The friction and wear properties of the nylon coating,prepared by hot-extrusion, used to protect the surface of the flexible continuous sucker rod were studied by using a pin-on-disc wear tester in the simulated oil w...The friction and wear properties of the nylon coating,prepared by hot-extrusion, used to protect the surface of the flexible continuous sucker rod were studied by using a pin-on-disc wear tester in the simulated oil well environment.The effects of sliding speed and load were considered.The wear mechanism was also studied by using a scanning electron microscope (SEM).The result shows that the friction coefficients of both kinds of materials,JKPA and ZZ7024B,used to protect the surface of the flexible continuous sucker rod decrease with sliding speed increase,but change little with load increase in the simulated oil well environment.The value of friction coefficient of ZZ7024B is smaller than that of JKPA.The minimum value of friction coefficient of ZZ7024B is about 0.05.The wear volume of ZZ7024B is smaller than that of JKPA under the same conditions of experimentation.展开更多
The transient response to longitudinal impact of flexible rods with Hertz contact is closely related to the extent of deformations with different impact parameters. By means of LS-DYNA, for different radius and differ...The transient response to longitudinal impact of flexible rods with Hertz contact is closely related to the extent of deformations with different impact parameters. By means of LS-DYNA, for different radius and different speeds, the longitudinal impact of a hammer with a rounded end on a drill rod is numerically simulated in this article. Simulations demonstrate that there is an obvious dif-ference between analytical solution and numerical solution on condition of short curvature radius. In the circumstance contact pressure increases, the boundary of the yield zone exceeds that of the contact zone, and the significant plastic deformation reduces the intensity of contact pressure pulse. Contact force-time curves in loading and unloading phases shift down. The numerical solution is in good agree-ment with analytical solution on condition of large curvature radius and impact speeds. The deforma-tion of yield region is constrained by the surrounding elastic region and no significant plastic deforma-tion appears.展开更多
基金FundedbyKeyScientificandTechnologicalProjectofWuhan (No .9910 0 2 0 36G)
文摘The friction and wear properties of the nylon coating,prepared by hot-extrusion, used to protect the surface of the flexible continuous sucker rod were studied by using a pin-on-disc wear tester in the simulated oil well environment.The effects of sliding speed and load were considered.The wear mechanism was also studied by using a scanning electron microscope (SEM).The result shows that the friction coefficients of both kinds of materials,JKPA and ZZ7024B,used to protect the surface of the flexible continuous sucker rod decrease with sliding speed increase,but change little with load increase in the simulated oil well environment.The value of friction coefficient of ZZ7024B is smaller than that of JKPA.The minimum value of friction coefficient of ZZ7024B is about 0.05.The wear volume of ZZ7024B is smaller than that of JKPA under the same conditions of experimentation.
基金supported by the National Natural Science Foundation of China (No. 50475056)
文摘The transient response to longitudinal impact of flexible rods with Hertz contact is closely related to the extent of deformations with different impact parameters. By means of LS-DYNA, for different radius and different speeds, the longitudinal impact of a hammer with a rounded end on a drill rod is numerically simulated in this article. Simulations demonstrate that there is an obvious dif-ference between analytical solution and numerical solution on condition of short curvature radius. In the circumstance contact pressure increases, the boundary of the yield zone exceeds that of the contact zone, and the significant plastic deformation reduces the intensity of contact pressure pulse. Contact force-time curves in loading and unloading phases shift down. The numerical solution is in good agree-ment with analytical solution on condition of large curvature radius and impact speeds. The deforma-tion of yield region is constrained by the surrounding elastic region and no significant plastic deforma-tion appears.
