutting tools. The directions of development of structures of metal cutting tools are: higher precision of dimensional and geometrical parameters, the use of new tool materials, cost, and quick. The cutting tools are not only affected by the design of machine, technology of manufacturing of products, but also impact the constructive forms of machine parts. The emergence of mechanical spine, thanks to the pull method. Spine broach can provide high-performance processing spine bore with the required accuracy. The development of heavy machine tools required the creation of new designs of large instruments. The use of mechanical automatic lines also required design tools with high dimensional stability capable of handling the items within the specified tolerance for a certain time. Instruments were developed in the process of renewing the cutting edge of the cutting tools with automatic adjustment; setting up tools on the size of the machine is a device for automatic replacement of worn tool in the process line of the Computer-Aided Manufacturing CAM of the cutting tool special requirements. Equipment must operate with high level efficiency, so to reduce the loss of time resetting of the need to minimal. A cutting tool requires knowledge of the theoretical foundations of design and calculation tools using CAD.

scholarly journals RESEARCH OF THE STRESS-STRAIN STATE OF THE ROCK IN CONTACT WITH THE ELEMENTS OF THE DRILL BIT DURING DRILLING

2020 ◽  
Vol 2020 (3) ◽  
pp. 112-121
Author(s):  
L Toshniyozov ◽  
◽  
J Toshov ◽  
Liu Songyong
Keyword(s):  
Strain State ◽  
Cutting Tools ◽  
Longitudinal Direction ◽  
Rock Cutting ◽  
Drill Bit ◽  
Structural Elements ◽  
Stress Strain ◽  
Rock Destruction ◽  
Stress Strain State ◽  
Short Time

Research of the interaction of rock-cutting tools with rock with various approaches is presented in the article. In contrast to analytical and experimental methods with their limited and costly applicability, it is proposed to use numerical modeling to better represent the mechanics of rock destruction, to visualize the stages of destruction in a short time and in a cheaper way. This article allows to get an idea that using the finite element method can get mathematical modeling of plastic deformation, assess the stress-strain state of the bit and optimize the structural elements and working conditions of the rock cutting tool, analyze the dynamics of fracture forces and others. The dynamic interaction of the drill bit with the rock in case of two cones with different arrangement of buttons on one crown is investigated. In the process of analysis, it was found that the interaction of paired buttons with rocks has a force action on the area of the rock as well as the cone of the industry bit, but in a more intensively fluctuating way, by also saving energy. Advantageously, the arrangement of the buttons in pairs has not only tensile stress in the longitudinal direction, but also in the transverse direction, contributing to a wide coverage of the fracture zone

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