The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Deng Rong - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Simulation and Experimental Study on Wear of Cone Bit Tooth
    Journal of Failure Analysis and Prevention, 2018
    Co-Authors: Deng Rong, Dai Xinji, Hou Kai
    Abstract:

    The Rabinowicz abrasive wear model was adopted. The coefficient K ɛ of teeth abrasive wear is obtained through experiments. The interaction model between Cone Bit and rock was established by Finite Element Software. The problems of large rock morphing and slowing to compute were solved through Mesh Redrawing Method and parallel computing technology. The mount of tooth wear and the appearance of tooth wear of three tooth shapes were analyzed, which were compared with the experiment situations. The results showed that the finite element model could predict the tooth life and its wear very well. The relationship between ROP, rotational speed and tooth wear and rock was explored, providing the Bit selection and parameter recommendation in drilling with basis.

  • Teeth Trajectory Simulation of One-Cone Bit with MATLAB
    Mechanical Research and Application, 2013
    Co-Authors: Deng Rong
    Abstract:

    The computer simulation is maken for one-Cone Bit by the first use of MATLAB software,Cone model is got through the matrix transformation,and trajectory diagram of the wedge teeth is drawn.Through the rock crushing volume calculation,the comparison is obtained about situation of teeth trajectory covering the bottom of profiled-Cone with spherical Cone.The significance is provided to the design of Cone and teeth.

  • The computer simulation of well-bottom trace of the singular one-Cone Bit
    Modern Machinery, 2006
    Co-Authors: Deng Rong
    Abstract:

    The simulation model of interaction between the singular one-Cone Bit and the well bottom by using the geometric model of the one-Cone Bit and the computer simulation technology.The software for simulation of interaction between the Bit and rock is developed.The simulated hit is obtained with structural parameters given and well-bottom trace of interaction between the Bit and rock is presented.The actual well bottom pattern is obtained by the experiment of rock breaking of the Bit, and it is very close to that simulated by the computer.This proves the simulation model correct,and provides a helpful method for the design of hits.

  • The Well-bottom Fluid Field Analysis of One-Cone Bit
    Modern Machinery, 2004
    Co-Authors: Deng Rong
    Abstract:

    It is testified by many facts that single nozzle and dual nozzles have a good clean effect. We study some kinds that are often used. In order to find out the best kind, we can give some good advice to the water system design of one-Cone Bit.

  • CONTACT STRESS ANALYSIS ON THE BEARING OF SINGLE-Cone BitS
    Journal of Southwest Petroleum Institute, 2003
    Co-Authors: Deng Rong
    Abstract:

    The contact stress of the bearing of single-Cone Bit were studied and analyzed with the software Pro/M and the method FEM. The bearing stress distribution, the relations between axial load and radial load, the relations between the structure parameter of the Bit, WOB and contact stress, as well as the contact area were discussed in detail. The distributing curve of the contact stress on the bearing was obtained, some suggestions to design the bearing of the Bit was presented.

Yunhu Lu - One of the best experts on this subject based on the ideXlab platform.

  • theoretical and experimental study on the penetration rate for roller Cone Bits based on the rock dynamic strength and drilling parameters
    Journal of Natural Gas Science and Engineering, 2016
    Co-Authors: Yong Deng, Mian Chen, Yakun Zhang, Yunhu Lu
    Abstract:

    Abstract Roller Cone Bits have been used extensively in petroleum and natural gas mining, and the accurate prediction of their rate of penetration (ROP) is of crucial importance for improving drilling quality and reducing drilling cost. In this study, a new prediction model of the ROP considering the combined effect of the main drilling parameters and rock dynamic compressive strength is developed for roller Cone Bits. The model is derived based on the mechanism of rock fragmentation under a single tooth impact indentation. The newly introduced ROP model is different from others in that it replaces the rock static strength with rock dynamic compressive strength and can reflect the real process of rock dynamic crushing by a roller Cone Bit. The results of theoretical analysis show that the ROP linearly correlates with the Bit rotary speed; the relationship between the ROP and weight on Bit (WOB) is 3/2 power, and the relationship between the ROP and rock dynamic compressive strength is −3/2 power. Furthermore, lab drilling tests on sandstone and limestone are carried out with a full-scale Bit drilling testing machine, and the influence laws of WOB, rotary speed and rock dynamic strength on the ROP are analyzed. In addition, the theoretical ROP values calculated based on the rock dynamic compressive strength and static compressive strength are compared with the experimental ROP values. The results from the tests indicate that the experimental ROP values are basically consistent with the theoretically derived values, and the comparative results show that the theoretical ROP values calculated according to the rock dynamic compressive strength are closer to the actual values with, an average relative error below 15%, signifying that the newly established ROP model in this paper is valid and can be used to predict the drilling rate with reasonable accuracy and can be used to provide useful guidance for optimizing drilling parameters.

Zhiqiang Huang - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of Cone Bit bearing seal based on failure analysis
    Advances in Mechanical Engineering, 2018
    Co-Authors: Zhiqiang Huang
    Abstract:

    To improve the performance of the Cone Bit bearing seal, experimental study and simulation analysis of seal failure were carried out, and optimization of the seal was conducted. Results show that d...

  • Failure Analysis of Roller Cone Bit Bearing Based on Mechanics and Microstructure
    Journal of Failure Analysis and Prevention, 2018
    Co-Authors: Zhiqiang Huang
    Abstract:

    The service life of the roller Cone Bit mainly depends on the bearing. In order to figure out the cause and mechanism of bearing failure, mechanics and microstructure analysis of failed roller Cone Bit bearings are carried out. The results show that the bearing failure mainly includes wear (including adhesive wear and abrasive wear), plastic deformation, crack, fracture and burn. The main reasons for these failures are: abrasives and temperature rise caused by the cuttings and the lubrication failure; stress concentration, shock and vibration due to uneven load and fit clearance; and initial cracks or deficiencies because of unqualified surface treatment. In addition, investigation indicates that seal failure can bring degeneration on the bearing surface, which reduces the hardness of the bearing surface and thus accelerates the failure of the bearing.

  • Cone Bit bearing seal failure analysis based on the finite element analysis
    Engineering Failure Analysis, 2014
    Co-Authors: Yi Zhou, Zhiqiang Huang, Li Tan, Chengsong Qiu, Fuxiao Zhang, Yuan Yuan, Chunmei Sun, Guo Liang
    Abstract:

    Abstract Failure analysis of Cone Bit bearing seals is important in reducing production cost and preventing in-service component failure. However, a generally accepted criterion for their failure has not yet been established because of complexities in both their material properties and the environment. In this study, a two-dimensional axisymmetric finite element analysis (FEA) numerical model was established. FEA software was developed based on the Mooney–Rivlin constitutive model of the rubber material, and the penalty function contact algorithm. The distributions of stress, strain and contact pressure were analyzed to establish their effect on failure. The locations and causes of the failure and preventive measures were determined by comparison with an actual failure case. It was found that stress concentration and uneven pressure distribution occur at the seal. Rubber rings are highly and unequally compressed. Metal ring structure mainly determines sealing performance. To reduce the occurrence of failure, the structure must be improved by: designing an appropriate angle-tapered metal ring end face structure instead of a plane to change the trend in pressure distribution, increasing the contact area of the metal ring end face to reduce contact pressure and make the contact pressure distribution more uniform to reduce sealing surface wear, reducing the radial thickness to reduce the compression of the rubber ring, and improving back support structures to reduce the stress concentration. Results from the study can prevent and minimize risk for future failures to increase Bit life and reduce drilling costs.

  • experimental research on the surface strengthening technology of roller Cone Bit bearing based on the failure analysis
    Engineering Failure Analysis, 2013
    Co-Authors: Zhiqiang Huang, Shuang Jing, Yi Zhou, Qin Li, Wengang Hu
    Abstract:

    Abstract The roller Cone Bit is one of the most important rock breaking tools used in the oil–gas drilling industry. Its performance directly influences the drilling quality, efficiency and cost. As the world’s oil–gas resource exploration continuously developed, the drilling speed accelerated, accelerating the failure speed of the bearing. The roller Cone Bit’s service life was almost directly dependent on that of the bearing. In this paper, a bearing failure analysis, and an experimental research on the surface strengthening technology of the bearing with field applications etc. were carried out. The results showed that the bearing’s main failure modes included fracture, plastic deformation and wear. The main reasons were overload and uneven distribution of the load; elevated temperature due to friction caused property and structure change in material; wear increased the fit clearance between the bearing and the Cone, increasing dynamic impact load etc. The bearing surface strengthening technology, employing plasma-arc surfacing DH-60 wear resistance alloy, could prolong the service life of the bearing. Experimental research and field tests showed that the wear and impact resistance of the enhanced bearing increased by 30% with an increased service life of 12% on average.

  • Experimental research on the surface strengthening technology of roller Cone Bit bearing based on the failure analysis
    Engineering Failure Analysis, 2013
    Co-Authors: Zhiqiang Huang, Shuang Jing, Yi Zhou, Yongtao Fan
    Abstract:

    Abstract The roller Cone Bit is one of the most important rock breaking tools used in the oil–gas drilling industry. Its performance directly influences the drilling quality, efficiency and cost. As the world’s oil–gas resource exploration continuously developed, the drilling speed accelerated, accelerating the failure speed of the bearing. The roller Cone Bit’s service life was almost directly dependent on that of the bearing. In this paper, a bearing failure analysis, and an experimental research on the surface strengthening technology of the bearing with field applications etc. were carried out. The results showed that the bearing’s main failure modes included fracture, plastic deformation and wear. The main reasons were overload and uneven distribution of the load; elevated temperature due to friction caused property and structure change in material; wear increased the fit clearance between the bearing and the Cone, increasing dynamic impact load etc. The bearing surface strengthening technology, employing plasma-arc surfacing DH-60 wear resistance alloy, could prolong the service life of the bearing. Experimental research and field tests showed that the wear and impact resistance of the enhanced bearing increased by 30% with an increased service life of 12% on average.

Alfazazi Dourfaye - One of the best experts on this subject based on the ideXlab platform.

  • Wear mechanisms of WC–Co drill Bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
    International Journal of Refractory Metals and Hard Materials, 2015
    Co-Authors: Malik Yahiaoui, Jean-yves Paris, Jean Denape, Alfazazi Dourfaye
    Abstract:

    The tribological behavior of commercial roller Cone Bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.

Yi Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Finite-element analysis and structure optimization of X-O composite seal of Cone Bit:
    Advances in Mechanical Engineering, 2020
    Co-Authors: Shuang Jing, Yi Zhou, Ling Xie
    Abstract:

    The seal is the key part of the Cone Bit. To reduce the failure probability, a new seal was designed and studied. The sealing performance and structure optimization of the X-O composite seal was an...

  • Newly structured design and finite element analysis of bionic nonsmooth surface sealing ring of Cone Bit
    Advances in Mechanical Engineering, 2018
    Co-Authors: Yi Zhou, Yinghuan Liu
    Abstract:

    The seal is a critical component of a Cone Bit, whose performance can be reduced because of its large contact area. To reduce stress within the seal, a bionic nonsmooth surface seal was designed an...

  • Cone Bit bearing seal failure analysis based on the finite element analysis
    Engineering Failure Analysis, 2014
    Co-Authors: Yi Zhou, Zhiqiang Huang, Li Tan, Chengsong Qiu, Fuxiao Zhang, Yuan Yuan, Chunmei Sun, Guo Liang
    Abstract:

    Abstract Failure analysis of Cone Bit bearing seals is important in reducing production cost and preventing in-service component failure. However, a generally accepted criterion for their failure has not yet been established because of complexities in both their material properties and the environment. In this study, a two-dimensional axisymmetric finite element analysis (FEA) numerical model was established. FEA software was developed based on the Mooney–Rivlin constitutive model of the rubber material, and the penalty function contact algorithm. The distributions of stress, strain and contact pressure were analyzed to establish their effect on failure. The locations and causes of the failure and preventive measures were determined by comparison with an actual failure case. It was found that stress concentration and uneven pressure distribution occur at the seal. Rubber rings are highly and unequally compressed. Metal ring structure mainly determines sealing performance. To reduce the occurrence of failure, the structure must be improved by: designing an appropriate angle-tapered metal ring end face structure instead of a plane to change the trend in pressure distribution, increasing the contact area of the metal ring end face to reduce contact pressure and make the contact pressure distribution more uniform to reduce sealing surface wear, reducing the radial thickness to reduce the compression of the rubber ring, and improving back support structures to reduce the stress concentration. Results from the study can prevent and minimize risk for future failures to increase Bit life and reduce drilling costs.

  • experimental research on the surface strengthening technology of roller Cone Bit bearing based on the failure analysis
    Engineering Failure Analysis, 2013
    Co-Authors: Zhiqiang Huang, Shuang Jing, Yi Zhou, Qin Li, Wengang Hu
    Abstract:

    Abstract The roller Cone Bit is one of the most important rock breaking tools used in the oil–gas drilling industry. Its performance directly influences the drilling quality, efficiency and cost. As the world’s oil–gas resource exploration continuously developed, the drilling speed accelerated, accelerating the failure speed of the bearing. The roller Cone Bit’s service life was almost directly dependent on that of the bearing. In this paper, a bearing failure analysis, and an experimental research on the surface strengthening technology of the bearing with field applications etc. were carried out. The results showed that the bearing’s main failure modes included fracture, plastic deformation and wear. The main reasons were overload and uneven distribution of the load; elevated temperature due to friction caused property and structure change in material; wear increased the fit clearance between the bearing and the Cone, increasing dynamic impact load etc. The bearing surface strengthening technology, employing plasma-arc surfacing DH-60 wear resistance alloy, could prolong the service life of the bearing. Experimental research and field tests showed that the wear and impact resistance of the enhanced bearing increased by 30% with an increased service life of 12% on average.

  • Experimental research on the surface strengthening technology of roller Cone Bit bearing based on the failure analysis
    Engineering Failure Analysis, 2013
    Co-Authors: Zhiqiang Huang, Shuang Jing, Yi Zhou, Yongtao Fan
    Abstract:

    Abstract The roller Cone Bit is one of the most important rock breaking tools used in the oil–gas drilling industry. Its performance directly influences the drilling quality, efficiency and cost. As the world’s oil–gas resource exploration continuously developed, the drilling speed accelerated, accelerating the failure speed of the bearing. The roller Cone Bit’s service life was almost directly dependent on that of the bearing. In this paper, a bearing failure analysis, and an experimental research on the surface strengthening technology of the bearing with field applications etc. were carried out. The results showed that the bearing’s main failure modes included fracture, plastic deformation and wear. The main reasons were overload and uneven distribution of the load; elevated temperature due to friction caused property and structure change in material; wear increased the fit clearance between the bearing and the Cone, increasing dynamic impact load etc. The bearing surface strengthening technology, employing plasma-arc surfacing DH-60 wear resistance alloy, could prolong the service life of the bearing. Experimental research and field tests showed that the wear and impact resistance of the enhanced bearing increased by 30% with an increased service life of 12% on average.