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Since the 1986 introduction of Daqing Oilfield screw has experienced the introduction , digestion and absorption, self-development in three stages , so far, ground drive rod screw pump technology has matured facilities, becoming the beam pumping unit and latent after the main oil pump artificial lift methods , but also in polymer flooding , ASP flooding and heavy oil wells showed good adaptability. Compared with other artificial lift methods , screw low investment , low energy consumption , adaptability and other advantages of the media in the field of high maturity tapping the potential synergies increasingly prominent role . However, with the polymer , three wells have been put into test area by between blocks produced fluid property differences such as crude oil composition , viscosity and other factors , screw the stator rubber mechanical properties change is also increasing differences especially rubber swelling characteristics change , the decision between the stator and rotor screw pump final amount of interference in water flooding , polymer flooding , three drive there are differences between blocks a configuration of the stator and rotor interference has been difficult to meet the different blocks lifting needs, in particular in: sucker rod bearing torque increases , poles running increased fatigue , frequent sucker rod broken off ; rotor increased wear on the rubber , leakage increases, shortening the life of the pump ; stator and rotor type line meshing deteriorated , screw lifting capacity decreased, can not meet the development needs. In response to these problems , we propose a \optimal allocation of surplus quantity , to meet the different needs of development block lifting .
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