scholarly journals Study of PDC drill bit crown shape for design optimization: angle of blade inclination aspect

2019 ◽  
pp. 32-41
Author(s):  
Т. О. Pryhorovska ◽  
O. V. Pryhorovskyi
Keyword(s):  
Design Optimization ◽  
Structural Heterogeneity ◽  
Horizontal Axis ◽  
Drill Bit ◽  
Contact Areas ◽  
Crown Shape ◽  
Pdc Bit ◽  
Spatial Shape ◽  
Balance Of Forces ◽  
Twisting Angle

The article studies PDC-type bit operation, in particular, the redistribution of loads on drill bit blades is simulated, depending on “cutter-rock” contact areas, which is determined by a drill bit design. This work aims at PDC bit design optimization, namely to study the effect of the blade angle to the horizontal axis on the torque generated by the bit. The study is based on the Voitanovich and Kuru’s model of Voitanovich and Kuru’s and has its core at determining the balance of forces acting on a single cutter. The scientific novelty of the work is that two areas of contact are considered for each cutter – the on the front and side surfaces. Also, it is hypothesized that the force of the reaction of the pore is directed towards the placement of heterogeneities of the rock. This approach makes it possible to consider the fluctuations of the bits due to the instability of the cutting forces, which in turn are caused by the instability of the properties of the fractured rocks (first of all, their structural heterogeneity).The spatial shape of the PDC cutter crown was studied, characterized primarily by the shape of its upper part, which in turn is characterized by the angle of inclination of the cutting part of the cutter. Contact areas for each cutter, the volume of the destroyed rock depending on the location of the cutter, as well as the loading for a single cutter, the torque for the whole blade and the bit were simulated in the work. The angles of inclination of the blade to the horizontal axis at which the minimum / maximum torques are observed are determined.Changing the inclination of the cutting part causes the redistribution of the destroyed rock volumes. This section dealt with worn-out chisels, and the load was distributed in proportion to the volume of the destroyed rock. It was found that increasing the angle of the blade causes an increase in the total torque for the bit. A method is proposed that allows optimization of the PDC bit design. An increase in the total twisting angle and the total deflection is observed for the cutters, which are most separated from the borehole face.

A wear model for subrough surface contacts of martensitic steels

2019 ◽  
Vol 233 (10) ◽  
pp. 1574-1584 ◽  
Author(s):  
Anatoliy G Suslov ◽  
Mikhail G Shalygin
Keyword(s):  
Mathematical Model ◽  
Structural Heterogeneity ◽  
Martensitic Steels ◽  
Adhesion Forces ◽  
Friction Couple ◽  
Wear Model ◽  
Theoretical Concepts ◽  
Contact Areas ◽  
Wear Modelling ◽  
Deformation Component

This article includes an analysis of techniques for determining wear of contact areas to show two lines of wear research – due to deformations and adhesion forces. It has been established that surface subroughness is not presently taken into account in calculations of wear despite the fact that this surface property is of increasing research interest. The paper aims to develop a mathematical model of wear for subrough surface contacts in the context of deformation and theories of adhesion. Mathematical wear modelling for subrough surfaces is based on studies on causes of their formation due to phase and structural heterogeneity of the material. The article considers contact interaction at the level of surface subroughness; physics of interaction of contact areas at the level of surface subroughness; a mathematical model of deformation and adhesive wear for subrough surface contacts of martensitic steels; some analytical dependences of the theoretical model for a body-centred tetragonal lattice. Analysis of the theoretical concepts shows that wear of subrough surface contacts depends largely on the deformation component, while the adhesive component is significant only during the ‘bedding-in’ period for a friction couple. The materials of the article can be used to calculate the wear for contact areas at the level of surface subroughness.

Mathematical Modeling of PDC Bit Drilling Process Based on a Single-Cutter Mechanics

1993 ◽  
Vol 115 (4) ◽  
pp. 247-256 ◽  
Author(s):  
A. K. Wojtanowicz ◽  
E. Kuru
Keyword(s):  
Polycrystalline Diamond ◽  
Rock Properties ◽  
Drilling Process ◽  
Drilling Parameters ◽  
Pdc Bit ◽  
Analytical Development ◽  
Assumed Similarity ◽  
Balance Of Forces ◽  
Bit Life ◽  
Polycrystalline Diamond Compact

An analytical development of a new mechanistic drilling model for polycrystalline diamond compact (PDC) bits is presented. The derivation accounts for static balance of forces acting on a single PDC cutter and is based on assumed similarity between bit and cutter. The model is fully explicit with physical meanings given to all constants and functions. Three equations constitute the mathematical model: torque, drilling rate, and bit life. The equations comprise cutter’s geometry, rock properties drilling parameters, and four empirical constants. The constants are used to match the model to a PDC drilling process. Also presented are qualitative and predictive verifications of the model. Qualitative verification shows that the model’s response to drilling process variables is similar to the behavior of full-size PDC bits. However, accuracy of the model’s predictions of PDC bit performance is limited primarily by imprecision of bit-dull evaluation. The verification study is based upon the reported laboratory drilling and field drilling tests as well as field data collected by the authors.

Investigation of PDC bit failure base on stick-slip vibration analysis of drilling string system plus drill bit

2018 ◽  
Vol 417 ◽  
pp. 97-109 ◽  
Author(s):  
Zhiqiang Huang ◽  
Dou Xie ◽  
Bing Xie ◽  
Wenlin Zhang ◽  
Fuxiao Zhang ◽  
...  
Keyword(s):  
Vibration Analysis ◽  
Drill Bit ◽  
Stick Slip ◽  
Drilling String ◽  
Pdc Bit

Real-Time Lookahead Imaging Using the Drill Bit as Seismic Source

2021 ◽  
Author(s):  
Alexander Valentin Goertz ◽  
Tatiana Thiem ◽  
Endre Vange Bergfjord ◽  
Audun Libak ◽  
Brian Atkinson ◽  
...  
Keyword(s):  
Real Time ◽  
Seismic Source ◽  
Seismic Signal ◽  
Drill Bit ◽  
The North ◽  
Look Ahead ◽  
Imaging Results ◽  
Pdc Bit ◽  
Well Trajectory ◽  
Bottom Hole Assembly

Abstract We monitor the seismic signal emitted from a rotating drill bit in real time with an array of seismic sensors at the seafloor. Drill-bit seismic signals provide information to locate the drill-bit position itself and to image geological objects ahead and around the drill bit for geosteering purposes during drilling operations. The data can be obtained in real time without the need to stop drilling for logging and without any additional downhole instrumentation in the bottom hole assembly. Drill-bit positioning accuracy is independent of measured depth and with meter level lateral precision. This is significantly better than conventional downhole gyro-based methods, especially for long horizontal wells. With sources along the drilled well path approaching a target reservoir we obtain a 3D reverse VSP (RVSP) image around the well for prediction ahead of the drill bit. This paper presents a case study from the Grane reservoir in the North Sea, where we utilize a permanent reservoir monitoring (PRM) array for listening to signals emitted from drilling with a PDC bit. We present imaging results from a highly deviated well and compare them to 3D seismic. The field example shows the ability to look ahead several hundreds of meters below the drilled well trajectory.

Suspension Design Optimization of a Washing Machine: Part I — Modeling and Validation Results

1993 ◽  
Author(s):  
O. S. Türkay ◽  
A. K. Tuğcu ◽  
I. T. Sümer ◽  
B. Kiray
Keyword(s):  
Design Optimization ◽  
Experimental Validation ◽  
Linear Time ◽  
Optimization Method ◽  
Companion Paper ◽  
Simulation Software ◽  
Horizontal Axis ◽  
Washing Machine ◽  
Rigid Body Dynamic ◽  
Linear Time Invariant

Abstract The development of a non-linear time invariant rigid body dynamic model and the experimental validation of the suspension system of a horizontal-axis washing machine has been discussed in previous works by the authors. In this paper (Part I), modeling and experimental validation of a different suspension configuration of a test washing machine is assessed. The simulation model predicts the transient and steady-state vertical and horizontal amplitudes within maximum errors of 10% and 14%, respectively. The results are consistent with the results of the previous work. Thus, the simulation software code is verified for a generalized suspension design optimization of horizontal-axis washing machines. In a companion paper (Part II), various formulations are discussed to select an objective function for parametric suspension design optimization and a parametric grid optimization method is implemented to the test washing machine introduced in this paper.

Design Optimization of Hub for 3-Bladed Horizontal Axis Tidal Turbine

2014 ◽  
Vol 620 ◽  
pp. 111-114
Author(s):  
Muhammad Kamran ◽  
Zhen Yu Li ◽  
Shi Fan Zhu ◽  
Fan Kai Kong
Keyword(s):  
Stress Concentration ◽  
Design Optimization ◽  
Wind Turbines ◽  
Maximum Stress ◽  
Minimum Weight ◽  
Horizontal Axis ◽  
Ansys Software ◽  
Novel Approach ◽  
Tidal Turbine

In this paper, Wind turbines knowledge, which is already matured enough, is effectively used for design of horizontal axis tidal turbine (HATT) hub. Design optimization keeping in view the shape and strength for minimum weight was done using ANSYS software. Maximum stress concentration areas are found to be the blade roots and edges of shaft connection. A novel approach is used to optimize the fillet radii along with overall thickness.

The Role of 3D Rock Chips and Cutting Area Shapes in PDC Bit-Design Optimization

2014 ◽  
Author(s):  
Shilin Chen ◽  
Greg Grosz ◽  
Seth Anderle ◽  
Rob Arfele ◽  
Keshan Xun
Keyword(s):  
Design Optimization ◽  
Pdc Bit

scholarly journals Numerical simulation study on the optimization design of the crown shape of PDC drill bit

2013 ◽  
Vol 4 (4) ◽  
pp. 343-350 ◽  
Author(s):  
Pei Ju ◽  
Zhenquan Wang ◽  
Yinghu Zhai ◽  
Dongyu Su ◽  
Yunchi Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
Optimization Design ◽  
Drill Bit ◽  
Crown Shape

Design and Study of PDC Bit for Igneous Rock Formation of Santanghu

2010 ◽  
Vol 156-157 ◽  
pp. 379-382
Author(s):  
Zhong Liang Wei ◽  
Jian Qun Zhang ◽  
Ji Tai Li ◽  
Ji Biao Xue ◽  
Yong Zhang
Keyword(s):  
Igneous Rock ◽  
Polycrystalline Diamond ◽  
High Hardness ◽  
Rake Angle ◽  
Design Methods ◽  
Optimized Design ◽  
Rock Stratum ◽  
Rock Formation ◽  
Crown Shape ◽  
Pdc Bit

Based on the geological configuration and formation lithology of igneous rock stratum of Santanghu, optimized design methods of PDC (polycrystalline diamond compact) bit are used to design PDC bit crown shape, cutting angle, the distribution of cutters and hydraulic structure, etc. Especially, these methods, which are design methods of gentle crown profile, spiral blade, high-density distribution of cutters, suitable back rake angle, and hydraulic structures which are more flexible nozzles of asymmetric arrangement and deeper fluid course layout, are fit for high hardness, multiple interbed and high abrasiveness of the igneous rock formation. The bit designed in this paper has turned out to be much better in the experiment of Horse 36 well of Santanghu.

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