Abstract:In order to study the contact wear of stator bushing of conventional progressive cavity pump (PCP) in heavy oil extraction,the variation of friction coefficient of nitrile butadiene rubber(NBR) for stator in the high temperature and sandcontaining crude oil under different speed and load was studied by friction and wear test.The experimental results show that the friction coefficient of NBR for stator is increased firstly and then decreased as the number of revolutions increases,and then remains almost unchanged.However,the friction coefficient is decreased firstly and then increased with the increasing of the normal load.Based on the friction coefficient measured by experiment,the contact analysis of progressive cavity pump’s stator and rotor was carried out by finite element method to study the influence of friction coefficient,interference and working pressure difference on the wear of stator bushing.The results show that the shear strain of the stator bushing is increased with the increasing of friction coefficient,interference and working pressure difference.The displacement is decreased with the increasing of friction coefficient while increases with the increasing of interference.The working differential pressure not only affects the wear of stator bushing inner wall contact position,but also aggravates the adhesive wear of stator bushing outer wall.