The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Shimin Dong - One of the best experts on this subject based on the ideXlab platform.
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Spatial Transverse Vibration Simulation Model of Axially Moving Sucker Rod String under the Excitation of Curved Borehole
Shock and Vibration, 2020Co-Authors: Hongbo Wang, Shimin DongAbstract:The mechanical model of transverse vibration of Sucker Rod String (SRS) in directional well is simplified to the transverse vibration model of longitudinal and transverse curved beam with initial bending under borehole constraints. In this paper, besides considering the excitation of alternating axial load on the transverse vibration of SRS, it is proposed for the first time that curved borehole is also the main excitation for the transverse vibration when the SRS moves reciprocating axially in the borehole. Based on the elastic body vibration theory, the transverse vibration mathematical model of SRS with initial bending under borehole constraints is established. In this model, the curved borehole excitation caused by the axial motion and the alternating axial load excitation is considered. Besides, the elastic collision theory is applied to describe the constraint of tube on the SRS transverse vibration in this model. Then the fourth-order Runge–Kutta method is used to calculate the transverse vibration of SRS in directional wells. The simulation results show the following: (1) The simulation results of the three simulation models in this paper are different. The results indicate that the curved borehole excitation caused by the axial motion and the alternating axial load excitation is the main excitation for the SRS transverse vibration. (2) In directional wells, the Rod and tube contact along the well depth, and the dangerous sections locate at the deviation section of the borehole and the compression section of the Rod. On the whole, the contact force between Rod and tube in deviation section of borehole is larger. The transverse vibration of the compression section of the Rod is the most violent.
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The numerical simulation of entire Sucker Rod String buckling with couplings in vertical wells
Cluster Computing, 2018Co-Authors: Xiurong Sun, Shimin Dong, Weiwei ZhangAbstract:A new model is built to study the buckling of a Rod String with couplings in the vertical well considering two important loads: the axial distribution load along the Rod and the concentrated load at the bottom. Firstly, the calculation method for the axial distribution load of the Sucker Rod String is established based on a wave equation of longitudinal vibration. And, the simulation results show that the axial distribution load of Sucker Rod String has an obvious non-uniform distribution characteristic. The friction force between the plunger and the pump barrel (FFPPB), which is an important part of the concentrated load at the bottom, is improved based on both the Newtonian fluid (NF) and the non-Newtonian power law fluid (NNPLF) by using the Flunent software. In view of the above improvement of the computational method, a simulation model of the entire Rod String buckling with couplings is established. Under the assumption that the coupling is taken as a radial constraint boundary, the two-point boundary value problem (BVP) algorithm is used to solve the differential equation, and the least square method is used to establish the continuity conditions on the supporting point of coupling. The simulation results show that the eccentric state of the plunger (eccentricity ratio \(\upvarepsilon =0\sim 1\)) has a significant influence on the eccentric wear area between the Rod-tubings, which should be taken into account in the practical calculation. And compared without couplings, the contact pressure between the Sucker Rod String and the tubing is transferred to the couplings, which fits the engineering reality. Further, the simulation result implies the centralizers should be installed firstly near the couplings in order to protect the couplings better. The new method lays the theoretical foundation for the further studying the Rod wear life and the design of the eccentric wear prevention.
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Dynamic simulation and efficiency analysis of beam pumping system
Journal of Central South University, 2015Co-Authors: Mingming Xing, Shimin Dong, Zhi-xiong Tong, Ran-feng Tian, Hui-ling ChenAbstract:An improved whole model of beam pumping system was built. In the detail, for surface transmission system (STS), a new mathematical model was established considering the influence of some factors on the STS’s torsional vibration, such as the time variation characteristic of equivalent stiffness of belt and equivalent rotational inertia of crank. For the Sucker Rod String (SRS), an improved mathematical model was built considering the influence of some parameters on the SRS’s longitudinal vibration, such as the nonlinear friction of plunger, hydraulic loss of pump and clearance leakage. The dynamic response and system efficiency of whole system were analyzed. The results show that there is a jumping phenomenon in the amplitude frequency curve, and the system efficiency is sensitive to motor power, pump diameter, stroke number, ratio of gas and oil, and submergence depth. The simulation results have important significance for improving the efficiency of beam pumping system.
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An improved longitudinal vibration model and dynamic characteristic of Sucker Rod String
Journal of Vibroengineering, 2014Co-Authors: Mingming Xing, Shimin DongAbstract:Considering the influence of the nonlinear characteristics of plunger load and the friction of Sucker Rod String (SRS) on the SRS’s longitudinal vibration, an improved simulation model of SRS’s longitudinal vibration is derived. In the details, based on the flow characteristic of non-Newtonian power law fluid (NNPLF), a velocity model of NNPLF between pump plunger and pump barrel is established. Then the law of the velocity distribution is solved out with Lagrange multiplier method. Therefore, with the law of the velocity distribution of NNPLF, the computing models of nonlinear friction of pump plunger and clearance leakage between pump plunger and barrel are derived. Taking account of the influence of some parameters on the plunger load, such as plunger friction, hydraulic loss of pump and clearance leakage, an improved simulation model of plunger load is derived. The dynamic response is solved out with fourth order Runge-Kutta method. Comparing experiment results with simulated results, good agreement is found, which shows the simulation model is feasible. The influences of the different parameters on pump pressure and pump plunger load are analyzed, such as stroke number, power law exponent, consistency coefficient and gap between plunger and pump barrel. Simulation result indicates that the opening time of standing valve and traveling valve is affected by the parameters, and the maximum and minimum loads of pump plunger are affected by stroke number. In addition, the influence of SRS absorber on SRS’s longitudinal vibration is analyzed.
Mingming Xing - One of the best experts on this subject based on the ideXlab platform.
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Simulation Analysis of Nonlinear Friction of Rod String in Sucker Rod Pumping System
Journal of Computational and Nonlinear Dynamics, 2019Co-Authors: Mingming Xing, Lili Zhou, Chengmao Zhang, Kaifeng Xue, Zhiyu ZhangAbstract:The nonlinear friction of Rod String is an important foundation of dynamic simulation and efficiency optimization in Sucker Rod pumping system (SRPS). As we know, there are geometrical nonlinearity and contact nonlinearity of Rod String in special oil well. Considering the earlier practical problems, a novel computational method of nonlinear friction of Rod String is given. First, the simulation model of nonlinear friction is built. In the detail, the nonlinear friction of Sucker Rod String is made up of four parts: the viscous damping friction of Rod surface, the viscous damping friction of Rod coupling, liquid friction of centralizer, and the nonlinear Coulomb friction between Rod and tube. Second, considering the rheology property of multiphase fluid in annular space, a simulation method of fluid pressure is proposed with software ansys. Based on earlier models, a numerical simulation model of nonlinear friction of Rod String is built with visualbasic 6.0. Comparing experiment results with simulated results, good agreement is found, which shows the simulation model is feasible. The characteristics of fluid pressure and pressure gradient are analyzed. The instantaneous friction of Rod String is simulated, and the sensitive factors of Rod friction are analyzed. The novel simulation method solves the problem of environmental load calculation of large deformation Rod. The analysis results have an important significance to guidance of optimization and design of SRPS.
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Simulation Analysis of Resonant Frequency of Mix Sucker Rod with absorber
IOP Conference Series: Materials Science and Engineering, 2017Co-Authors: Mingming Xing, Lili Zhou, Xue KaifengAbstract:Considering the influence of Sucker Rod absorber (SRA) on longitudinal vibration of Sucker Rod String (SRS), a new model of mix Sucker Rod with absorber (MSRWA) in the form of numerical integration is built. In the detail, based on the dynamical theory of continuous systems, the wave equation of instantaneous motion of MSRWA is deduced. The dynamic response is solved out with the mode superposition method. The affecting factors of natural frequency are analyzed, such as the length, diameter, density and elastic modulus of SRS. Then three dimensional curves of natural frequency are obtained. The results are very important for the design and application of SRS.
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Response analysis of longitudinal vibration of Sucker Rod String considering Rod buckling
Advances in Engineering Software, 2016Co-Authors: Mingming XingAbstract:The nonlinear longitudinal vibration model of buckling SRS is presented and studied.The numerical integral model of nonlinear and time-varying system for pump is studied.The whole analytical model of SRPS is derived to solve the stable response directly.The relationship between equivalent stiffness and Rod buckling is analyzed. Considering the limitation of simulation model of the deep well and ultra-deep well, an improved simulation model of Sucker Rod pumping system (SRPS) is presented. The main innovations of the simulation model are nonlinear longitudinal vibration model of Sucker Rod String (SRS) and numerical integral model of nonlinear system with pump time varying parameters. In the detail, the relationship of Rod buckling and plunger load is analyzed using a finite element preprocessor module of ANSYS. Based on analysis results and experimental results, the change rule of equivalent stiffness is studied. Using parameters of oil well, the response of longitudinal vibration of SRS is analyzed. The new model is verified by comparing it with the available analytical solution, and good agreement is found. The simulation results show that the instantaneous equivalent stiffness of helical buckling section of SRS follows exponential distribution. The equivalent stiffness is affected by some parameters, among them, the values of water cut, density of crude oil and pump depth have a significant effect. With new model presented in this paper, the subharmonic resonance is found, which is characteristic of nonlinear vibration. Comparing with the steel Rod, carbon fiber Rod and fiberglass Rod, the resonant phenomenon of single Rod is more likely to happen for the wire rope Sucker Rod. However, when Sucker Rod is double stage Rod, the resonant phenomenon of fiberglass Rod is more likely to happen than other Rods. The above results are significant to the optimization of SRS.
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Dynamic simulation and efficiency analysis of beam pumping system
Journal of Central South University, 2015Co-Authors: Mingming Xing, Shimin Dong, Zhi-xiong Tong, Ran-feng Tian, Hui-ling ChenAbstract:An improved whole model of beam pumping system was built. In the detail, for surface transmission system (STS), a new mathematical model was established considering the influence of some factors on the STS’s torsional vibration, such as the time variation characteristic of equivalent stiffness of belt and equivalent rotational inertia of crank. For the Sucker Rod String (SRS), an improved mathematical model was built considering the influence of some parameters on the SRS’s longitudinal vibration, such as the nonlinear friction of plunger, hydraulic loss of pump and clearance leakage. The dynamic response and system efficiency of whole system were analyzed. The results show that there is a jumping phenomenon in the amplitude frequency curve, and the system efficiency is sensitive to motor power, pump diameter, stroke number, ratio of gas and oil, and submergence depth. The simulation results have important significance for improving the efficiency of beam pumping system.
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An improved longitudinal vibration model and dynamic characteristic of Sucker Rod String
Journal of Vibroengineering, 2014Co-Authors: Mingming Xing, Shimin DongAbstract:Considering the influence of the nonlinear characteristics of plunger load and the friction of Sucker Rod String (SRS) on the SRS’s longitudinal vibration, an improved simulation model of SRS’s longitudinal vibration is derived. In the details, based on the flow characteristic of non-Newtonian power law fluid (NNPLF), a velocity model of NNPLF between pump plunger and pump barrel is established. Then the law of the velocity distribution is solved out with Lagrange multiplier method. Therefore, with the law of the velocity distribution of NNPLF, the computing models of nonlinear friction of pump plunger and clearance leakage between pump plunger and barrel are derived. Taking account of the influence of some parameters on the plunger load, such as plunger friction, hydraulic loss of pump and clearance leakage, an improved simulation model of plunger load is derived. The dynamic response is solved out with fourth order Runge-Kutta method. Comparing experiment results with simulated results, good agreement is found, which shows the simulation model is feasible. The influences of the different parameters on pump pressure and pump plunger load are analyzed, such as stroke number, power law exponent, consistency coefficient and gap between plunger and pump barrel. Simulation result indicates that the opening time of standing valve and traveling valve is affected by the parameters, and the maximum and minimum loads of pump plunger are affected by stroke number. In addition, the influence of SRS absorber on SRS’s longitudinal vibration is analyzed.
Jiang Yang - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Model of Rotary Sucker Rod String and Its Finite Difference Equation
Journal of Xi'an Petroleum Institute, 2000Co-Authors: Jiang YangAbstract:In this paper was established the twisting dynamic model of the rotary Sucker Rod String,which is used for driving downhole screw pump in a vertical well.A kind of finite difference equation of the model was also given.Because the continuous conditions of the torsion moment and torsion angle at the connects of the Sucker Rod String,and Taylor expansion of the torsion angle were used in the establish ment of the model,the difference equation can be used for the combined Sucker Rod Strings of different material.Adding some definite conditions,the model and its difference equation can be used in the optimization design,behavoir prediction,working condition diagnosis and strength checking of the Sucker Rod String combination.
Yu Guang-hai - One of the best experts on this subject based on the ideXlab platform.
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Vibration Testing Analysis and Behavior Diagnose of Screw Pump Wells
Oil Field Equipment, 2009Co-Authors: Yu Guang-haiAbstract:To satisfy the requirement of ISO2372 equipment vibration criterion to avoid resonance,the vibration testing and analysis program of screw pump wells were developed by means of visual basic based on original calculation of Sucker Rod String frequencies and field test data.Through testing and analysis of 21 screw pump wells in Shengli Oil,the developed program was effective with friendly interface and was easy to use.
Deng Fu-cheng - One of the best experts on this subject based on the ideXlab platform.
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Analysis of Sucker Rod & String Fatigue Failure on Heat Treatment Factor
Oil Field Equipment, 2009Co-Authors: Deng Fu-chengAbstract:Via different types of Sucker Rod String failure data statistics,it was found that heat treatment was one of the early brittle fracture fatigue failure.In order to study the failure mechanism,an oil pRoduction plant vitiated Sucker Rod String was given as an example,in which external thread join was rupture.After checking the strength,its structure met the normal requirements.Through observing the fracture topographic image in macroscopy and microscopy two angles,as well as using the hardness analysis and the metallographic examination with the broken Rod,the basic reason was found,which lead to the Sucker Rod String rift overheated in the heat treatment.Thus it affected the distribution of the crystalline particle,reduced toughness and plasticity of the Rod,increased its brittleness,made the fatigue crack occurrence on the roots of the outside thread because of stress concentration,then created the brittleness fatigued failure owing to the fatigue crack rapidly expanded.
