Wear of Spiral Seal Cone Bit in Complex Formations

SPE Journal ◽  
2021 ◽  
pp. 1-16
Author(s):  
Y. Zhou ◽  
J. H. Hu ◽  
B. Tan ◽  
Y. Jiang ◽  
Y. F. Tang
Keyword(s):  
Friction Coefficient ◽  
Working Conditions ◽  
Wear Mechanism ◽  
Testing Machine ◽  
Wear Test ◽  
Simulation Method ◽  
Wear Testing ◽  
Wear Loss ◽  
Wear Depth ◽  
Wear Properties

Summary Sealing is a technical bottleneck that affects drilling efficiency and cost in deep, difficult-to-drill formations. The spiral combination seal with active sand removal performance is a new type of seal, and the wear mechanism is not clear, resulting in no effective design. In this study, the wear properties of materials were measured by a friction-and-wear testing machine, and the measurement methods and criteria of wear loss and friction coefficient were established. The fitting function of working condition and friction coefficient was studied by fitting regression method. The law of influence of working conditions on friction coefficient and wear amount was determined. The actual wear model and evaluation criteria of wear condition were established by using wear test data and geometric relationship. The relationship among working conditions, contact stress, and wear depth is determined by numerical simulation method, and the wear mechanism of the new seal is revealed, which provides a theoretical basis for its application.

Research on the Friction and Wear Properties of the NBR under Dry Sliding and Water Lubrication

2013 ◽  
Vol 420 ◽  
pp. 234-239
Author(s):  
Feng Yan Yang ◽  
Shi Jie Wang ◽  
Xiao Ren Lv
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Coefficient Of Friction ◽  
Testing Machine ◽  
Water Lubrication ◽  
Wear Testing ◽  
Wear Loss ◽  
Dry Sliding ◽  
Wear Properties ◽  
Lubrication Performance

The wear mechanisms of different graphite contents of NBR by 45# steel under dry sliding and water lubrication were investigated. On MPV-600 computer-controlled abrasive wear testing machine, the coefficients of friction were measured continuously. Results showed that under dry sliding condition, the rubber wear loss is big, the coefficient of friction is higher, the temperature of the friction surface is rise obviously. Wear loss and friction coefficient of NBR decrease with the increase of graphite contents; With the increase of graphite contents wear loss and the friction coefficient decreases, and is mainly due to the graphite lubrication performance and increase the stiffness of the rubber contact area. At low content of graphite, adhesive wear of NBR is showed, in the high content of graphite, abrasive wear is showed. Water lubrication condition, wear surface level off, the wear loss is very small, and the lubrication and cooling effect of water makes the friction coefficient decrease. Graphite content is higher, the wear loss and coefficient of friction is smaller.

Wear Properties of DLC and Plasma Sprayed WC Structure Coating

2007 ◽  
Vol 127 ◽  
pp. 245-250 ◽  
Author(s):  
Mitsuyasu Yatsuzuka ◽  
Yoshihiro Oka ◽  
Akifumi Tomita ◽  
Noritaka Murata ◽  
Mitsuaki Hirota
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Testing Machine ◽  
Carbon Film ◽  
Wear Testing ◽  
Wear Properties ◽  
Dlc Film ◽  
Coated Metal ◽  
Hydrocarbon Gas ◽  
Plasma Sprayed

Diamond-like carbon film (DLC) with an interlayer of plasma sprayed tungsten-carbide (WC) was prepared on an aluminum alloy substrate (A5052) by a hybrid process of plasma-based ion implantation and deposition using hydrocarbon gas. Typical thicknesses of DLC and WC films were 1 μm and 100 μm, respectively. The hardness and friction coefficient of DLC were typically 15 GPa and 0.15, respectively. The durability of DLC/WC/A5052 system was evaluated from the measurement of the friction coefficient by a ball-on-disk friction tester in which the loaded ball was drawn repeatedly across a sample and the load was increased with each traverse. For the DLC/A5052 system, which has no WC interlayer, the DLC film was broken quickly because of distortion of the substrate. For the DLC/WC/A5052 system, on the other hand, the DLC film was excellent in durability for long running. The wear rate of rubber rotor to the metal rotor was measured by a roller-pitching-type wear testing machine, showing large reduction in wear rate using DLC-coated metal rotor.

The Effect of Particle Concentration and Magnetic Field on Tribological Behavior of Magneto-Rheological Fluid

2011 ◽  
Vol 314-316 ◽  
pp. 58-61 ◽  
Author(s):  
Wan Li Song ◽  
Chul Hee Lee ◽  
Seung Bok Choi ◽  
Myeong Woo Cho
Keyword(s):  
Magnetic Field ◽  
Friction Coefficient ◽  
Wear Mechanism ◽  
Particle Concentration ◽  
Tribological Behavior ◽  
Wear Loss ◽  
Wear Properties ◽  
Mr Fluid ◽  
Magneto Rheological ◽  
The Magnetic Field

In this paper, the effect of particle concentration and magnetic field on the tribological behavior of magneto-rheological (MR) fluid is investigated using a pin-on-disc tribometer. The wear loss and friction coefficient are measured to study the friction and wear properties of MR fluid. The morphology of the worn pin is also observed by scanning electron microscope (SEM) in order to analyze the wear mechanism. The results obtained in this work show that the wear loss and friction coefficient decrease with increasing particle concentration under the magnetic field. Furthermore, it is demonstrated that the magnetic field has a significant effect on improving tribological properties of MR fluid, especially the one with high particle concentration. The predominant wear mechanism of the MR fluid has been identified as abrasive wear.

Effect of Subsurface Deformation on Sliding Wear Behavior of Ti-29Nb-13Ta-4.6Zr Alloys for Biomedical Applications

2014 ◽  
Vol 616 ◽  
pp. 270-274
Author(s):  
Yoon Seok Lee ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Kengo Narita ◽  
Junko Hieda ◽  
...  
Keyword(s):  
Wear Mechanisms ◽  
Wear Behavior ◽  
Testing Machine ◽  
Wear Test ◽  
Wear Testing ◽  
Wear Properties ◽  
Delamination Wear ◽  
Frictional Wear ◽  
Fixation Devices ◽  
Spinal Fixation Devices

The wear mechanisms of conventional Ti–6Al–4V extra-low interstitial (Ti64) and the new Ti–29Nb–13Ta–4.6Zr (TNTZ) were studied to investigate the wear properties of Ti64/TNTZ for application in spinal fixation devices. Ti64 and TNTZ balls and discs were first prepared as wear-test specimens. A ball-on-disc frictional wear-testing machine was used in air to perform the frictional wear tests of the Ti64 and TNTZ discs mated against Ti64 and TNTZ balls. The wear mechanisms were investigated using a scanning electron microscopy to analyze the worn surfaces and wear debris. The volume losses for the TNTZ discs were larger than those for the Ti64 ones, regardless of the mating ball material. Furthermore, the morphologies of the wear tracks and the debris of the Ti64 and TNTZ discs were different, suggesting that the wear mechanisms for the Ti64 and TNTZ discs were abrasive and delamination wear caused by mild and severe subsurface deformations of the Ti64 and TNTZ, respectively, regardless of the mating ball material.

Study on friction characteristics of sliding interface of feed system

2020 ◽  
Vol 72 (7) ◽  
pp. 865-871
Author(s):  
Pan-Pan Li ◽  
Feng Gao ◽  
Yan Li ◽  
Bo Yang
Keyword(s):  
Friction Coefficient ◽  
Peer Review ◽  
Working Conditions ◽  
Contact Surface ◽  
Testing Machine ◽  
Mixed Lubrication ◽  
Wear Testing ◽  
Feed System ◽  
Content Type ◽  
Start Up

Purpose The serious friction caused by the fluctuation of friction occurs when start-up and will reduce the positioning accuracy of the servo axes of high precision machine tools, the purpose of this paper is to study the friction fluctuation characteristics of friction coefficients between interfaces under different working conditions. Design/methodology/approach HT200 and 45# materials were experimentally studied by friction and wear testing machine UMT-3, the variation of friction coefficient under different working conditions (different start-up conditions, the variation of lubrication state area and different roughness) were measured. Findings The results show that the larger start-up acceleration shortens the pre-sliding time of the interface friction, makes the friction coefficient decrease faster, reduces the mixed lubrication area of the contact surface and makes the contact surface reach the stable lubrication state quickly. It can be concluded that the larger roughness surface will lead to the larger mixed lubrication area, the larger static friction coefficient and the larger drop between static and dynamic friction coefficient and easy to cause friction vibration. Originality/value The results reveal the friction fluctuation rule of the metal interface during the different start-up process, which is of guiding significance to reveal the lubrication principle and mechanism of the mechanical interface. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2019-0482/

scholarly journals WEAR CHARACTERIZATION OF LM29 ALLOY WITH40 MICRON SIZED B4C REINFORCED METAL COMPOSITES

2021 ◽  
Vol 9 (11) ◽  
pp. 363-371
Author(s):  
G. Pathalinga Prasad ◽  
◽  
H.C. Chittappa ◽  
Madeva Nagaral ◽  
◽  
...  
Keyword(s):  
Normal Load ◽  
Testing Machine ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Wear Testing ◽  
Wear Loss ◽  
Wear Properties ◽  
Alloy Matrix ◽  
Pin On Disc ◽  
B4c Particles

This paper deals with the fabrication and evaluation of wear properties by introducing40 micron size B4C particulates into LM29 alloy matrix. LM29 alloy based metal matrix composites were prepared by stir casting method. 3, 6 and 9 wt. % of 40 micron sized B4C particulates were added to the base matrix. For each composite, the reinforcement particles were pre-heated to a temperature of 600 degree Celsius and then dispersed in steps of two into the vortex of molten LM29 alloy to improve wettability. The Micostructural study was done by using Scanning Electron Microscope (SEM), which revealed the uniform distribution of B4C particles in matrix alloy, EDS analysis confirmed the presence of B4C particles in the LM29 alloy matrix.A pin-on-disc wear testing machine was used to evaluate the wear loss of prepared specimens, in which a hardened EN32 steel disc was used as the counter face. The results revealed that the wear loss was increased with increase in normal load and sliding speed for all the specimens. The results also indicated that the wear loss of the LM29-B4C composites were lesser than that of the LM29 matrix. The worn surfaces and wear debris were characterized by SEM microanalysis.

Effect of Acrylamide Modified Liner on Properties of Self-Lubricating Spherical Plain Bearings

2014 ◽  
Vol 668-669 ◽  
pp. 306-309
Author(s):  
Ming Qiu ◽  
Ren Song Hu ◽  
Ying Chun Li ◽  
Zhuo Pei Yang ◽  
Chuang Chuang Duan
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Loss ◽  
Wear Properties ◽  
Bonding Properties ◽  
Friction Temperature ◽  
Spherical Plain Bearing ◽  
Correlational Dependence

The effects of acrylamide modified liner on bonding properties and tribological properties of self-lubricating spherical plain bearings were explored by used of Instron5944 electronic universal testing machine and homemade spherical plain bearings friction and wear tester. The results showed that the bonding properties of bearings modified by acrylamide modified liner were much more improved than those of the unmodified bearings; Self-lubricating spherical plain bearing friction and wear properties and oscillating frequency obvious correlational dependence. With the increase of the oscillation frequency, the friction coefficient and the wear loss increased, while the friction temperature rose. The friction coefficient, wear loss and friction temperature of bearings modified were much more improved than those of the unmodified bearings. It showed that the liners after modification treatment can improve the tribological properties of self-lubricating spherical plain bearings.

A Comparative Study on the Wear Behavior of Cast and Forge Aged A356 Alloy with Addition of Grain Refiner and/or Modifier

2014 ◽  
Vol 592-594 ◽  
pp. 1255-1261 ◽  
Author(s):  
D.G. Mallapur ◽  
D.G. Sondur ◽  
K.R. Udupa
Keyword(s):  
Comparative Study ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Testing Machine ◽  
A356 Alloy ◽  
Wear Testing ◽  
Unexpected Result ◽  
Wear Properties ◽  
Grain Refiner ◽  
Aged Material

In the present work, a comparative study on the wear behavior of cast aged and forge aged A356 alloy has been investigated without and with the addition of grain refiner and modifier, under dry sliding conditions using a pin-on-disc wear testing machine. The comparison study reveals that tribological properties of A356 materials are highly influenced by T6 heat treatment process. It is found in the present study that, cast aged A356 materials possess higher wear resistance as compared to forge aged materials. Apart from this, the study also reveals that cast aged material is associated with lower frictional forces and coefficient of friction as compared to the forge aged category. It is further observed in the present investigation that abrasive wear mechanism is operative in both the categories of the materials when tested with lower load for lower sliding speed and lower distance of run. At higher values of external parameters the adhesive wear mechanism dominates the wear process. Lower values of wear properties recorded by the forge aged material are an unexpected result in the present studies. It is conceived to be due to the presence of micro cracks while forging.

The Wear Property of Plasma Sprayed Nano-Structured Al2O3-13%TiO2 Coating

2012 ◽  
Vol 184-185 ◽  
pp. 1352-1355
Author(s):  
Hong Sheng Ding ◽  
Zhi Fang Cheng ◽  
Hui Rong ◽  
Lin Lu
Keyword(s):  
Plasma Spraying ◽  
Testing Machine ◽  
Tio2 Coating ◽  
Wear Testing ◽  
Wear Loss ◽  
Wear Property ◽  
Air Plasma ◽  
Wear Properties ◽  
Electron Microscopic ◽  
The Difference

Nano-structured Al2O3-13%TiO2 coating was deposited by air plasma spraying. Wear properties of the coatings under different load trough SRV friction and wear testing machine were studied, the results showed that wear mass loss of Al2O3-13%TiO2 coating by plasma spraying slide with ZrO2 and Si3N4 increase with load increasing, but the difference is that wear loss of coaing slide with Si3N4 ¬is lower than the coating slide with ZrO2 when load is less than 40N. Opposite phenomenon will occur when load is higher than 40N.The wear surface morphology was analyzed trough scanning electron microscopic, the results showed that coating slided with Si3N4 ball when matching at low loads, with a shallow furrow shape grinding. There were wide and deep furrows while at higher loads. Coating slide with ZrO2 ball has no obvious cracks, no layer spalling.Wear was occurred by micro cutting.

Tribological Behaviors of Dense Gelcasting Nanocomposites

2016 ◽  
Vol 868 ◽  
pp. 56-60
Author(s):  
Sung Hun Cho ◽  
Sang Hoon Jeong ◽  
Bum Sung Kim ◽  
Tohru Sekino ◽  
Soo Wohn Lee ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Fracture Mode ◽  
Wear Mechanism ◽  
Hot Isostatic Pressing ◽  
Wear Test ◽  
Wear Properties ◽  
Isostatic Pressing ◽  
Wear Rates ◽  
Tribological Behaviors ◽  
Wear Tests

Gelcasting/pressure less sintered Al2O3/SiC nanocomposites has a low sinterability. Also, mechanical and wear properties of these nanocomposites was degraded. Wear mechanism of low sinterability gelcasting nanocomposites was dominated by fracture mode of surface during wear tests. In this study, gelcasting processing and followed plressureless (PL) and hot isostatic pressing (HIP) sintering was attempted to fabricate dense Al2O3/SiC nanocomposites. Wear behaviors of high densities gelcasting nanocomposites were investigated under the identical wear test condition. The comparative specimen was used to hot pressed nanocomposites. Wear rates of dense gelcasting nanocomposites were related to closely initial friction coefficient.

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