The Experts below are selected from a list of 192 Experts worldwide ranked by ideXlab platform

Han Xiuqing - One of the best experts on this subject based on the ideXlab platform.

  • Structural design method on elastic-plastic of oil Perforating Guns
    2010 International Conference on Computer Mechatronics Control and Electronic Engineering, 2010
    Co-Authors: Dong Xiaogang, Cao Shan, Cao Lina, Han Xiuqing
    Abstract:

    A structural design method on elastic-plastic strength analysis of Perforating Guns of oil and gas wells was developed in this paper. The current engineering Finite Element Method (FEM) software was used for the analysis. Gun 102 (with 102mm OD), made of alloy steel 30CrMo double-treated with 8mm wall thickness was chosen to analyze actually with this method. Considerable plastic deformation accumulates during normal working load. And the plastic deformation still continues till the load drops to some level lower than the maximum after the maximum load, which is shown by the plastic deformation history diagram. It is feasible to design the thickness of the wall of the Perforating Gun based on this structural design method by elastic-plastic analysis. As a result, reducing accidents of seizing-up Gun can come true.

  • Dynamic numerical simulation of detonation wave of Perforating bullet and research of its measuring method
    2010 International Conference on Computer Mechatronics Control and Electronic Engineering, 2010
    Co-Authors: Cao Shan, Cao Lina, Zou Kuancheng, Cao Yuxin, Han Xiuqing
    Abstract:

    Dynamic numerical simulation of the spreading of detonation wave was made by use of the explicit dynamic finite element analysis program. The results of numerical simulation are in agreement with physical phenomena and laws of spreading of detonation wave. The study indicates that the calculation model and simulation method are reasonable and feasible. The volume of electronic sensor both at home and abroad is so large that it is difficult to arrange sensing elements in Perforating Gun. As a result, three-dimensional wave can't be measured. So we approximately substitute the relationship between the mean Gun pressure and time. Taking advantage of this measuring method, Gun pressure of other styles can be estimated. This is a very valuable method, and may be used for reference to manufacture and scientific research of Perforating Gun.

  • Structural optimal design method for Perforating Guns based on computational intelligence
    Oil Drilling & Production Technology, 2009
    Co-Authors: Han Xiuqing
    Abstract:

    This paper first analyzed the frame structure of oil Perforating Gun with finite element method. Then a non -linear map-ping function was constructed within BP neural networks from maximum stress at blind hole to blind hole depth and diameter calculated. The objective function values used for solving the structural optimization problems with genetic algorithm were obtained, modified genetic algorithm was used to optimize Perforating Gun structure. The results show that application of this optimal technology based on neural networks and genetic algorithm to Perforating Gun structural design is effective and reasonable. The technology provides a new thought and method for solving those optimization problems existing in complex structure with multi-variables especially when the optimization object can hardly be explicitly expressed as the function of design variables.

Zhang Yong-guang - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Simulation of the Shaped Charge Jet Formation and Penetration through the Wall of Perforating Gun
    Science Technology and Engineering, 2009
    Co-Authors: Zhang Yong-guang
    Abstract:

    Numerical simulation of the shaped charge jet formation process and penetration through the wall of Perforating Gun are made by use of the explicit dynamic finite element analysis program.And the results of numerical simulation are discussed.The distribution character of the parameter,which is called height of burst,is analysed.The results of numerical simulation are agreement with physical phenomena and laws of jet formation and penetration.The study indicates that the calculation model and simulation method are reasonable and feasible,so can be applied to the optimizing design for shaped charge jet,which may be used for reference to manufacture and scientific research of Perforating bullet.

Zhu Ming-jie - One of the best experts on this subject based on the ideXlab platform.

  • Structural Optimization Design of the Body of Oil Perforating Gun
    Science Technology and Engineering, 2011
    Co-Authors: Zhu Ming-jie
    Abstract:

    In order to obtain the minimal thickness of Gun body in the condition of meeting the requirement,oil Perforating Gun structure optimization designs for the depth,diameter of blind hole and the thickness of the Gun body were conducted based on the parametric design language(APDL) of ANSYS.On the basis of the conclusion,the influence of the depth and diameter of blind hole on the Gun body strength was studied.The result shows that changes of blind hole depth have a great impact on the strength of oil Perforating Gun,whereas the variety of diameter has lesser influence.

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

  • Effects of high pressure strength of rock material on penetration by shaped charge jet
    2012
    Co-Authors: Hongfa Huang
    Abstract:

    Perforating of oil/gas well creates communication tunnel between reservoir and wellbore. Shaped charges are widely used as perforators in oilfield industry. The liners of the charges are mostly made of powder metal to prevent solid slug clogging the entrance hole of well casing or locking the hole in Perforating Gun. High speed jet from the shaped charge pierces through Perforating Gun, well fluid, well casing, and then penetrates into reservoir formation. Prediction of jet penetration in reservoir rock is critical in modeling of well production. An analytical penetration model developed for solid rod by Tate and Alekseevskii is applied in this work. For better results, strength of formation rock at high pressure needs to be measured. Lateral stress gauge measurements in plate impact tests are conducted. Piezoelectric pressure gauges are imbedded in samples to measure the longitudinal and transverse stress simultaneously. The two stresses provide Hugoniot and material compressive strength. Indiana limesto...

Zhang Hong-wu - One of the best experts on this subject based on the ideXlab platform.

  • On Perforating Gun Design and Perforating Process Based on SPH Method
    Well Logging Technology, 2011
    Co-Authors: Zhang Hong-wu
    Abstract:

    SPH method is used to simulate the Perforating processes,and the perforation in high velocities is simulated.The maximum flash heights of the blind holes are calculated in different efflux velocities,the perforation diameter of the blind holes are calculated in different efflux velocities and different blind holes depths and the flash heights in different materials.It is demonstrated that the heights of the flashes are decreased and the perforation diameters of the Perforating Gun are firstly increased and then decreased with the increase of the efflux velocity.A fitting formula is given to describe the relationship between perforation diameter and efflux velocity. The perforation diameters of the Perforating Gun increase with the decrease of the blind holes depth.The toughness of 40CrNiMo is higher than 45 steel,which leads to the fact that the flash heights and the perforation diameters in case of 40CrNiMo are lower.

  • Numerical simulation of the perforation process and the parameter controls of the Perforating Gun
    Journal of Plasticity Engineering, 2008
    Co-Authors: Zhang Hong-wu
    Abstract:

    Finite element method was used to simulate the perforation process of the perforation Gun.The effects of the parameters on the formations of the flashes and the shape of formed hole were studied.Results indicate that the heights of the flashes can be reduced and the shape of the formed holes can become smoother with the increase of the efflux velocity,the radii of the blind holes and the depth of the blind holes,which can be beneficial to the properties of the perforation Guns.The heights of the flashes and the shape of the formed holes can be also affected by the ductility of the materials of the perforation Guns.Before the Gun pressure can reach 100MPa,the curves of the Gun pressure-maximum stress are very similar for the tube wall with one hole and the tube with all the holes formed.But after 100MPa,the load carrying ability of the tube wall with one hole becomes higher than the one with all the holes formed.