Abstract
With selecting lower-convected Maxwell constitutive equation, polymer solution flow equation in eccentric annulus is established. And the distribution rule of the force acting on the sucker rod by polymer solution has been gained. The result shows the eccentric ratio and the movement velocity of the sucker rod are major influence factors on the radial force. The greater the ratio is, the greater the force of sucker rod is. Then the eccentric wear is easier to appear.
Highlights
With the development of the enhanced oil recovery technology, Polymer flooding has been widely used
Because of the viscous-elasticity of polyer flooding produced fluid, there would be a radial force acting on the sucker rod, which was vertical to axis
The phenomenon of eccentric wear will be heavier and rupture of sucker rod will always happen, which has become the major problem in Polymer flooding Wells production
Summary
With the development of the enhanced oil recovery technology, Polymer flooding has been widely used. Because of the viscous-elasticity of polyer flooding produced fluid, there would be a radial force acting on the sucker rod, which was vertical to axis. It has practical significance to carry out the study of viscous-elastic fluid in eccentric annulus. Before there is few study about radial force due to the viscous-elasticity of polymer flooding produced fluid. On the base of the steady flow velocity profile in the viscous-elastic fluid in eccentric annulus with the internal rod moving axially, the lower-convected Maxwell constitutive equation model is used, the stress distribution of the flow field and the radial force acting on the sucker rod are calculated, the influence factors of radial force and eccentric wear of sucker rod are analyzed, which provides theoretical basis for the prevention of eccentric wear.
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