DIAGNOSES OF DOWNHOLE WORKING CONDITIONS OF SUCKER ROD PUMPS IN DIRETIONAL WELLS

Based on the dynamics principle,differential equations of longitudinal vibfation of rod string and boundary conditions for dynamical analysis of sucker rod pumping system in directional well have been established by tuking account of well trajectory,construction of rod string,friction force between rod string and tubing,and viscous force of well fluid etc. in this paper. The said models are solved by finite difference method and the revelant computer software is worked out. This technique is applied in the 5th production department of Daqing oilfield.