Abstract：In order to solve the pumpburning problem of screw pump wells, extend pump inspection cycle, and improve economic benefits, based on automobile sliding theory, heat generation rate model and unsteady temperature field model of rotor were established and solved with volumecontrol heat balance method. Pressurized heating up model was built according to the first law of thermodynamics. Stator temperature distribution in axial direction and fluid temperature distribution were determined through iterative calculation, and the distribution laws under different outlet pressure and production gas oil ratio were analyzed. The results show that because of interference fit and relative motion between stator and rotor, the rotor′s section temperature field is divided into high temperature zone and low temperature zone; an obvious spiral damage belt along axial direction has been found; the stator′s highest section temperature distributes in axial direction and internal fluid temperature distribution, dominated by inner pressure distribution, are divided into two stages and shift towards suction as the outlet pressure increases. The increase of production gas oil ratio weakens convective heat transfer between stator′s inwall and internal fluid, changes its physical property parameters, which accordingly causes the elevation of stator temperature and fluid temperature. Its effect on temperature field change is mainly on pump outlet.
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