The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform
Xinbing Zhong - One of the best experts on this subject based on the ideXlab platform.
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research on the properties of inside surface of subsurface Pump Barrel by n c o multi elements penetrating
Surface & Coatings Technology, 2007Co-Authors: Hai Zhou, Fei Chen, Bin Yao, Xinbing ZhongAbstract:Abstract Subsurface Pump usually requires good properties of anti-wear and corrosion resistant because it works in a very bad environment. The performance of the oil-well Pump can be distinguishingly improved by intensifying the surface of Pump Barrel. This paper study the properties of the inside surface of subsurface Pump Barrel by N–C–O multi-elements penetrating. The modified layer, which is composed of bright layer and transition layer, obtained a thickness of 70 μm at 670 °C, 3 h. The microhardness of the modified layer attains 700 HV. The tribological behavior of the modified layer under dry sliding against steel was evaluated on a ring-on-block test rig. The surface-modified layer showed good friction-reducing and fair anti-wear abilities. Electrochemical corrosion experiment shows that the modified layer further improved the corrosion resistance of Pump Barrel.
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Research on the properties of inside surface of subsurface Pump Barrel by N–C–O multi-elements penetrating
Surface & Coatings Technology, 2006Co-Authors: Hai Zhou, Fei Chen, Bin Yao, Xinbing ZhongAbstract:Abstract Subsurface Pump usually requires good properties of anti-wear and corrosion resistant because it works in a very bad environment. The performance of the oil-well Pump can be distinguishingly improved by intensifying the surface of Pump Barrel. This paper study the properties of the inside surface of subsurface Pump Barrel by N–C–O multi-elements penetrating. The modified layer, which is composed of bright layer and transition layer, obtained a thickness of 70 μm at 670 °C, 3 h. The microhardness of the modified layer attains 700 HV. The tribological behavior of the modified layer under dry sliding against steel was evaluated on a ring-on-block test rig. The surface-modified layer showed good friction-reducing and fair anti-wear abilities. Electrochemical corrosion experiment shows that the modified layer further improved the corrosion resistance of Pump Barrel.
Weiwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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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.
Sama Vagapov - One of the best experts on this subject based on the ideXlab platform.
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Lateral Buckling of Pump Barrel and Rod String Stability in Pumping Wells
2019Co-Authors: Sama VagapovAbstract:p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Times New Roman'; min-height: 15.0px} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px 'Times New Roman'} span.s1 {font: 12.0px 'Times New Roman'} table.t1 {border-collapse: collapse} td.td1 {padding: 0.0px 5.0px 0.0px 5.0px} It is our view that the influence of a fluid column inside the tubing on the design of a sucker rod Pumping system could be far greater than previously thought. The fluid column inside the tubing is an active participant in the buckling behavior not only the tubing, but also the buckling behavior of the rod string and the Pump Barrel. Using such an approach one may discover quite unexpected phenomena. The column of fluid inside the tubing exerts a buckling effect on the Barrel for the tubing Pump and the top anchor rod Pump. If the pressure is large enough, the straight form of equilibrium becomes unstable and the Pump Barrel buckles and straightens in succession during the Pumping cycle. During Pump upstroke the Pump Barrel, tubing and rod string are buckled simultaneously in most instances. If the Pump is installed in the deep wells with low fluid levels, the designer will need to be alert to buckling behavior of Pump Barrel. We must consider the Barrel buckling phenomenon for the determination of the maximum allowable Pump setting depth. The column of fluid inside the tubing exerts a straightening effect on the Barrel for the bottom anchor rod Pumps. During Pump upstroke the tubing and the rod string are buckled simultaneously, but the Pump Barrel remains straight. The straightening effect of pressure results in an increase the ability of the Pump Barrel to resist bending and keeps the Barrel in straight position. Probably the straightening effect of the pressure reduces the plunger-Barrel frictional force. The bottom location of seating assembly allows us to not only prevent the Barrel buckling but also use the pressure as a way to increase the ability of the Pump Barrel to resist bending. The straightening effect of pressure adds another argument supporting the use of the bottom anchor rod Pump in deep wells. During Pump upstroke, the column of fluid inside the tubing increases the rod string stability in two ways: first, the weight of the fluid column exerts a real tensile force and second, the pressure exerts a fictitious tensile force. The fictitious tensile force does not exist when the rod string is straight. The axial tension due to fictitious tensile force will be developed in rod string when the rod string is disturbed from its straight position. We must take into account this phenomenon in the analysis of the buckling behavior of the tubing and the rod string in Pumping well. This different point of view will enable us to improve understanding the role of the fluid column in rod Pumping system and explain the rod Pump failures in a different way.
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Buckling of Pump Barrel and Rod String Stability in Pumping Wells
2016Co-Authors: Sama VagapovAbstract:In this paper, the phenomenon of buckling of a Pump Barrel is explained. For the tubing and the top anchor rod Pumps, both the Pump Barrel and the tubing string are buckled during Pump upstroke. The Pump Barrel will buckle and much more severely in comparison with the tubing string. Possibly the buckling of the Pump Barrel hastens Pump wear. The buckling of the Barrel can accelerate wear of the top of the plunger. For the bottom anchor rod Pumps, the Pump Barrel increases the stability in the straight position during Pump upstroke. The possibility that the straightening effect can reduce friction and wear of the plunger during Pump upstroke is suggested. In some instances, where the crude oil is highly viscous, both the Pump Barrel and the bottom rods will buckle during Pump downstroke. In these cases, the tubing Pumps and top anchor rod Pumps have the advantage over the bottom anchor rod Pumps. In the design of sucker rod Pumps it must consider the stability of Pump Barrel. Accurate analysis of buckling is important because the buckling of the Barrel generates bending stresses. The change in thickness may lead to local buckling of the Barrel. In the design of sucker rod Pumps the Pump Barrel should also be checked for local buckling. According to Newton's third law, for an upward fictitious force applied to the tubing there is a downward reaction force applied to the rod string. The reaction force exerts a straightening effect which resists rod string buckling.
Hai Zhou - One of the best experts on this subject based on the ideXlab platform.
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research on the properties of inside surface of subsurface Pump Barrel by n c o multi elements penetrating
Surface & Coatings Technology, 2007Co-Authors: Hai Zhou, Fei Chen, Bin Yao, Xinbing ZhongAbstract:Abstract Subsurface Pump usually requires good properties of anti-wear and corrosion resistant because it works in a very bad environment. The performance of the oil-well Pump can be distinguishingly improved by intensifying the surface of Pump Barrel. This paper study the properties of the inside surface of subsurface Pump Barrel by N–C–O multi-elements penetrating. The modified layer, which is composed of bright layer and transition layer, obtained a thickness of 70 μm at 670 °C, 3 h. The microhardness of the modified layer attains 700 HV. The tribological behavior of the modified layer under dry sliding against steel was evaluated on a ring-on-block test rig. The surface-modified layer showed good friction-reducing and fair anti-wear abilities. Electrochemical corrosion experiment shows that the modified layer further improved the corrosion resistance of Pump Barrel.
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Research on the properties of inside surface of subsurface Pump Barrel by N–C–O multi-elements penetrating
Surface & Coatings Technology, 2006Co-Authors: Hai Zhou, Fei Chen, Bin Yao, Xinbing ZhongAbstract:Abstract Subsurface Pump usually requires good properties of anti-wear and corrosion resistant because it works in a very bad environment. The performance of the oil-well Pump can be distinguishingly improved by intensifying the surface of Pump Barrel. This paper study the properties of the inside surface of subsurface Pump Barrel by N–C–O multi-elements penetrating. The modified layer, which is composed of bright layer and transition layer, obtained a thickness of 70 μm at 670 °C, 3 h. The microhardness of the modified layer attains 700 HV. The tribological behavior of the modified layer under dry sliding against steel was evaluated on a ring-on-block test rig. The surface-modified layer showed good friction-reducing and fair anti-wear abilities. Electrochemical corrosion experiment shows that the modified layer further improved the corrosion resistance of Pump Barrel.
Xiurong Sun - One of the best experts on this subject based on the ideXlab platform.
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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.
