Stability Analysis And Deformation Simulation Of Sucker Rod

Sucker rod deformation failure accelerated the down-hole equipment damage, it not only increased the number of work-over operations, but also caused a series of engineering problems, become one of the main reasons for oilfield operations, and it has caused severe economic losses for oil development, so that it caused the universal attention by each big oilfield. At present, many scholars think one of the failure reasons is attributed to rod bending deflection, and they put forward the viewpoint that put the centralizer in a reasonable place in order to prevent the rod deformation.Based on the vertical and horizontal bending theory, analyzed the loading and deformation of sucker rod, having proved the deformation and bending mechanical mode of sucker rod was vertical and horizontal bending continuous beam in this paper. In the handling of mode, not only considered the moment but also the support reaction, the additional friction (the friction of steady) and the influence of additional bending stress to the deformation of sucker rod. To simplify the resolution of the solution of mechanical model, premier taken the simple beam model to parse the deformation and load of sucker rod, then used continuous beam model to correct the deformation behavior of sucker rod, basing on the theory of vertically and horizontally bending. By analyzing has ascertained the actual deformation shape of sucker rod in the oil pipe and the centralizer spacing, which provide a theoretical evidence basis for locating centralizer reasonably. For ease of actual operation, on the basis of theoretical analysis, using Visual Basic 6.0 development environment composing the corresponding calculation software, this software interface is simple, the operation is convenient. Using the software calculation results to determine rod deformation and the installation position of centralizer, can avoid the construction blindness, fully realize the theoretical analysis engineering and have practical value.Because of the sucker rod deformation process involves various nonlinear problems, in order to verify the correctness of the program, to proceed from finite deformation theory and finite element method, the paper calculated the sucker rod on a nonlinear finite element analysis, and use ANSYS simulation the deformation of sucker rod, the simulated results are consistent with program calculation, consequently it validated the correctness and feasibility of the program calculation.